CN113883580A - Heat storage and supply system of middle-deep geothermal composite air source two-stage heat pump - Google Patents
Heat storage and supply system of middle-deep geothermal composite air source two-stage heat pump Download PDFInfo
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- CN113883580A CN113883580A CN202111319476.8A CN202111319476A CN113883580A CN 113883580 A CN113883580 A CN 113883580A CN 202111319476 A CN202111319476 A CN 202111319476A CN 113883580 A CN113883580 A CN 113883580A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/08—Electric heater
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/11—Geothermal energy
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/123—Compression type heat pumps
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B10/40—Geothermal heat-pumps
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Abstract
The invention relates to a heat storage and supply system of a double-stage heat pump of a middle-deep geothermal composite air source. It has solved prior art design technical problem such as reasonable inadequately. The system comprises a middle-deep layer closed circulation well, wherein the middle-deep layer closed circulation well is connected with at least two high-temperature water source heat pumps in parallel, at least one high-temperature water source heat pump is connected with a low-temperature air source heat pump, at least one high-temperature water source heat pump is connected with a high-temperature hot water heat supply end through an electric heat storage boiler and/or at least one high-temperature water source heat pump in the high-temperature water source heat pumps is directly connected with the high-temperature hot water heat supply end. Has the advantages that: the intermediate-deep geothermal energy is fully utilized as a basic heat source, and an auxiliary air source heat pump and an electric energy storage boiler are used as peak regulation measures; meanwhile, energy is stored by using a high-energy-efficiency system by using peak-valley electricity price difference, so that the operation cost is reduced; and the intermediate-deep geothermal water is used for defrosting the cascade air source heat pump, meanwhile, uninterrupted heating is realized, and the heating efficiency and stability of the system are further improved.
Description
Technical Field
The invention belongs to the technical field of renewable energy equipment, and particularly relates to a heat storage and supply system of a double-stage heat pump of a medium-deep geothermal composite air source.
Background
The technology of the middle-deep geothermal closed type circulating ground source heat pump is characterized in that hot water which is circulated out by heat exchange between a heat exchanger in a middle-deep geothermal well and geothermal heat and is about two kilometers of the middle-deep geothermal well is used as a heat source to enter an evaporator of a high-temperature heat pump unit, and the water supply temperature required by building heating is achieved through the lifting of the high-temperature heat pump unit, so that the building is stably heated. The overlapping type air source heat pump technology is a two-stage heat pump technology, air heat energy which cannot be directly utilized is converted into high-temperature hot water which can be utilized for heating buildings, and the overlapping type air source heat pump technology is applied very mature at present. The heat storage technology is an energy technology which stores heat energy prepared by phase change energy storage materials or valley electricity and is used for daily heating requirements, so that the cost is reduced.
At present, a ground source heat pump and an air source heat pump are integrated to form a heating system, but the two systems are limited to be used in parallel in the form of a heat source, and do not form organic connection, for example, chinese patent literature discloses a heating system combining an air source heat pump and a ground source heat pump [ application number: 201922428248.9]: the system comprises a ground source heat exchange system, a ground source heat pump host machine, a tail end air conditioning system and an air source heat pump host machine. The water outlet of the ground source heat exchange system is connected with the input end of the evaporator of the ground source heat pump host, and the water inlet of the ground source heat exchange system is connected with the output end of the evaporator of the ground source heat pump host; the inlet of the tail end air conditioning system is connected with the output end of the condenser of the ground source heat pump host through an air conditioning water supply pipe, and the outlet of the tail end air conditioning system is connected with the input end of the condenser of the ground source heat pump host through an air conditioning water return pipe; the output end of the air source heat pump host is connected with the downstream end of an air conditioner side water return butterfly valve on an air conditioner water return pipe through a hot water outlet pipe, and the input end of the air source heat pump host is connected with the downstream end of a front air conditioner side water supply butterfly valve on an air conditioner water supply pipe through a cold water inlet pipe.
The air source heat pump and the ground source heat pump are only connected in parallel for use and are mutually standby, the problem of low efficiency or even failure caused by frosting of the air source heat pump cannot be solved under the outdoor working condition that the temperature is lower than minus 20 ℃ in the northern cold region, and meanwhile, the stability of heat supply of the system is not improved by combination of regulation and storage.
Disclosure of Invention
The invention aims to solve the problems, provides a heat storage and supply system of a middle-deep geothermal composite air source two-stage heat pump, aims to realize a multi-energy complementary combined type efficient heat storage and supply system suitable for extremely cold regions, relates to an efficient heat supply system combining a middle-deep geothermal closed type circulating ground source heat pump system and a cascade air source heat pump and an electric heating and storage system, fully utilizes middle-deep geothermal energy as a basic heat source, takes an auxiliary air source heat pump heat storage system as a peak regulation measure, and organically combines the two heat sources to realize more energy-saving and cleaner building heating.
In order to achieve the purpose, the invention adopts the following technical scheme: the heat storage and supply system of the middle-deep geothermal composite air source two-stage heat pump comprises a middle-deep closed circulation well and is characterized in that the middle-deep closed circulation well is connected with at least two high-temperature water source heat pumps in parallel, at least one high-temperature water source heat pump in the high-temperature water source heat pump is connected with a low-temperature air source heat pump, at least one high-temperature water source heat pump in the high-temperature water source heat pump is connected with a high-temperature hot water supply end through an electric heat storage boiler and/or at least one high-temperature water source heat pump in the high-temperature water source heat pump is directly connected with a high-temperature hot water supply end.
In the heat storage and supply system of the intermediate-deep geothermal composite air source two-stage heat pump, the intermediate-deep closed circulation well is connected with the first high-temperature water source heat pump and the second high-temperature water source heat pump in parallel through the intermediate-deep well circulation water pump respectively, and the first high-temperature water source heat pump is connected with the low-temperature air source heat pump through the air source heat pump water pump.
In the heat storage and supply system of the middle-deep geothermal composite air source two-stage heat pump, the high-temperature hot water heat supply end is arranged at one end of a high-temperature hot water heat supply pipeline, the first high-temperature water source heat pump is connected to the high-temperature hot water heat supply pipeline through the first load side one-stage water pump, and the second high-temperature water source heat pump is connected to the high-temperature hot water heat supply pipeline through the second load side one-stage water pump.
In the heat storage and supply system of the intermediate-deep geothermal composite air source two-stage heat pump, the electric heat storage boiler is arranged on the high-temperature hot water heat supply pipeline, a load side two-stage water pump with one end connected with the high-temperature hot water heat supply end is arranged on the high-temperature hot water heat supply pipeline, and the other end of the load side two-stage water pump is connected with the electric heat storage boiler and/or is respectively connected with the first load side one-stage water pump and the second load side one-stage water pump.
In the heat storage and supply system of the intermediate-deep geothermal composite air source two-stage heat pump, the intermediate-deep closed circulation well is connected with the low-temperature air source heat pump and the first high-temperature water source heat pump in parallel respectively, a first valve and a second valve are arranged between the low-temperature air source heat pump and the first high-temperature water source heat pump respectively, the intermediate-deep well circulation water pump is connected between the first valve and the second valve through a third valve, and the intermediate-deep well circulation water pump is connected with the second high-temperature water source heat pump through a fourth valve.
In the heat storage and supply system of the intermediate-deep geothermal composite air source two-stage heat pump, the first load side one-stage water pump is connected with the high-temperature hot water heat supply pipeline through a fifth valve, and the second load side one-stage water pump is connected with the high-temperature hot water heat supply pipeline through a sixth valve.
In the heat storage and heat supply system of the intermediate-deep geothermal composite air source two-stage heat pump, an intermediate-deep geothermal well composite cascade heat pump defrosting and heat supply system is formed among the intermediate-deep closed circulation well, the low-temperature air source heat pump and the first high-temperature water source heat pump.
In the heat storage and heat supply system of the middle-deep geothermal composite air source two-stage heat pump, the middle-deep geothermal well composite cascade heat pump defrosting and heat supply system comprises a circulating water circulating pump connected with a middle-deep closed circulating well through a middle-deep well circulating water pump, an air source heat pump condenser and a water source heat pump evaporator are arranged between the middle-deep well circulating water pump and the circulating water circulating pump through a switching valve assembly, the air source heat pump condenser is connected with the air source heat pump evaporator with a fan through an air source heat pump assembly, one end of the water source heat pump evaporator is connected with the water source heat pump condenser through a water source heat pump compressor, and the water source heat pump condenser is connected with the other end of the water source heat pump evaporator through a water source heat pump expansion valve.
In foretell composite air source doublestage heat-retaining heating system of deep floor geothermol power, the diverter valve subassembly include the first motorised valve that links to each other with deep floor well circulating water pump, first motorised valve link to each other and link to each other through third motorised valve and water source heat pump compressor with air source heat pump condenser through the second motorised valve respectively, just circulating water circulating pump pass through the fourth motorised valve and link to each other with deep floor closed-type circulating well.
In the heat storage and supply system of the intermediate-deep geothermal composite air source two-stage heat pump, the air source heat pump assembly comprises a check valve switching pipeline arranged between an air source heat pump condenser and an air source heat pump evaporator with a fan, the check valve switching pipeline is respectively and sequentially provided with an air source heat pump expansion valve, a filter and a liquid storage device, a four-way reversing valve is further arranged between the air source heat pump condenser and the air source heat pump evaporator with the fan, and the four-way reversing valve is respectively connected with a gas-liquid separator and an air source heat pump compressor.
Compared with the prior art, the invention has the advantages that:
1. the intermediate-deep geothermal energy is fully utilized as a basic heat source, and an auxiliary air source heat pump and an electric energy storage boiler are used as peak regulation measures; meanwhile, energy is stored by using a high-energy-efficiency system by using peak-valley electricity price difference, so that the operation cost is reduced; and the intermediate-deep geothermal water is used for defrosting the cascade air source heat pump, meanwhile, uninterrupted heating is realized, and the heating efficiency and stability of the system are further improved.
2. The system is free from the influence of climate and day and night alternation, is particularly suitable for extremely cold weather working conditions in the northeast, and on the other hand, the heating working conditions of the heating system of the intermediate-deep geothermal heat pump composite air source heat pump and the electric heat storage boiler are particularly suitable for low-temperature severe environment operation, the system is stable in operation, and the energy efficiency is high.
Drawings
FIG. 1 is a schematic temperature diagram of a medium-deep geothermal heat pump according to the present invention under a single heating condition;
FIG. 2 is a schematic temperature diagram of the cascade air source heat pump according to the present invention under a single heat supply condition;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is a schematic temperature diagram of the present invention under a combined heating mode;
FIG. 5 is a schematic temperature diagram of the present invention under a composite defrost condition;
FIG. 6 is a schematic structural diagram of a deep geothermal well composite cascade heat pump defrosting heat supply system according to the present invention;
in the figure: the system comprises a middle-deep layer closed circulation well 1, a middle-deep layer well circulation water pump 11, a high-temperature water source heat pump 2, a first high-temperature water source heat pump 21, a second high-temperature water source heat pump 22, a low-temperature air source heat pump 3, an air source heat pump water pump 31, an electric heat storage boiler 4, a high-temperature hot water heat supply end 5, a high-temperature hot water heat supply pipeline 6, a first load side first-stage water pump 61, a second load side first-stage water pump 62, a load side second-stage water pump 63, a first valve 64, a second valve 65, a third valve 66, a fourth valve 67, a fifth valve 68, a sixth valve 69, a middle-deep layer geothermal well composite overlapping heat pump defrosting heat supply system 7, an air source heat pump evaporator 71 with a fan, a check valve switching pipeline 72, an air source heat pump condenser 73, an air source heat pump expansion valve 74, a filter 75, a liquid storage 76, a four-way reversing valve 77, a gas-liquid separator 78, a heat pump compressor 79, an air source compressor 79, The system comprises a circulating water circulating pump 710, a second electric valve 712, a first electric valve 713, a fourth electric valve 714, a third electric valve 715, a water source heat pump evaporator 717, a water source heat pump compressor 718, a water source heat pump expansion valve 719 and a water source heat pump condenser 720.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 3, the heat storage and supply system of the intermediate-deep geothermal composite air source two-stage heat pump comprises an intermediate-deep closed circulation well 1, wherein the intermediate-deep closed circulation well 1 is connected with at least two high-temperature water source heat pumps 2 in parallel, at least one high-temperature water source heat pump 2 in the high-temperature water source heat pumps 2 is connected with a low-temperature air source heat pump 3, at least one high-temperature water source heat pump 2 in the high-temperature water source heat pumps 2 is connected with a high-temperature hot water supply end 5 through an electric heat storage boiler 4 and/or at least one high-temperature water source heat pump 2 in the high-temperature water source heat pumps 2 is directly connected with the high-temperature hot water supply end 5.
Preferably, the middle-deep closed circulation well 1 is connected in parallel with the first high-temperature water source heat pump 21 and the second high-temperature water source heat pump 22 through the middle-deep well circulation water pump 11, and the first high-temperature water source heat pump 21 is connected with the low-temperature air source heat pump 3 through the air source heat pump 31.
The high-temperature hot water heating end 5 is arranged at one end of the high-temperature hot water heating pipeline 6, the first high-temperature water source heat pump 21 is connected to the high-temperature hot water heating pipeline 6 through the first load side primary water pump 61, and the second high-temperature water source heat pump 22 is connected to the high-temperature hot water heating pipeline 6 through the second load side primary water pump 62.
Preferably, the electric heat storage boiler 4 is disposed on the high-temperature hot water supply pipeline 6, a load side secondary water pump 63 with one end connected to the high-temperature hot water supply end 5 is disposed on the high-temperature hot water supply pipeline 6, and the other end of the load side secondary water pump 63 is connected to the electric heat storage boiler 4 and/or to the first load side primary water pump 61 and the second load side primary water pump 62, respectively.
Further, the middle-deep closed circulation well 1 is connected in parallel with the low-temperature air source heat pump 3 and the first high-temperature water source heat pump 21, a first valve 64 and a second valve 65 are arranged between the low-temperature air source heat pump 3 and the first high-temperature water source heat pump 21, the middle-deep well circulation water pump 11 is connected between the first valve 64 and the second valve 65 through a third valve 66, the middle-deep well circulation water pump 11 is connected with the second high-temperature water source heat pump 22 through a fourth valve 67, the first load side primary water pump 61 is connected with the high-temperature hot water heat supply pipeline 6 through a fifth valve 68, and the second load side primary water pump 62 is connected with the high-temperature hot water heat supply pipeline 6 through a sixth valve 69.
In the embodiment, in addition to the adoption of the cascade heat pump method of the low-temperature air source heat pump 3 and the high-temperature water source heat pump 2 to reduce the frosting problem, the low-temperature air source heat pump 3 is subjected to hot water defrosting by combining with the intermediate-deep geothermal circulating hot water, that is, the intermediate-deep closed circulating well 1, the low-temperature air source heat pump 3 and the first high-temperature water source heat pump 21 are formed with the intermediate-deep geothermal well composite cascade heat pump defrosting and heating system 7.
Preferably, the composite cascade heat pump defrosting heat supply system 7 for the middle-deep geothermal well comprises a circulating water circulating pump 710 connected with the middle-deep closed circulating well 1 through a circulating water pump 11 of the middle-deep well, an air source heat pump condenser 73 and a water source heat pump evaporator 717 are arranged between the circulating water pump 11 of the middle-deep well and the circulating water circulating pump 710 through a switching valve assembly, the air source heat pump condenser 73 is connected with an air source heat pump evaporator 71 with a fan through an air source heat pump assembly, one end of the water source heat pump evaporator 717 is connected with the water source heat pump condenser 720 through a water source heat pump compressor 718, and the water source heat pump condenser 720 is connected with the other end of the water source heat pump evaporator 717 through a water source heat pump expansion valve 719.
In order to realize the switching of different working conditions, the switching valve assembly comprises a first electric valve 713 connected with the middle-deep well circulating water pump 11, the first electric valve 713 is respectively connected with the air source heat pump condenser 73 through a second electric valve 712 and connected with the water source heat pump compressor 718 through a third electric valve 715, and the circulating water circulating pump 710 is connected with the middle-deep closed circulating well 1 through a fourth electric valve 714.
The air source heat pump assembly comprises a check valve switching pipeline 72 arranged between an air source heat pump condenser 73 and an air source heat pump evaporator 71 with a fan, an air source heat pump expansion valve 74, a filter 75 and a liquid storage device 76 are respectively arranged on the check valve switching pipeline 72 in sequence, a four-way reversing valve 77 is further arranged between the air source heat pump condenser 73 and the air source heat pump evaporator 71 with the fan, and the four-way reversing valve 77 is respectively connected with a gas-liquid separator 78 and an air source heat pump compressor 79.
In this embodiment, the working conditions of the heat storage and supply system of the intermediate-deep geothermal composite air source two-stage heat pump are as follows:
single heat supply working condition:
the single heat supply working condition of the medium-deep geothermal heat pump is as shown in the attached figure 1: starting the middle-deep layer closed circulation well 1, starting the middle-deep layer well circulation water pump 11, starting the first valve 64, the third valve 66, the fourth valve 67, the fifth valve 68 and the sixth valve 69, starting the first high-temperature water source heat pump 21, the second high-temperature water source heat pump 22, the first load side first-stage water pump 61 and the second load side first-stage water pump 62, starting the load side second-stage water pump 63, and supplying heat by using 5-15 ℃ geothermal water and the high-temperature heat pump to prepare high-temperature hot water with the temperature of more than 50 ℃.
The cascade air source heat pump single heat supply working condition is as the attached figure 2: the low-temperature air source heat pump 3 and the first high-temperature water source heat pump 21 are started, the first valve 64, the second valve 65, the fifth valve 68 and the sixth valve 69 are started, the air source heat pump 31 and the first load side first-stage water pump 61 are started, the load side second-stage water pump 63 is started, hot water with the temperature of 20-25 ℃ is prepared through the low-temperature air source heat pump 3, the hot water enters the first high-temperature water source heat pump 21, and high-temperature hot water with the temperature of more than 50 ℃ is further prepared for heat supply.
The single heat supply working condition of the electric heat storage boiler is as follows: the electric heating function or the heat storage and release function of the electric heat storage boiler 4 is started, the load side secondary water pump 63 is started, and high-temperature hot water above 50 ℃ is prepared for heat supply.
Compound heat supply working condition:
as shown in the attached fig. 3 and 4, according to the load change ratio, the middle-deep geothermal heat pump system is preferentially started to serve as a basic heat supply source, the middle-deep geothermal heat pump system is operated under the single heat supply working condition, the middle-deep geothermal heat supply heat load cannot meet the peak load, the air source heat pump system is then started to perform combined heat supply, the middle-deep geothermal heat pump system is operated under the heat supply working condition of the middle-deep geothermal heat pump composite air source heat pump system, the electric heat storage boiler can be started to perform electric heating or heat storage and release for heat supply in extreme cold weather, and the middle-deep geothermal heat pump composite air source heat pump system and the electric heat storage boiler heat supply working condition are operated under the heat supply working condition of the middle-deep geothermal heat pump composite air source heat pump heat supply system and the electric heat storage boiler heat supply. The composite system switches the heat source system according to the optimal heat supply energy efficiency of the system as a control target, so that the energy consumption of the system is reduced, and the stability of the system is improved.
And (3) composite defrosting working condition:
as shown in fig. 5, in a working environment where the outdoor air temperature is lower than zero, a phenomenon of frosting easily occurs on a coil of the air source heat pump unit, so that the energy efficiency of the air source heat pump is reduced, and even the air source heat pump unit cannot normally operate, which is extremely unfavorable for normal heat supply of the whole air source heat pump unit, and thus periodic defrosting is required. In the embodiment, besides the adoption of the overlapping heat pump mode of the low-temperature air source heat pump and the water source heat pump, the frosting problem is reduced, meanwhile, the hot water defrosting is carried out on the air source heat pump by combining the intermediate-deep geothermal circulating hot water, for the intermediate-deep geothermal water of 2 kilometers, the circulation is started, the stable water supply temperature is 15 ℃, at the moment, the intermediate-deep closed circulating well 1, the intermediate-deep well circulating water pump 11, the low-temperature air source heat pump 3, the second valve 65 and the third valve 66 are opened, as shown in the attached drawing 6, the defrosting is realized by switching the internal loops of the air source heat pump, meanwhile, the heat supply is uninterrupted, and the operation energy efficiency and the stability of the air source heat pump are improved by utilizing the terrestrial heat.
The middle-deep geothermal well composite cascade heat pump defrosting and heating system 7 consists of 1-20 components, under the defrosting condition, the middle-deep geothermal well closed circulation well 1, the middle-deep geothermal well circulation water pump 11, the second electric valve 712, the first electric valve 713 and the fourth electric valve 714 are opened, a stable water supply circulation of the middle-deep geothermal water is established, the underground heat is released to the air source heat pump condenser 73, then the refrigerant Carnot circulation is carried out, the circulation of the air source heat pump condenser 73, the check valve switching pipeline 72, the liquid storage device 76, the filter 75, the air source heat pump expansion valve 74, the check valve switching pipeline 72, the air source heat pump evaporator 71 with the fan, the four-way reversing valve 77, the gas-liquid separator 78, the air source heat pump compressor 79, the four-way reversing valve 77 and the air source heat pump 73 is carried out, the heat is released to the air source heat pump evaporator 71 with the fan, thereby eliminating the frost attached to the air source heat pump evaporator 71 with the fan, after the defrosting process is finished, the heating working condition can be started, at this time, the circulating water circulating pump 710, the second electric valve 712 and the third electric valve 715 are started, the middle and deep well circulating water pump 11, the first electric valve 713 and the fourth electric valve 714 are closed, the air source heat pump evaporator 71 with the fan extracts heat in air, the heat is released to the air source heat pump condenser 73 through the circulation of the air source heat pump evaporator 71 with the fan, the check valve switching pipeline 72, the liquid storage device 76, the filter 75, the air source heat pump expansion valve 74, the check valve switching pipeline 72, the air source heat pump condenser 73, the four-way reversing valve 77, the gas-liquid separator 78, the air source heat pump compressor 79, the four-way reversing valve 77 and the air source heat pump evaporator 71 with the fan through the reverse Carnot circulation of the air source heat pump evaporator 71 with the fan, and then passes through the circulating water circulating pump 710, the water source heat pump evaporator 717 and the third electric valve 715, The circulating water of the second electric valve 712 transfers heat to the water source heat pump evaporator 717, and then transfers the heat to the tail end water circulation pipeline through the reverse carnot cycle of the refrigerant in the water source heat pump evaporator 717, the water source heat pump compressor 718, the water source heat pump expansion valve 719 and the water source heat pump condenser 720, and the heat is transmitted to the heat storage boiler or the heat consumption tail end. Therefore, the system can automatically switch the composite defrosting working condition and the composite heating working condition according to the frosting condition, and the overall energy utilization efficiency of the system is greatly improved.
The heat storage working condition is as follows:
during the intermittent heat supply operation, the low-price valley electricity at night can be used for driving the high-energy-efficiency intermediate-deep geothermal heat pump, the intermediate-deep geothermal heat pump 1 is started to store heat for the electric heat storage boiler 4 under the single heat supply working condition, the heat stored can be used as a heat source under the composite working condition in the peak electricity utilization period, and can also be used under the defrosting working condition, so that the overall operation energy consumption is further reduced.
The beneficial effect of this embodiment lies in: the intermediate-deep geothermal energy is fully utilized as a basic heat source, and an auxiliary air source heat pump and an electric energy storage boiler are used as peak regulation measures; meanwhile, energy is stored by using a high-energy-efficiency system by using peak-valley electricity price difference, so that the operation cost is reduced; and the intermediate-deep geothermal water is used for defrosting the cascade air source heat pump, meanwhile, uninterrupted heating is realized, and the heating efficiency and stability of the system are further improved. On the one hand, the stable continuous heat supply of the middle-deep geothermal energy which is not influenced by the climate and the alternation of day and night is particularly suitable for the working condition of extremely cold weather in the northeast, and on the other hand, the heat supply working condition of the heat supply system of the middle-deep geothermal heat pump composite air source heat pump and the electric heat storage boiler is particularly suitable for the operation in low-temperature severe environment, the system is stable in operation, and the energy efficiency is higher. The heating system can efficiently operate in a wider temperature environment interval, can realize conversion of multiple operation modes, namely, composite heating working condition operation is carried out in an ultralow temperature environment below minus 20 ℃, the low temperature environment above minus 20 ℃ is converted into single heat source heating working condition operation, a middle-deep geothermal heat pump single heating working condition is preferentially used, then a cascade type air source heat pump single heating working condition is adopted, an electric heat storage boiler single heating working condition is reused, the energy efficiency is gradually decreased, the stability and the reliability of heating of the whole heat pump system are not influenced when the air source heat pump composite defrosting working condition operates, and the low-temperature adaptability of the air source heat pump can be greatly improved. The overlapping type air source/water source heat pump heating system with the function of defrosting the mid-deep geothermal water can be particularly suitable for running in a low-temperature severe environment in a multi-working-condition mode, the system is stable in running and high in energy efficiency, the low-temperature adaptability of the air source heat pump can be greatly improved, and the efficient running of the whole heating system is also ensured.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the medium-deep closed circulation well 1, the medium-deep well circulation water pump 11, the high-temperature water source heat pump 2, the first high-temperature water source heat pump 21, the second high-temperature water source heat pump 22, the low-temperature air source heat pump 3, the air source heat pump water pump 31, the electric heat storage boiler 4, the high-temperature hot water heating terminal 5, the high-temperature hot water heating pipeline 6, the first load side primary water pump 61, the second load side primary water pump 62, the load side secondary water pump 63, the first valve 64, the second valve 65, the third valve 66, the fourth valve 67, the fifth valve 68, the sixth valve 69, the medium-deep geothermal well composite cascade heat pump defrosting and heating system 7, the air source heat pump evaporator 71 with a fan, the check valve switching pipeline 72, the air source heat pump condenser 73, the air source heat pump expansion valve 74, the filter 75, the liquid reservoir 76, the four-way reversing valve 77, the gas-liquid separator 78, the air source heat pump evaporator 71, the air source heat pump evaporator, the air source heat pump expansion valve 74, the air-liquid separator, and the like are used more The terms air source heat pump compressor 79, circulating water circulating pump 710, second electric valve 712, first electric valve 713, fourth electric valve 714, third electric valve 715, water source heat pump evaporator 717, water source heat pump compressor 718, water source heat pump expansion valve 719, water source heat pump condenser 720, etc., but do not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. The heat storage and supply system of the middle-deep geothermal composite air source double-stage heat pump comprises a middle-deep closed circulation well (1) and is characterized in that the middle-deep closed circulation well (1) is connected with at least two high-temperature water source heat pumps (2) in parallel, at least one high-temperature water source heat pump (2) in each high-temperature water source heat pump (2) is connected with a low-temperature air source heat pump (3), at least one high-temperature water source heat pump (2) in each high-temperature water source heat pump (2) is connected with a high-temperature hot water heat supply end (5) through an electric heat storage boiler (4) and/or at least one high-temperature water source heat pump (2) in each high-temperature water source heat pump (2) is directly connected with the high-temperature hot water heat supply end (5).
2. The heat storage and supply system of the middle-deep geothermal composite air source two-stage heat pump is characterized in that the middle-deep closed circulation well (1) is connected with a first high-temperature water source heat pump (21) and a second high-temperature water source heat pump (22) in parallel through a middle-deep well circulation water pump (11), and the first high-temperature water source heat pump (21) is connected with a low-temperature air source heat pump (3) through an air source heat pump water pump (31).
3. The heat storage and supply system of the intermediate-deep geothermal composite air source two-stage heat pump according to claim 2, wherein the high-temperature hot water supply end (5) is arranged at one end of the high-temperature hot water supply pipeline (6), the first high-temperature water source heat pump (21) is connected to the high-temperature hot water supply pipeline (6) through a first load side one-stage water pump (61), and the second high-temperature water source heat pump (22) is connected to the high-temperature hot water supply pipeline (6) through a second load side one-stage water pump (62).
4. The heat storage and supply system of the middle-deep geothermal composite air source two-stage heat pump is characterized in that the electric heat storage boiler (4) is arranged on a high-temperature hot water supply pipeline (6), a load side two-stage water pump (63) with one end connected with a high-temperature hot water supply end (5) is arranged on the high-temperature hot water supply pipeline (6), and the other end of the load side two-stage water pump (63) is connected with the electric heat storage boiler (4) and/or is respectively connected with a first load side one-stage water pump (61) and a second load side one-stage water pump (62).
5. The heat storage and supply system of the middle-deep geothermal composite air source double-stage heat pump according to claim 2, 3 or 4, wherein the middle-deep closed circulation well (1) is respectively connected with the low-temperature air source heat pump (3) and the first high-temperature water source heat pump (21) in parallel, a first valve (64) and a second valve (65) are respectively arranged between the low-temperature air source heat pump (3) and the first high-temperature water source heat pump (21), the middle-deep well circulation water pump (11) is connected between the first valve (64) and the second valve (65) through a third valve (66), and the middle-deep well circulation water pump (11) is connected with the second high-temperature water source heat pump (22) through a fourth valve (67).
6. The heat storage and supply system of the intermediate-deep geothermal composite air source two-stage heat pump is characterized in that the first load side first-stage water pump (61) is connected with the high-temperature hot water supply pipeline (6) through a fifth valve (68), and the second load side first-stage water pump (62) is connected with the high-temperature hot water supply pipeline (6) through a sixth valve (69).
7. The heat storage and supply system of the middle-deep geothermal composite air source double-stage heat pump according to claim 2, wherein a middle-deep geothermal well composite cascade heat pump defrosting and supply system (7) is formed among the middle-deep closed circulation well (1), the low-temperature air source heat pump (3) and the first high-temperature water source heat pump (21).
8. The heat storage and supply system of the middle-deep geothermal composite air source two-stage heat pump according to claim 7, wherein the middle-deep geothermal well composite cascade heat pump defrosting and supply system (7) comprises a circulating water circulating pump (710) connected with a middle-deep closed circulating well (1) through a middle-deep well circulating water pump (11), an air source heat pump condenser (73) and a water source heat pump evaporator (717) are arranged between the middle-deep well circulating water pump (11) and the circulating water circulating pump (710) through a switching valve assembly, the air source heat pump condenser (73) is connected with an air source heat pump evaporator (71) with a fan through an air source heat pump assembly, one end of the water source heat pump evaporator (717) is connected with the water source heat pump condenser (720) through a water source heat pump compressor (718), and the water source heat pump condenser (720) is connected with the other end of the water source heat pump evaporator (717) through a water source heat pump expansion valve (719) Are connected.
9. The heat storage and supply system of the double-stage heat pump of the intermediate-deep geothermal composite air source according to claim 8, wherein the switching valve assembly comprises a first electric valve (713) connected with the intermediate-deep well circulating water pump (11), the first electric valve (713) is respectively connected with the air source heat pump condenser (73) through a second electric valve (712) and connected with the water source heat pump compressor (718) through a third electric valve (715), and the circulating water circulating pump (710) is connected with the intermediate-deep closed circulating well (1) through a fourth electric valve (714).
10. The heat storage and supply system of the mid-deep geothermal composite air source two-stage heat pump according to claim 8, wherein the air source heat pump assembly comprises a check valve switching pipeline (72) arranged between an air source heat pump condenser (73) and an air source heat pump evaporator (71) with a fan, the check valve switching pipeline (72) is respectively and sequentially provided with an air source heat pump expansion valve (74), a filter (75) and a liquid reservoir (76), a four-way reversing valve (77) is further arranged between the air source heat pump condenser (73) and the air source heat pump evaporator (71) with the fan, and the four-way reversing valve (77) is respectively connected with a gas-liquid separator (78) and an air source heat pump compressor (79).
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4100763A (en) * | 1976-06-21 | 1978-07-18 | International Telephone & Telegraph Corporation | Multi-source heat pump HVAC system |
| CN201265981Y (en) * | 2008-08-06 | 2009-07-01 | 高秀明 | Water heating apparatus of flexible two-stage coupling phase-change energy accumulation defrosting heat pump |
| CN102721234A (en) * | 2012-05-31 | 2012-10-10 | 浙江陆特能源科技有限公司 | Ground-source heat pump system suitable for indoor swimming pool |
| CN103047802A (en) * | 2012-12-26 | 2013-04-17 | 苏州设计研究院股份有限公司 | Air source heat pump defrosting system used in winter |
| CN207849549U (en) * | 2018-02-07 | 2018-09-11 | 沈阳汇智源电力工程技术服务有限公司 | A kind of heat network system for electric heat storage peak regulation |
| CN209084867U (en) * | 2018-11-08 | 2019-07-09 | 陕西省煤田地质集团有限公司 | A kind of mid-deep strata and shallow layer geothermal energy combined heat and shallow layer geothermal energy concurrent heating system |
-
2021
- 2021-11-09 CN CN202111319476.8A patent/CN113883580B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4100763A (en) * | 1976-06-21 | 1978-07-18 | International Telephone & Telegraph Corporation | Multi-source heat pump HVAC system |
| CN201265981Y (en) * | 2008-08-06 | 2009-07-01 | 高秀明 | Water heating apparatus of flexible two-stage coupling phase-change energy accumulation defrosting heat pump |
| CN102721234A (en) * | 2012-05-31 | 2012-10-10 | 浙江陆特能源科技有限公司 | Ground-source heat pump system suitable for indoor swimming pool |
| CN103047802A (en) * | 2012-12-26 | 2013-04-17 | 苏州设计研究院股份有限公司 | Air source heat pump defrosting system used in winter |
| CN207849549U (en) * | 2018-02-07 | 2018-09-11 | 沈阳汇智源电力工程技术服务有限公司 | A kind of heat network system for electric heat storage peak regulation |
| CN209084867U (en) * | 2018-11-08 | 2019-07-09 | 陕西省煤田地质集团有限公司 | A kind of mid-deep strata and shallow layer geothermal energy combined heat and shallow layer geothermal energy concurrent heating system |
Non-Patent Citations (1)
| Title |
|---|
| 丁伟翔，蔡小凤: "空气源水源双级耦合热泵系统全年节能性测算与分析", 《建筑节能》 * |
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