JP4296200B2 - Hot water system - Google Patents

Description

  The present invention relates to a hot water supply system that heats water into hot water and supplies the hot water to a hot water supply destination that requires the hot water, and in particular, circulates the working fluid while heating and cooling it to work the working fluid that holds thermal energy. Combined with a power cycle that obtains power by performing power generation, the power for power generation is taken out in the power cycle using the temperature difference between the heat source used to heat the water and the water before heating, and at the same time heat exchange with the working fluid The present invention also relates to a hot water supply system that can also effectively use the generated heat without waste by heating water.

  Gas fuels such as natural gas and propane gas (hereinafter abbreviated as gas) are widely used as fuels that are excellent in ignitability and flammability and have a well-prepared supply system. Hot water supply systems that heat and supply hot water are widely used in ordinary homes as instantaneous water heaters and bath water heaters. In recent years, a cogeneration system that obtains electric power and heat by effectively using the energy of a gas has been proposed for homes as well as heating gas by burning gas.

  As a cogeneration system for homes using gas, there is a system that generates electricity with a gas engine and obtains hot water using engine exhaust heat during power generation, or a fuel cell that uses gas reforming as fuel to generate power. A system that obtains hot water by exhaust heat from a battery is common.

  Among such conventional cogeneration systems, an example using a gas engine is described in Japanese Patent Application Laid-Open No. 2002-304927, and an example using a fuel cell is disclosed in Japanese Patent Application Laid-Open No. 11-223385. Some are listed.

These conventional cogeneration systems can not only use the power obtained by power generation, but also supply hot water and heat by using the exhaust heat of the power generation part for heating water for hot water supply and heating. The heat generated from the house is effectively used to reduce the energy consumption in the entire house and to reduce the environmental load.
JP 2002-304927 A JP-A-11-223385

  The conventional cogeneration system has a configuration shown in each of the above-mentioned patent documents, and when used for residential use, it is required to support downsizing and frequent heat use in the house. In the system using the gas engine shown in Fig. 1, it is extremely difficult to enter a power load following operation state or to divert the generated surplus power to another. Since the system operation period in one day is shortened and exhaust heat is not generated at the same time as stopping the engine, other heat sources such as an auxiliary boiler are used together when heat is required for water heating etc. In other words, it was difficult to increase the energy saving effect.

  On the other hand, the system using the gas-reformed fuel type fuel cell disclosed in Patent Document 2 can change the thermoelectric ratio to some extent in accordance with power load fluctuations, and can keep the system in an operating state for a long time. Therefore, other heat sources such as an auxiliary boiler corresponding to the heat demand at the peak time are indispensable, and there is a problem that the cost when introduced together with the fuel cell itself and the reformer is extremely high.

  In addition, in any conventional system, the proportion of heat output generated as exhaust heat at the same time when a predetermined power generation output is obtained is not so large, and the system's total power demand amount of each power load at home is used as a reference. Even if the power generation output is determined, an auxiliary boiler that supplements the heat output is required because the total heat demand at the peak of various heat loads such as hot water supply and heating in the house cannot be handled only by the exhaust heat of the power generation unit. However, the power generation efficiency of the entire system considering the heat output from the auxiliary boiler is naturally low because the auxiliary boiler is not involved in power generation, and it has a remarkable advantage compared to the case of using commercial power It had the problem of being difficult to say.

  In addition, in any conventional system, heat output can be obtained efficiently only during steady operation of the power generation unit, and the power generation unit cannot generate surplus power. However, in order to reliably and efficiently obtain the heat output together with the electric power, the power generation unit must be set to the maximum power generation output lower than the power requirement amount at the time of the maximum power consumption in the house. In this case, as a result, it is impossible to meet the power requirement at the peak time, so the introduction of commercial power becomes indispensable, and there is a problem that the effects of energy saving and environmental load reduction are not actually great.

  The present invention has been made to solve the above-mentioned problems. The power cycle is operated with the heat of the generated combustion gas, and the power is extracted with the extracted power, and water for hot water supply is used as a low-temperature heat source for the power cycle. It is an object of the present invention to provide a hot water supply system that can secure sufficient hot water supply capacity and can effectively use heat generated from fuel to reduce both energy consumption and environmental load.

A hot water supply system according to the present invention includes a heat source unit that heats water with heat held by a combustion gas of a predetermined fuel, hot water obtained by the heat source unit is supplied to a hot water supply destination, and water is supplied from the water supply source to the heat source unit. In a hot water supply system including at least a conduit for guiding, a heater that heats a predetermined working fluid, an expander that introduces at least a part of the working fluid and converts thermal energy held by the fluid into power, and the expansion A power cycle mechanism section comprising at least a cooler that cools the working fluid exiting the machine, and a compressor that sends the working fluid exiting the cooler to the heater, and the power obtained by the expander A generator that performs power generation, a heat generation amount in the heat source unit and an operation state of the power cycle mechanism unit, and a control unit that controls a hot water supply state according to a request status of electric power and hot water, the heat source unit, Generated And at least a portion of the heat in a working fluid heat exchanger for heating the working fluid, while the Ru also serves as a heater of the power cycle mechanism, it has a latent heat recovery heat exchanger unit, the power The cooler of the cycle mechanism unit is configured to be able to flow in and out water supplied from the water supply source through the pipe as at least one cooling medium that exchanges heat with the working fluid . If there is a demand for power generation output and it is expected that the heat demand of the heat load will exceed the minimum value of the heat release in the cooler when the power cycle mechanism is operated, the power cycle mechanism is In an operating state, water from a water supply source is first introduced into the latent heat recovery heat exchanger and heated .
As described above, according to the present invention, heat generated in the heat source unit is used as a high-temperature heat source for a power cycle, and heat is converted into power to generate power, while water for hot water supply is used as a low-temperature heat source for the power cycle. Then, the heat fluid is exchanged with the working fluid in the cooler, the exhaust heat of the power cycle is recovered by heating the water, and by realizing the cycle operation, it is possible to supply power in addition to hot water supply. It can cover a part of the power demand in the country, generate enough heat while generating electricity, the thermoelectric ratio is appropriate for general power demand and heat demand, and the heat output to be generated The maximum value is sufficiently large, heat generation related to power generation can sufficiently meet heat demand, heat generation not related to power generation can be suppressed, the power generation efficiency of the entire system can be improved, and energy saving and environmental load reduction are ensured. To do Can. Moreover, water heating can also be performed in the heat source section, sufficient heat can be given to the water for hot water supply, and a high hot water supply capacity can be ensured to meet various hot water supply demands.

In addition, the hot water supply system according to the present invention is branched from a predetermined position of the working fluid flow path between the heat source unit and the expander, if necessary, to a predetermined position of the working fluid flow path between the expander and the cooler. A bypass flow path that merges and a branch position of the bypass flow path in the working fluid flow path between the heat source unit and the expander, to the expander close flow path and bypass flow path of the heat source close flow path and a flow path switching valve which allows changing the ratio between the amount toward via the cooler the amount and bypass channel toward the expander side of the adjustment to the working fluid to the degree of communication, the control unit , depending on the heat demand from the power demand or the thermal load from the power load, also the in which you adjust controlling the flow switching valve.

  As described above, according to the present invention, the power cycle mechanism unit is provided with the bypass flow path serving as a working fluid flow path that does not pass through the expander, and each communication state between the expander side and the bypass flow path side of the upstream flow path is set. A flow path switching valve to be adjusted and a control section for operating and controlling the flow path switching valve are arranged. The flow path switching valve is adjusted by the control section, and the amount of the working fluid directed to the expander is directly passed to the cooler through the bypass flow path. By controlling the ratio with the amount of heading, the amount of working fluid toward the expander can be changed to adjust the power obtained by the expander and the power generation amount of the generator based on this power. The amount of heat released from the working fluid in the cooler changes by changing the ratio of the working fluid and the working fluid that has maintained heat without going through the expander. Control the flow path switching valve, The balance of the heat output at the generator output and the cooler of the electrical machine can be adjusted for optimum operation. Furthermore, the generator can be placed in a load following operation state, and in addition to greatly increasing the operating rate of the power generation part, even if the maximum power output of the generator is substantially matched to the peak power requirement at the point of use Therefore, it is possible to operate the system without generating surplus power, increase the amount of power generated by the system, reduce the dependence on commercial power, and effectively reduce the energy cost and environmental load.

  Further, in the hot water supply system according to the present invention, if necessary, the pipe line is connected between the main pipe line from the cooler through the heat source part to the hot water supply destination, and the cooler and the heat source part in the main pipe line. A branch pipe that branches from a predetermined position and merges with the main pipe at a predetermined position on the hot water supply side from the heat source section, and is disposed at a branch position between the main pipe and the branch pipe so that a portion near the cooler of the main pipe is When there is a water supply switching valve for switching between the portion close to the heat source part of the main pipe line and the branch pipe, and the control part has a water temperature at the outlet of the cooler reaching a predetermined set temperature related to hot water supply The control is performed so that the water supply switching valve is in a communication state between the cooler outlet and the branch line side, and when the temperature is not reached, the water supply switching valve is in a communication state between the cooler outlet and the heat source side. It is.

  As described above, according to the present invention, a main pipe that passes through the heat source section and a branch pipe that does not pass through the heat pipe are set in the pipe, and water is supplied by the water supply switching valve according to the water temperature at the cooler outlet. If the amount of heat that makes the water sufficiently warm with the cooler can be given by switching to which of the heat source, the direct from the cooler to the hot water supply destination without passing through the heat source regardless of the heat generation state in the heat source. Hot water can be fed, and hot water can be efficiently supplied while preventing heat loss and flow path loss in the pipe and heat source section from the cooler to the heat source section.

  Further, in the hot water supply system according to the present invention, if necessary, the working fluid is a non-azeotropic mixed medium having a lower boiling point than water, and the working fluid heat exchange unit of the heat source unit and the expansion of the power cycle mechanism unit A gas-liquid separator for separating the vapor-phase working fluid and the liquid-phase working fluid evaporated in the working fluid heat exchange section is disposed in the working fluid flow path between the machine and the gas-liquid separator. A branch channel is provided for directing the liquid phase working fluid to the cooler.

  As described above, according to the present invention, a non-azeotropic mixed medium in which a gas-liquid phase change occurs even at a temperature lower than water is used as a working fluid, and the gas phase component and the liquid phase component are separated on the upstream side of the expander. A gas-liquid separator is provided, and the gas-phase working fluid separated by the gas-liquid separator is directly introduced into the expander and the liquid-phase working fluid is allowed to flow into the cooler without passing through the expander. Both the gas phase working fluid exiting the expander and the liquid phase working fluid exiting the gas-liquid separator are allowed to exchange heat with water in the cooler, so Even if the temperature difference is small, the power cycle can be operated, the heating temperature of the working fluid in the heat source part can be kept low, and the amount of heat input to the working fluid heat exchange part can be reduced to reduce the energy consumption related to power generation. In addition to reducing the heat energy generated in the heat source, It is possible to increase the ratio of amount to be used as can the appropriate corresponding to the actual usage of the thermoelectric ratio.

  Further, in the hot water supply system according to the present invention, if necessary, the heat source unit positions the water heating part at a part where the high temperature combustion gas reaches, and the part where the low temperature combustion gas reaches from the water heating part. The working fluid heat exchanging part is located.

  As described above, according to the present invention, the working fluid heat exchanging portion is disposed at a portion where the combustion gas having a temperature lower than the water heating portion in the heat source portion reaches, and the heat source portion exchanges heat between the high-temperature combustion gas and water. By exchanging heat between the lower-temperature combustion gas and the working fluid, sufficient heat can be given to the water to ensure hot water supply capacity, while causing a phase change even at a low temperature, and a change in flow rate. Thermal energy can be effectively used as a necessary and sufficient heating state without applying excessive heat to almost no working fluid, and the operation of the power cycle can be stabilized. In addition, the heat resistance of the working fluid heat exchange part can be relaxed, and the cost of the heat source part can be reduced.

Further, in the hot water supply system according to the present invention, when the power cycle mechanism unit is in an operating state after the water from the water supply source is first introduced into the latent heat recovery heat exchange unit and heated as necessary. When the power cycle mechanism is not activated, it is passed through the branch line that bypasses the cooler when the power cycle mechanism is not operated. Without being introduced into the water heating part of the heat source part, it is heated.

  As described above, according to the present invention, the heat exchange part for recovering the latent heat of the combustion gas is disposed in the heat source part, and the water is preheated and warmed by the latent heat recovery heat exchange part and further heated by a cooler or the like. In order to make the most of the thermal energy held by the combustion gas, the temperature rise in the latent heat recovery, the water heating part of the cooler and / or heat source part in order to make the water reach the set temperature suitable for hot water supply The amount of heat applied can be reduced, and wasteful energy consumption can be suppressed to further reduce energy costs and environmental loads.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an example of a hot water supply system for a house using so-called city gas (natural gas) as a fuel and using a non-azeotropic mixed medium as a working fluid will be described. 1 is a schematic system diagram of a hot water supply system according to the present embodiment, FIG. 2 is a schematic configuration diagram of a heat source unit in the hot water supply system according to the present embodiment, and FIG. 3 is a flowchart of hot water supply start control in the hot water supply system according to the present embodiment. FIG. 4 is a flowchart of hot water supply continuation availability control and hot water supply state adjustment control in the hot water supply system according to this embodiment, FIG. 5 is a flowchart of power generation start control in the hot water supply system according to this embodiment, and FIG. 6 is in the hot water supply system according to this embodiment. FIG. 7 is a flowchart of power generation output control, and FIG. 7 is a flowchart of power generation continuity control in the hot water supply system according to this embodiment.

  In each of the drawings, the hot water supply system 1 according to the present embodiment obtains power for power generation by a heat source section 10 that generates heat by burning gas and a phase change of the working fluid heated by the heat source section 10. A power cycle mechanism section 20, a power generator 30 that generates power using the power generated by the power cycle mechanism section 20, a conduit 40 that guides water from a water supply source to each section and supplies hot water to a hot water supply destination, It is the structure provided with the control part 50 which controls the heat generation amount in the heat source part 10, the operation state of the power cycle mechanism part 20, and the hot water supply state according to the request | requirement condition of electric power or hot water supply.

  The heat source unit 10 heats the working fluid with a part or all of the heat generated by burning the gas in the burner 13 separately from the water heating unit 11 composed of a pipe group through which water passes and a heat receiving body around the pipe. The working fluid heat exchanging section 12 is evaporated and serves also as a heater (evaporator) of the power cycle mechanism section 20. The water heating unit 11 is a known structure capable of heating water with combustion gas as a heat exchange unit for general hot water supply, and the working fluid heat exchange unit 12 is also a known heat exchanger. The combustion gas is circulated through one channel and the working fluid is circulated through the other channel to exchange heat, and detailed description of each component is omitted.

  The water heating unit 11 has a water-side flow path connected to the pipe line 40, and has a structure in which water is introduced through the pipe line 40 to heat it and send it as hot water. On the other hand, the working fluid heat exchange unit 12 is configured to communicate the working fluid side flow path with the outlet of the pump 24 of the power cycle mechanism unit 20 and the inlet of the gas-liquid separator 21.

  The working fluid heated by heat exchange with the combustion gas in the working fluid heat exchanging section 12 is a non-azeotropic mixed medium (for example, a mixed fluid of water and ammonia), and is heated and partially evaporated. A gas phase component in which the low-boiling component occupies most and a liquid phase component in which the high-boiling component occupies most are mixed.

  And with respect to the working fluid heat exchange part 12, the temperature on the surface of the water heating part 11 is determined by the combustion gas flow path setting in the heat source part 10, the positional relationship with the burner 13, and the combustion state (thermal power) setting of the burner 13. Combustion gas at a lower temperature is in contact with it, and it operates while ensuring appropriate heating capacity for working fluids of non-azeotropic mixed media that can cause a phase change even with a small temperature difference. It is a mechanism that does not heat the fluid excessively. When water is not passed through the water heating unit 11 by the heat source unit 10, combustion of the burner 13 is suppressed by adjusting the number of burner operations and the size of the flame, or the combustion gas flow path in the heat source unit 10 is changed. The configuration is such that a high temperature combustion gas is prevented from directly reaching the working fluid heat exchanging section 12 from the burner 13 to obtain a temperature state suitable for heating the working fluid in the working fluid heat exchanging section 12.

  The power cycle mechanism unit 20 includes a gas-liquid separator 21 that separates the working fluid heated by the heat source unit 10 into a gas-liquid and liquid-phase component at a high temperature and a gas-liquid mixed phase, and a gas-phase operation. A turbine 22 as an expander that operates by a fluid, a condenser 23 as the cooler that condenses the gas-phase working fluid exiting the turbine 22 to form a liquid phase, and the working fluid exited from the condenser 23 The pump 24 serving as the compressor is sent to the heat source unit 10 at a predetermined supply pressure, and the vapor phase working fluid is directed to the turbine 22 on the front side of the turbine 22 and to the condenser 23 through the bypass passage 25. It is a structure provided with the flow-path switching valve 26 which determines the ratio of minutes. Among these, the gas-liquid separator 21, the turbine 22, and the pump 24 are known devices similar to those used in a power cycle using a general non-azeotropic mixed medium as a working fluid, and description thereof is omitted. . In addition, as an expander of this power cycle mechanism part 20, not only the turbine 22 but a screw type expander, a positive displacement expander, etc. can also be used.

  In the condenser 23, the working fluid circulates in one of the gaps separated through the internal heat transfer section, the water as the cooling medium circulates in the other gap, and the working fluid passes through the heat transfer section. It is a known heat exchanger configuration in which water performs heat exchange, and detailed description thereof is omitted. In the condenser 23, a high-temperature liquid-phase working fluid separated from the gas-phase component by the gas-liquid separator 21 and the branch flow path 27 is simultaneously introduced together with the gas-phase working fluid that has passed through the turbine 22 and / or the bypass passage 25. Is done. Among these, the ratio of the amount of gas working fluid passing through the turbine 22 and the amount passing through the bypass passage 25 varies depending on the conditions such as power generation and heat output, so that the amount of heat released from the condenser also changes. The water temperature at the vessel outlet varies greatly. On the other hand, after the liquid-phase working fluid exits the gas-liquid separator 21, the pressure is adjusted via the pressure reducing valve 28 disposed in the branch flow path 27, and then introduced into the condenser 30. It is.

  In addition, since the exhaust heat of the power cycle mechanism unit 20 released by the condenser 23 is sufficiently large, a configuration in which a plurality of heat exchange portions are provided and a plurality of cooling media that exchange heat with the working fluid can be used. In addition to water for hot water supply, other heat medium such as brine for heating also exchanges heat with the working fluid, effectively using exhaust heat when water heating cannot be used and increasing the power cycle operating rate. Can be improved. On the contrary, even if the amount of heat released from the working fluid by the condenser 23 in a state where the power cycle mechanism unit 20 operates becomes the minimum value that can be taken in the adjustable range, the amount of heat required from the heat load such as hot water supply is reduced. If the value is even smaller, the heat cycle mechanism 20 will not operate normally due to hindrance to heat dissipation from the condenser 23, so that the forced air cooling type that cools the working fluid separately from the condenser 23 The system 50 is configured to stop the power cycle mechanism 10 by stopping heat exchange between the combustion gas and the working fluid in the working fluid heat exchange unit 12 of the heat source unit 10.

The flow path switching valve 26 is disposed in a flow path between the gas-liquid separator 21 and the turbine 22 in the power cycle mechanism unit 20, and is a flow path toward the turbine 22 with respect to the upstream flow path from the flow path switching valve 26. And the communication state of the bypass flow path 25 are adjusted, and the ratio of the working fluid passing through each of the turbine 22 side flow path and the bypass flow path 25 is changed. The bypass flow path 25 is a branch flow path that branches from the flow path from the gas-liquid separator 21 to the turbine 22 at the position of the flow path switching valve 26 and joins the flow path between the turbine 22 and the condenser 23. .
The generator 30 is a known device that generates power by being rotationally driven by a connected turbine 22 and will not be described.

  In the pipe 40, the downstream portion after the condenser 23 is connected to the upstream portion from the water supply source to the condenser 23, and the downstream portion after the condenser 23 passes through the heat source unit 10 to supply hot water such as a hot water supply curan or hot water storage tank. And a branch line 42 branched from a predetermined position between the condenser 23 and the heat source unit 10 in the main line 41 and joined to the main line 41 at a predetermined position on the hot water supply side from the heat source unit 10. It is the composition which becomes. At the branch position of the main pipeline 41 and the branch pipeline 42, a water supply switching valve 43 that switches between the portion near the condenser 23 of the main pipeline 41 and the portion near the heat source 10 of the main pipeline 41 and the branch pipeline 42 is arranged. Established. In addition, as the water supply source, a water supply source that can supply water at a predetermined pressure, such as a water supply, is used. However, the water supply source is not limited to this, and a pump similar to that used in a general hot water supply device is used in combination. Supply pressure may be applied, and in that case, water from a supply source having no supply pressure or a small supply pressure may be used.

  The control unit 50 controls the heat source unit 10, the flow path switching valve 26, the water supply switching valve 43, the generator 30, and the like according to the power request amount from the load side and the heat request amount related to hot water supply. . In particular, by operating the flow path switching valve 26 in the operating state of the power cycle mechanism section 20, the condenser 23 directly passes through the flow rate of the gas-phase working fluid toward the turbine 22 in the power cycle mechanism section 20 and the bypass flow path 25. Thus, the ratio of the flow rate toward the engine can be adjusted and controlled, and the power generation output of the generator 30 driven by the turbine 22 can be controlled. In addition, the state in which the water (warm water) exiting the condenser 23 passes through the heat source section 10 and the heat source section by switching control between the branch line 42 side communication state and the heat source section 10 side communication state at the outlet of the condenser 23 by the water supply switching valve 43. It is possible to switch the state directly toward the hot water supply destination without passing through 10. However, the control unit 50, when the heat demand from the heat load such as hot water supply is less than the minimum value in the adjustable range of the amount of heat released from the working fluid in the condenser 23 in the operating state of the power cycle mechanism unit 20, Heat exchange between the combustion gas and the working fluid in the working fluid heat exchange unit 12 of the heat source unit 10 is not performed, the power cycle mechanism unit 20 is stopped, and the feed water switching valve 43 is connected to the outlet of the condenser 23 and the heat source unit 10. The heat corresponding to the amount of heat required is generated in the heat source unit 10 while being in communication with the side.

  The control information of the control unit 50 includes the opening degree of the flow path switching valve 26 to each flow path and the switching state of the water supply switching valve 43, as well as a conventional hot water supply apparatus and a power generator using a power cycle. 23 inlet water temperature, outlet water temperature, heat source section outlet water temperature, turbine rotation speed (generator output frequency), generator output voltage, gas flow rate adjustment valve opening degree of heat source section 10 (degree of burner heating power level), air quantity adjustment section open The degree or the like is detected and input to the control unit 50.

  The control unit 50 has two control modes of power supply priority and hot water supply priority in the control when the heat output in the condenser 23 is insufficient with respect to the required heat amount. On the other hand, if the hot water supply is given priority by the auxiliary heating in the section 10, the amount of working fluid toward the turbine 22 is reduced and the heat output in the condenser 23 is increased, so that the heat output corresponding to the heat requirement amount can be obtained in the entire system. It is a mechanism to secure.

  Next, the operation of the hot water supply system according to the present embodiment will be described. As a premise, it is assumed that water can be introduced into the system at a sufficient flow rate for a hot water supply request from a water supply source having sufficient water supply pressure such as water supply. The water introduced from this water supply source is introduced into the condenser 23 of the power cycle mechanism unit 20.

  On the other hand, the heat source unit 10 burns fuel gas to generate high-temperature combustion gas. This combustion gas is sent only to the water heating unit 11 when the power cycle mechanism unit 20 is not operated due to the heat demand, and the power cycle mechanism unit 20 is operated and only the heat output in the condenser 23 is supplied. In the case where the heat requirement can be accommodated, only the working fluid heat exchange section 12 is sent. When the power cycle mechanism unit 20 is operated and water is passed through the water heating unit 11, the combustion gas is sent to both the water heating unit 11 and the working fluid heat exchange unit 12.

  When the combustion gas is sent to the working fluid heat exchange unit 12 of the heat source unit 10, the working fluid heat exchange unit 12 exchanges heat between the combustion gas and the working fluid to heat the working fluid. Since water for hot water supply is introduced as a cooling medium for cooling the working fluid, the power cycle mechanism unit 20 can perform a cycle operation.

  Specifically, in the working fluid heat exchanging unit 12 as a heater in the heat source unit 10, the combustion gas obtained by gas combustion as the high-temperature heat source and the all-liquid working fluid exchange heat. A part of the working fluid heated by this heat exchange evaporates as the temperature rises and enters a gas-liquid mixed phase state. This mixed phase high-temperature working fluid goes out of the heat source unit 10 and reaches the gas-liquid separator 21.

  The working fluid is divided into a gas phase component and a liquid phase component in the gas-liquid separator 21, and the gas-phase working fluid exiting the gas-liquid separator 21 reaches the flow path switching valve 26, and the flow path switching valve 26 is adjusted. A part is directed to the turbine 22 in proportion to the degree, and the other is directed directly to the condenser 23 through the bypass flow path 25. The liquid-phase working fluid enters the branch channel 27 from the gas-liquid separator 21 and is introduced into the condenser 23 via the pressure reducing valve 28.

  When the gas-phase working fluid reaches the turbine 22, the turbine 22 is operated, and the generator 22 is driven by the turbine 22 to convert the heat energy into usable electric power. The gas-phase working fluid that has performed work in the turbine 22 in this manner is in a state where the pressure and temperature are lowered, and after exiting the turbine 22, is introduced into the condenser 23.

  In the flow path switching valve 26 controlled by the control unit 50, when the flow rate of the working fluid through the bypass flow path 25 is increased while the amount of the working fluid reaching the turbine 22 is suppressed, The generated power is reduced and the amount of power generation can be suppressed. Further, since the amount of the working fluid directly reaching the condenser 23 increases, the amount of heat exchanged between the working fluid and water in the condenser 23 increases, and accordingly, the heating amount of water increases, and the amount of hot water supply increases. It can cope with increase and hot water temperature rise.

  On the other hand, when the flow rate of the working fluid passing through the bypass passage 25 is decreased by adjusting the flow path switching valve 26 and the amount of the working fluid reaching the turbine 22 is increased, the power generated by the working fluid increases. The amount of power generation can be increased. Further, in the condenser 23, since the amount of the working fluid that reaches the condenser 23 after working in the turbine 22 increases, the amount of heat exchanged between the working fluid and water decreases accordingly. By adjusting the flow path switching valve 26 as described above, changes in the amount of power generation based on the amount of working fluid expanding in the turbine 22 and the amount of water heated due to heat exchange in the condenser 23 are caused. Can do.

  In the condenser 23, the liquid phase working fluid introduced from the gas-liquid separator 21, the gas phase working fluid exiting the turbine 22, and the gas phase working fluid passing through the bypass channel 25 are mixed. As the whole working fluid is cooled by exchanging heat with water as a cooling medium introduced into the gap across the partition wall, the gas-phase working fluid is slightly absorbed by the liquid-phase working fluid. However, it condenses with cooling and becomes a liquid phase. The working fluid, which is in a liquid phase, is discharged from the condenser 23 to the outside and flows into the pump 24 on the rear stage side.

  The working fluid exiting the condenser 23 has the lowest temperature and pressure in the system as the working fluid in the initial state before entering the heat source unit 10, that is, the liquid-phase working fluid. This all-liquid working fluid travels toward the working fluid heat exchange unit 12 of the heat source unit 10 via the pump 24. When returning to the heat source unit 10, the processes after the heat exchange in the heat source unit 10 are repeated as described above.

  With respect to the working fluid, the water used for heat exchange in the condenser 23 is heated to a predetermined temperature by receiving heat from the working fluid. If this water is hot water that has reached a predetermined set temperature suitable for hot water supply when it exits the condenser 23, the water supply switching valve 41 is switched by the control unit 50 via the branch line 42 of the pipe 40. It will go directly to the hot water supply destination. Conversely, the amount of heat obtained by heat exchange in the condenser 23 is insufficient with respect to the required heat amount, or the power cycle mechanism unit 20 is not in operation and heat cannot be obtained from the condenser 23. When the water has not reached the set temperature, the outlet of the condenser 23 is brought into communication with the heat source section 10 by the water supply switching valve 41, and the water passes from the water supply switching valve 41 through the main pipe 41 of the pipe 40. It goes to the heat source unit 10 and is heated by heat exchange with the combustion gas in the heat source unit 10 to reach a set temperature for hot water supply, and then supplied to a hot water supply destination for use.

Subsequently, each control operation of the hot water supply system according to the present embodiment will be described with reference to the flowcharts of FIGS.
As for the control related to the start of hot water supply, first, a hot water supply command is input to the control unit 50, for example, when a hot water supply curan as a hot water supply destination is opened or when hot water is discharged from the hot water storage tank and the amount of hot water in the hot water storage tank decreases. At the same time (step 001), the control unit 50 determines whether or not a power load exists and a power generation output is requested (step 002). When there is a request for power generation output, from the inlet water temperature and flow rate of the condenser 23 to the set temperature of water rather than the amount of heat released in the condenser 23 in a state where the power cycle mechanism unit 20 is operated for power generation. It is determined whether or not it can be expected that the amount of heat required corresponding to the temperature rise will exceed (step 003). When it can be expected that the amount of heat required for hot water supply exceeds the amount of heat released from the condenser 23, the combustion operation of the burner 13 of the heat source unit 10 is started, the combustion gas is introduced into the working fluid heat exchange unit 12, and the power cycle mechanism unit By bringing 20 into an operating state, the working fluid and water exchange heat in the condenser 23 and water heating is started (step 004). Thereafter, the water temperature at the outlet of the condenser 23 is acquired (step 005), and it is determined whether or not a set temperature suitable for hot water supply has been reached (step 006). If it has reached, the water supply switching valve 43 is brought into the branch line side communication state (step 007), the hot water having an appropriate temperature is supplied to the hot water supply destination without passing through the heat source section 10, and the processing is ended.

  If the outlet water temperature of the condenser 23 does not reach the set temperature suitable for hot water supply in Step 006, the water supply switching valve 43 is brought into a state in which water is circulated to the heat source unit 10 side (Step 008). Subsequently, the water heating unit 11 of the heat source unit 10 is heated by the combustion gas (step 009), and the water passes through the water heating unit 11 and exchanges heat with the high-temperature combustion gas to become hot water. . With respect to the obtained hot water, the hot water temperature in the main pipeline 41 at the outlet of the heat source unit 10 is acquired (step 010), and it is determined whether or not a set temperature suitable for hot water supply has been reached (step 011). If the temperature has reached the set temperature, the process is terminated while maintaining the state in which hot water having an appropriate temperature is supplied to the hot water supply destination. If the set temperature has not been reached in step 011, the amount of gas burned by the burner 13 is increased, the combustion gas supply is increased, and the hot water temperature is raised (step 012). And it returns to step 010 again and repeats a process.

  If no power generation output is required in step 002, or if it is not expected in step 003 that the amount of heat required for water exceeds the amount of heat released from the condenser 23, the process proceeds to step 008.

  Following the hot water supply start control, whether the hot water supply can be continued or not, and the control related to the hot water supply state adjustment with respect to the load change takes into account the change in the amount of heat required for hot water supply, It is determined whether or not the upper limit of the range has been exceeded (step 101). If the water temperature exceeds the upper limit of the set temperature range, heat is excessively dissipated from the condenser 23. The combustion gas supply is stopped, heating of the working fluid is stopped, and the operation of the power cycle mechanism unit 20 is stopped (step 102). And the control part 50 discriminate | determines the switching state of the water supply switching valve 43 (step 103), and the temperature of the hot water in the main pipe line 41 at the heat source part 10 outlet when the hot water is directed to the heat source part 10 from the condenser 23. Is less than or equal to the upper limit of the set temperature range for hot water supply (step 104). If the temperature is below the upper limit of the set temperature range, it is further determined whether or not the temperature of the hot water is included in the set temperature range for hot water supply (step 105). If the temperature is within the set temperature range, the hot water supply is stopped when the hot water supply curan is closed or the hot water in the hot water storage tank is full, while maintaining the state where the hot water of the appropriate temperature is supplied to the hot water supply destination. It is determined whether or not a command is input to the control unit 50 (step 106). If a hot water supply stop command is input, it is subsequently determined whether or not the burner 13 of the heat source unit 10 stops gas combustion. (Step 107) If the burner 13 has stopped gas combustion, the hot water supply process is terminated. If the gas combustion state is in step 107, the gas combustion in the burner 13 is stopped (step 108), and the process is terminated. On the other hand, if the hot water supply stop command is not input in step 106, the process returns to step 101 and the subsequent processing is repeated.

If hot water is directed directly from the condenser 23 to the hot water supply destination in step 103, the water supply switching valve 43 is switched (step 109), and then the process proceeds to step 104.
If the water temperature exceeds the upper limit of the set temperature range in step 104, the combustion gas supply to the water heating unit 11 of the heat source unit 10 is reduced by a predetermined amount to weaken the heating (step 110). Thereafter, the process returns to step 104 and the process is repeated. If the outlet temperature of the heat source unit 10 falls below the set temperature range in step 105, the amount of gas burned by the burner 13 is increased, the supply of combustion gas is increased, and the hot water temperature is raised (step 111). And it returns to step 105 again and repeats a process.

  When the water temperature does not exceed the set temperature range upper limit in step 101, the control unit 50 determines the switching state of the water supply switching valve 43 (step 112), and the hot water is directed from the condenser 23 toward the heat source unit 10. Proceeds to step 104.

  If the hot water is directly directed from the condenser 23 to the hot water supply destination in step 112, it is determined whether or not the water temperature at the outlet of the condenser 23 is within the set temperature range for hot water supply (step 113). If there is, the process proceeds to step 106. If it is not within the range in step 113 and is below the lower limit of the range, it is determined whether the preset control pattern is power supply priority or hot water supply priority (step 114). Control goes to step 109.

  When hot water supply is given priority in step 114, the flow rate switching valve 26 is adjusted to reduce the flow rate of the gas-phase working fluid toward the turbine 22 by a predetermined amount (step 115). Then, it is determined again whether or not the water temperature at the outlet of the condenser 23 is within the set temperature range (step 116). If it is within the set temperature range, the routine proceeds to step 106. If the temperature falls below the set temperature range in step 116, the process returns to step 115 and the process is repeated.

  The control related to power generation is to make the operation of the power cycle mechanism unit 20 that operates the power generator 30 correspond to the change in load, and can be roughly divided into control processing for starting power generation and power demand amount of the power load. It consists of a control process for matching the outputs and a control process related to whether or not to continue power generation, including the response to changes in power load and heat load. Regarding the relationship between the power generation part and the power load, as a premise, when the power generator 30 is connected to the residential power supply path, the power generated by the power generator 30 can be output to the load side in parallel with the commercial power. It is assumed that the system is a power supply system.

  In the control relating to the start of power generation, first, after a command permitting the operation of each part related to power generation is input to the control unit 50 (step 201), it is determined whether or not a power load exists and a power generation output is requested. (Step 202) When there is a request for the power generation output, the heat demand of the heat load at that time is the amount of heat released (exhaust in the condenser 23 when the power cycle mechanism unit 20 is operated for power generation). It is determined whether or not it is expected to be equal to or greater than the minimum value of (heat amount) (step 203). When the heat demand can be expected to exceed the amount of heat released from the condenser 23, the combustion gas is introduced into the working fluid heat exchanging unit 12 of the heat source unit 10, and the power cycle mechanism unit 20 is put into an operating state. Power generation is started by operating (step 204). In the initial state, the flow rate of the working fluid into the turbine 22 is adjusted by the flow path switching valve 26 so that the power output of the generator 30 driven by the turbine 22 becomes a minimum output that can cover the power consumption of the pump 24 and the like. It is kept to the minimum necessary amount. Thereafter, when the turbine 22 is in a stable rotating state and the power output of the generator 30 reaches the minimum output, the power generator 30 is connected to the power supply path, and power can be supplied from the generator 30 to the power load side. As a state (step 205), the process is terminated.

  For the control to match the power generation output of the generator 30 with the power demand amount following the power generation start control, first, the power demand amount in the power load is detected (step 301), and the power output of the generator 30 is the load side. In step 302, it is determined whether or not the power request amount is the same. Here, when the power output of the generator 30 matches the required power amount, the processing is ended as it is, and the state is shifted to the power generation continuation enable / disable control state under the monitoring of the next power load and thermal load change. This control process is executed only when the process is shifted to this control process immediately after the start of power supply or when power generation stop is not selected through the power generation continuation enable / disable control described later. The power generation output of the machine 30 does not exceed the power demand from the load.

  If the power generation output does not match the power demand amount in step 302 and is below it, it is further determined whether or not the power generation output is less than the maximum output of the generator 30 (step 303). When the power generation output is less than the maximum output, the flow path switching valve 26 is adjusted to increase the flow rate of the gas phase working fluid toward the turbine 22 by a predetermined amount (step 304). Here, the amount of heat released from the condenser 23 decreases as the working fluid flowing into the turbine 22 increases.

  The control unit 50 determines the switching state of the water supply switching valve 43 (step 305), and acquires the temperature of the hot water at the outlet of the heat source unit 10 when the hot water is directed from the condenser 23 to the heat source unit 10 (step 305). 306), it is determined whether or not this is below the set temperature range for hot water supply (step 307). If the temperature falls below the set temperature range, the amount of gas burned by the burner 13 of the heat source unit 10 is increased, the combustion gas supply is increased, and the hot water temperature is increased (step 308). Then, the process returns to step 306 and the process is repeated. If the water temperature falls within the set temperature range in step 307, the process returns to step 301 and the subsequent processing is repeated.

If hot water is directed directly from the condenser 23 to the hot water supply destination in step 305, the water temperature at the outlet of the condenser 23 is acquired (step 309), and it is determined whether or not this is below the set temperature range for hot water supply. (Step 310). When it falls below, after switching the water supply switching valve 43 (step 311), it transfers to step 306. If the temperature does not fall below the set temperature range in step 310, the process returns to step 301 and the subsequent processing is repeated.
If the power generation output reaches the maximum output of the generator 30 in step 303, the process ends.

  The control relating to whether or not to continue power generation including the response to the load change is performed in a state where the control unit 50 monitors the change in the power load and the heat load, and the heat load from the heat load is first taken into consideration. It is determined whether the required amount is equal to or greater than the minimum value of the heat released from the condenser 23 (step 401). If the required heat amount is equal to or greater than the minimum value, then the required power amount from the power load changes. It is determined whether or not (step 402). If the power demand has changed, it is further determined whether or not the power output of the generator 30 exceeds this power demand (step 403), and if so, the flow path switching valve 26 is adjusted, The flow rate of the gas-phase working fluid toward the turbine 23 is reduced by a predetermined amount (step 404).

  Here, the amount of heat released from the condenser 23 increases as the working fluid flowing into the turbine 22 decreases. The controller 50 determines whether or not the water temperature at the outlet of the condenser 23 exceeds the set temperature range upper limit for hot water supply (step 405). When the water temperature exceeds the set temperature range upper limit, the combustion gas supply to the working fluid heat exchange unit 12 of the heat source unit 10 is stopped to stop the heating of the working fluid, the operation of the power cycle mechanism unit 20 and the power generation are stopped. (Step 406) And the flow path switching valve 26 is returned to the minimum flow rate state to the turbine side (Step 407).

  Further, the control unit 50 determines the switching state of the water supply switching valve 43 (step 408), and when the hot water is directed from the condenser 23 toward the heat source unit 10, the hot water in the main pipeline 41 at the outlet of the heat source unit 10 is determined. It is determined whether the temperature is equal to or lower than the upper limit temperature range for hot water supply (step 409). If the temperature is below the upper limit of the set temperature range, it is further determined whether or not the temperature of the hot water is included in the set temperature range for hot water supply (step 410). If the temperature is within the set temperature range, the state of supplying hot water having an appropriate temperature to the hot water supply destination is maintained, and the process related to power generation is terminated.

  If hot water is directed directly from the condenser 23 to the hot water supply destination in step 408, the water supply switching valve 43 is switched (step 411), and then the process proceeds to step 409. If the water temperature exceeds the upper limit of the set temperature range in step 409, the combustion gas supply to the water heating unit 11 of the heat source unit 10 is decreased by a predetermined amount to weaken the heating (step 412). Thereafter, the process returns to step 409 and the process is repeated. Furthermore, when the outlet temperature of the heat source unit 10 falls below the set temperature range in step 410, the amount of gas burned by the burner 13 is increased, the combustion gas supply is increased, and the hot water temperature is raised (step 413). Then, the process returns to step 410 and the process is repeated.

If the water temperature has not reached the upper limit of the appropriate temperature range in step 405, the process returns to step 403 and the subsequent processing is repeated.
When the power output of the generator 30 does not exceed the power demand amount on the load side in the step 403, after executing the control (steps 301 to 311) to match the power generation output with the power demand amount, the step Returning to 401, the subsequent processing is repeated.

  If the power load has not changed in step 402, it is further determined whether a power supply stop command is input to the control unit 50 in the middle (step 414). If a stop command is input, step 406 is performed. Migrate to If there is no supply stop command input in step 414, the process returns to step 401 and the monitoring state is repeated. On the other hand, if the required heat amount is less than the minimum value of the condenser discharge heat amount in step 401, the process proceeds to step 406.

  As described above, in the hot water supply system according to the present embodiment, heat generated in the heat source unit 10 is used as a high-temperature heat source for a power cycle, and heat is converted into power to generate power, while a low-temperature heat source for the power cycle. In order to realize the cycle operation by using the water for hot water supply to exchange heat with the working fluid in the condenser 23 and recovering the exhaust heat of the power cycle by heating the water, power is supplied in addition to the hot water supply. Can cover part of residential power demand, generate enough heat while generating power, and the thermoelectric ratio is appropriate for the electricity demand and heat demand of the house. The maximum value of the heat output to be generated is sufficiently large, heat generation related to power generation can sufficiently meet the heat demand in the house, and heat generation regardless of power generation can be suppressed to increase the power generation efficiency of the entire system. In addition, since the control unit 50 adjusts the flow path switching valve 26 to control the ratio of the amount of working fluid to the turbine 22 and the amount to the condenser 23 directly through the bypass flow path 25, In addition to being able to adjust the balance between the power generation output of the generator 30 and the heat output of the condenser 23 to the optimum state by controlling the flow path switching valve 26 according to the state of the heat load, the generator 30 is in a load following operation state. The operating rate of the power generation part can be greatly increased, the amount of power generation of the system can be increased and the dependence on commercial power can be reduced, and the energy cost and environmental load can be effectively reduced.

  In addition, although the hot-water supply system which concerns on the said embodiment has illustrated the system for housing | casing which an electric power output becomes about 3 kW or less corresponding to the electric power demand for one common house, it is not restricted to this, The same With this configuration, it is possible to construct various systems with a power output of up to 30 kW by connecting a single machine or a plurality of units, and it can be applied as a system for collective housing and business establishments so as to be able to respond to a larger power demand.

  Moreover, in the hot water supply system according to the above-described embodiment, the power output of the generator 30 is only consumed by the private power consumption mechanism part such as the pump 24 or the power load connected via the power supply path. The power cycle mechanism unit 20 is controlled so that the power output from the power generator 30 does not exceed the power demand from the power load. However, the present invention is not limited to this, and a storage battery that can be electrically connected to the power generator. Can be configured to charge the storage battery from the generator as required, even if the power output from the generator exceeds the power demand from the load, Since the surplus power can be charged to the storage battery and the power generation output can be maintained as it is, in the above embodiment, the power generation output of the generator 30 is simply controlled by adjusting the flow rate of the turbine 22 in the working fluid when surplus power is generated. If it is attempted to suppress, the heat output in the condenser 23 becomes excessive, so this cannot be done, and even in a situation where the operation of the power cycle mechanism unit 20 and the power generation must be stopped finally, the power output is reduced. The battery can be charged to the storage battery and the output to the load side can be relatively reduced, so that it is not necessary to perform control to stop power generation, and power generation can be continued for a longer time. The dependence on electric power can be reduced, and the energy cost and environmental load can be reliably reduced.

  In the hot water supply system according to the above embodiment, the condenser 23 as a cooler is configured to exchange heat with the working fluid using only water from a water supply source as a cooling medium, but is not limited thereto. A flow path for other heat medium used for heating or the like may be provided, and the other heat medium may be exchanged with the working fluid together with water by a cooler. Other heat mediums may be made to exchange heat with the combustion gas by passing through the heat source part as well as water. When other heat medium is also subjected to heat exchange, it is desirable to shift the heat exchange position in the cooler or heat source unit from that of water according to the temperature required for heating so that an appropriate temperature can be obtained. In addition, one or more coolers that exchange heat between the working fluid and water and / or other heat medium according to the amount of heat retained by the working fluid and the temperature level of the water and / or heat medium to be supplied. In the working fluid flow path, it is configured to be connected in series or in parallel with the water cooler, or a heat source part for heating other heat medium is provided separately, and heat is exchanged with the combustion gas independently of water. You can also.

  Further, in the hot water supply system according to the above embodiment, the heat source unit 10 includes both the water heating unit 11 and the working fluid heat exchange unit 12, and the combustion gas generated by the burner 13 is circulated. In addition to the above, the water heating part and the working fluid heat exchange part can also be configured to include two heat source parts that are separately accommodated together with a dedicated burner. On the other hand, the heat source part control in a situation where heat exchange is not performed is easy. It becomes. Furthermore, the fuel used in the heat source unit 10 is not limited to natural gas, and may be other gaseous fuel such as petroleum gas or hydrogen, gasoline, kerosene, etc., as long as it can generate high-temperature combustion gas by combustion. You may use liquid fuel.

  In the hot water supply system according to the embodiment, the working fluid heat exchange unit 12 of the heat source unit 10 directly converts the combustion gas generated by burning the gas fuel with the burner 13 and the working fluid directly through the heat transfer portion. However, the present invention is not limited to this, and it may be configured such that the combustion gas is once heat exchanged with a predetermined heat medium, and the working fluid is heat exchanged with the heat medium and heated. By being indirectly heated through the heat medium, the influence on the working fluid side due to a rapid temperature change on the combustion gas side can be mitigated. Further, when the heat medium is used, a heat exchanging portion between the heat medium and the working fluid may be provided outside the heat source unit 10, and a special working fluid is separated by separating the working fluid flow path from the burner flame. In addition to improving the safety when used, etc., the maintainability of the working fluid flow path portion is also improved.

  Further, in the hot water supply system according to the embodiment, the water introduced from the water supply source is configured to flow into the condenser 23 as a cooler of the power cycle mechanism unit 20 as it is. As shown in FIG. 8, the latent heat recovery heat exchanging unit 14 is disposed in the heat source unit 10 of the hot water supply system 2, and water is first passed through the latent heat recovery heat exchanging unit 14 and then circulated to the condenser 23. Since the water is preheated and warmed by the latent heat recovery heat exchanger 14 and further heated by the condenser 23 and the water heater 11 of the heat source 10, the thermal energy possessed by the combustion gas is maximized. The amount of heat given elsewhere can be reduced to reach the set temperature suitable for hot water supply by the amount of temperature rise in the latent heat recovery, and wasteful energy consumption can be suppressed. Further, when such a latent heat recovery heat exchanging section is used, a branch line and a pipe switching valve for bypassing the cooler of the power cycle mechanism section are disposed in the pipe line downstream of the latent heat recovery section so that the power cycle mechanism section operates. If it is not, the water that has passed through the heat exchanger for latent heat recovery can be guided to the branch line by the control of the pipe switching valve and directed to the heat source without passing through the cooler. The loss of heat obtained at the exchange part can be prevented.

  In the hot water supply system according to the embodiment, the liquid-phase working fluid exiting the gas-liquid separator 21 is allowed to flow into the condenser 23 to exchange heat with water. A heat exchanger that uses the liquid phase working fluid that exits the liquid separator as a heat exchange fluid on the high temperature side is separately installed, and the water that exits the condenser (hot water) or the temperature that exits the condenser or pump is low. A heat recovery may be performed by exchanging heat between the liquid phase working fluid and the high temperature liquid phase working fluid exiting the gas-liquid separator. Furthermore, the branch flow path from the gas-liquid separator is connected to the working fluid flow path between the pump and the working fluid heat exchanger, and the high-temperature liquid-phase working fluid separated from the gas phase by the gas-liquid separator is a condenser. It is also possible to recover the heat by joining the low-temperature liquid-phase working fluid that goes out of the pump to the working fluid heat exchanger, and can recover the heat appropriately with a simple structure. Therefore, the apparatus cost can be reduced.

Further, in the hot water supply system according to the embodiment, the working fluid of the power cycle mechanism unit 20 is configured to use a non-azeotropic mixed medium such as a mixed fluid of water and ammonia. Ammonia, hydrocarbon, water, CO _{2 and the} like can also be used as the working fluid. In particular, when the working fluid exchanges heat with the combustion gas of less than about 130 ° C. in the heat source section, it is preferable to use a non-azeotropic mixed medium or a single medium having a boiling point lower than that of water as the working fluid. In the case of exchanging heat with combustion gas at or above ° C, it is preferable to use water, CO ₂ or the like as the working fluid. When CO ₂ is used as the working fluid, there is no need to separate the working fluid into a gas phase component and a liquid phase component in front of the expander. Therefore, as shown in FIG. 20 can be a mechanism in which the gas-liquid separator is omitted. When this CO ₂ is used as the working fluid, the working fluid heat exchanging unit 12 needs to set the working fluid at a higher temperature than the hot water supply water. It is preferable to configure the heat source unit 10 so that combustion gas having a temperature higher than the temperature can come into contact with the working fluid heat exchange unit 12.

1 is a schematic system diagram of a hot water supply system according to an embodiment of the present invention. It is a schematic block diagram of the heat-source part in the hot water supply system which concerns on one Embodiment of this invention. It is a flowchart of the hot water supply start control in the hot water supply system which concerns on one Embodiment of this invention. It is a flowchart of hot water supply continuation propriety and hot water supply state adjustment control in the hot water supply system which concerns on one Embodiment of this invention. It is a flowchart of the electric power generation start control in the hot water supply system which concerns on one Embodiment of this invention. It is a flowchart of the electric power generation output control in the hot water supply system which concerns on one Embodiment of this invention. It is a flowchart of the electric power generation continuation permission control in the hot water supply system which concerns on one Embodiment of this invention. It is a schematic systematic diagram of the hot water supply system which concerns on other embodiment of this invention. It is a schematic system diagram of the hot water supply system according to another embodiment of the present invention.

Explanation of symbols

1, 2, 3 Hot-water supply system 10 Heat source unit 11 Water heating unit 12 Working fluid heat exchange unit 13 Burner 14 Heat exchange unit for latent heat recovery 20 Power cycle mechanism unit 21 Gas-liquid separator 22 Turbine 23 Condenser 24 Pump 25 Bypass flow path 26 passage switching valve 27 branch passage 28 pressure reducing valve 30 generator 40 pipeline 41 main pipeline 42 branch pipeline 43 water supply switching valve 50 control unit

Claims (6)

A hot water supply comprising at least a heat source part that heats water with heat held by combustion gas of a predetermined fuel, and a pipe that supplies hot water obtained by the heat source part to a hot water supply destination and guides water from the water supply source to the heat source part In the system,
A heater that heats a predetermined working fluid, an expander that introduces at least a part of the working fluid and converts thermal energy held by the fluid into power, and a cooler that cools the working fluid exiting the expander And a power cycle mechanism unit comprising at least a compressor that sends the working fluid that has exited the cooler to the heater, and a generator that generates power with the power obtained by the expander,
A control unit that controls the amount of heat generation in the heat source unit and the operating state of the power cycle mechanism unit, as well as the hot water supply state, according to the demand status of electric power and hot water
The heat source unit, a working fluid heat exchanger for heating the working fluid in at least some was generated heat, while Ru also serves as a heater of the power cycle mechanism, latent heat recovery heat exchanger unit Have
The cooler of the power cycle mechanism unit is capable of flowing in and out water supplied from the water supply source through the pipe line as at least one of cooling media for exchanging heat with the working fluid ,
When the control unit has a request for power generation output, and it is expected that the heat demand of the heat load exceeds the minimum value of the heat released in the cooler in a state where the power cycle mechanism unit is operated, Set the power cycle mechanism to the operating state,
A hot water supply system , wherein water from a water supply source is first introduced into the latent heat recovery heat exchanger and heated . In the hot water supply system according to claim 1,
A bypass flow path branched from a predetermined position of the working fluid flow path between the heat source unit and the expander, and joined to a predetermined position of the working fluid flow path between the expander and the cooler;
It is arranged at the branch position of the bypass flow path in the working fluid flow path between the heat source section and the expander, and adjusts the degree of communication between the heat source section flow path and the expander close flow path and the bypass flow path. And a flow path switching valve that can change the ratio of the amount of working fluid to the expander side and the amount to the cooler via the bypass flow path ,
Hot water supply system wherein the controller, in response to heat demand from the power demand or the thermal load from the power load, wherein the benzalkonium adjust controlling the flow switching valve. In the hot water supply system according to claim 2,
The pipe is branched from a predetermined position between the cooler and the heat source part in the main pipe from the cooler to the hot water supply destination via the heat source part, and a predetermined point on the hot water supply side from the heat source part. And a branch pipe that merges with the main pipe at a position, and is disposed at a branch position between the main pipe and the branch pipe, so that the cooler portion of the main pipe communicates with either the heat source portion of the main pipe or the branch pipe A water supply switching valve that switches between
When the water temperature at the outlet of the cooler has reached a predetermined set temperature related to hot water supply, the control unit sets the water supply switching valve in a communication state between the cooler outlet and the branch pipe side and does not reach the set temperature. In this case, the hot water supply system is characterized in that the water supply switching valve is controlled to communicate with the cooler outlet and the heat source side. In the hot water supply system according to any one of claims 1 to 3,
The working fluid is a non-azeotropic mixture medium having a lower boiling point than water;
A gas that separates the vapor-phase working fluid and the liquid-phase working fluid evaporated in the working fluid heat exchange unit into a working fluid flow path between the working fluid heat exchange unit of the heat source unit and the expander of the power cycle mechanism unit. A hot water supply system comprising a liquid separator and a branch flow path for directing a liquid phase working fluid separated by the gas-liquid separator to a cooler. In the hot water supply system according to claim 4,
The hot water supply unit is characterized in that the water heating portion is positioned at a site where the high-temperature combustion gas reaches, and the working fluid heat exchange unit is positioned at a site where the low-temperature combustion gas reaches the water heating portion. system. In the hot water supply system according to any one of claims 1 to 5 ,
When water from the water supply source is first introduced into the latent heat recovery heat exchanger and heated and then the power cycle mechanism is in operation, the water heating part of the cooler and the heat source or cooling When the power cycle mechanism is not operated, it is introduced into the water heating part of the heat source without being passed through the cooler through the branch line that bypasses the cooler. A hot water supply system characterized by

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