CN117287923A - Triple co-generation system based on PV/T coupling ground source heat pump - Google Patents

Triple co-generation system based on PV/T coupling ground source heat pump Download PDF

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Publication number
CN117287923A
CN117287923A CN202311366128.5A CN202311366128A CN117287923A CN 117287923 A CN117287923 A CN 117287923A CN 202311366128 A CN202311366128 A CN 202311366128A CN 117287923 A CN117287923 A CN 117287923A
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China
Prior art keywords
valve
heat
water tank
water
temperature
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CN202311366128.5A
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Chinese (zh)
Inventor
严祯荣
李爽爽
钟布依
廖飞龙
王莉
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Shanghai University of Engineering Science
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Shanghai University of Engineering Science
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Priority to CN202311366128.5A priority Critical patent/CN117287923A/en
Publication of CN117287923A publication Critical patent/CN117287923A/en
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    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D31/00—Other cooling or freezing apparatus
    • F25D31/005—Combined cooling and heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
    • F22B33/18—Combinations of steam boilers with other apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
    • 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
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/40—Thermal components
    • H02S40/44—Means to utilise heat energy, e.g. hybrid systems producing warm water and electricity at the same time

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

Abstract

The invention relates to a triple co-generation system based on a PV/T coupling ground source heat pump, which comprises a PV/T heat collector, a water tank, a low-temperature power generation loop, a ground buried pipe, a heat pump unit, a water pump and a valve, wherein the PV/T heat collector is arranged on the water tank; the method also comprises the following multiple branches: a heating branch for providing heat to a user in winter; a refrigeration branch for providing cooling capacity for users in summer; the low-temperature power generation branch is used for recovering the system waste heat to perform low-temperature power generation; a power supply branch circuit for supplying power to users all the year round; a hot water supply branch for supplying hot water to users throughout the year; a heat exchange branch circuit for exchanging heat between the user room and the underground; heat supplementing branch: solar energy is utilized to supplement heat to the underground in spring and autumn. Compared with the prior art, the solar energy and geothermal energy are better combined together, so that the refrigeration in summer and the heating in winter are realized, and the power supply and the hot water supply are realized all the year round; the problem of 'cold and hot accumulation' of a ground source heat pump is solved, waste heat is recovered for low-temperature power generation, and the step utilization of energy and the high-efficiency operation of a system are realized; ensuring the thermal balance of the soil. And sustainable and efficient operation is realized.

Description

Triple co-generation system based on PV/T coupling ground source heat pump
Technical Field
The invention relates to the technical field of solar energy and the technical field of ground source heat pumps, in particular to a triple co-generation system based on a PV/T coupling ground source heat pump.
Background
The solar photovoltaic/thermal (PV/T) technology combines photovoltaics and photo-heat by using a PV/T heat collector, a photovoltaic panel of the PV/T heat collector directly converts solar energy into electric energy, a backboard high-heat-conduction pipeline collects the solar energy, on one hand, the surface temperature of the photovoltaic panel is reduced, the photovoltaic power generation efficiency is improved, and on the other hand, heat energy is provided for users.
The low-temperature waste heat power generation technology is characterized in that waste heat of a collecting system is used for heating a low-boiling point working medium, so that the low-boiling point working medium is vaporized into a low-boiling point steam working medium, and the low-boiling point working medium enters a generator set to convert heat energy into electric energy.
The ground source heat pump system can realize summer refrigeration, winter heating, annual power supply and hot water supply, and is an energy-saving technology which utilizes renewable energy and is relatively popularized. Due to the slow heat dissipation rate of the soil, the temperature of the soil around the buried pipe is increased during summer operation, and thermal accumulation is formed. In order to solve the problem, besides the traditional method of adding a cooling tower for auxiliary heat dissipation, the waste heat can be recovered to provide domestic hot water and be used for low-temperature power generation. The ground source heat pump provides cold and hot loads in summer hot and winter cold areas quite, but the ground source heat pump also provides annual hot water, so that annual accumulated heat of the buried pipe is far greater than summer heat accumulation, and the soil temperature is reduced year by year to form 'cold accumulation'.
The patent CN110057008A discloses a system for integrating cold, heat and electricity into a whole and integrating PV/T and a ground source heat pump, which comprises a water chilling unit, a buried pipe, a solar photovoltaic panel, a water tank and a fan coil arranged indoors, wherein an evaporator of the water chilling unit is connected with the fan coil, a condenser of the water chilling unit is connected with the buried pipe, a back copper pipe of the solar photovoltaic panel is connected with the water tank, and the buried pipe is connected with the back copper pipe of the solar photovoltaic panel and the water tank; the solar photovoltaic panel is electrically connected with indoor electrical appliances, and the water tank is connected with a water supply pipeline leading to the indoor. However, the technical effects of waste heat recovery and low-temperature power generation cannot be achieved, and the poly-generation of waste heat recovery, low-temperature power generation, PV power generation, refrigeration, heating, hot water supply and the like cannot be achieved at the same time, so that the thermal accumulation of soil in summer and the cold accumulation in winter are improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a triple supply system based on a PV/T coupling ground source heat pump, which realizes cooling in summer and heating in winter, and supplies power and hot water all the year round; the problem of 'cold and hot accumulation' of a ground source heat pump is solved, waste heat is recovered for low-temperature power generation, and the step utilization of energy and the high-efficiency operation of a system are realized; ensuring the thermal balance of the soil. And sustainable and efficient operation is realized.
The aim of the invention can be achieved by the following technical scheme:
the invention provides a triple co-generation system based on a PV/T coupling ground source heat pump, which comprises a PV/T heat collector, a water tank, a low-temperature power generation loop, a ground buried pipe and a heat pump unit, wherein the water tank is connected with the ground buried pipe;
the water tank comprises a medium-temperature water tank and a high-temperature water tank which are connected in sequence, and the PV/T heat collector, the high-temperature water tank and the medium-temperature water tank are connected in sequence;
the PV/T heat collector comprises a photovoltaic panel and a heat collector, wherein a solar photovoltaic cell on the photovoltaic panel converts sunlight into electric energy, and the heat collector below the photovoltaic panel converts solar energy absorbed by the photovoltaic panel into heat energy through a heat conducting material for power supply application or storage in the battery. The PV/T heat collector converts a part of solar energy into electric energy, and the storage battery provides the electric energy for a user; on the other hand, solar energy is converted into heat energy, water in the medium-temperature water tank is heated, and then the heat energy is conveyed into the high-temperature water tank; the medium-temperature water tank is connected with the water user through a valve, and the high-temperature water tank is connected with the water user to provide domestic hot water for the water user;
the low-temperature power generation loop comprises a low-boiling point liquid medium cavity, a power generation unit, a heating component, a waste heat storage movable chamber, a movable baffle and a waste heat recovery pipe, wherein a heat exchange medium in the low-temperature power generation loop is heated and warmed through a high-temperature water tank, enters the low-boiling point liquid medium cavity, is heated and gasified through the heating component and enters the power generation unit to deliver electric energy to a user, the heat exchange medium enters the waste heat storage movable chamber, and reenters the high-temperature water tank through the waste heat recovery pipe, and the movable baffle is arranged on the waste heat storage movable chamber and can move in the waste heat storage movable chamber;
the heat pump unit exchanges heat with the outside through three heat exchange loops, wherein the heat pump unit is communicated with a user through a first heat exchange loop and is used for heating or refrigerating; the second heat exchange loop is communicated with the buried pipe and is used for absorbing heat or dissipating heat from soil; the third heat exchange loop is communicated with the high-temperature water tank and is used for exchanging heat with the high-temperature water tank.
Further, the water pump module comprises a first water pump, a second water pump and a third water pump, and the valve module comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve and a twelfth valve.
Further, the heat pump unit comprises a condenser, a throttle valve, an evaporator and a compressor, wherein a cooling water channel of the condenser, the throttle valve, a chilled water channel of the evaporator and the compressor are sequentially connected through pipelines.
Further, in the first heat exchange loop, the water channel inlet of the evaporator is connected with the outlet of the third water pump through a fourteenth valve, in the second heat exchange loop, the water channel inlet of the evaporator is connected with the outlet of the buried pipe through an eighth valve and a tenth valve, in the third heat exchange loop, the water channel outlet of the evaporator is connected with the inlet of the second water pump through a seventh valve, and the fourth valve is connected with the high-temperature water tank.
Further, in the first heat exchange loop, the water channel outlet of the evaporator is connected with the user inlet through an eleventh valve, and in the second heat exchange loop, the water channel inlet of the condenser is connected with the buried pipe outlet through an eighth valve and a ninth valve.
Further, in the first heat exchange loop, the water channel inlet of the condenser is connected with the outlet of the third water pump through a thirteenth valve, the inlet of the third water pump is connected with the user, the water channel outlet of the condenser is connected with the user inlet through a twelfth valve, in the second heat exchange loop, the water channel outlet of the condenser is connected with the second water pump through a fifth valve, the outlet of the second water pump is connected with the buried pipe inlet through a sixth valve, in the third heat exchange loop, the outlet of the second water pump is connected with the high-temperature water tank through a fourth valve, and the water channel outlet of the condenser is connected with the high-temperature water tank through a third valve and a fifth valve.
Further, the medium-temperature water tank is provided with a water supplementing port and is connected with a water supplementing pipe.
Further, the heat exchange medium in the low-temperature power generation circuit uses a low-boiling point fluid medium.
Further, the water pumps are circulating pumps.
Further, the valves are all flow regulating valves.
Working principle:
the operation modes in summer day and night are respectively:
1. daytime running mode:
starting a heat pump unit, conveying chilled water generated by an evaporator to a user through an eleventh valve, refrigerating the user, and returning water after the chilled water is heated and warmed to flow back to the evaporator through a third water pump and a fourteenth valve; part of cooling water generated by the condenser is conveyed to the high-temperature water tank through the fifth valve, the second water pump and the fourth valve, exchanges heat with the high-temperature water tank and then flows back to the condenser through the eighth valve and the ninth valve, and the other part of cooling water is conveyed to the buried pipe through the fifth valve, the second water pump and the sixth valve, exchanges heat with soil and then flows back to the condenser through the eighth valve and the ninth valve. At this time, the third valve, the seventh valve, the tenth valve, the twelfth valve and the thirteenth valve are closed.
The refrigerant in the evaporator absorbs heat from the external environment, evaporates it and converts it into a gaseous state, which is then compressed by the compressor through a pipe, increases its temperature and pressure, and then enters the condenser. In the condenser, the refrigerant releases heat, condensing it into a liquid state. At this point, the condenser passes heat into the buried pipe. The condensed liquid refrigerant enters the evaporator through the throttle valve, and the cycle is restarted. During the period, the third valve, the fourth valve, the seventh valve, the tenth valve, the twelfth valve and the thirteenth valve are all closed, so that the refrigerating function is realized.
The PV/T heat collector converts a part of solar energy into electric energy, and the storage battery provides the electric energy for a user; on the other hand, solar energy is converted into heat energy, and water in the medium-temperature water tank is conveyed to the high-temperature water tank through a back plate pipeline and then a first water pump; the high-temperature water tank provides domestic hot water for a user through a first valve, and the flow is as follows: the outlet of the medium-temperature water tank, the PV/T heat collector, the first water pump, the high-temperature water tank, the inlet of the medium-temperature water tank, the outlet of the medium-temperature water tank, which is additionally arranged, is connected with a water pipe through a second valve to supply hot water to a user. The power supply and hot water supply functions are realized.
And the low-temperature power generation loop heats and heats the low-boiling-point liquid medium through a high-temperature water tank, enters a low-boiling-point liquid medium cavity, enters a generator set through heating vaporization of a heating component, transmits electric energy to a user, enters a waste heat storage movable chamber, and reenters the high-temperature water tank through a waste heat recovery pipe. Realizing the low-temperature power generation function. The hot water in the high temperature water tank is used to heat the low boiling point liquid medium, which heats the low boiling point liquid medium, and the heated low boiling point liquid medium enters the low boiling point liquid medium cavity and is heated by the heating member. This process will vaporize the low boiling point liquid medium and turn it into a vapor. The generated steam enters a generator set, the heat energy of the steam is converted into electric energy through the generator set, and then the electric energy is transmitted to a user for use. The steam becomes waste heat after power generation and is sent to the waste heat storage activity chamber. In the waste heat storage activity room, waste heat can be stored and recycled. The waste heat is re-conveyed to the high-temperature water tank through the waste heat recovery pipe so as to continuously heat the low-boiling-point liquid medium.
2. Night operation mode:
the functions of refrigeration, hot water supply, power supply and low-temperature power generation are the same as the above.
The running modes in the daytime and at night in winter are respectively as follows:
1. daytime running mode:
the functions of power supply, hot water supply and low-temperature power generation are the same as the above. The heating heat load is provided by the ground source heat pump according to working conditions. And starting the heat pump unit, conveying cooling water generated by the condenser to a user through a twelfth valve, radiating, refluxing to the condenser through a third water pump and a thirteenth valve, conveying chilled water generated by the evaporator to a buried pipe through a seventh valve, a second water pump and a sixth valve, and refluxing to the evaporator through an eighth valve and a tenth valve after absorbing heat. At this time, the third valve, the fourth valve, the fifth valve, the ninth valve, the eleventh valve and the fourteenth valve are closed. When the solar water heater is insufficient, solar energy can be adopted for assisting heating, the fourth valve is opened, chilled water of the evaporator flows through the high-temperature water tank through the seventh valve, the second water pump and the fourth valve, exchanges heat with the high-temperature water tank and flows back to the evaporator through the eighth valve and the tenth valve. Realizing the functions of low-temperature power generation, heating, power supply and hot water supply.
2. Night operation mode:
the functions of heating and low-temperature power generation are the same as above, and the ground source heat pump is used for providing domestic hot water for a low-temperature power generation heat source: and closing the fourth valve, opening the third valve, and enabling the water at the outlet of the buried pipe to exchange heat with the high-temperature water tank through the pipeline, and returning to the inlet of the buried pipe through the third valve, the second water pump and the sixth valve. Realizing the functions of heating, supplying hot water, supplying power and generating electricity at low temperature.
The invention operates in spring and autumn:
the functions of supplying power and supplying hot water are the same as the above. During the running period of the ground source heat pump, the ground source heat pump bears indoor heating, hot water supply and low-temperature power generation heat load higher than the heat absorbed by soil in summer, the problem of 'cold accumulation' of the soil is caused after winter, a soil heat storage mode is started, solar energy preferentially provides domestic water and low-temperature power generation, additional solar energy is stored in the soil through a buried pipe heat exchanger, a third valve, a second water pump and a sixth valve are opened, and a fourth valve, a fifth valve, a seventh valve and an eighth valve are closed.
The switching of each mode of operation is comprehensively considered according to the seasons, the user demands and the change of the soil temperature. The heat dissipated into the soil in the daytime and the low-temperature power generation is performed at night by means of recovering waste heat, so that the problem of heat accumulation of buried pipes in summer is solved. The soil temperature after the whole year operation is recovered through the soil heat storage mode in spring and autumn, so that the soil heat balance is ensured.
Compared with the prior art, the invention has the following advantages:
(1) The invention realizes the recovery of waste heat and low-temperature power generation.
(2) The invention solves the problems of cold accumulation and hot accumulation of soil at the same time.
(3) The invention realizes the heat accumulation of soil in spring and autumn and solves the problem of cold accumulation of soil.
(4) The invention can cool in summer, recover high temperature condensed water waste heat for low temperature power generation, solve the problem of soil heat accumulation, and save initial investment and operation cost without adding cooling tower to assist in heat dissipation.
(5) The invention realizes the poly-generation of refrigeration in summer, heating in winter, annual power supply, hot water supply, waste heat recovery, low-temperature power generation and the like.
(6) The invention realizes the comprehensive utilization of geothermal energy and solar energy and improves the utilization rate of energy and the operation efficiency of the system.
Drawings
Fig. 1 is a schematic diagram of a triple co-generation system implemented by a PV/T coupled ground source heat pump.
Reference numerals: 1: PV/T collector; 2-1: a first valve; 2-2: a second valve; 2-3: a third valve; 2-4: a fourth valve; 2-5: a fifth valve; 2-6: a sixth valve; 2-7: a seventh valve; 2-8: an eighth valve; 2-9: a ninth valve; 2-10: a tenth valve; 2-11: an eleventh valve; 2-12: a twelfth valve; 3-1: a first water pump; 3-2: a second water pump; 3-3: a third water pump; 4-1: a medium temperature water tank; 4-2: a high temperature water tank; 5: a low boiling point liquid medium chamber; 6: a generator set; 7: a heating member; 8: a waste heat storage movable chamber; 9: a movable baffle; 10: a waste heat recovery pipe; 11: a buried pipe; 12-1: a condenser; 12-2: a throttle valve; 12-3: an evaporator; 12-4: a compressor.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. Features such as a part model, a material name, a connection structure, a control method, an algorithm and the like which are not explicitly described in the technical scheme are all regarded as common technical features disclosed in the prior art.
Example 1
The embodiment provides a triple co-generation system based on a PV/T coupling ground source heat pump, and a system for realizing triple co-generation of cold, heat and electricity, comprising a PV/T heat collector 1, a water tank, a low-temperature power generation loop, a buried pipe, a heat pump unit, a water pump module and a valve module.
The heat pump unit is formed by sequentially connecting a condenser 12-1, a throttle valve 12-2, an evaporator 12-3 and a compressor 12-4. The cooling water passage of the condenser 12-1, the throttle valve 12-2, the chilled water passage of the evaporator 12-3, and the compressor 12-4 are connected in sequence by pipes.
The inlet of the evaporator 12-3 is connected with the outlet of the third water pump 3-3 through a fourteenth valve 2-14, the inlet of the evaporator 12-3 is connected with the outlet of the buried pipe 11 through an eighth valve 2-8 and a tenth valve 2-10, the outlet of the evaporator 12-3 is connected with the inlet of the second water pump 3-2 through a seventh valve 2-7, and the fourth valve 2-4 is connected with the high-temperature water tank 4-2.
The outlet of the evaporator 12-3 is connected with the inlet of the user 13 through an eleventh valve 2-11, and the inlet of the condenser 12-1 is connected with the outlet of the buried pipe 11 through an eighth valve 2-8 and a ninth valve 2-9.
The inlet of the condenser 12-1 is connected with the outlet of the third water pump 3-3 through a thirteenth valve 2-13, the outlet of the condenser 12-1 is connected with the second water pump 3-2 through a fifth valve 2-5, the outlet of the condenser 12-1 is connected with the high-temperature water tank 4-2 through the third valve 2-3 and the fifth valve 2-5, the outlet of the condenser 12-1 is connected with the inlet of the user 13 through a twelfth valve 2-12, the inlet of the third water pump 3-3 is connected with the inlet of the user 13, the outlet of the second water pump 3-2 is connected with the inlet of the buried pipe 11 through a sixth valve 2-6, and the outlet of the second water pump 3-2 is connected with the high-temperature water tank 4-2 through a fourth valve 2-4.
The PV/T heat collector 1, the first water pump 3-1, the high-temperature water tank 4-2 and the medium-temperature water tank 4-1 are connected in sequence.
The medium-temperature water tank 4-1 is provided with a water supplementing port and is connected with a water supplementing pipe.
The medium-temperature water tank 4-1 is connected with the water user through a first valve 2-1, and the high-temperature water tank 4-2 is connected with the water user through a second valve 2-2 to provide domestic hot water for the water user.
The low-temperature power generation circuit comprises: the low-boiling-point liquid medium is heated by a high-temperature water tank 4-2, enters the low-boiling-point liquid medium cavity 5, is heated and gasified by the heating component 7, enters the generator set 6, is transmitted to a user, enters the waste heat storage movable chamber 8, and reenters the high-temperature water tank 4-2 by the waste heat recovery pipe 10, wherein the movable baffle 9 is arranged on the waste heat storage movable chamber 8 and can move in the waste heat storage movable chamber 8.
Working principle:
the operation modes in summer day and night are respectively:
1. daytime running mode:
starting a heat pump unit, conveying chilled water generated by an evaporator 12-3 to a user 13 through an eleventh valve 2-11, refrigerating the user 13, and returning water after the chilled water is heated and warmed to flow back to the evaporator 12-3 through a third water pump 3-3 and a fourteenth valve 2-14; part of cooling water generated by the condenser 12-1 is conveyed to the high-temperature water tank 4-2 through the fifth valve 2-5, the second water pump 3-2 and the fourth valve 2-4, exchanges heat with the high-temperature water tank 4-2, flows back to the condenser 12-1 through the eighth valve 2-8 and the ninth valve 2-9, and the other part of cooling water is conveyed to the buried pipe 11 through the fifth valve 2-5, the second water pump 3-2 and the sixth valve 2-6, exchanges heat with soil and flows back to the condenser 12-1 through the eighth valve 2-8 and the ninth valve 2-9. At this time, the third valve 2-3, the seventh valve 2-7, the tenth valve 2-10, the twelfth valve 2-12, and the thirteenth valve 2-13 are closed.
The refrigerant in the evaporator 12-3 absorbs heat of the external environment to evaporate and convert it into a gaseous state, and then the gaseous refrigerant is compressed by the compressor 12-4 through a pipe to raise its temperature and pressure, and then enters the condenser 12-1. In the condenser 12-1, the refrigerant releases heat, condensing it into a liquid state. At this time, the condenser 12-1 passes heat into the buried pipe 11. The condensed liquid refrigerant enters the evaporator 12-3 through the throttle valve 12-2, and the cycle is restarted. During the period, the third valve 2-3, the fourth valve 2-4, the seventh valve 2-7, the tenth valve 2-10, the twelfth valve 2-12 and the thirteenth valve 2-13 are all closed, so that the refrigerating function is realized.
The PV/T heat collector 1 converts a part of solar energy into electric energy, and the electric energy is provided for a user by a storage battery; on the other hand, solar energy is converted into heat energy, and water in the medium-temperature water tank 4-1 is conveyed to the high-temperature water tank 4-2 through a back plate pipeline and then through a first water pump 3-1; the high-temperature water tank 4-2 supplies domestic hot water to a user through the first valve 2-1, and the flow is as follows: the outlet of the medium-temperature water tank 4-1 is connected with the PV/T heat collector 1, the first water pump 3-1 is connected with the inlet of the high-temperature water tank 4-2, the medium-temperature water tank 4-1 is connected with the outlet of the medium-temperature water tank 4-2, and the water pipe is connected with the second valve 2-2 to supply hot water to a user. The power supply and hot water supply functions are realized.
In the low-temperature power generation loop, a low-boiling-point liquid medium is heated and warmed through a high-temperature water tank 4-2, enters a low-boiling-point liquid medium cavity 5, is heated and vaporized through a heating member 7, enters a generator set 6, transmits electric energy to a user, enters a waste heat storage movable chamber 8, and reenters the high-temperature water tank 4-2 through a waste heat recovery pipe 10. Realizing the low-temperature power generation function. The hot water in the high-temperature water tank 4-2 is used to heat the low-boiling point liquid medium, which heats the low-boiling point liquid medium, and the heated low-boiling point liquid medium enters the low-boiling point liquid medium chamber 5 and is heated by the heating member 7. This process will vaporize the low boiling point liquid medium and turn it into a vapor. The generated steam enters the generator set 6, the heat energy of the steam is converted into electric energy through the generator set, and then the electric energy is transmitted to a user for use. The steam becomes waste heat after power generation, and is sent to the waste heat storage activity chamber 8. In the waste heat storage activity chamber 8, waste heat can be stored and recycled. The waste heat is re-transferred to the high temperature water tank 4-2 through the waste heat recovery pipe 10 to continue heating the low boiling point liquid medium.
2. Night operation mode:
the functions of refrigeration, hot water supply, power supply and low-temperature power generation are the same as the above.
The running modes in the daytime and at night in winter are respectively as follows:
1. daytime running mode:
the functions of power supply, hot water supply and low-temperature power generation are the same as the above. The heating heat load is provided by the ground source heat pump according to working conditions. The heat pump unit is started, cooling water generated by the condenser 12-1 is conveyed to the user 13 through the twelfth valve 2-12, after heat dissipation, the cooling water flows back to the condenser 12-1 through the third water pump 3-3 and the thirteenth valve 2-13, chilled water generated by the evaporator 12-3 is conveyed to the ground pipe 11 through the seventh valve 2-7, the second water pump 3-2 and the sixth valve 2-6, and after heat absorption, the cooling water flows back to the evaporator 12-3 through the eighth valve 2-8 and the tenth valve 2-10. At this time, the third valve 2-3, the fourth valve 2-4, the fifth valve 2-5, the ninth valve 2-9, the eleventh valve 2-11, and the fourteenth valve 2-14 are closed. When the solar energy water heater is insufficient, solar energy can be adopted for assisting heating, the fourth valve 2-4 is opened, chilled water of the evaporator 12-3 flows through the high-temperature water tank 4-2 through the seventh valve 2-7, the second water pump 3-2 and the fourth valve 2-4, exchanges heat with the high-temperature water tank 4-2, and flows back to the evaporator 12-3 through the eighth valve 2-8 and the tenth valve 2-10. Realizing the functions of low-temperature power generation, heating, power supply and hot water supply.
2. Night operation mode:
the functions of heating and low-temperature power generation are the same as above, and the ground source heat pump is used for providing domestic hot water for a low-temperature power generation heat source: and closing the fourth valve 2-4, opening the third valve 2-3, and enabling water at the outlet of the buried pipe 11 to exchange heat with the high-temperature water tank 4-2 through a pipeline, and returning to the inlet of the buried pipe 11 through the third valve 2-3, the second water pump 3-2 and the sixth valve 2-6. Realizing the functions of heating, supplying hot water, supplying power and generating electricity at low temperature.
The invention operates in spring and autumn:
the functions of supplying power and supplying hot water are the same as the above. During the running period of the ground source heat pump, the ground source heat pump bears the heat load of indoor heating, hot water supply and low-temperature power generation which is higher than the heat absorbed by soil in summer, the problem of cold accumulation of the soil is caused after winter, a soil heat accumulation mode is started, solar energy preferentially provides domestic water and low-temperature power generation, extra solar energy is stored in the soil through a heat exchanger of a buried pipe 11, a third valve 2-3, a second water pump 3-2 and a sixth valve 2-6 are opened, a fourth valve 2-4, a fifth valve 2-5, a seventh valve 2-7 and an eighth valve 2-8 are closed.
The switching of the operation of each mode is comprehensively considered according to the seasons, the demands of the users 13 and the change of the soil temperature. The heat dissipated into the soil in the daytime and the low-temperature power generation is performed at night by means of recovering waste heat, so that the problem of heat accumulation of the buried pipe 11 in summer is solved. The soil temperature after the whole year operation is recovered through the soil heat storage mode in spring and autumn, so that the soil heat balance is ensured.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.

Claims (10)

1. The triple co-generation system based on the PV/T coupling ground source heat pump is characterized by comprising a PV/T heat collector, a water tank, a low-temperature power generation loop, a ground buried pipe (11) and a heat pump unit;
the water tank comprises a medium-temperature water tank (4-1) and a high-temperature water tank (4-2) which are connected in sequence, and the PV/T heat collector (1) is connected with the high-temperature water tank (4-2) and the medium-temperature water tank (4-1);
the PV/T heat collector (1) converts a part of solar energy into electric energy, a storage battery provides electric energy for a user, and meanwhile, converts a part of solar energy into heat energy, so that water in the medium-temperature water tank (4-1) is heated, and then the water is conveyed into the high-temperature water tank (4-2); the medium-temperature water tank (4-1) is connected with a user, and the high-temperature water tank (4-2) is connected with the user through a valve to provide domestic hot water for the user;
the low-temperature power generation loop comprises a low-boiling-point liquid medium cavity (5), a power generation unit (6), a heating member (7), a waste heat storage movable chamber (8), a movable baffle (9) and a waste heat recovery pipe (10), wherein a heat exchange medium in the low-temperature power generation loop is heated and warmed through the high-temperature water tank (4-2), enters the low-boiling-point liquid medium cavity (5), enters the power generation unit (6) through heating vaporization of the heating member (7), transmits electric energy to a user, enters the waste heat storage movable chamber (8), reenters the high-temperature water tank (4-2) through the waste heat recovery pipe (10), and the movable baffle (9) is arranged on the waste heat storage movable chamber (8) and can displace in the waste heat storage movable chamber (8);
the heat pump unit exchanges heat with the outside through three heat exchange loops, wherein the heat pump unit is communicated with a user (13) through a first heat exchange loop and is used for heating or refrigerating; is communicated with the buried pipe (11) through a second heat exchange loop and is used for absorbing heat or dissipating heat from soil; and the third heat exchange loop is communicated with the high-temperature water tank (4-2) and is used for exchanging heat with the high-temperature water tank (4-2).
2. The triple co-generation system based on the PV/T coupling ground source heat pump according to claim 1, further comprising a water pump module and a valve module, wherein the water pump module comprises a first water pump (3-1), a second water pump (3-2) and a third water pump (3-3), and the valve module comprises a first valve (2-1), a second valve (2-2), a third valve (2-3), a fourth valve (2-4), a fifth valve (2-5), a sixth valve (2-6), a seventh valve (2-7), an eighth valve (2-8), a ninth valve (2-9), a tenth valve (2-10), an eleventh valve (2-11) and a twelfth valve (2-12).
3. The triple co-generation system based on the PV/T coupling ground source heat pump according to claim 2, wherein the heat pump unit comprises a condenser (12-1), a throttle valve (12-2), an evaporator (12-3) and a compressor (12-4), and a cooling water channel of the condenser (12-1), the throttle valve (12-2), a chilled water channel of the evaporator (12-3) and the compressor (12-4) are sequentially connected through pipelines.
4. A triple co-generation system based on a PV/T coupled ground source heat pump according to claim 3, characterized in that in the first heat exchange loop the water channel inlet of the evaporator (12-3) is connected to the outlet of the third water pump (3-3) via a fourteenth valve (2-14), in the second heat exchange loop the water channel inlet of the evaporator (12-3) is connected to the outlet of the buried pipe (11) via an eighth valve (2-8), a tenth valve (2-10), in the third heat exchange loop the water channel outlet of the evaporator (12-3) is connected to the inlet of the second water pump (3-2) via a seventh valve (2-7), and in the fourth valve (2-4) is connected to the high temperature water tank (4-2).
5. A triple co-generation system based on PV/T coupled ground source heat pump according to claim 3, characterized in that in the first heat exchange circuit the water channel outlet of the evaporator (12-3) is connected to the inlet of the user (13) via an eleventh valve (2-11), and in the second heat exchange circuit the water channel inlet of the condenser (12-1) is connected to the outlet of the buried pipe (11) via an eighth valve (2-8), a ninth valve (2-9).
6. A triple co-generation system based on a PV/T coupled ground source heat pump according to claim 3, characterized in that in the first heat exchange loop the water channel inlet of the condenser (12-1) is connected to the third water pump (3-3) inlet via a thirteenth valve (2-13), the third water pump (3-3) inlet is connected to the user (13), the water channel outlet of the condenser (12-1) is connected to the user (13) inlet via a twelfth valve (2-12), in the second heat exchange loop the water channel outlet of the condenser (12-1) is connected to the second water pump (3-2) via a fifth valve (2-5), the second water pump (3-2) outlet is connected to the ground pipe (11) inlet via a sixth valve (2-6), in the third heat exchange loop the second water pump (3-2) outlet is connected to the high temperature water tank (4-2) via a fourth valve (2-4), the condenser (12-1) water channel outlet is connected to the high temperature water tank (4-2) via a fifth valve (2-5).
7. The triple co-generation system based on the PV/T coupling ground source heat pump according to claim 1, wherein the medium temperature water tank (4-1) is provided with a water supplementing port and is connected with a water supplementing pipe.
8. A triple co-generation system based on a PV/T coupled ground source heat pump according to claim 1, wherein the heat exchange medium in the low temperature power generation loop uses a low boiling point fluid medium.
9. The triple co-generation system based on the PV/T coupling ground source heat pump of claim 2, wherein the water pumps are circulation pumps.
10. The triple co-generation system based on the PV/T coupling ground source heat pump of claim 1, wherein the valves are flow regulating valves.
CN202311366128.5A 2023-10-20 2023-10-20 Triple co-generation system based on PV/T coupling ground source heat pump Pending CN117287923A (en)

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CN202311366128.5A CN117287923A (en) 2023-10-20 2023-10-20 Triple co-generation system based on PV/T coupling ground source heat pump

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CN202311366128.5A CN117287923A (en) 2023-10-20 2023-10-20 Triple co-generation system based on PV/T coupling ground source heat pump

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CN117287923A true CN117287923A (en) 2023-12-26

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