CN110195991B - Cross-season hybrid heat storage cold and hot combined supply system - Google Patents
Cross-season hybrid heat storage cold and hot combined supply system Download PDFInfo
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- CN110195991B CN110195991B CN201910595149.1A CN201910595149A CN110195991B CN 110195991 B CN110195991 B CN 110195991B CN 201910595149 A CN201910595149 A CN 201910595149A CN 110195991 B CN110195991 B CN 110195991B
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- 238000005338 heat storage Methods 0.000 title claims abstract description 53
- 230000008859 change Effects 0.000 claims abstract description 49
- 238000005057 refrigeration Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000009825 accumulation Methods 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 18
- 239000003507 refrigerant Substances 0.000 description 14
- 238000004321 preservation Methods 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 6
- 230000004888 barrier function Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 239000002440 industrial waste Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000012782 phase change material Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000001932 seasonal effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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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
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/001—Central heating systems using heat accumulated in storage masses district heating system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24V—COLLECTION, PRODUCTION OR USE OF HEAT NOT OTHERWISE PROVIDED FOR
- F24V30/00—Apparatus or devices using heat produced by exothermal chemical reactions other than combustion
-
- 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
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/005—Devices using other cold materials; Devices using cold-storage bodies combined with heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Other Air-Conditioning Systems (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention discloses a cross-season hybrid heat storage cold and hot combined supply system, which comprises a heat collection unit, a heat storage unit, a refrigeration unit, a cold storage unit, a heat release unit and a cold release unit, and is characterized in that: the third heat exchange coil (4 c) of the heat storage unit is arranged in the phase change heat reservoir (7 a), the phase change heat reservoir (7 a) is buried below the ground (14), and the first buried pipe (12 a) is arranged around the phase change heat reservoir (7 a); a fourth heat exchange coil (4 d) of the refrigeration unit is arranged in the thermochemical reactor (8), and the cold side inlet of the condenser (9) is connected with the first buried pipe (12 a); the fifth heat exchange coil (4 e) of the cold storage unit is arranged in the phase-change cold storage device (7 b), the phase-change cold storage device (7 b) is buried below the ground (14), and the second buried pipe (12 b) is arranged around the phase-change cold storage device (7 b). The energy storage mode is flexible and changeable, the energy storage density is high, the cold and hot combined supply is high, the system efficiency is high, the occupied area can be saved to the greatest extent, the energy consumption of a building is reduced, and the region application range of heat storage across seasons is enlarged.
Description
Technical Field
The invention relates to the technical field of heat storage, in particular to a cross-season hybrid heat storage and cold and hot combined supply system.
Background
The data show that the total energy consumption of the national architecture in 2015 is 8.57 hundred million tons of standard coal, accounting for 20% of the total energy consumption of the national architecture, and more than half of the energy consumption of the architecture comes from heating, ventilation, air conditioning and related systems, and the part of energy consumption structure still takes fossil energy as a main part, thereby aggravating the atmospheric pollution degree of China. Under the background of the situation that the energy supply and demand situation in China is becoming tense and the environment protection is continuously under high pressure, the technical progress and innovation of the heating ventilation air conditioning industry are unprecedented. Renewable energy sources, especially solar energy, geothermal energy, etc., have been widely used in the construction industry. However, the heating ventilation air conditioner in China has remarkable seasonal characteristics in supply and demand, solar energy and waste heat resources in summer are rich, but cannot be effectively utilized, and on the contrary, the solar energy and the waste heat resources in winter are deficient, so that a great amount of heat energy requirements of people are difficult to meet. The seasonal heat storage technology can transfer heat of solar energy, industrial waste heat and the like from summer or transitional seasons to winter, overcomes the defect of unstable short-term heat storage, enlarges the utilization depth and breadth of renewable energy sources, and improves the utilization rate of renewable energy sources.
At present, a cross-season heat storage system mainly comprises a sensible heat storage system, a phase change material latent heat storage system and a thermochemical heat storage system, wherein the sensible heat storage system is safe and pollution-free, has high heat exchange coefficient, low cost and easy equipment maintenance, but has low heat storage density, cannot keep constant temperature, has large heat storage volume and large heat loss, and the most promising is buried pipe heat storage; the heat storage density of the heat storage of the latent heat type phase change material is larger, the temperature of the phase change process is constant, the heat storage volume is smaller, the heat loss is smaller, but the heat exchange coefficient is lower, the risk of equipment corrosion exists, the cost is higher, and the stability is poorer; the thermochemical heat storage system is compact and has the highest heat storage density, but has high cost, complex system, poor heat transfer and mass transfer capability and difficult equipment maintenance. In addition, the traditional cross-season heat storage mainly stores summer heat, meets winter heating requirements, and omits summer refrigeration requirements.
Disclosure of Invention
The invention aims to overcome the defects and provide the cross-season hybrid heat storage and cold and heat combined supply system which has flexible and changeable energy storage modes, high energy storage density, high cold and heat combined supply and high system efficiency, can save the occupied area to the greatest extent, reduce the energy consumption of a building and enlarge the region application range of cross-season heat storage.
The invention relates to a cross-season hybrid heat storage cold and hot combined supply system, which comprises a heat collection unit, a heat storage unit, a refrigeration unit, a cold storage unit, a heat release unit and a cold release unit, wherein:
The heat collection unit comprises a heat collector, a first heat exchange coil, a buffer tank, a first valve and a first pump, wherein the heat collector, the first heat exchange coil, the buffer tank, the first valve and the first pump are sequentially connected through pipelines to complete circulation, and the first heat exchange coil is arranged in the buffer tank;
The heat storage unit comprises a second heat exchange coil, a second valve, a second pump, a first three-way valve, a third heat exchange coil, a phase change heat reservoir, a sixteenth valve, a second three-way valve, a sixth valve, a third valve, a first buried pipe, a seventh valve and a fifth valve. The second heat exchange coil is arranged in the buffer tank, the second heat exchange coil, the second valve, the second pump, the first three-way valve, the third heat exchange coil, the sixteenth valve, the second three-way valve and the second heat exchange coil are sequentially connected through pipelines to complete circulation, and the third heat exchange coil is arranged in the phase change heat reservoir. The other interface of the first three-way valve is sequentially connected with a sixth valve, a third valve, a first buried pipe, a seventh valve and a fifth valve through pipelines, and then is connected with the other interface of the second three-way valve;
The refrigeration unit comprises a seventeenth valve, a seventh pump, an eighteenth valve, a sixth pump, a third three-way valve, a fourth heat exchange coil, a fourth three-way valve, a thermochemical reactor, a ninth valve, a condenser, a liquid storage tank, an evaporator, a tenth valve, a third pump and an eighth valve. The eighteenth valve and the sixth pump are connected in series to form a line, the seventeenth valve and the seventh pump are connected in series to form a line, the two lines are connected in parallel, one end of the seventeenth valve and one end of the seventeenth valve are arranged between the first three-way valve and the sixth valve, the other end of the seventeenth valve is connected with the third three-way valve and then connected with one side of the fourth heat exchange coil, the other side of the fourth heat exchange coil is connected with the fourth three-way valve in a side joint manner, and then connected with a pipeline between the fifth valve and the seventh valve. The fourth heat exchange coil is arranged in the thermochemical reactor. The outlet of the cold side of the condenser is sequentially connected with a third pump and an eighth valve through pipelines, and then connected to the pipeline between the sixth valve and the third valve, and the inlet of the cold side of the condenser is connected with a first buried pipe. The outlet pipeline at the top end of the thermochemical reactor is divided into two branches, one branch is connected with the hot side inlet of the condenser through a ninth valve, the hot side outlet of the condenser is connected with the liquid storage tank, the outlet of the liquid storage tank is connected with the cold side inlet of the evaporator, and the cold side outlet of the evaporator is connected with the other branch of the outlet pipeline at the top end of the thermochemical reactor through a tenth valve;
The cold storage unit comprises a phase change cold storage device, a fifth heat exchange coil, an eleventh valve and an eighth pump, wherein a hot side outlet of the evaporator is connected with the fifth heat exchange coil through a pipeline, then sequentially connected with the eleventh valve and the eighth pump and enters a hot side inlet of the evaporator to complete circulation, and the fifth heat exchange coil is arranged in the phase change cold storage device;
The heat release unit comprises a user, a fourth valve, a fifteenth valve and a fifth pump, wherein the third three-way valve is connected with the fifteenth valve and the fifth pump through pipelines and then is connected with a user heating inlet, and a user heating outlet is connected with the fourth three-way valve. One end of the fourth valve is connected to the pipeline between the second three-way valve and the fifth valve, and the other end of the fourth valve is connected to the pipeline between the third valve and the sixth valve;
The cooling unit comprises a sixth heat exchange coil, a twelfth valve, a fourth pump, a thirteenth valve, a second buried pipe and a fourteenth valve, one side of the sixth heat exchange coil is sequentially connected with the twelfth valve and the fourth pump to enter a user cooling inlet, the user cooling outlet is divided into two branches, one branch returns to the other side of the sixth heat exchange coil through the fourteenth valve, the other branch bypasses the fourteenth valve, enters the second buried pipe through the thirteenth valve and then enters the sixth heat exchange coil to form a bypass. The sixth heat exchange coil is arranged in the phase change cold storage device;
the phase change heat reservoir is buried below the ground, and the first buried pipe is arranged around the phase change heat reservoir;
The phase-change cold storage device is buried below the ground, and the second buried pipe is arranged around the phase-change cold storage device.
Compared with the prior art, the invention has obvious beneficial effects, and the technical scheme can be adopted as follows: the first buried pipe can absorb heat dissipation loss of the phase change heat reservoir to form a heat barrier, and can also absorb condensation heat from a condenser during refrigeration. The phase change heat reservoir can reduce the thickness of the heat preservation layer and even does not take heat preservation measures. The first buried pipe and the phase change heat reservoir form an underground composite heat storage system, and the two heat storage modes are mutually complementary and mutually coordinated. And the second buried pipe is used for absorbing the cooling loss of the phase change cold accumulator and forming a cold barrier. The phase change cold accumulator can reduce the thickness of the heat preservation layer and even does not take heat preservation measures. During heating, when the solar energy is insufficient, the heat release unit can be used for independently heating by the phase change heat reservoir or the first buried pipe according to the requirement, and can also be used for heating by the first buried pipe in series connection with the phase change heat reservoir. The cooling unit can be independently cooled by the phase change cold storage device according to the need during the cooling period, and can also be cooled by the second buried pipe connected in series with the phase change cold storage device, and the second buried pipe plays a role of precooling during the connection. In operation, the evaporation process and the condensation process are alternately performed, and the power source for the working medium flow comes from the pressure difference, so that the requirement on the pump can be reduced. The thermochemical reactor can utilize heat from the heat storage unit when the solar energy is insufficient and the refrigeration requirement exists. The heat required by heat storage and the heat required by refrigeration can be distributed through the valve, the load between the first buried pipe and the phase change heat reservoir and the load between the second buried pipe and the phase change cold reservoir can be distributed in a coordinated manner, and the heat collection, heat storage, refrigeration, cold storage, heat release and cold release operation modes of the system can be configured in a coordinated manner.
The invention combines the phase change heat storage/cold storage, thermochemical heat storage and buried pipe sensible heat storage modes to form a cold and hot combined supply composite energy storage system with various energy storage modes, wherein the energy storage modes are mutually complementary and mutually coordinated, and the invention has the advantages of flexible and changeable energy storage modes, high energy storage density, combined cold and hot supply, high system efficiency and the like, can save floor space to the greatest extent, reduce building energy consumption, expand the region application range of cross-season heat storage, can be used for collecting solar heat, industrial waste heat, waste heat and the like, and has good application prospect. The invention can recycle the waste heat generated in the refrigeration process, has high system efficiency, combines the cooling and heating of the whole system, supplies heat in winter and supplies cold in summer, can reduce the total energy consumption of the building, and is very suitable for areas with heating requirements and refrigerating requirements.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The marks in the figure:
1. A heat collector; 2a, a first pump; 2b, a second pump; 2c, a third pump; 2d, a fourth pump; 2e, a fifth pump; 2f, a sixth pump; 2g, seventh pump; 2h, an eighth pump; 3a, a first valve; 3b, a second valve; 3c, a third valve; 3d, a fourth valve; 3e, a fifth valve; 3f, a sixth valve; 3g, seventh valve; 3h, an eighth valve; 3i, a ninth valve; 3j, tenth valve; 3k, eleventh valve; 3l, twelfth valve; 3m, thirteenth valve; 3n, fourteenth valve; a 3o, fifteenth valve; 3p, sixteenth valve; 3q, seventeenth valve; a 3r eighteenth valve; 4a, a first heat exchange coil; 4b, a second heat exchange coil; 4c, a third heat exchange coil; 4d, a fourth heat exchange coil; 4e, a fifth heat exchange coil; 4f, a sixth heat exchange coil; 5. a buffer tank; 6a, a first three-way valve; 6b, a second three-way valve; 6c, a third three-way valve; 6d, a fourth three-way valve; 7a, a phase change heat reservoir; 7b, a phase change cold storage device; 8. a thermochemical reactor; 9. a condenser; 10. an evaporator; 11. a liquid storage tank; 12a, a first buried pipe; 12b, a second buried pipe; 13. a user; 14. ground surface.
Detailed Description
The invention relates to a cross-season hybrid heat storage cold and hot combined supply system, which comprises a heat collection unit, a heat storage unit, a refrigeration unit, a cold storage unit, a heat release unit and a cold release unit, wherein:
The heat collecting unit comprises a heat collector 1, a first heat exchange coil 4a, a buffer tank 5, a first valve 3a and a first pump 2a, wherein the heat collector 1, the first heat exchange coil 4a, the buffer tank 5, the first valve 3a and the first pump 2a are sequentially connected with the heat collector 1 through pipelines to complete circulation, and the first heat exchange coil 4a is arranged in the buffer tank 5;
The heat storage unit comprises a second heat exchange coil 4b, a second valve 3b, a second pump 2b, a first three-way valve 6a, a third heat exchange coil 4c, a phase change heat reservoir 7a, a sixteenth valve 3p, a second three-way valve 6b, a sixth valve 3f, a third valve 3c, a first buried pipe 12a, a seventh valve 3g and a fifth valve 3e, wherein the second heat exchange coil 4b is arranged in the buffer tank 5, the second heat exchange coil 4b, the second valve 3b, the second pump 2b, the first three-way valve 6a, the third heat exchange coil 4c, the sixteenth valve 3p, the second three-way valve 6b and the second heat exchange coil 4b are sequentially connected through pipelines to complete circulation, and the third heat exchange coil 4c is arranged in the phase change heat reservoir 7 a. The other port of the first three-way valve 6a is sequentially connected with a sixth valve 3f, a third valve 3c, a first buried pipe 12a, a seventh valve 3g and a fifth valve 3e through pipelines, and then is connected with the other port of the second three-way valve 6 b;
The refrigeration unit comprises a seventeenth valve 3q, a seventh pump 2g, an eighteenth valve 3r, a sixth pump 2f, a third three-way valve 6c, a fourth heat exchange coil 4d, a fourth three-way valve 6d, a thermochemical reactor 8, a ninth valve 3i, a condenser 9, a liquid storage tank 11, an evaporator 10, a tenth valve 3j, a third pump 2c and an eighth valve 3h, wherein the eighteenth valve 3r and the sixth pump 2f are connected in series to form a line, the seventeenth valve 3q and the seventh pump 2g are connected in series to form a line, the two lines are connected in parallel, one end of the line is arranged between the first three-way valve 6a and the sixth valve 3f, the other end of the line is connected with the third three-way valve 6c and then connected with one side of the fourth heat exchange coil 4d, the other side of the fourth heat exchange coil 4d is connected with the fourth three-way valve 6d and then connected with a pipeline between the fifth valve 3e and the seventh valve 3 g. A fourth heat exchange coil is placed 4d inside thermochemical reactor 8. The cold side outlet of the condenser 9 is sequentially connected with the third pump 2c and the eighth valve 3h through pipelines, and then connected with the pipeline between the sixth valve 3f and the third valve 3c, and the cold side inlet of the condenser 9 is connected with the first buried pipe 12a. The outlet pipeline at the top end of the thermochemical reactor 8 is divided into two branches, one branch is connected with the hot side inlet of the condenser 9 through a ninth valve 3i, the hot side outlet of the condenser 9 is connected with the inlet of the liquid storage tank 11, the outlet of the liquid storage tank 11 is connected with the cold side inlet of the evaporator 10, and the cold side outlet of the evaporator 10 is connected with the other branch of the outlet pipeline at the top end of the thermochemical reactor 8 through a tenth valve 3 j;
The cold storage unit comprises a phase change cold storage 7b, a fifth heat exchange coil 4e, an eleventh valve 3k and an eighth pump 2h, wherein the hot side outlet of the evaporator 10 is connected with the fifth heat exchange coil 4e through a pipeline, then sequentially connected with the eleventh valve 3k and the eighth pump 2h and enters the hot side inlet of the evaporator 10 to complete circulation, and the fifth heat exchange coil 4e is arranged in the phase change cold storage 7 b;
The heat release unit comprises a user 13, a fourth valve 3d, a fifteenth valve 3o and a fifth pump 2e, wherein the third three-way valve 6c is connected with the fifteenth valve 3o and the fifth pump 2e through pipelines, then is connected with a heating inlet of the user 13, and a heating outlet of the user 13 is connected with the fourth three-way valve 6d. One end of the fourth valve 3d is connected with a pipeline between the second three-way valve 6b and the fifth valve 3e, and the other end of the fourth valve is connected with a pipeline between the third valve 3c and the sixth valve 3 f;
The cooling unit comprises a sixth heat exchange coil 4f, a twelfth valve 3l, a fourth pump 2d, a thirteenth valve 3m, a second buried pipe 12b and a fourteenth valve 3n, one side of the sixth heat exchange coil 4f is sequentially connected with the twelfth valve 3l, the fourth pump 2d enters a cooling inlet of the user 13, the cooling outlet of the user 13 is divided into two branches, one branch returns to the other side of the sixth heat exchange coil 4f through the fourteenth valve 3n, the other branch bypasses the fourteenth valve 3n, enters the second buried pipe 12b through the thirteenth valve 3m, and then enters the sixth heat exchange coil 4f to form a bypass. The sixth heat exchange coil 4f is arranged in the phase change cold storage 7 b;
the phase-change heat reservoir 7a is buried below the ground 14, and the first buried pipe 12a is arranged around the phase-change heat reservoir 7a to form a heat barrier, so that heat dissipation loss of the phase-change heat reservoir 7a can be absorbed, and condensation heat generated during refrigeration of the condenser 9 can be absorbed.
The phase change heat reservoir 7a can reduce the thickness of the heat preservation layer, even without taking heat preservation measures.
The first buried pipe 12a and the phase change heat reservoir 7a form an underground composite heat storage system, and the two heat storage modes are mutually complementary and mutually coordinated.
The phase-change cold storage device 7b is buried below the ground 14, and the second buried pipe 12b is arranged around the phase-change cold storage device 7b to form a cold barrier for absorbing the cooling loss of the phase-change cold storage device 7 b.
The phase change cold store 7b can reduce the thickness of the insulation layer even without taking insulation measures.
The heat release unit can be used for independently supplying heat by the phase change heat reservoir 7a or the first buried pipe 12a or can be used for supplying heat by the first buried pipe 12a in series connection with the phase change heat reservoir 7a when solar energy is insufficient during heating.
During the cooling period, the cooling releasing unit can independently cool the phase change cold storage 7b according to the requirement, or the second buried pipe 12b is connected in series with the phase change cold storage 7b to cool, and the second buried pipe 12b plays a role of precooling when connected in series.
When the refrigerating unit refrigerates, the thermochemical reactor 8 containing the refrigerating working substance pair is used for desorbing and volatilizing the refrigerant in the working substance pair after absorbing heat from the heat collecting unit, the refrigerant enters the condenser 9 to be condensed into liquid state after passing through the ninth valve 3i and is stored in the liquid storage tank 11, and the condensed heat is taken away by the working substance which sequentially flows through the condenser 9, the third pump 2c, the eighth valve 3h and the third valve 3c and is stored in the first buried pipe 12 a; the liquid storage tank 11 is provided with a liquid level meter, when the liquid refrigerant is filled, the thermochemical reactor 8 is started to release heat to absorb the refrigerant, the refrigerant is discharged from the liquid storage tank 11 and enters the evaporator 10 to absorb heat by evaporation, then the refrigerant returns to the thermochemical reactor 8 to be absorbed by the absorbent after passing through the tenth valve 3j, and the heat released by absorption of the thermochemical reactor 8 is taken away by working media flowing through the fourth heat exchange coil 4d, the third three-way valve 6c, the sixth pump 2f, the eighteenth valve 3r, the sixth valve 3f and the third valve 3c in sequence and stored in the first buried pipe 12 a.
In the refrigeration process, the evaporation process and the condensation process are alternately performed, and the power source for the working medium flow is from the pressure difference, so that the requirement on a pump can be reduced.
The thermochemical reactor 8 can use the heat from the heat storage unit when the solar energy is insufficient and there is a need for refrigeration.
The heat collector 1, the phase-change heat storage 7a, the first buried pipe 12a, the thermochemical reactor 8, the phase-change cold storage 7b and the second buried pipe 12b can adjust heat distribution required by heat storage and heat distribution required by refrigeration through valves, can coordinate and distribute loads between the first buried pipe 12a and the phase-change heat storage 7a, loads between the second buried pipe 12b and the phase-change cold storage 7b, and can coordinate and configure heat collection, heat storage, refrigeration, cold storage, heat release and cold release operation modes of the system.
Working principle:
the process of collecting and storing heat energy by the system is as follows:
(1) The working medium in the heat collector 1 collects solar heat and/or industrial waste heat and/or waste heat to raise temperature, then enters the first heat exchange coil 4a, exchanges heat to the buffer tank 5, and returns to the heat collector 1 through the first valve 3a and the first pump 2 a.
(2) The working medium absorbs the heat of the buffer tank 5 in the second heat exchange coil 4b at the other side of the buffer tank 5, is split into two branches at the first three-way valve 6a through the second valve 3b and the second pump 2b, one branch enters the third heat exchange coil 4c to transfer the heat into the phase change heat storage tank 7a, and then returns to the second heat exchange coil 4b through the sixteenth valve 3p and the second three-way valve 6b to form a loop; the other branch enters the first buried pipe 12a to exchange heat to surrounding soil after passing through the sixth valve 3f and the third valve 3c, and then returns to the second heat exchange coil 4b through the seventh valve 3g, the fifth valve 3e and the second three-way valve 6b to form a loop.
(3) The heat into the phase change heat reservoir 7a and the first buried pipe 12a can be distributed in coordination by valves.
The heat collector 1 directly supplies heat, and the refrigerant regeneration process is as follows:
(1) The working medium in the heat collector 1 collects solar heat and/or industrial waste heat and/or waste heat to raise temperature, then enters the first heat exchange coil 4a, exchanges heat to the buffer tank 5, and returns to the heat collector through the first valve 3a and the first pump 2 a.
(2) On the other side of the buffer tank 5, after the working medium absorbs the heat of the buffer tank 5 in the second heat exchange coil 4b, the working medium enters the fourth heat exchange coil 4d to transmit the heat to the thermochemical reactor 8 after passing through the second valve 3b, the second pump 2b, the first three-way valve 6a, the seventeenth valve 3q, the seventh pump 2g and the third three-way valve 6c, and then returns to the second heat exchange coil 4b through the fourth three-way valve 6d, the fifth valve 3e and the second three-way valve 6b to form a loop.
(3) The refrigerating medium in the thermochemical reactor 8 volatilizes the refrigerant after absorbing heat, and the refrigerant enters the condenser 9 to be condensed into liquid state through the ninth valve 3i and enters the liquid storage tank 11.
(4) The heat released by the condenser 9 is taken away by the working fluid from the first buried pipe 12a, and is stored in the soil around the first buried pipe 12a after passing through the third pump 2c, the eighth valve 3h and the third valve 3 c.
When the solar energy is insufficient, the phase change heat reservoir 7a supplies heat, and the refrigerant regeneration process is as follows:
(1) After the working medium absorbs the heat stored in the phase change heat reservoir 7a in the third heat exchange coil 4c, the working medium enters the fourth heat exchange coil 4d to transmit the heat to the thermochemical reactor 8 through the first three-way valve 6a, the seventeenth valve 3q, the seventh pump 2g and the third three-way valve 6c, and then returns to the third heat exchange coil 4c through the fourth three-way valve 6d, the fifth valve 3e, the second three-way valve 6b and the sixteenth valve 3p to form a loop.
(2) The working medium in the thermochemical reactor 8 volatilizes the refrigerant after absorbing heat, and the refrigerant enters the condenser 9 to be condensed into liquid state through the ninth valve 3i and enters the liquid storage tank 11.
(3) The heat released by the condenser 9 is taken away by the working fluid from the first buried pipe 12a, and is stored in the soil around the first buried pipe 12a after passing through the third pump 2c, the eighth valve 3h and the third valve 3 c.
The refrigerant is evaporated and refrigerated, and the cold storage process is as follows:
(1) The thermochemical reactor 8 generates adsorption reaction, released heat is taken away from the first buried pipe 12a through the working medium from the seventh valve 3g and the fourth three-way valve 6d in the fourth heat exchange coil 4d, and then is stored in soil around the first buried pipe 12a to form a loop through the third three-way valve 6c, the sixth pump 2f, the eighteenth valve 3r, the sixth valve 3f and the third valve 3 c.
(2) The liquid refrigerant in the liquid storage tank 11 enters the evaporator 10 to absorb heat due to pressure drop generated by adsorption reaction of the thermochemical reactor 8, and then returns to the thermochemical reactor 8 to perform adsorption reaction with the absorbent through the tenth valve 3 j.
(3) The refrigerating capacity of the evaporator 10, which is generated by evaporating and absorbing heat, is taken away by working medium which is pumped into the evaporator 10 from the fifth heat exchange coil 4e through the eleventh valve 3k and the eighth pump 2h and is stored in the phase-change cold storage 7 b.
The winter heat release and heating process is as follows:
(1) The working medium starts from the first buried pipe 12a, absorbs the heat of the surrounding soil, enters the third heat exchange coil 4c through the third valve 3c, the fourth valve 3d, the second three-way valve 6b and the sixteenth valve 3p, further absorbs the heat of the phase change heat reservoir 7a, and reaches the user 13 after passing through the first three-way valve 6a, the seventeenth valve 3q, the seventh pump 2g, the third three-way valve 6c, the fifteenth valve 3o and the fifth pump 2 e. After the user 13 releases heat and heats, the heat reaches the first buried pipe 12a through the fourth three-way valve 6d and the seventh valve 3g to form a loop.
(2) During the heat release and heating period, the phase change heat storage 7a or the first buried pipe 12a can be used for independently heating according to the load requirement of the user side, and the first buried pipe 12a can also be used for connecting the phase change heat storage 7a in series, and the series heating process is described in (1).
The cooling and supplying process in summer is as follows:
(1) The working medium starts from the second buried pipe 12b, absorbs the cold energy of surrounding soil, enters the sixth heat exchange coil 4f to further absorb the cold energy of the phase-change cold storage 7b, and then reaches the user 13 after passing through the twelfth valve 3l and the fourth pump 2 d. After the user 13 releases the cooling, a circuit is formed through the thirteenth valve 3m to the second buried pipe 12 b.
(2) During the cooling-releasing period, the phase-change cold storage 7b can be used for cooling independently according to the requirement, and the second buried pipe 12b can also be used for cooling by connecting the phase-change cold storage 7b in series. When in series, the second borehole 12b serves as a pre-chill. The serial cooling process is described in (1).
The heat storage process is started in spring, summer or autumn, the refrigeration, cold storage and cold release processes are started in summer cold use peak time, and the heat release process is started in winter heat use peak time.
The processes in the working principle described above are not completely independent and there are several possibilities and possibilities for simultaneous execution of the processes.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any simple modification, equivalent variation and variation of the above embodiment according to the technical matter of the present invention still fall within the scope of the technical scheme of the present invention.
Claims (1)
1. The utility model provides a cold and hot allies oneself with confession system of cross-season hybrid heat accumulation, includes heat collecting unit, heat accumulating unit, refrigerating unit, stores up cold unit, heat releasing unit and releases cold unit, its characterized in that: the heat collection unit comprises a heat collector (1), a first heat exchange coil (4 a), a buffer tank (5), a first valve (3 a) and a first pump (2 a), wherein the heat collector (1), the first heat exchange coil (4 a), the buffer tank (5), the first valve (3 a) and the first pump (2 a) are sequentially connected with the heat collector (1) through pipelines to complete circulation, and the first heat exchange coil (4 a) is arranged in the buffer tank (5);
The heat storage unit comprises a second heat exchange coil (4 b), a second valve (3 b), a second pump (2 b), a first three-way valve (6 a), a third heat exchange coil (4 c), a phase change heat reservoir (7 a), a sixteenth valve (3 p), a second three-way valve (6 b), a sixth valve (3 f), a third valve (3 c), a first ground buried pipe (12 a), a seventh valve (3 g) and a fifth valve (3 e), wherein the second heat exchange coil (4 b) is arranged in a buffer tank (5), the second heat exchange coil (4 b), the second valve (3 b), the second pump (2 b), the first three-way valve (6 a), the third heat exchange coil (4 c), the sixteenth valve (3 p), the second three-way valve (6 b) and the second heat exchange coil (4 b) are sequentially connected through pipelines to complete circulation, and the third heat exchange coil (4 c) is arranged in the phase change heat reservoir (7 a); the other interface of the first three-way valve (6 a) is sequentially connected with a sixth valve (3 f), a third valve (3 c), a first buried pipe (12 a), a seventh valve (3 g) and a fifth valve (3 e) through pipelines, and then is connected with the other interface of the second three-way valve (6 b);
The refrigeration unit comprises a seventeenth valve (3 q), a seventh pump (2 g), an eighteenth valve (3 r), a sixth pump (2 f), a third three-way valve (6 c), a fourth heat exchange coil (4 d), a fourth three-way valve (6 d), a thermochemical reactor (8), a ninth valve (3 i), a condenser (9), a liquid storage tank (11), an evaporator (10), a tenth valve (3 j), a third pump (2 c) and an eighth valve (3 h), wherein the eighteenth valve (3 r) and the sixth pump (2 f) are connected in series to form a line, the seventeenth valve (3 q) and the seventh pump (2 g) are connected in series to form a line, the two lines are connected in parallel, one end of the seventeenth valve (3 q) and the seventh pump (2 g) are arranged between the first three-way valve (6 a) and the sixth valve (3 f), the other end of the seventeenth valve is connected with the third three-way valve (6 c) in a connecting way, one side of the fourth heat exchange coil (4 d) is connected with the other four three-way valve (6 d), and then connected with a pipeline between the fifth valve (3 e) and the seventh valve (3 g); the fourth heat exchange coil (4 d) is arranged in the thermochemical reactor (8); the cold side outlet of the condenser (9) is sequentially connected with a third pump (2 c) and an eighth valve (3 h) through pipelines, and then connected to a pipeline between a sixth valve (3 f) and the third valve (3 c), and the cold side inlet of the condenser (9) is connected with a first buried pipe (12 a); the outlet pipeline at the top end of the thermochemical reactor (8) is divided into two branches, one branch is connected with the hot side inlet of the condenser (9) through a ninth valve (3 i), the hot side outlet of the condenser (9) is connected with the inlet of the liquid storage tank (11), the outlet of the liquid storage tank (11) is connected with the cold side inlet of the evaporator (10), and the cold side outlet of the evaporator (10) is connected with the other branch of the outlet pipeline at the top end of the thermochemical reactor (8) through a tenth valve (3 j);
The cold storage unit comprises a phase change cold storage device (7 b), a fifth heat exchange coil (4 e), an eleventh valve (3 k) and an eighth pump (2 h), wherein a hot side outlet of the evaporator (10) is connected with the fifth heat exchange coil (4 e) through a pipeline, then sequentially connected with the eleventh valve (3 k) and the eighth pump (2 h) and enters a hot side inlet of the evaporator (10) to complete circulation, and the fifth heat exchange coil (4 e) is arranged in the phase change cold storage device (7 b);
the heat release unit comprises a user (13), a fourth valve (3 d), a fifteenth valve (3 o) and a fifth pump (2 e), wherein the third three-way valve (6 c) is connected with the fifteenth valve (3 o) and the fifth pump (2 e) through pipelines, then is connected with a heating inlet of the user (13), and a heating outlet of the user (13) is connected with the fourth three-way valve (6 d); one end of the fourth valve (3 d) is connected with a pipeline between the second three-way valve (6 b) and the fifth valve (3 e), and the other end of the fourth valve is connected with a pipeline between the third valve (3 c) and the sixth valve (3 f);
The cooling unit comprises a sixth heat exchange coil (4 f), a twelfth valve (3 l), a fourth pump (2 d), a thirteenth valve (3 m), a second buried pipe (12 b) and a fourteenth valve (3 n), one side of the sixth heat exchange coil (4 f) is sequentially connected with the twelfth valve (3 l), the fourth pump (2 d) enters a cooling inlet of a user (13), the cooling outlet of the user (13) is divided into two branches, one branch returns to the other side of the sixth heat exchange coil (4 f) through the fourteenth valve (3 n), the other branch bypasses the fourteenth valve (3 n), enters the second buried pipe (12 b) through the thirteenth valve (3 m), and then enters the sixth heat exchange coil (4 f) to form a bypass; the sixth heat exchange coil (4 f) is arranged in the phase change cold storage device (7 b);
Wherein: the phase-change heat reservoir (7 a) is buried below the ground (14), and the first buried pipe (12 a) is arranged around the phase-change heat reservoir (7 a); the phase-change cold storage device (7 b) is buried below the ground (14), and the second buried pipe (12 b) is arranged around the phase-change cold storage device (7 b).
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| EP3862637A1 (en) * | 2020-02-07 | 2021-08-11 | E.ON Sverige AB | A thermal storage assembly and a controller configured to control such an assembly |
| CN111207436B (en) * | 2020-02-17 | 2021-03-30 | 中国科学院工程热物理研究所 | Heat pump electricity storage cogeneration system |
| CN111473534B (en) * | 2020-04-17 | 2021-05-07 | 内蒙古润泰新能源科技有限公司 | Seasonal underground cold and heat storage system |
| CN113390194B (en) * | 2021-06-10 | 2023-01-17 | 苏州正乙丙纳米环保科技有限公司 | Solar energy and geothermal energy comprehensive utilization system with cross-season cooling and heating adjusting function |
| CN114485242B (en) * | 2022-01-28 | 2023-03-28 | 浙江大学 | System and method for utilizing waste heat of cross-season data center based on thermal chemical adsorption energy storage |
| CN114877545B (en) * | 2022-05-16 | 2022-11-29 | 山东省地质矿产勘查开发局第一地质大队（山东省第一地质矿产勘查院） | Hot dry rock and solar energy coupling power generation system and use method thereof |
| CN115176631A (en) * | 2022-06-30 | 2022-10-14 | 潍坊博泰能源科技有限公司 | Solar long-short term coupling heat storage-based multi-energy complementary greenhouse system and method |
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