JP2007263451A - Water supply equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide water supply equipment, suitably heating water in a water receiving tank even in an intermediate period when the temperature of the water receiving tank becomes higher while avoiding increase in quantity of water in the water receiving tank. <P>SOLUTION: This water supply equipment includes an exhaust heat recovery and heating means K for recovering heat generated in a power generation means G and heating the water in the water receiving tank 3, wherein the exhaust heat recovery and heating means K includes a heat recovery side circulating means Kg for recovering the generated heat of the power generation means G and circulating a heat medium for exhaust heat recovery to supply heat to a buffer tank 21 storing the heat medium; and a receiving tank side circulating means Kr for circulating the water in the water receiving tank 3 to heat water in the water receiving tank 3 by heat supplied to the buffer tank 21 by the heat recovery side circulating means Kg, and the heat medium for exhaust heat recovery circulated by the heat recovery side circulating means Kg and water in the water receiving tank 3 circulated by the water receiving tank circulating means Kr is circulated in the non-mixed state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention is directed to a plurality of dwelling units included in an area or an apartment house, and a water receiving tank that stores water supplied from a water supply,
A water supply means for supplying water from the water receiving tank to each of the plurality of dwelling units through a water supply channel;
Power generation means for generating power in the region or the housing complex as a power supply target;
The present invention relates to a water supply facility provided with exhaust heat recovery heating means for recovering heat generated by the power generation means and heating the water in the water receiving tank.

Such a water supply facility stores water supplied from a water supply in a water receiving tank, and the water in the water receiving tank is supplied to a plurality of dwelling units (hereinafter referred to as supply target dwelling units) included in a region or an apartment house through a water supply channel. The power generated by the power generation means may be supplied to the area or the apartment house.
Then, the exhaust heat recovery heating means recovers the heat generated by the power generation means and heats the water in the water receiving tank so that water can be supplied that can suppress giving a feeling of cold water to the user. It has become.

  In such a water supply facility, conventionally, the exhaust heat recovery and heating means has a heat source side circulation means for circulating the exhaust heat recovery heat medium recovered from the heat generated by the power generation means through the water tank side heat exchanger, and a water reception tank. Water receiving tank water circulating means for circulating the water through the water receiving tank side heat exchanger, and in the water receiving tank side heat exchanger, the water in the water receiving tank circulated by the water receiving tank water circulating means is It was configured to heat the water in the water receiving tank by heating with a heat medium for exhaust heat recovery circulated by the heat source side circulation means (see, for example, Patent Document 1).

  Incidentally, in Patent Document 1, the power generation means is constituted by an engine-driven generator, and the heat source side circulation means includes engine side circulation means for circulating engine cooling water through the engine side heat exchanger, And a waste heat recovery circulation means for circulating the heat recovery heat medium through the engine side heat exchanger and the water receiving tank side heat exchanger. In the engine side heat exchanger, in the engine cooling water, Then, the heat medium for exhaust heat recovery is heated, and the heat medium for exhaust heat recovery is configured to heat the water in the water receiving tank in the water receiving tank side heat exchanger.

JP 2004-316974 A

  By the way, in the conventional water supply equipment, since the heat medium for exhaust heat recovery is heated against the water in the water receiving tank in the water receiving tank side heat exchanger as described above, the water receiving tank side heat exchanger is passed through. The ratio of the heating capacity of the water in the water receiving tank that flows through the water receiving tank side heat exchanger to the amount of heat stored in the heat medium for exhaust heat recovery is small, so the temperature of the water in the receiving tank that passes through the water receiving tank side heat exchanger increases. The rate increases. That is, the difference between the temperature of the water flowing into the water receiving tank side heat exchanger and the temperature of the water flowing out of the water receiving tank side heat exchanger increases.

  On the other hand, if the water in the water receiving tank is heated excessively in the water receiving tank side heat exchanger, the temperature of the water in the water receiving tank becomes higher than a comfortable temperature without a feeling of cold water, which may give the user a feeling of warm water. Moreover, the chlorine contained in the water passing through the water receiving tank side heat exchanger may be lost.

  Therefore, in the conventional water supply equipment, the rate of increase in the temperature of the water in the water receiving tank passing through the water receiving tank side heat exchanger is large, so in the intermediate period when the temperature of the water in the water receiving tank becomes high, etc. Since there is a possibility that the water in the water receiving tank is heated too much in the vessel, there is a problem that it is difficult to use the heat generated by the power generation means for heating the water in the water receiving tank.

  By the way, in order to reduce the temperature increase rate of the water in the water receiving tank passing through the water receiving tank side heat exchanger, the capacity of the circulating pump that circulates the water in the water receiving tank through the water receiving tank side heat exchanger is increased, and the water receiving tank It is assumed that the ratio of the heating capacity of the water in the water receiving tank flowing through the water receiving tank side heat exchanger to the amount of heat retained by the heat medium for exhaust heat recovery flowing through the side heat exchanger will be increased. Since the power consumption increases and the running cost increases, it is not preferable.

  The present invention has been made in view of such a situation, and its purpose is to avoid an increase in the circulation amount of water in the water receiving tank, while also in the intermediate period when the temperature of the water in the water receiving tank becomes high. It is providing the water supply equipment which can heat the water of this.

The water supply facility of the present invention is intended for a plurality of dwelling units included in an area or an apartment house, and a water receiving tank that stores water supplied from a water supply,
A water supply means for supplying water from the water receiving tank to each of the plurality of dwelling units through a water supply channel;
Power generation means for generating power in the region or the housing complex as a power supply target;
An exhaust heat recovery heating means for recovering the heat generated by the power generation means and heating the water in the water receiving tank;
In the first characteristic configuration, the exhaust heat recovery heating means includes:
Heat recovery side circulation means for recovering heat generated by the power generation means and circulating heat medium for exhaust heat recovery so as to supply heat to the buffer tank for storing the heat medium; and the buffer tank by the heat recovery side circulation means A heat receiving tank side circulating means for circulating the water in the water receiving tank so as to heat the water in the water receiving tank with the heat supplied to the heat recovery heat medium for exhaust heat recovery circulated by the heat recovery side circulating means And the water in the water receiving tank circulated by the water receiving tank side circulation means are provided in a form of being circulated in an unmixed state.

  That is, the heat recovery side circulation means circulates the exhaust heat recovery heat medium so as to collect heat generated by the power generation means and supply heat to the buffer tank storing the heat medium, and the water receiving tank side circulation means. The water in the water receiving tank is unmixed with the heat medium for exhaust heat recovery circulated by the heat recovery side circulation means, and the water in the water reception tank is heated by the heat supplied to the buffer tank by the heat recovery side circulation means. Circulate to heat.

That is, by recovering the heat generated by the power generation means and heating the heat medium stored in the buffer tank, the heat generated by the power generation means is supplied to the buffer tank, and the heat thus supplied to the buffer tank is supplied. Thus, the water in the water receiving tank is heated in such a form that the water in the water receiving tank is circulated so as to heat the water in the water receiving tank.
The buffer tank can store a large amount of heat medium, and can increase the ratio of the heating capacity of the heat medium stored in the buffer layer to the amount of heat supplied to the buffer layer by the heat recovery side circulation means. Therefore, heat is supplied to the buffer layer in a state where the rate of increase in the temperature of the heat medium in the buffer tank is small, and the water receiving tank is heated so as to be heated by the heat supplied to the buffer layer. In circulating the water, it is possible to reduce the rate of increase in the temperature of the water in the water receiving tank heated by the heat supplied to the buffer layer while avoiding an increase in the amount of water circulating in the water receiving tank. .

  Further, since the heat medium for exhaust heat recovery circulated by the heat recovery side circulation means and the water in the water reception tank circulated by the water reception tank side circulation means are circulated in an unmixed state, for example, heat Even if water is circulated as a heat medium in the recovery-side circulation means, the water receiving tank in which water that has been heated to a high temperature by recovery of the heat generated by the power generation means and has lost chlorine is circulated in the water-receiving tank-side circulation means. Therefore, it is possible to prevent a decrease in the chlorine content of the water in the water receiving tank.

Therefore, even in the intermediate period when the temperature of the water in the water receiving tank becomes high, the water in the water receiving tank should be appropriately heated so as not to give the user a feeling of lukewarm water and not to reduce the chlorine content. Can do.
In short, it is possible to provide a water supply facility that can appropriately heat the water in the water receiving tank even in an intermediate period where the temperature of the water in the water receiving tank becomes high while avoiding an increase in the circulation amount of the water in the water receiving tank. Became.

In addition to the first feature configuration, the second feature configuration is
The heat recovery side circulation means is provided so as to circulate the exhaust heat recovery heat medium through the heat dissipation heat medium passage provided in the buffer tank, and the water receiving tank side circulation means supplies the water of the water receiving tank. It is characterized by being provided to circulate through the buffer tank.

That is, the heat recovery side circulation means circulates the heat medium for exhaust heat recovery through the heat dissipation heat medium passage provided in the buffer tank, and the water reception tank side circulation means circulates the water in the water reception tank through the buffer tank. .
That is, the water circulated in the water receiving tank side circulation means is stored as a heat medium in the buffer tank, and the water in the buffer tank is heated by the heat recovery heat medium flowing through the heat dissipation heat medium passage. However, since the water in the water receiving tank is circulated through the buffer tank, a large amount of water in the buffer tank is heated by the exhaust heat recovery heat medium flowing through the heat dissipation heat medium passage. Since the rate of increase in the temperature of the heated water can be reduced, it is possible to appropriately heat the water in the water receiving tank while avoiding an increase in the circulation rate of the water in the water receiving tank.
And even if the temperature of the exhaust heat recovery heat medium flowing through the heat dissipation heat medium passage is increased, the rate of increase in the temperature of the water in the buffer layer can be reduced. Since the temperature difference between the exhaust heat recovery heat medium flowing through and the water in the buffer tank can be increased, the heat exchange efficiency between the exhaust heat recovery heat medium and the water is increased, and the water in the water receiving tank is increased. Heating efficiency can be improved.

Incidentally, the heat recovery side circulation means is provided so that the heat medium for exhaust heat recovery heated by the recovery of the heat generated by the power generation means is circulated through the buffer tank, and the water receiving tank side circulation means is provided in the buffer layer. It is assumed that it is provided to circulate through the heating water passage.
In this case, the exhaust heat recovery heat medium heated to a high temperature by the recovery of the heat generated by the power generation means is mixed with a large amount of the exhaust heat recovery heat medium in the buffer layer. Since the rate of increase in the temperature of the heating medium can be reduced, the rate of increase in the temperature of the water in the water receiving tank heated through the heating water passage can also be reduced.
However, in order not to heat the water in the water receiving tank that passes through the heating water passage to a high temperature, it is necessary to lower the temperature of the heat medium for exhaust heat recovery in the buffer layer, and the exhaust heat recovery in the buffer layer. Since the temperature difference between the heating medium and the water flowing through the heating water passage becomes small, the heat exchange efficiency between them decreases, and the heating efficiency of the water in the water receiving tank decreases.
Therefore, it is possible to provide a suitable means for improving the heating efficiency of water in the water receiving tank.

The third feature configuration is in addition to the second feature configuration,
The operation control means for controlling the operation is configured to adjust the heat medium circulation state by the heat recovery side circulation means so that the temperature of the water in the buffer tank is equal to or lower than the set upper limit water supply temperature. Features.

That is, the operation control means adjusts the heat medium circulation state by the heat recovery side circulation means so that the temperature of the water in the buffer tank is equal to or lower than the set upper limit water supply temperature. Heated to be:
And, by setting the set upper limit water supply temperature to a temperature lower than the temperature at which the user feels warm water, it is possible to further suppress giving the user a warm water feeling, and the set upper limit water supply By setting the temperature to a temperature at which chlorine contained in the water does not disappear, the decrease in the chlorine content of the water in the water receiving tank can be further suppressed.
Accordingly, it has become possible to provide a preferable means for further suppressing the user from giving lukewarm water feeling or further suppressing the decrease in the chlorine content of the water in the water receiving tank.

In addition to the third feature configuration, the fourth feature configuration is
The operation control means is configured to adjust the heat medium circulation state by intermittently circulating the heat medium by the heat recovery side circulation means.

That is, the temperature of the water in the buffer tank is controlled to be equal to or lower than the set upper limit water supply temperature by adjusting the heat medium circulation state in such a manner that the heat medium circulation by the heat recovery side circulation means is intermittent. The
As a configuration for intermittently circulating the heat medium by the heat recovery side circulation means, a structure for turning on or off a circulation pump for circulating the heat medium, or an open / close valve provided in a circulation path for circulating the heat medium, A simple configuration such as a configuration for opening and closing can be employed.

By the way, as a form to adjust the heat medium circulation state, a form to adjust the circulation amount of the heat medium by the heat recovery side circulation means can be considered, but if this form is adopted, the rotation speed of the circulation pump that circulates the heat medium is changed. It is necessary to provide a proportional valve for adjusting or adjusting the circulation amount of the heat medium, and to change and adjust the opening degree of the proportional valve, and the configuration becomes complicated, so the price of the water supply equipment increases.
Accordingly, it is possible to further suppress the user from giving lukewarm hot water feeling while reducing the cost of the water supply facility, or to further suppress the decrease in the chlorine content of the water in the water receiving tank.

In addition to any of the first to fourth feature configurations described above, the fifth feature configuration is
The operation control means for controlling the operation is configured such that the water in the water receiving tank is circulated by the water receiving tank side circulation means on the condition that the temperature of the heat medium in the buffer tank is equal to or higher than the temperature of the water in the water receiving tank. It is characterized by that.

  That is, the operation control means circulates the water in the water receiving tank by the water receiving tank side circulation means on the condition that the temperature of the heat medium in the buffer tank is equal to or higher than the temperature of the water in the water receiving tank. Can be prevented.

For example, an intermittent operation may be performed in which the power generation unit is operated in a part of a day. In addition, since the capacity of the buffer tank is usually smaller than the capacity of the water receiving tank, the temperature of the heat medium of the buffer tank is lower than that of the water of the water receiving tank when the heat of the power generation means is not supplied to the buffer tank. Easy to do.
And, when intermittent operation is performed, at the time of starting to start the operation of the power generation means, the temperature of the heat medium in the buffer tank may be lower than the temperature of the water in the water receiving tank, but in such a case However, after the temperature of the heat medium in the buffer tank becomes equal to or higher than the temperature of the water in the water receiving tank, the water is circulated by the water receiving tank side circulation means.
Therefore, since the water in the water receiving tank can be prevented from being cooled by circulating the water in the water receiving tank by the water receiving tank side circulation means, it is possible to further suppress giving the user a feeling of cold water. It became possible to supply water in the state.

In addition to any of the first to fifth feature configurations described above, the sixth feature configuration is
The water receiving tank side circulation means circulates the water in the water receiving tank so as to be heated by the heat supplied to the buffer tank, and the heat supplied to the buffer tank. It is characterized by the point that it can be switched to a hot water supply state to be supplied to the area or the apartment house through a hot water supply path that bypasses the water receiving tank after heating.

That is, when the water receiving tank side circulation means is switched to the water receiving tank heating state, the water in the water receiving tank is circulated so as to be heated by the heat supplied to the buffer tank, so that the water in the water receiving tank is heated.
On the other hand, when the water tank side circulation means is switched to the hot water supply state, the water in the water tank is heated by the heat supplied to the buffer tank, and then supplied to the region or the apartment house through the hot water supply path that bypasses the water tank. By heating the water in the water receiving tank to a temperature higher than the set upper limit water supply temperature by the heat supplied to the buffer tank, it is possible to supply hot water having a temperature preferable for bathing or the like to the area or the apartment house, for example. It becomes.

In other words, when the temperature of the water supplied from the water supply is high, such as in summer, even if water is supplied without heating the water supplied from the water supply, it is possible to prevent the user from feeling cold. Operation with the water tank side circulation means switched to the water tank heating state is not required.
Therefore, when the temperature of the water supplied from the water supply is high and the water supplied from the water supply can be prevented from giving a feeling of cold water to the user even if the water is supplied without heating, circulation in the water receiving tank side If the operation is performed with the means switched to the hot water supply state, the water supply equipment can be used effectively throughout the year.
Therefore, it has become possible to provide a water supply facility that can be used effectively throughout the year.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the water supply facility is configured to supply water to a plurality of dwelling units H included in an apartment house, and receive water supplied from a water supply 1 through a water receiving channel 2, and water in the water receiving tank 3. Is supplied to each of the plurality of dwelling units H through the water supply channel 4, a water supply pump 5 as a water supply means, a power generation apparatus G as a power generation means for generating electricity for the apartment house as a power supply target, and heat generated in the power generation apparatus G And a waste heat recovery heating unit K as a waste heat recovery heating unit for heating the water in the water receiving tank 3 and an operation control unit 6 as an operation control unit for controlling the operation of the water supply equipment. It is.

The water receiving tank 3 is provided with a float valve (not shown) that opens when the water level is lower than a predetermined set water level, and closes when the water level is higher than the set water level. The water channel 2 is connected, and water is supplied to the water receiving tank 3 through the water receiving channel 2 so as to reach the set water level.
The water receiving tank 3 is provided with a water receiving tank temperature sensor T1 for detecting the temperature of the water in the water receiving tank 1 (hereinafter sometimes referred to as the water receiving tank temperature).

The water supply channel 4 is branched into a plurality of branch water supply channels 4b, and the water in the water receiving tank 3 is supplied to each dwelling unit H through each branch water supply channel 4b. In other words, the branch water supply channel 4b heats the supplied water and a plurality of stop cocks 7 provided corresponding to each of the water supply points such as a sink, a washing machine, and a toilet of each dwelling unit H. It is branched and connected to a heat source unit 8 that supplies the hot water supply location.
Although illustration is omitted, the water supply channel 4 and the branch water supply channel 4b are covered with a heat insulating material and kept warm.

  Since the heat source unit 8 is well known, detailed description and illustration are omitted, and in brief, the heat source unit 8 is circulated through a hot water supply heat exchanger for heating water supplied through the branch water supply channel 4b and a recirculation circuit. It is configured with a heat exchanger for remedy that heats the hot water in the bathtub, a gas burner that heats the heat exchanger for hot water supply and the heat exchanger for remedy, and operates the water from the water supply channel 4 by remote control. Heated to a set hot water temperature set by a section, etc., and supplied to hot water taps 9 provided corresponding to each of hot water supply points such as a sink, bathroom, etc. It is.

  The power generator G includes a power generator 10 and a gas engine 11 that drives the power generator 10. Incidentally, by operating the gas engine 11, the power generation device G is operated, and by stopping the gas engine 11, the power generation device G is stopped.

  Further, the water supply facility includes a power receiving / transforming facility 13 that collectively receives commercial power from a commercial power source 12 with the apartment house serving as a power supply target, and a system that interconnects the generator 10 with the commercial power source 12. The power supply line 17 is provided so as to supply the power from the generator 10 and the commercial power supply 12 to the power consuming device 15 in the common part and the power consuming device 16 of each dwelling unit H of the supply target dwelling group. It is wired.

  The gas supply pipe 18 to which city gas is supplied includes a gas supply path 19 for supplying gas fuel to the gas consuming equipment of the shared part such as the gas engine 11 and the like, and gas fuel to each of the plurality of dwelling units H. Is connected to a gas supply path 20 for dwelling units. The gas supply path 20 for dwelling units is configured to branch into a plurality of branch gas supply paths 20b and supply gas fuel to the heat source unit 8 and the like of each dwelling unit H through each branch gas supply path 20b. .

  Next, the exhaust heat recovery heating unit K will be described. The exhaust heat recovery heating unit K recovers heat generated by the power generation apparatus G and supplies heat to the buffer tank 21 that stores the heat medium. The heat recovery side circulation part Kg as a heat recovery side circulation means for circulating the heat medium for exhaust heat recovery to the heat, and the water in the water receiving tank 3 is heated by the heat supplied to the buffer tank 21 by the heat recovery side circulation part Kg The heat receiving tank side circulation part Kr as the water receiving tank side circulation means for circulating the water in the water receiving tank 3 so that the heat recovery heat medium and the water receiving tank side circulation part are circulated in the heat recovery side circulation part Kg. The water in the water receiving tank 3 circulated by Kr is provided in a form of being circulated in an unmixed state.

The said buffer tank 21 is comprised by the airtight type which stores water in a full state as a heat medium, The temperature of the water inside the buffer tank 21 (Hereinafter, it may describe as buffer tank temperature.) Is provided with a buffer tank temperature sensor T2.
Furthermore, a pressure relief valve 22 is provided at the top of the buffer tank 21 to maintain the pressure in the buffer tank 21 below the set upper limit pressure.
Incidentally, the capacity of the buffer tank 21 is set smaller than the capacity of the water receiving tank 3. For example, when the capacity of the water receiving tank 3 is 75 tons, the capacity of the buffer tank 21 is set to about 1 to 2 tons.

  In this embodiment, the heat recovery side circulation section Kg is provided so as to circulate the exhaust heat recovery heat medium through the heat dissipation heat medium passage 23 provided in the buffer tank 21, and the water reception tank side circulation. The portion Kr is provided to circulate the water in the water receiving tank 3 through the buffer tank 21.

The water receiving tank side circulation section Kr will be described. The water receiving tank side circulation section Kr includes a water receiving tank side circulation path 24 that circulates water between the water receiving tank 3 and the buffer tank 21, and the water receiving tank side circulation path. 24 is provided with a water-receiving tank side circulation pump 25 provided at 24.
An outgoing path portion 24f for supplying water from the water receiving tank 3 to the buffer tank 21 in the water receiving tank side circulation path 24 is provided so as to connect the bottom of the water receiving tank 3 and the bottom of the buffer tank 21, and the outgoing path portion. 24f, the water tank circulator pump 25 is provided so as to supply water sucked from the bottom of the water tank 3 to the bottom of the buffer tank 21, and water is supplied from the buffer tank 21 to the water tank 3 in the water tank side circulation path 24. The return path portion 24b is provided so as to connect the top of the buffer tank 21 and the middle part of the water receiving tank 3 in the vertical direction.
In other words, the water in the water receiving tank 3 is circulated through the buffer tank 21 while the buffer tank 21 is in a full state by the flow action of the water receiving tank side circulation pump 25.

The hot water supply path 26 is branched from the return path portion 24b of the water tank side circulation path 24, and the hot water supply path 26 is connected to a shared bathtub 27 installed in the shared section, and the hot water supply path in the return path portion 24b. An opening / closing valve 28 for switching the flow state is provided in a portion downstream of the 26 branching points.
That is, the water receiving tank heating which circulates so that the water of the water receiving tank 3 is heated by the heat supplied to the buffer tank 21 by operating the water receiving side circulation pump 25 with the on-off valve 28 opened. The water tank 3 is heated by the heat supplied to the buffer tank 21 by operating the water-receiving-side circulation pump 25 with the open / close valve 28 closed, and then bypasses the water-receiving tank 3. The hot water supply state to be supplied to the housing complex through the hot water supply passage 26 is established.
In short, the water receiving side circulation section Kr is configured to be switchable between the water receiving tank heating state and the hot water supply state.

  Next, the heat recovery side circulation part Kg will be described. The heat recovery side circulation part Kg is provided in the cooling water circulation path 29 for circulating the engine cooling water of the gas engine 11 and the cooling water circulation path 29. Exhaust heat recovery heat medium circulation path 31 for circulating the exhaust heat recovery heat medium through the cooling water circulation pump 30, the heat dissipation heat medium passage 23, and the exhaust heat recovery heat provided in the exhaust heat recovery heat medium circulation path 31 Exhaust heat recovery heat for exchanging heat between the medium circulation pump 32 and the engine coolant flowing through the cooling water circulation path 29 and the exhaust heat recovery heat medium flowing through the exhaust heat recovery heat medium circulation path 31 An exchange 33 and the like are provided.

As shown in FIG. 2, the heat-dissipating heat medium passage 23 includes an outer cylinder 23a provided in the buffer tank 21 so that an outer peripheral surface thereof is in contact with water in the buffer tank 21, and an outer cylinder in the outer cylinder 23a. The inner tube 23b is disposed in a state having a gap with the inner peripheral surface of the tube 23a and has an inner cylinder 23b through which the heat medium for exhaust heat recovery flows.
And by configuring the heat-dissipating heat medium passage 23 in the double tube type in this way, even if there is a hole in either the outer cylinder 23a or the inner cylinder 23b, the water in the buffer tank 21 It is possible to prevent the exhaust heat recovery heat medium flowing through the inner cylinder 23a from being mixed.

  Further, as shown in FIG. 1, the cooling water passage 34 for heat radiation is connected to the cooling water circulation passage 29 so as to circulate the engine cooling water by bypassing the exhaust heat recovery heat exchanger 33, and the connection The exhaust heat recovery state in which the cooling water is passed through the exhaust heat recovery heat exchanger 33 and the heat dissipation that bypasses the exhaust heat recovery heat exchanger 33 and passes the cooling water through the heat dissipation cooling water passage 34. A three-way valve 35 for switching to a state is provided, and a radiator 36 is provided in the cooling water passage 34 for heat dissipation.

  And in this water supply equipment, the said operation control part 6 collects the heat which generate | occur | produces in the electric power generating apparatus G, the water receiving tank heating operation which heats the water of the water receiving tank 3, and the heat which generate | occur | produces in the electric power generating apparatus G is said radiator The heat radiation operation for radiating the water in 36, the preheating operation for heating the water in the buffer tank 21 with the heat supplied to the buffer tank 21 in the state where the circulation of the water in the water receiving tank 3 is stopped, After the water is heated by the heat supplied to the buffer tank 21, the hot water supply operation of supplying the shared bathtub 27 through the hot water supply path 26 that bypasses the water receiving tank 3 can be executed.

Hereinafter, description will be added for each of the above operations.
In the water receiving tank heating operation, the operation control unit 6 operates the water receiving side circulation pump 25, opens the on-off valve 28, and switches the water receiving tank side circulation unit Kr to the water receiving tank heating state. The three-way valve 35 is switched to the exhaust heat recovery state, the cooling water circulation pump 30 and the exhaust heat recovery heat medium circulation pump 32 are operated, and the radiator 36 is stopped.
In this water tank heating operation, as described below, the heat generated in the power generation device G can be recovered to heat the water in the water tank 3.

  That is, heat exchange is performed between the engine cooling water flowing through the cooling water circulation path 29 and the exhaust heat recovery heat medium flowing through the exhaust heat recovery heat medium circulation path 31 in the exhaust heat recovery heat exchanger 33. Then, the heat generated from the gas engine 11 is recovered in the exhaust heat recovery heat medium flowing through the exhaust heat recovery heat medium circulation path 31, and the heat generated in the exhaust heat recovery is recovered from the generated heat from the gas engine 11. As the medium circulates through the heat dissipation heat medium passage 23 provided in the buffer tank 21, the heat is dissipated from the exhaust heat recovery heat medium to the water in the buffer tank 21 through the heat dissipation heat medium path 23. The water in the water tank 3 circulates in a state where it flows through the buffer tank 21 and is heated, and the water in the water receiving tank 3 is heated.

  In short, as described above, the heat recovery side heat exchange section Kg circulates the heat medium for exhaust heat recovery so as to supply heat to the buffer tank 21 that recovers the generated heat of the power generation apparatus G and stores the heat medium. The water receiving tank 3 is circulated in the water receiving tank 3 so that the water in the water receiving tank 3 is heated by the heat supplied to the buffer tank 21 by the heat recovery side circulating unit Kg. The exhaust heat recovery heating unit K is configured as described above, and the heat recovery heat recovery medium that is circulated in the heat recovery side circulation unit Kg between the heat recovery side heat exchange unit Kg and the water receiving tank side circulation unit Kr. And the water in the water receiving tank 3 circulated in the water receiving tank side circulation section Kr are provided in a form of being circulated in an unmixed state.

  In the heat radiation operation, the operation control unit 6 stops the water-receiving side circulation pump 25 and the exhaust heat recovery heat medium circulation pump 32, switches the three-way valve 35 to the heat radiation state, and the cooling water circulation pump 30. And the radiator 36 is operated.

  In this heat radiation operation, the water in the water receiving tank 3 is circulated through the buffer tank 21, the exhaust heat recovery heat medium is circulated through the heat dissipation heat medium passage 23, and the engine is cooled through the exhaust heat recovery heat exchanger 33. Since the water circulation is stopped and the engine cooling water is circulated through the radiator 36, the heating of the water in the water receiving tank 3 by the heat generated by the gas engine 11 is stopped, and the heat generated by the gas engine 11 is generated in the radiator 36. Heat is dissipated.

  In the preliminary heating operation, the operation control unit 6 stops the water-receiving side circulation pump 25, closes the open / close valve 28, switches the three-way valve 35 to the exhaust heat recovery state, and supplies the cooling water circulation pump. 30 and the exhaust heat recovery heat medium circulation pump 32 are operated, and the radiator 36 is stopped.

  In this preheating operation, the heat medium for exhaust heat recovery that recovered the heat generated from the gas engine 11 is provided in the buffer tank 21 while the circulation of the water in the water receiving tank 3 through the buffer tank 21 is stopped. Since it circulates through the heat dissipation medium passage 23, the water in the buffer tank 21 can be heated to a higher temperature.

  In the hot water supply operation, the operation control unit 6 operates the water-receiving side circulation pump 25, closes the on-off valve 28, switches the water-receiving tank side circulation unit Kr to the hot water supply state, and the three-way valve 35 The cooling water circulation pump 30 is operated in a state in which is switched to the exhaust heat recovery state, the exhaust heat recovery heat medium circulation pump 32 is operated, and the radiator 36 is stopped.

In this hot water supply operation, the heat medium for exhaust heat recovery that recovers the heat generated from the gas engine 11 circulates through the heat medium path 23 for heat dissipation provided in the buffer tank 21, so that the heat dissipation heat medium path 23. The heat is recovered from the exhaust heat recovery heat medium to the water in the buffer tank 21 to heat the water in the water receiving tank 3.
Then, when the water in the water receiving tank 3 is supplied into the buffer tank 21 by the water receiving side circulation pump 25, the hot water in the buffer tank 21 is pushed out and supplied to the shared bathtub 27 through the hot water supply path 26. Further, the water in the water receiving tank 3 supplied into the buffer tank 21 is also heated in the buffer tank 21 and supplied to the shared bathtub 27 through the hot water supply path 26, and is supplied to the shared bathtub 27. .

Next, the control operation of the operation control unit 6 will be described.
The operation control unit 6 is provided with an operation panel 37 for instructing various control information. Although not shown, the operation panel 37 includes an operation switch for instructing operation start and operation stop of the water supply equipment, and hot water supply start. And a hot water supply switch for instructing stoppage of hot water supply, and a hot water supply temperature setting unit for setting a hot water supply target temperature.
Further, the set upper limit water supply temperature and the set heating start temperature lower than the set upper limit water supply temperature are set in advance and stored in the operation control unit 6. Incidentally, the set upper limit water supply temperature is set to a temperature at which the user does not feel lukewarm water and can prevent the disappearance of chlorine contained in water, and is set to 20 ° C., for example. The set heating start temperature is set to 18 ° C., for example.

The operation control unit 6 is configured to adjust the heat medium circulation state by the heat recovery side circulation unit Kg so that the temperature of the water in the buffer tank 21 is equal to or lower than the set upper limit water supply temperature.
In this embodiment, the operation control unit 6 is configured to adjust the heat medium circulation state by intermittently circulating the heat medium by the heat recovery side circulation unit Kg.

  Further, the operation control unit 6 is configured such that the temperature of the heat medium (water in this embodiment) of the buffer tank 21 is equal to or higher than the temperature of the water of the water receiving tank 3 and the water receiving tank 3 by the water receiving tank side circulation unit Kr. The water is circulated.

Hereinafter, the control operation of the operation control unit 6 will be described based on the flowchart shown in FIG.
When the operation start command is instructed (step # 1), the operation control unit 6 operates the power generator G (step # 2). When the hot water supply command is instructed, the operation control unit 6 supplies hot water through the hot water supply passage 26. When hot water supply processing is executed (steps # 3 and 5) and no hot water supply command is instructed, or when hot water supply stop is instructed during execution of hot water supply processing, the water in the water receiving tank 3 is heated. The water receiving tank heating process is executed (steps # 3 and 4). When an operation stop command is issued during the execution of the water receiving tank heating process or the hot water supply process (step # 6), the power generator G is stopped (step #). 7) Return.

Hereinafter, the water tank heating process and the hot water supply process will be described.
In the following description, the buffer tank temperature detected by the buffer tank temperature sensor T2 is simply described as the buffer tank temperature, and the water receiving tank temperature detected by the water receiving tank temperature sensor T1 is simply described as the water receiving tank temperature. To do.
When the buffer tank temperature is equal to or higher than the water tank temperature, the operation control unit 6 immediately executes the water tank heating operation when the buffer tank temperature is equal to or higher than the water tank temperature, and the buffer tank temperature is lower than the water tank temperature. First, the preheating operation is executed, and when the buffer tank temperature becomes equal to or higher than the water receiving tank temperature, the preheating operation is stopped and the water receiving tank heating operation is executed.

  That is, when the buffer tank temperature is lower than the water receiving tank temperature, the circulation of the water in the water receiving tank 3 by the water receiving tank side circulation section Kr is stopped, and when the buffer tank temperature is equal to or higher than the water receiving tank temperature, the water receiving tank side circulation section. Circulation of the water in the water receiving tank 3 by Kr is performed, and as described above, the operation control unit 6 is operated under the condition that the temperature of the heat medium in the buffer tank 21 is equal to or higher than the temperature of the water in the water receiving tank 3. The water in the water receiving tank 3 is circulated by the water receiving tank side circulation section Kr.

  Further, in the water tank heating process, the operation control unit 6 stops the water tank heating operation and performs a heat radiation operation when the buffer tank temperature becomes equal to or higher than the set upper limit water supply temperature during the water tank heating operation. When the buffer tank temperature falls below the preset heating start temperature during the heat radiation operation, the water tank heating operation and the heat radiation operation are repeatedly executed in such a form that the heat radiation operation is stopped and the water tank heating operation is performed. As a result, the temperature in the buffer tank 21 is maintained below the set upper limit water supply temperature, so the temperature of the water in the water receiving tank 3 is also maintained below the set upper limit temperature.

  That is, in the water tank heating operation, the heat recovery side circulation unit Kg circulates the exhaust heat recovery heat medium through the heat dissipation heat medium passage 23, and in the heat dissipation operation, the heat recovery side circulation unit Kg exhaust heat recovery heat medium. As described above, the operation control unit 3 causes the heat recovery side circulation unit Kg to change the temperature of the water in the buffer tank 21 to be equal to or lower than the set upper limit water supply temperature. By repeating the circulation, the heat medium circulation state by the heat recovery side circulation part Kg is adjusted.

  Further, in the water tank heating process, the operation control unit 6 stops the water tank heating operation and performs the preheating operation when the buffer tank temperature becomes lower than the water tank temperature during the water tank heating operation. When the buffer tank temperature becomes equal to or higher than the water receiving tank temperature during the preheating operation, the preheating operation is stopped and the water receiving tank heating operation is executed.

In the hot water supply process, the operation control unit 6 performs the preliminary heating operation until the buffer tank temperature reaches the hot water supply target temperature set by the hot water supply temperature setting unit, and the buffer tank temperature is set to the hot water supply temperature setting. When the hot water supply target temperature set in the section is reached, the preheating operation is stopped and the hot water supply operation is executed.
Accordingly, the hot water at the hot water supply target temperature set by the hot water supply temperature setting unit is supplied to the shared bathtub 27.

[Another embodiment]
Next, another embodiment will be described.
(A) Specific configurations of the heat recovery side circulation unit Kg and the water receiving tank side circulation unit Kr are not limited to the configurations exemplified in the above embodiment.
For example, as shown in FIG. 4, the heat recovery side circulation unit Kg is provided so as to circulate the heat medium for exhaust heat recovery through the heat exchanger 33 for exhaust heat recovery and the inside of the buffer tank 21, and You may comprise the water tank side circulation part Kr so that the water of the said water receiving tank 3 may be circulated through the water passage 38 for heating provided in the said buffer tank 21. FIG.
Further, as shown in FIG. 5, the heat recovery side circulation section Kg is provided so as to circulate the exhaust heat recovery heat medium through the heat dissipation heat medium passage 23 provided in the buffer tank 21, and the water reception tank side. The circulation unit Kr may be configured to circulate the water in the water receiving tank 3 through the heating water passage 38 provided in the buffer tank 21.

(B) As a form of adjusting the heat medium circulation state by the heat recovery side circulation part Kg, instead of the form of intermittent circulation of the heat medium by the heat recovery side circulation part Kg, circulation of the heat medium by the heat recovery side circulation part Kg A form of adjusting the amount can be adopted.
In this case, the rotational speed of the exhaust heat recovery circulation pump 32 can be changed and adjusted, and the circulation amount of the heat medium is adjusted by changing and adjusting the rotation speed of the exhaust heat recovery heat medium circulation pump 32. Alternatively, a proportional valve is provided in the heat medium circulation path 31 for exhaust heat recovery, and the circulation amount of the heat medium is adjusted by adjusting the opening of the proportional valve.

(C) The rotational speed of the water receiving tank side circulation pump 25 is configured to be freely adjustable, and in the hot water supply operation, the rotational speed of the water receiving tank side circulation pump 25 is slowed down to flow through the buffer tank 21. The flow rate of water to be used may be reduced so that hot water can be continuously supplied through the hot water supply passage 26.

(D) The hot water supply path 26 may be branched and connected to each of the plurality of dwelling units H so that the hot water supply operation can supply hot water to each of the plurality of dwelling units H through the hot water supply path 26.

(E) The exhaust heat recovery heat medium circulation path 31, the exhaust heat recovery heat exchanger 33, and the exhaust heat recovery heat medium circulation pump 32 are omitted, and the cooling water circulation path 29 is connected to the heat dissipation heat medium path. The heat recovery side circulation unit Kg may be configured to circulate the engine coolant as a heat medium for exhaust heat recovery.

(F) The operation time zone for operating the water supply equipment may be set to a predetermined part of the day, and the water supply equipment may be automatically operated during the operation time period. .

(G) When the power generation device G is configured as an engine drive type including the generator 10 and the gas engine 11 that drives the generator 10 as in the above embodiment, the exhaust heat recovery heating unit K As the generated heat of the power generation device G recovered at the above, in addition to the retained heat of the engine cooling water exemplified in the above embodiment, the retained heat of the exhaust gas of the gas engine 11 and the retained heat of both the engine cooling water and the exhaust gas good.
When the power generation device G is configured as an engine drive type, the engine uses various fuels such as LP gas and gasoline in addition to the gas engine 11 that uses city gas as a fuel exemplified in the above embodiment. Can be used.
Further, the power generation apparatus G may be configured by a gas turbine drive type that is driven by a gas turbine, in addition to the engine drive type as exemplified in the above embodiment. When the power generator G is configured by a gas turbine drive type, the generated heat of the power generator G recovered by the exhaust heat recovery heating unit K becomes the retained heat of the exhaust gas of the gas turbine.
In addition, the power generation device G is not limited to the above-described engine drive type or gas turbine drive type, and may be configured by various fuel cells, for example. When the power generation device G is constituted by a fuel cell, the heat generated by the power generation device G recovered by the exhaust heat recovery heating unit K becomes the retained heat of the cooling water of the fuel cell.

The block diagram which shows the whole structure of the water supply equipment which concerns on embodiment The figure which shows the heat-medium channel | path for heat radiation of the water supply equipment which concerns on embodiment The figure which shows the flowchart of control operation | movement of the water supply equipment which concerns on embodiment The block diagram which shows the waste heat recovery heating part of the water supply equipment which concerns on another embodiment The block diagram which shows the waste heat recovery heating part of the water supply equipment which concerns on another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water supply 3 Water receiving tank 4 Water supply path 5 Water supply means 6 Operation control means 21 Buffer tank 23 Heat-dissipation heat medium path 26 Hot water supply path G Electric power generation means H Dwelling unit K Waste heat recovery heating part Kg Heat recovery side circulation means Kr Receiving tank side circulation means

Claims (6)

A water receiving tank for storing water supplied from the water supply for a plurality of dwelling units included in an area or apartment house,
A water supply means for supplying water from the water receiving tank to each of the plurality of dwelling units through a water supply channel;
Power generation means for generating power for the area or the apartment house as a power supply target;
A water supply facility provided with exhaust heat recovery heating means for recovering heat generated by the power generation means and heating the water in the water receiving tank,
The exhaust heat recovery heating means,
Heat recovery side circulation means for circulating the heat medium for exhaust heat recovery so as to recover heat generated by the power generation means and supply heat to the buffer tank for storing the heat medium, and the buffer tank by the heat recovery side circulation means A heat receiving tank side circulating means for circulating the water in the water receiving tank so as to heat the water in the water receiving tank with the heat supplied to the heat recovery heat medium for exhaust heat recovery circulated by the heat recovery side circulating means And water supply equipment configured to circulate in a non-mixed state with water in the water receiving tank circulated by the water receiving tank side circulation means.   The heat recovery side circulation means is provided so as to circulate the exhaust heat recovery heat medium through the heat dissipation heat medium passage provided in the buffer tank, and the water receiving tank side circulation means supplies the water of the water receiving tank. The water supply equipment according to claim 1, wherein the water supply equipment is provided so as to circulate through the buffer tank.   The operation control means for controlling the operation is configured to adjust the heat medium circulation state by the heat recovery side circulation means so that the temperature of the water in the buffer tank is equal to or lower than a set upper limit water supply temperature. 2. Water supply equipment according to 2.   The water supply equipment according to claim 3, wherein the operation control means is configured to adjust the heat medium circulation state by intermittently circulating the heat medium by the heat recovery side circulation means.   The operation control means for controlling the operation is configured such that the water in the water receiving tank is circulated by the water receiving tank side circulation means on the condition that the temperature of the heat medium in the buffer tank is equal to or higher than the temperature of the water in the water receiving tank. The water supply equipment according to any one of claims 1 to 4.   The water receiving tank side circulation means circulates the water in the water receiving tank so as to be heated by the heat supplied to the buffer tank, and the heat supplied to the buffer tank. The water supply of any one of Claims 1-5 comprised so that it can switch to the hot-water supply state supplied to the said area or a housing complex through the hot-water supply path which detours the said water-receiving tank after heating in water Facility.

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