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CN108800272B - Operation method of multi-energy complementary cooling and heating unit - Google Patents

Operation method of multi-energy complementary cooling and heating unit Download PDF

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Publication number
CN108800272B
CN108800272B CN201810573941.2A CN201810573941A CN108800272B CN 108800272 B CN108800272 B CN 108800272B CN 201810573941 A CN201810573941 A CN 201810573941A CN 108800272 B CN108800272 B CN 108800272B
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water
heat
storage tank
temperature
outlet
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CN108800272A (en
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马洪亭
赖俊文
李琛
杨帆
李子豪
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Tianjin University
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Tianjin University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/12—Tube and panel arrangements for ceiling, wall, or underfloor heating
    • F24D3/14—Tube and panel arrangements for ceiling, wall, or underfloor heating incorporated in a ceiling, wall or floor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
    • F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
    • F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
    • F25B27/007—Machines, plants or systems, using particular sources of energy using solar energy in sorption type systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62—Absorption based systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention discloses an operation method of a multi-energy complementary cooling and heating unit, which comprises the following steps: the system comprises a solar water heating system, an electric heat storage boiler and a lithium bromide absorption refrigerating unit. The invention utilizes the solar water heating system and the electric heat storage boiler to heat in winter, simultaneously is linked with the bipolar lithium bromide absorption refrigerating unit in summer, utilizes the lithium bromide refrigerating unit to refrigerate, solves the problem of refrigeration in summer, fully prolongs the service time of solar energy, and saves initial investment at the same time. The solar water heating system and the electric heat storage boiler effectively utilize the clean energy of solar energy, play a role of 'peak clipping and valley filling' for the power load of a power grid, save the running cost by utilizing the peak valley price, have stable and reliable system, have no influence of outdoor weather conditions on the water supply quantity of the system, and can keep the system to run stably and efficiently all the year round.

Description

Operation method of multi-energy complementary cooling and heating unit
Technical Field
The invention relates to a cooling and heating system, in particular to a solar energy, electric heat storage boiler and lithium bromide refrigerating unit multi-energy complementary cooling and heating system.
Background
Under the situation that the conventional energy is increasingly exhausted, the human beings pay more and more attention to the utilization of solar energy, and a solar water heating system is one of the solar energy systems which are used at the earliest and have the highest utilization efficiency, so that considerable energy-saving benefits can be obtained when the solar water heating system is applied to a hot water supply system. The electric heat storage hot water system is prepared by heating all or part of hot water required by a building in the daytime by an electric boiler at night (in an electric power valley period), and storing the hot water for use in the daytime. The system not only plays a role of 'peak clipping and valley filling' for the power load of the power grid, but also can save the operating cost by utilizing the peak-valley electricity price, has high electric heat conversion efficiency and stable and reliable system, ensures that the water supply amount of the system is not influenced by outdoor weather conditions, and can keep the system to operate stably and efficiently all the year round. Among the various existing refrigeration modes utilizing solar energy, the solar lithium bromide absorption refrigerator has high refrigeration efficiency and can operate at a low heat source temperature, and is one of the most successful modes applying solar energy for refrigeration at present.
At present, there are cooling and heating systems designed by using the above-mentioned technology, such as solar-assisted heating electric heat storage system and solar lithium bromide absorption refrigeration system. For example, the invention patent of Liyan of northeast university provides a system and method for heating by combining an electric heat storage boiler and solar energy. The solar auxiliary heating electric heat storage system utilizes green and environment-friendly solar energy to heat, simultaneously well utilizes peak-valley electricity price difference to reduce operation cost, and ensures stable operation of the system, but the solar auxiliary heating electric heat storage system can only be used for heating in winter. The solar lithium bromide absorption refrigeration system utilizes a solar lithium bromide absorption refrigeration technology, has higher solar refrigeration efficiency, but is greatly limited by weather conditions. The existing methods have not been effective in solving this problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an operation method of a multi-energy complementary cooling and heating unit which has the advantages of environmental protection and economic operation and can ensure the stability of a system.
The technical scheme adopted by the invention is as follows:
an operation method of a multi-energy complementary cooling and heating unit comprises the following steps:
when the water level in the water storage tank is between the set water level and the highest water level and cold supply or heat supply is needed, a valve at the outlet of the water storage tank is opened, hot water in the water storage tank flows out, and the temperature T of outlet water of the water storage tank is detectedGo outMeanwhile, when the sunlight raises the water in the heat collector to a set temperature, the hot water at the upper part of the heat collector flows into the water storage tank, and meanwhile, the low-temperature water at the bottom of the water storage tank is sent into the heat collector, so that the water in the water storage tank is heated circularly; when the water level of the water storage tank is lower than the set water level, the solar water heating system performs constant temperature water supplementSo as to ensure that a water storage tank of the solar water heating system is at a normal water level;
the solar water heating system comprises a water storage tank and a solar heat collector, and the solar water heating system performs constant temperature water supplement and comprises the following specific steps:
when the water level of the water storage tank is lower than a set water level, when the sunlight raises the water of the heat collector to a set temperature, the hot water on the upper part of the heat collector flows into the water storage tank to replenish water, and meanwhile, low-temperature tap water is replenished into the heat collector, when the sunlight raises the water of the heat collector to the set temperature again, the water is replenished into the water storage tank again, and the steps are repeated until the water level of the water storage tank reaches the highest liquid level, and the tap water is stopped being replenished into;
the hot water in the water storage tank is controlled by the following three methods after flowing out:
controlling the first time in winter when T is reachedGo outWhen the temperature is 35-50 ℃, the water at the outlet of the water storage tank is used as ground heating water to be supplied to a heating device at a user side, and the water can be used as a radiating and heat-dissipating tail end of a floor; in summer, when TGo outWhen the temperature is 60-75 ℃, the water at the outlet of the water storage tank is used as heat source water and is sent into a lithium bromide absorption refrigerating unit;
controlling the second time when T is in winterGo out>At 50 ℃, the water at the outlet of the water storage tank is mixed with the tap water to form mixed water so that the temperature T of the mixed water isMixing ofWhen the temperature is 35-50 ℃, the water is used as ground heating water to be supplied to a heating device at a user side; in summer, when TGo out>At 75 ℃, the water at the outlet of the water storage tank is mixed with tap water to form mixed water as heat source water to enable the T to be heatedMixing ofFeeding the mixture into a lithium bromide absorption refrigerating unit at the temperature of 60-75 ℃;
controlling the third time when T is reached in winterGo out<At 35 ℃; in summer, when TGo out<At 60 deg.C, the flow rate of tap water mixed with outlet water of water storage tank is reduced, so that the temp. of mixed water and water can be respectively held at T set in control oneGo outWinter value range and summer value range; if the tap water is stopped from being mixed into the outlet water of the water storage tank, the T time in winter still cannot be ensuredGo outT is 35-50 ℃ in summerGo outStarting an electric heat storage system at 60-75 ℃, wherein the electric heat storage system comprises an electric boiler and a heat storage deviceThe water tank comprises the following concrete control steps: (1) when the electric boiler is in a valley electricity price period, the electric boiler is opened, part of hot water at the outlet of the electric boiler enters the heat storage water tank, the lower-temperature water at the lower part of the heat storage water tank returns to the electric boiler for circular heating, the other part of hot water at the outlet of the electric boiler flows through the plate heat exchanger to be used as a heat source to exchange heat with the outlet water of the water storage tank, so that the outlet water of the water storage tank forms heat exchange water, and the water temperature T of the heatChangeable pipeWhen the temperature is 35-50 ℃, the water is used as ground heating water to be supplied to a heating device at a user side; in summer, the temperature T of the heat exchange waterChangeable pipeFeeding the water serving as heat source water into a lithium bromide absorption refrigerating unit at the temperature of 60-75 ℃; if the temperature of the heat storage water tank reaches a set value, all hot water generated by the electric boiler is used for heat exchange of the plate heat exchanger; (2) when the peak electricity price period is in, firstly, the heat storage water tank is started to provide hot water for the plate heat exchanger, the hot water in the heat storage water tank continuously circulates through the plate heat exchanger to heat water at the outlet of the water storage tank, when the temperature of the water provided by the heat storage water tank is lower than a set value, the heat storage water tank stops water outlet, the electric boiler is opened, the water outlet of the electric boiler provides a required heat source for the plate heat exchanger, and the peak-valley electricity price difference is effectively utilized;
controlling the water at the outlet of the water storage tank after the heat dissipation of the heating device at the user side in the first, second and third steps as return water to flow back to the water storage tank of the solar water heating system in winter; in summer, controlling the water at the outlet of the water storage tank, which is used as a working heat source and subjected to heat exchange by the lithium bromide absorption refrigerating unit in the first, second and third modes, to flow back to the water storage tank of the solar water heating system, and in the other loop connected with the evaporator of the lithium bromide absorption refrigerating unit, after the heat of the low-temperature refrigerant water subjected to heat exchange with the evaporator is radiated by a fan coil device at the user side, the low-temperature refrigerant water serving as return water flows into the evaporator of the lithium bromide refrigerating unit for continuous refrigeration and continuous circulation to provide cold energy indoors.
Compared with the prior art, the invention has the following beneficial effects:
the invention effectively realizes the complementary utilization of various energy sources, simultaneously utilizes the peak-valley electricity price difference and saves the operating cost of the system. Although the centralized heat supply type solar water heating system is an energy-saving system, the centralized heat supply type solar water heating system cannot stably and reliably supply hot water all year around due to the influence of outdoor weather conditions and water replenishing temperature, and the centralized heat supply type solar water heating system is combined with an electric heat storage system to play a role in making up for deficiencies. The system not only plays a role of 'peak clipping and valley filling' for the power load of the power grid, but also can save the operating cost by utilizing the peak valley price, is stable and reliable, has no influence on the water supply quantity of the system by the outdoor weather condition, and can keep the system to operate stably and efficiently all the year round.
The invention utilizes the solar water heating system and the electric heat storage boiler to heat in winter, simultaneously is linked with the bipolar lithium bromide absorption refrigerating unit in summer, utilizes the lithium bromide refrigerating unit to refrigerate, solves the problem of refrigeration in summer and saves initial investment.
Drawings
FIG. 1 is a schematic diagram of a multi-energy complementary cooling and heating unit used in the method of the present invention.
Detailed Description
The invention is described below with reference to the accompanying drawings and specific embodiments.
The invention relates to an operation method of a multi-energy complementary cooling and heating unit, which is shown in figure 1 and comprises the following steps:
when the water level in the water storage tank is between the set water level and the highest water level and cold supply or heat supply is needed, a valve at the outlet of the water storage tank is opened, hot water in the water storage tank flows out, and the temperature T of outlet water of the water storage tank is detectedGo outMeanwhile, when the sunlight raises the water in the heat collector to a set temperature, the hot water on the upper part of the heat collector flows into the water storage tank, and meanwhile, the low-temperature water at the bottom of the water storage tank is sent into the heat collector, so that the water in the water storage tank is heated circularly. When the water level of the water storage tank is lower than the set water level, the solar water heating system maintains the constant temperature and supplements water to ensure that the water storage tank of the solar water heating system is at the normal water level;
the solar water heating system comprises a water storage tank and a solar heat collector, and the solar water heating system performs constant temperature water supplement and comprises the following specific steps:
when the water level of the water storage tank is lower than a set water level, when the sunlight raises the water of the heat collector to a set temperature, the hot water on the upper part of the heat collector flows into the water storage tank to replenish water, and meanwhile, the low-temperature tap water is replenished into the heat collector, and when the sunlight raises the water of the heat collector to the set temperature again, the water is replenished into the water storage tank again. Repeating the steps until the water level of the water storage tank reaches the highest liquid level, and stopping supplying tap water into the heat collector.
The hot water in the water storage tank is controlled by the following three methods after flowing out:
controlling the first time in winter when T is reachedGo outWhen the temperature is 35-50 ℃, the water at the outlet of the water storage tank is used as ground heating water to be supplied to a heating device at a user side, and the water can be used as a radiating and heat-dissipating tail end of a floor; in summer, when TGo outWhen the temperature is 60-75 ℃, the water at the outlet of the water storage tank is used as heat source water and is sent into a lithium bromide absorption refrigerating unit;
controlling the second time when T is in winterGo out>At 50 ℃, the water at the outlet of the water storage tank is mixed with the tap water to form mixed water so that the temperature T of the mixed water isMixing ofWhen the temperature is 35-50 ℃, the water is used as ground heating water to be supplied to a heating device at a user side; in summer, when TGo out>At 75 ℃, the water at the outlet of the water storage tank is mixed with tap water to form mixed water as heat source water to enable the T to be heatedMixing ofFeeding the mixture into a lithium bromide absorption refrigerating unit at the temperature of 60-75 ℃;
controlling the third time when T is reached in winterGo out<At 35 ℃; in summer, when TGo out<At 60 deg.C, the flow rate of tap water mixed with outlet water of water storage tank is reduced, so that the temp. of mixed water and water can be respectively held at T set in control oneGo outWinter value range and summer value range; if the tap water is stopped from being mixed into the outlet water of the water storage tank, the T time in winter still cannot be ensuredGo outT is 35-50 ℃ in summerGo outThe method comprises the following steps of starting an electric heat storage system at 60-75 ℃, wherein the electric heat storage system comprises an electric boiler and a heat storage water tank, and the specific control steps are as follows: (1) when the electric boiler is in a valley electricity price period, the electric boiler is opened, part of hot water at the outlet of the electric boiler enters the heat storage water tank, the lower-temperature water at the lower part of the heat storage water tank returns to the electric boiler for circular heating, the other part of hot water at the outlet of the electric boiler flows through the plate heat exchanger to be used as a heat source to exchange heat with the outlet water of the water storage tank, so that the outlet water of the water storage tank forms heat exchange water, and the water of the heat exchangeTemperature TChangeable pipeWhen the temperature is 35-50 ℃, the water is used as ground heating water to be supplied to a heating device at a user side; in summer, the temperature T of the heat exchange waterChangeable pipeFeeding the water serving as heat source water into a lithium bromide absorption refrigerating unit at the temperature of 60-75 ℃; if the temperature of the heat storage water tank reaches a set value, all the hot water generated by the electric boiler is used for heat exchange of the plate heat exchanger. (2) When the peak electricity price period is in, firstly, the heat storage water tank is started to provide hot water for the plate heat exchanger, the hot water in the heat storage water tank continuously circulates through the plate heat exchanger to heat water at the outlet of the water storage tank, when the temperature of the water provided by the heat storage water tank is lower than a set value, the heat storage water tank stops water outlet, the electric boiler is opened, the water outlet of the electric boiler provides a required heat source for the plate heat exchanger, and the peak-valley electricity price difference is effectively utilized;
controlling the water at the outlet of the water storage tank after the heat dissipation of the heating device at the user side in the first, second and third steps as return water to flow back to the water storage tank of the solar water heating system in winter; in summer, controlling the water at the outlet of the water storage tank, which is used as a working heat source and subjected to heat exchange by the lithium bromide absorption refrigerating unit in the first, second and third modes, to flow back to the water storage tank of the solar water heating system, and in the other loop connected with the evaporator of the lithium bromide absorption refrigerating unit, after the heat of the low-temperature refrigerant water subjected to heat exchange with the evaporator is radiated by a fan coil device at the user side, the low-temperature refrigerant water serving as return water flows into the evaporator of the lithium bromide refrigerating unit for continuous refrigeration and continuous circulation to provide cold energy indoors.
The method of the invention as shown in fig. 1 adopts a multi-energy complementary cooling and heating system, which comprises a solar water heating system, an electric heat storage system and a lithium bromide absorption refrigerating unit;
the lithium bromide absorption refrigerating unit is a bipolar lithium bromide absorption refrigerating unit, can produce cold energy under the condition of low temperature of heat source water, and is beneficial to utilization of low-grade energy. The inlet of the lithium bromide absorption refrigerating unit generator is connected with a ninth electromagnetic valve V9, the outlet of the lithium bromide absorption refrigerating unit generator is directly connected to a water storage tank of the solar water heating system to form a loop, the outlet of the evaporator of the lithium bromide absorption refrigerating unit generator is sequentially connected with a tenth electromagnetic valve V10, a fifth circulating pump P5, a fan coil phase at a user side, an eleventh electromagnetic valve V11 and the inlet of the evaporator of the lithium bromide absorption refrigerating unit through pipelines, and the circulation is continuous to provide cold energy;
the solar water heating system comprises a water storage tank and a plurality of solar heat collectors arranged in parallel, water inlets of the solar water heaters are connected with an outlet of a first circulating pump P1 through a first pipeline, an inlet of the first circulating pump P1 is communicated with a first water outlet of the water storage tank, water outlets of the solar heat collectors are communicated with a water inlet of the water storage tank through a second pipeline, the first pipeline at the water inlet of the solar heat collectors is communicated with an outlet of a tap water replenishing pipeline, and a drainage pipeline provided with a drainage valve is preferably arranged on the lower portion of the water storage tank so as to be convenient for maintenance of the water tank.
The second delivery port of storage water tank connect gradually first temperature sensor T1, first solenoid valve V1, third circulating pump P3, third temperature sensor T3 and plate heat exchanger through the water supply line, the plate heat exchanger delivery port divide into two water supply branches, the heating installation of eighth solenoid valve V8, fourth circulating pump P4, user side, the import of twelfth solenoid valve V12 and storage water tank are connected gradually to first water supply branch. The heating device can be a floor radiation type heating heat radiating device as shown in the figure, and the backwater is connected with a twelfth electromagnetic valve V12 and returns to the water storage tank. The second water supply branch is connected with a ninth electromagnetic valve V9, a generator of the lithium bromide absorption refrigerating unit and a water storage tank. Water sent by the second water supply branch returns to the water storage tank through heat exchange of the generator to form a loop. An outlet of an evaporator of the lithium bromide absorption refrigerating unit is sequentially connected with a tenth electromagnetic valve V10, a fifth circulating pump P5, a user side fan coil, an eleventh electromagnetic valve V11 and an inlet of the evaporator of the lithium bromide absorption refrigerating unit through a circulating pipeline; a tap water pipeline provided with a second electromagnetic valve V2 and a second temperature sensor T2 is connected to a water supply line between the first electromagnetic valve V1 and the third circulating pump P3.
The electric heat storage system comprises a first branch which is sequentially connected with a fifth electromagnetic valve V5, a seventh temperature sensor T7, a heat storage water tank, a sixth temperature sensor T6 and a fourth electromagnetic valve V4, and a second branch which is sequentially provided with the sixth electromagnetic valve V6, an electric boiler, a second circulating pump P2 and a seventh electromagnetic valve V7, one end of the first branch which is connected with the fifth electromagnetic valve V5 and one end of the second branch which is connected with the sixth electromagnetic valve V6 are communicated with one end of an electric heat storage circulating pipeline, and the other end of the electric heat storage circulating pipeline is sequentially connected with the fourth temperature sensor T4, the plate heat exchanger, the fifth temperature sensor T5 and the third electromagnetic valve V3 and then is communicated with one end of the first branch which is connected with the fourth electromagnetic valve V4 and one end of the second branch which is connected with the seventh electromagnetic valve V7.
Example 1:
as can be seen from fig. 1, hot water provided by the solar hot water system and the electric boiler heat storage system is directly supplied to the floor radiant heating radiator on the user side to meet the demand of heat supply, i.e., the eighth solenoid valve V8 and the twelfth solenoid valve V12 are opened, the ninth solenoid valve V9, the tenth solenoid valve V10 and the eleventh solenoid valve V11 are closed, and the lithium bromide refrigerator group is closed. The system can provide stable hot water with the temperature of 35-50 ℃ in winter, and the specific operation method comprises the following steps:
when the water level in the water storage tank of the solar water heating system is between the set water level and the highest water level and heat supply is needed, a first electromagnetic valve V1 at the outlet of the water storage tank is opened, hot water in the water storage tank flows out, and the temperature T of outlet water of the water storage tank is detectedGo outMeanwhile, when the sunlight raises the water in the heat collector to a set temperature, the hot water on the upper part of the heat collector flows into the water storage tank, and simultaneously, the solar hot water circulating pump P1 is started to send the low-temperature water at the bottom of the water storage tank into the heat collector, so that the water in the water storage tank is heated circularly. When the water level of the water storage tank is lower than the set water level and the sunlight raises the water in the heat collector to the set temperature, the hot water on the upper part of the heat collector flows into the water storage tank to complete water supplement, meanwhile, a valve of a tap water pipeline is opened to supplement low-temperature tap water into the heat collector, when the sunlight raises the water in the heat collector to the set temperature again, the water is supplemented into the water storage tank again, and then the low-temperature tap water is supplemented into the heat collector. Repeating the steps until the water level of the water storage tank reaches the highest liquid level, and stopping supplying tap water into the heat collector.
1) And when the temperature of water detected by the T1 is higher than 50 ℃, opening the second electromagnetic valve, if the temperature of water detected by the third temperature sensor T3 is higher than 50 ℃, opening degree of the second electromagnetic valve V2 is increased, and if the temperature of water detected by the third temperature sensor T3 is lower than 35 ℃, opening degree of the second electromagnetic valve V2 is decreased, so that the temperature of water is controlled between 35 ℃ and 50 ℃ all the time, and then the water is supplied to the user side floor radiation type heating system.
2) When the T1 detects that the temperature is any temperature within the range of 35 ℃, 40 ℃ and 35-50 ℃, such as 40 ℃ and the like, the first electromagnetic valve V1 is opened, the second electromagnetic valve V2 is closed, and the solar water heating system directly heats the tail-end floor radiation type heating system.
3) When the temperature detected by the T1 is less than 30 ℃, the first electromagnetic valve V1 is opened, the second electromagnetic valve V2 is closed, and meanwhile, the electric heat storage boiler system is started to provide hot water with enough temperature, and heat is provided for water at the outlet of the water storage tank through the plate heat exchanger, so that the heating requirement is ensured.
When the outdoor cold load is low and the electric boiler is in the valley electricity price period, the electric boiler stores heat and simultaneously supplies heat: the third solenoid valve V3, the fifth solenoid valve V5, the sixth solenoid valve V6, and the seventh solenoid valve V7 are opened, and the opening degree of the fourth solenoid valve V4 is adjusted according to the temperature of the fifth temperature sensor T5.
Secondly, when the temperature sensor T7 measures the hot water temperature of the heat storage water tank to meet the requirement and is in the period of valley electricity price, the electric boiler independently supplies heat: the fourth and fifth solenoid valves V4, V5 are closed, and the third, sixth, and seventh solenoid valves V3, V6, V7 are opened.
And thirdly, when solar energy water heating energy meets the heat supply requirement and is in the period of valley electricity price, the electric boiler is only used for heat storage: the third solenoid valve V3 valve is closed, and the fourth, fifth, sixth, and seventh solenoid valves V4, V5, V6, and V7 are opened.
When the system is in the peak electricity price period, the heat storage water tank independently supplies heat: the sixth solenoid valve V6 is closed, the seventh solenoid valve V7 is closed, the third solenoid valve V3 is opened, the fourth solenoid valve V4 is opened, and the fifth solenoid valve V5 is opened.
When the outdoor cold load is lower and in the period of peak electricity price, the fifth temperature sensor T5 detects that the water supply temperature of the heat storage water tank can not meet the requirement, then the electric boiler is used for independent heat supply: the fourth and fifth solenoid valves V4, V5 are closed, and the third, sixth, and seventh solenoid valves V3, V6, V7 are opened.
The outlet water of the water storage tank after being controlled in winter enters the floor radiation type tail end heating system at the user side through the eighth electromagnetic valve V8 and the fourth circulating pump V4 for sufficient heat exchange, and then returns to the water storage tank of the solar water heating system through the twelfth electromagnetic valve V12 as return water.
The method effectively utilizes the peak-valley electricity price difference of the Jingjin and other places to save the operating cost while providing stable and reliable tail end hot water, and fully utilizes the clean energy of solar energy to reduce the power consumption of the whole system.
Example 2:
as can be seen from fig. 1, hot water provided by the solar water heating system and the electric boiler heat storage system is directly supplied to the generator of the lithium bromide absorption refrigeration unit as heat source water, and the fan coil at the user side exchanges heat with the evaporator of the lithium bromide absorption refrigeration through another loop to meet the requirement of cooling, that is, the ninth electromagnetic valve V9, the tenth electromagnetic valve V10 and the eleventh electromagnetic valve V11 are opened, the eighth electromagnetic valve V8 and the twelfth electromagnetic valve V12 are closed, and the lithium bromide refrigeration unit is opened at the same time. The system can provide stable cold water in summer, and the specific operation method comprises the following steps:
when the water level in the water storage tank of the solar water heating system is between the set water level and the highest water level and cold supply is needed, a first electromagnetic valve V1 at the outlet of the water storage tank is opened, hot water in the water storage tank flows out, and the temperature T of outlet water of the water storage tank is detectedGo outMeanwhile, when the sunlight raises the water in the heat collector to a set temperature, the hot water on the upper part of the heat collector flows into the water storage tank, and simultaneously, the solar hot water circulating pump P1 is started to send the low-temperature water at the bottom of the water storage tank into the heat collector, so that the water in the water storage tank is heated circularly. When the water level of the water storage tank is lower than the set water level and the sunlight raises the water in the heat collector to the set temperature, the hot water at the upper part of the heat collector flows into the water storage tank to complete water supplement, meanwhile, a valve of a tap water pipeline is opened to supplement low-temperature tap water into the heat collector, when the sunlight raises the water in the heat collector to the set temperature again, the water is supplemented into the water storage tank again, and then the low-temperature tap water is supplemented into the heat collector againAnd (3) water. Repeating the steps until the water level of the water storage tank reaches the highest liquid level, and stopping supplying tap water into the heat collector.
1) And when the temperature detected by the T1 is higher than 75 ℃, opening the second electromagnetic valve, if the water temperature detected by the third temperature sensor T3 is higher than 75 ℃, opening degree of the second electromagnetic valve V2 is increased, and if the water temperature detected by the third temperature sensor T3 is lower than 60 ℃, opening degree of the second electromagnetic valve V2 is decreased, so that the water temperature is controlled between 60 ℃ and 75 ℃ all the time, and the water is used as a working heat source to be supplied to the lithium bromide refrigerating unit generator.
2) When the T1 detection temperature is at 60 ℃, 75 ℃ and any temperature within the range of 60-75 ℃, such as 70 ℃, the first electromagnetic valve V1 is opened, the second electromagnetic valve V2 is closed, and the first electromagnetic valve is directly used as a working heat source to be supplied to the lithium bromide refrigerating unit generator.
3) When the temperature detected by T1 is less than 60 ℃, the first electromagnetic valve V1 is opened, the second electromagnetic valve V2 is closed, and meanwhile, the electric heat storage boiler system is started to provide hot water with sufficient temperature, heat is provided for outlet water of the water storage tank through the plate heat exchanger, and the hot water is used as a working heat source to be provided for the lithium bromide refrigerating unit generator.
When the outdoor cold load is low and the electric boiler is in the valley electricity price period, the electric boiler stores heat and simultaneously supplies heat: the third solenoid valve V3, the fifth solenoid valve V5, the sixth solenoid valve V6, and the seventh solenoid valve V7 are opened, and the opening degree of the fourth solenoid valve V4 is adjusted according to the temperature of the fifth temperature sensor T5.
Secondly, when the temperature sensor T7 measures the hot water temperature of the heat storage water tank to meet the requirement and is in the period of valley electricity price, the electric boiler independently supplies heat: the fourth and fifth solenoid valves V4, V5 are closed, and the third, sixth, and seventh solenoid valves V3, V6, V7 are opened.
And thirdly, when solar energy water heating energy meets the heat supply requirement and is in the period of valley electricity price, the electric boiler is only used for heat storage: the third solenoid valve V3 valve is closed, and the fourth, fifth, sixth, and seventh solenoid valves V4, V5, V6, and V7 are opened.
When the system is in the peak electricity price period, the heat storage water tank independently supplies heat: the sixth solenoid valve V6 is closed, the seventh solenoid valve V7 is closed, the third solenoid valve V3 is opened, the fourth solenoid valve V4 is opened, and the fifth solenoid valve V5 is opened.
When the outdoor cold load is lower and in the period of peak electricity price, the fifth temperature sensor T5 detects that the water supply temperature of the heat storage water tank can not meet the requirement, then the electric boiler is used for independent heat supply: the fourth and fifth solenoid valves V4, V5 are closed, and the third, sixth, and seventh solenoid valves V3, V6, V7 are opened.
In summer, the water at the outlet of the water storage tank after being controlled enters a generator of the lithium bromide absorption refrigerating unit for heat exchange through a ninth electromagnetic valve V9, and then returns to the water storage tank of the solar water heating system as return water. In the other loop connected with the evaporator of the lithium bromide absorption refrigerating unit, low-temperature outlet water after heat exchange with the evaporator enters a fan coil at a user side through a tenth electromagnetic valve V10 and a fifth circulating pump P5 for heat exchange, and then returns to the lithium bromide absorption refrigerating unit for refrigeration as return water through an eleventh electromagnetic valve V11, and the return water is continuously circulated to provide required cold energy.
The method effectively utilizes the peak-valley price difference of the Jingjin and other places to save the operating cost while providing stable and reliable cold water, fully prolongs the service time of solar energy, and utilizes the solar energy for refrigeration to reduce the power consumption of the whole system.

Claims (1)

1. An operation method of a multi-energy complementary cooling and heating unit is characterized by comprising the following steps:
when the water level in the water storage tank is between the set water level and the highest water level and cold supply or heat supply is needed, a valve at the outlet of the water storage tank is opened, hot water in the water storage tank flows out, and the temperature T of outlet water of the water storage tank is detectedGo outMeanwhile, when the sunlight raises the water in the heat collector to a set temperature, the hot water at the upper part of the heat collector flows into the water storage tank, and meanwhile, the low-temperature water at the bottom of the water storage tank is sent into the heat collector, so that the water in the water storage tank is heated circularly; when the water level of the water storage tank is lower than the set water level, the solar water heating system maintains the constant temperature and supplements water to ensure that the water storage tank of the solar water heating system is at the normal water level;
the solar water heating system comprises a water storage tank and a solar heat collector, and the solar water heating system performs constant temperature water supplement and comprises the following specific steps:
when the water level of the water storage tank is lower than a set water level, when the sunlight raises the water of the heat collector to a set temperature, the hot water on the upper part of the heat collector flows into the water storage tank to replenish water, and meanwhile, low-temperature tap water is replenished into the heat collector, when the sunlight raises the water of the heat collector to the set temperature again, the water is replenished into the water storage tank again, and the steps are repeated until the water level of the water storage tank reaches the highest liquid level, and the tap water is stopped being replenished into;
the hot water in the water storage tank is controlled by the following three methods after flowing out:
controlling the first time in winter when T is reachedGo outWhen the temperature is 35-50 ℃, the water at the outlet of the water storage tank is used as ground heating water to be supplied to a heating device at a user side, and the water can be used as a radiating and heat-dissipating tail end of a floor; in summer, when TGo outWhen the temperature is 60-75 ℃, the water at the outlet of the water storage tank is used as heat source water and is sent into a lithium bromide absorption refrigerating unit;
controlling the second time when T is in winterGo out>At 50 ℃, the water at the outlet of the water storage tank is mixed with the tap water to form mixed water so that the temperature T of the mixed water isMixing ofWhen the temperature is 35-50 ℃, the water is used as ground heating water to be supplied to a heating device at a user side; in summer, when TGo out>At 75 ℃, the water at the outlet of the water storage tank is mixed with tap water to form mixed water as heat source water to enable the T to be heatedMixing ofFeeding the mixture into a lithium bromide absorption refrigerating unit at the temperature of 60-75 ℃;
controlling the third time when T is reached in winterGo out<At 35 ℃; in summer, when TGo out<At 60 deg.C, the flow rate of tap water mixed with outlet water of water storage tank is reduced, so that the temp. of mixed water and water can be respectively held at T set in control oneGo outWinter value range and summer value range; if the tap water is stopped from being mixed into the outlet water of the water storage tank, the T time in winter still cannot be ensuredGo outT is 35-50 ℃ in summerGo outThe method comprises the following steps of starting an electric heat storage system at 60-75 ℃, wherein the electric heat storage system comprises an electric boiler and a heat storage water tank, and the specific control steps are as follows: (1) when the electricity price is in a valley period, the electric boiler is opened, part of hot water at the outlet of the electric boiler enters the heat storage water tank, and water with lower temperature at the lower part of the heat storage water tank returns toThe electric boiler is used for circularly heating, the other part of hot water at the outlet of the electric boiler flows through the plate heat exchanger as a heat source to exchange heat with the outlet water of the water storage tank, so that the outlet water of the water storage tank forms heat exchange water, and the water temperature T of the heat exchange water in winterChangeable pipeWhen the temperature is 35-50 ℃, the water is used as ground heating water to be supplied to a heating device at a user side; in summer, the temperature T of the heat exchange waterChangeable pipeFeeding the water serving as heat source water into a lithium bromide absorption refrigerating unit at the temperature of 60-75 ℃; if the temperature of the heat storage water tank reaches a set value, all hot water generated by the electric boiler is used for heat exchange of the plate heat exchanger; (2) when the peak electricity price period is in, firstly, the heat storage water tank is started to provide hot water for the plate heat exchanger, the hot water in the heat storage water tank continuously circulates through the plate heat exchanger to heat water at the outlet of the water storage tank, when the temperature of the water provided by the heat storage water tank is lower than a set value, the heat storage water tank stops water outlet, the electric boiler is opened, the water outlet of the electric boiler provides a required heat source for the plate heat exchanger, and the peak-valley electricity price difference is effectively utilized;
controlling the water at the outlet of the water storage tank after the heat dissipation of the heating device at the user side in the first, second and third steps as return water to flow back to the water storage tank of the solar water heating system in winter; in summer, controlling the water at the outlet of the water storage tank, which is used as a working heat source and subjected to heat exchange by the lithium bromide absorption refrigerating unit in the first, second and third modes, to flow back to the water storage tank of the solar water heating system, and in the other loop connected with the evaporator of the lithium bromide absorption refrigerating unit, after the heat of the low-temperature refrigerant water subjected to heat exchange with the evaporator is radiated by a fan coil device at the user side, the low-temperature refrigerant water serving as return water flows into the evaporator of the lithium bromide refrigerating unit for continuous refrigeration and continuous circulation to provide cold energy indoors.
CN201810573941.2A 2018-06-06 2018-06-06 Operation method of multi-energy complementary cooling and heating unit Expired - Fee Related CN108800272B (en)

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KR20130137786A (en) * 2012-06-08 2013-12-18 (주) 씨테크놀로지시스템 Heating/cooling system by waste heat of fuel cell : trigeneration
CN204026831U (en) * 2014-07-22 2014-12-17 李树胜 Constant temperature directly-heated solar water system
CN204923181U (en) * 2015-08-12 2015-12-30 北京君盛能源科技有限公司 Novel multi -functional electric boiler of environmental protection energy storage
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