CN220169693U - Heat pump and phase-change energy storage coupled heating system - Google Patents
Heat pump and phase-change energy storage coupled heating system Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 39
- 238000004146 energy storage Methods 0.000 title claims abstract description 14
- 238000005338 heat storage Methods 0.000 claims abstract description 56
- 239000012782 phase change material Substances 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims description 15
- 239000012188 paraffin wax Substances 0.000 claims description 13
- 238000004321 preservation Methods 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 239000011218 binary composite Substances 0.000 claims description 4
- 230000005611 electricity Effects 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 239000010410 layer Substances 0.000 description 12
- 239000012071 phase Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 6
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- 238000005516 engineering process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
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- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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Abstract
The utility model relates to a heat pump and phase-change energy storage coupled heating system, which comprises a solar heat collector, a double-condenser ground source heat pump and a buried double-cavity heat storage tank; the first phase change material is filled in the upper cavity of the buried double-cavity heat storage tank, the second phase change material is filled in the lower cavity, and heat exchange pipelines positioned in the two cavities of the buried double-cavity heat storage tank are connected with the user side; the double-condenser buried heat pump comprises a compressor, a first condenser, a second condenser, a liquid storage tank, an evaporator and a buried pipe; the shell side of the evaporator is connected with the buried pipe, the tube side outlet of the evaporator is connected with the tube side inlet of the first condenser and the tube side outlet of the second condenser through the compressor, the tube side outlet of the first condenser and the tube side outlet of the second condenser are connected with the tube side inlet of the evaporator through the liquid storage tank, the second condenser is positioned in the upper cavity of the buried double-cavity heat storage tank, and the shell side of the first condenser is connected with the user side. The ground source heat pump can operate intermittently without affecting night heating, and the buried heat storage tank can avoid interference between heat storage and heat release of the heat pump heating and the heat storage part.
Description
Technical Field
The utility model belongs to the technical field of energy storage, and particularly relates to a heat pump and phase-change energy storage coupled heating system.
Background
Heat supply is an important link for guaranteeing the life of residents in northern areas of China in winter. The following problems are mainly present in actual heating: firstly, the traditional heat supply mode mainly uses fossil energy combustion, so that a large amount of fossil energy is consumed, and meanwhile, the environment pollution is caused; secondly, although clean energy sources such as solar energy and the like are introduced into a part of areas for heating, the problem of insufficient heat supply in winter can be caused by simply adopting photo-thermal heating due to short sunshine time in winter in the north; thirdly, although high-efficiency heat generating devices such as heat pumps are adopted in partial areas, the power source still takes electric energy as a main source, and the heat pumps are adopted for supplying heat, so that the operation cost in the peak electricity period is high; fourth, the northern areas of China have long sunshine hours in summer and sufficient heat, but the heat cannot be used in winter, so that the time and space of the heat are not matched.
In order to solve the problems, the utility model provides a heat pump and phase-change energy storage coupled heat supply system which can utilize low-price electricity such as valley electricity, wind electricity, photoelectricity and the like and sustainable energy to generate electricity to drive the heat pump to generate heat with high efficiency, on one hand, the heat is directly supplied to a user side, on the other hand, the heat is stored through a phase-change material in an intermittent time period, and the heat is supplied to a room in a peak electricity period by utilizing a phase-change heat storage technology; meanwhile, the buried phase-change heat storage technology is adopted to store heat in a cross-season mode, the problem of heat space-time mismatch in northern areas is solved, and meanwhile, heat stored in a cross-season mode is used for carrying out auxiliary heat supply on a user side, so that efficient, energy-saving and low-cost heat supply is achieved.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a heat pump and phase-change energy storage coupled heating system.
The technical scheme adopted for solving the technical problems is as follows:
a heat pump and phase change energy storage coupled heating system comprises a solar heat collector; the system is characterized by further comprising a double-condenser ground source heat pump and an underground double-cavity heat storage tank; the buried double-cavity heat storage tank is divided into an upper cavity and a lower cavity, wherein the upper cavity is filled with a first phase change material, the lower cavity is filled with a second phase change material, and heat exchange pipelines positioned in the two cavities of the buried double-cavity heat storage tank are connected with a user side; the double-condenser buried heat pump comprises a compressor, a first condenser, a second condenser, a liquid storage tank, an evaporator and a buried pipe; the shell side of the evaporator is connected with the buried pipe, the tube side outlet of the evaporator is divided into a first condenser and a second condenser through a compressor, the tube side outlets of the first condenser and the second condenser are connected with the tube side inlet of the evaporator through a liquid storage tank, the second condenser is positioned in the upper cavity of the buried double-cavity heat storage tank, and the shell side of the first condenser is connected with the user side; the inlet and outlet of the solar heat collector are communicated through a solar heat exchange pipeline, and the solar heat exchange pipeline is coiled in the lower cavity of the buried double-cavity heat storage tank.
Further, thermocouples are respectively arranged in the two cavities of the buried double-cavity heat storage tank.
Further, the tank body outside of the buried double-cavity heat storage tank is coated with a first heat preservation layer, and a second heat preservation layer is arranged between the tank body of the buried double-cavity heat storage tank and the first heat preservation layer.
Further, the height of the upper cavity of the buried double-cavity heat storage tank is not more than 1/4 of the height of the tank, and the height of the lower cavity is not less than 3/4 of the height of the tank.
Further, the first phase change material is a binary composite phase change material consisting of paraffin and expanded graphite, and the second phase change material is paraffin.
Compared with the prior art, the utility model has the beneficial effects that:
(1) The ground source heat pump adopts a double-condenser design, intermittent operation is realized on the premise of not influencing heating at night, heat is stored in the first phase-change material by utilizing a phase-change heat storage technology, normal heat supply is carried out for a user in a power-on period, and the use cost of the heat pump in the power-on period is further reduced.
(2) The utility model adopts the form of the buried heat storage tank to package the phase change material, utilizes the solar heat collector to collect and store the heat in a sunny period in summer, and releases the heat to the user side for auxiliary heat supply in winter. The buried heat storage tank adopts a double-cavity design form, so that the heat storage and heat release processes of the heat pump heating part and the cross-season heat storage part are not interfered with each other, and meanwhile, the heat pump heating part and the cross-season heat storage part take heat conducting materials as separating layers, so that the phase change materials in the upper cavity and the lower cavity are connected to a certain extent.
(3) According to the utility model, the temperature in the indoor and the heat storage tank is monitored in a manner of arranging the thermocouples, so that the valves at all positions are controlled to be opened and closed, intelligent switching among all modes is realized, and the heat supply requirement of a user side is better met. The low-price electricity or clean energy such as valley electricity, wind power generation and solar power generation is used as the power source of the system, so that the consumption of fossil energy is reduced, and the double-carbon policy is responded better.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic structural view of the buried dual-cavity heat storage tank of the present utility model;
FIG. 3 is a workflow diagram of the present utility model;
in the figure, 1-power source; 2-a solar collector; 3-a first water pump; 4-a solar heat exchange pipeline; 5-compressor; 6-a three-way valve; 7-a first condenser; 8-a second condenser; 9-a liquid storage tank; 10-an expansion valve; 11-an evaporator; 12-a second water pump; 13-burying a pipe; 14-an underground double-cavity heat storage tank; 15-a first heat-insulating layer; 16-a second heat preservation layer; 17-a first phase change material; 18-a first heat exchange pipeline; 19-a first thermocouple; 20-a second thermocouple; 21-a metal barrier layer; 22-a second phase change material; 23-a second heat exchange pipeline; 24-four-way valve; 25-a third water pump; 26. a first valve; 27. a second valve; 28. a third valve; 29-fourth water pump; 30-third thermocouple.
Detailed Description
The following specific embodiments are given by way of further details of the technical scheme of the present utility model and are not limiting the scope of the present utility model.
The utility model relates to a heat pump and phase-change energy storage coupled heating system (a system for short, see fig. 1-3), which comprises a solar heat collector 2, a double-condenser ground source heat pump and a buried double-cavity heat storage tank 14; the double-condenser buried heat pump comprises a compressor 5, a first condenser 7, a second condenser 8, a liquid storage tank 9, an evaporator 11 and a buried pipe 13;
the upper part of the buried double-cavity heat storage tank 14 is provided with a metal interlayer 21, the inner cavity of the double-cavity buried heat storage tank 14 is divided into an upper cavity and a lower cavity, the upper cavity is filled with a first phase change material 17, the second condenser 8 is embedded in the first phase change material 17, and the first heat exchange pipeline 18 is coiled in the first phase change material 17 and is connected with an indoor heat supply pipeline; the upper cavity is also internally provided with a first thermocouple 19 for measuring the temperature of the upper cavity; the lower cavity is filled with a second phase change material 22, a second heat exchange pipeline 23 and a solar heat exchange pipeline 4 are coiled in the second phase change material 22, the second heat exchange pipeline 23 is connected with an indoor heat supply pipeline, a fourth water pump 29 is arranged on a connecting main pipe of the first heat exchange pipeline 18 and the second heat exchange pipeline 23, a third valve 28 is arranged at a position, adjacent to the connecting main pipe, of the first heat exchange pipeline 18, and a second valve 27 is arranged at a position, adjacent to the connecting main pipe, of the second heat exchange pipeline 23; a second thermocouple 20 is also arranged in the lower cavity and is used for measuring the temperature of the lower cavity; the two ends of the solar heat exchange pipeline 4 extend out of the buried double-cavity heat storage tank 14 and are connected with the inlet and the outlet of the solar heat collector 2, and a first water pump 3 is arranged at the position, adjacent to the inlet of the solar heat collector 2, of the solar heat exchange pipeline 4; under the action of the first water pump 3, working medium in the solar heat exchange pipeline 4 enters the solar heat collector 2, flows out after heat exchange in the solar heat collector 2, exchanges heat with the second phase change material 22 when passing through the buried double-cavity heat storage tank 14, stores heat in the working medium in the second phase change material 22, and the heat exchanged working medium enters the solar heat collector 2 again for heating, and the heat acquired by the working medium in the solar heat collector 2 mainly heats the second phase change material 22.
The shell side of the evaporator 11 is connected with a buried pipe 13, a second water pump 12 is arranged on the buried pipe 13, a tube side outlet of the evaporator 11 is connected with an inlet of the compressor 5, an outlet of the compressor 5 is respectively connected with tube side inlets of the first condenser 7 and the second condenser 8 through a three-way valve 6, tube side outlets of the first condenser 7 and the second condenser 8 are both connected with a liquid storage tank 9, the liquid storage tank 9 is simultaneously connected with the tube side inlet of the evaporator 11, an expansion valve 10 is arranged on a pipeline connecting the evaporator 11 and the liquid storage tank 9, and the liquid storage tank 9 plays a role of supplementing working media; the shell side of the first condenser 7 is connected with an indoor heat supply pipeline, and a third water pump 25 and a first valve 26 are arranged on a pipeline between the shell side outlet of the first condenser 7 and the inlet of the indoor heat supply pipeline; the outlet of the indoor heat supply pipeline is respectively connected with the shell side of the first condenser 7, the first heat exchange pipeline 18 and the second heat exchange pipeline 23 through a four-way valve 24;
the working medium in the buried pipe 13 exchanges heat with the soil and then enters the shell side of the evaporator 11 to exchange heat with the working medium in the tube side of the evaporator 11, and the working medium in the shell side of the evaporator 11 exchanges heat and then flows back into the buried pipe 13 to exchange heat with the soil continuously; the working medium subjected to heat exchange in the tube pass of the evaporator 11 is pressurized by the compressor 5, enters the tube passes of the first condenser 7 and the second condenser 8 respectively, exchanges heat with the working medium in the shell passes of the first condenser 7 and the second condenser 8, and enters the tube pass of the evaporator 11 again for heat exchange after the working medium in the tube passes of the first condenser 7 and the second condenser 8 exchanges heat, and the working medium subjected to heat exchange in the shell passes of the first condenser 7 enters an indoor heat supply pipeline to supply indoor heat; the working medium in the shell pass of the second condenser 8 exchanges heat with the first phase change material 17, and heat in the working medium is stored in the first phase change material 17.
The burial depth of the buried double-cavity heat storage tank 14 is not more than 0.1m, the volume of the buried double-cavity heat storage tank 14 is designed according to specific requirements, the height of an upper cavity is not more than 1/4 of the height of the tank, and the height of a lower cavity is not less than 3/4 of the height of the tank; the tank body of the buried double-cavity heat storage tank 14 is formed by welding steel plates, and the thickness of the metal interlayer 21 between the upper cavity and the lower cavity is not more than 20mm. The tank body of the buried double-cavity heat storage tank 14 is coated with a first heat preservation layer 15, and a second heat preservation layer 16 is arranged between the tank body of the buried double-cavity heat storage tank 14 and the first heat preservation layer 15; the first heat-insulating layer 15 is made of polymer solid-solid phase change material, and the heat conductivity is not higher than 0.2 W.m -1 ·K -1 The phase transition temperature is less than or equal to 60 ℃; the thermal conductivity of the insulating material of the second insulating layer 16 is not higher than 0.04 W.m -1 ·K -1 。
The first phase-change material 17 is a binary composite phase-change material of paraffin and expanded graphite, and the thermal conductivity is not less than 1 W.m -1 ·K -1 The phase transition temperature is more than or equal to 60 ℃ and less than 70 ℃. The second phase change material is paraffin wax with phase change temperature not lower than 70deg.C and phase change latent heat not lower than 200kJ.kg -1 。
The power source 1 of the whole system is from low-cost electricity or clean energy sources such as valley electricity or wind power generation, solar power generation and the like. All water pumps adopt Menlun Aite 1WZB-15Z type water pumps. The solar heat collector 2 is a plate type heat collector and is installed in a zone with sufficient sunlight on the ground.
The working principle and the working flow of the utility model are as follows:
the system can realize cross-season heating and heating by using valley electricity; in the daytime of summer or in the period of sufficient sunlight in winter, the solar heat collector 2 and the first water pump 3 are started, working medium in the solar heat exchange pipeline 4 enters the solar heat collector 2 under the action of the first water pump 3, the solar heat collector 3 absorbs heat of the sun to heat the working medium, the working medium flows out after heat exchange in the solar heat collector 2, and enters the lower cavity of the buried double-cavity heat storage tank 4 through transportation of the solar heat exchange pipeline 4 to heat the second phase change material 22, heat in the working medium is stored in the second phase change material 22, and when the temperature of the lower cavity measured by the second thermocouple 20 exceeds the phase change temperature of the second phase change material 22, heat storage of the second phase change material 22 is completed, and the solar heat collector 2 and the first water pump 3 stop running.
In the night valley period in winter, the double-condenser ground source heat pump starts to operate, and working medium in the ground buried pipe 13 exchanges heat with soil and then enters the shell side of the evaporator 11 to exchange heat with working medium in the tube side of the evaporator 11, and the working medium in the shell side of the evaporator 11 returns to the ground buried pipe 13 to exchange heat with soil continuously; the working medium subjected to heat exchange in the tube pass of the evaporator 11 is pressurized by the compressor 5, enters the tube pass of the first condenser 7 and exchanges heat with the working medium in the shell pass of the first condenser 7 to directly supply heat for the room, and in the process, the valve of the three-way valve 6 communicated with the second condenser 8 is in a closed state; the working medium subjected to heat exchange in the tube pass of the first condenser 7 passes through the liquid storage tank 9 and then enters the evaporator 11 again; meanwhile, the room temperature is monitored by the third thermocouple 30, when the room temperature is greater than or equal to the set temperature (for example, 25 ℃), after the indoor heating requirement is met, the valve of the three-way valve 6 communicated with the first condenser 7 is closed, the valve of the three-way valve 6 communicated with the second condenser 8 is opened, the working medium pressurized by the compressor 5 enters into the tube pass of the second condenser 8 and exchanges heat with the working medium in the shell pass of the second condenser 8, and the working medium in the shell pass of the second condenser 8 exchanges heat with the first phase change material 17 in the upper cavity of the buried double-cavity heat storage tank 14, so that the heat is stored in the first phase change material 17; the working medium subjected to heat exchange in the tube pass of the second condenser 8 passes through the liquid storage tank 9 and then enters the evaporator 11 again; when the indoor temperature is reduced and is lower than the set temperature (for example, 15 ℃), the valve of the three-way valve 6 is switched again, namely, the valve communicated with the second condenser is closed, the valve communicated with the first condenser 7 is opened, heat is supplied to the indoor space, and the cycle is performed until the first thermocouple 19 detects that the upper cavity temperature exceeds the phase change temperature of the first phase change material 17, and then the heat storage of the first phase change material 17 is completed.
In the daytime peak electricity period in winter, the double-condenser ground source heat pump stops running, the fourth water pump 29 is started, and the working medium in the first heat exchange pipeline 18 exchanges heat with the first phase change material 17 in the upper cavity of the buried double-cavity heat storage tank 14 to supply heat for the indoor space; at this time, the first thermocouple 19 monitors the temperature of the first phase change material 17 in the upper cavity, the third thermocouple 30 monitors the indoor temperature, when the fluctuation of the room temperature is large or the indoor temperature is lower than the set temperature (for example, 15 ℃) or the temperature of the first phase change material 17 in the upper cavity is lower than the phase change temperature, the power of the fourth water pump 29 is increased, the second valve 27 on the second heat exchange pipeline 23 is opened, the working medium in the second heat exchange pipeline 23 exchanges heat with the second phase change material 22 in the lower cavity, the indoor heat is supplemented, when the indoor temperature is higher than the set temperature (for example, 25 ℃), the second valve 27 is closed to stop the indoor heat supplementing, and the intermittent heat supplementing is carried out on the indoor by recycling the heat stored by the second phase change material 22 in the lower cavity.
Example 1
The design process for the buried double-cavity heat storage tank is as follows:
taking Tianjin area as a standard, taking 1 user supplied by the system as a calculation standard, estimating the heat load of the user side by adopting a volumetric heat index method, wherein the calculation formula is as follows:
Q n ＝q v V w (t n -t w )×10 -3
wherein Q is n Designing a heat load for heating of a building, kW; v (V) w For the peripheral volume of the building, m 3 ；t n Calculating the temperature in a heating room, wherein the temperature is lower than the temperature;t w calculating the temperature, DEG C, for the heating outdoor; q v W/(m) is the heat index of heating volume of building 3 ·℃)；
Assuming that the number of days of heating in Tianjin city is 120 days, the temperature t is calculated in heating room n The temperature of the heating outdoor is 18 ℃ and is minus 7 ℃, and the heating volume heat index q of the building is selected by consulting the data v Is 0.5W/(m) 3 User residence preliminary estimated floor space is 100m 2 The height is 2.8m; calculated Q n ＝3.22kW。
The first phase change material filled in the upper cavity of the buried double-cavity heat storage tank is a binary composite phase change material of paraffin and expanded graphite (mainly storing heat through the phase change material, and the heat stored by the second condenser is used for heating in daytime), and the first phase change material supplies heat in the peak electricity period, so that the heating time is selected to be 12 hours, the ratio of the first phase change material to the second phase change material is initially selected to be 19:1, and the phase change latent heat is measured to be 184.2 kJ.kg -1 Because the density of the phase change material changes when the solid-liquid phase change occurs, the smaller value of the density values of the solid phase and the liquid phase is 770 kg.m -3 The density of the expanded graphite is selected to be 1200 kg.m -3 The method comprises the steps of carrying out a first treatment on the surface of the The mass of paraffin wax and expanded graphite were calculated separately according to the following formulas:
wherein m is 1 The mass of the filler is kg of the upper cavity; n is n 1 Heating time length h for the upper cavity; r is (r) 1 Is the latent heat of phase change of the first phase change material, kJ/kg; m is m a 、m b The mass of the paraffin wax and the mass of the expanded graphite are kg respectively;
calculated paraffin waxThe mass of the expanded graphite was 718.2kg and the mass of the expanded graphite was 37.8kg, and the volume required for both was 0.96m 3 。
The second phase change material filled in the lower cavity of the buried double-cavity heat storage tank is paraffin, the second phase change material is subjected to intermittent heat supply, the time of daily heat supply is about 1-3h, the heat supply time is 90-120 days, and the phase change latent heat is 220 kJ.kg -1 Density of 770 kg.m -3 The method comprises the steps of carrying out a first treatment on the surface of the The mass of paraffin was calculated according to the following formula:
wherein m is 2 The mass of the filler is kg of the lower cavity; n is n 2 Heating time length h for the lower cavity; r is (r) 2 kJ/kg, which is the latent heat of phase change of the second phase change material; n is the number of days of heating;
the mass of the paraffin wax required by calculation is 4871.5kg-18968.7kg, and the volume is further calculated to be 6.5m 3 -24.6m 3 ；
Comprehensively considering the heat loss in the heat transfer process, the condition that the heat of the upper cavity is transferred to the lower cavity and the condition that the heat exchange pipeline is arranged inside the heat storage tank, the volume of the buried double-cavity heat storage tank can be selected to be 15m 3 -36 m 3 Wherein the upper cavity height ratio is not more than 1/4 of the tank height, and the lower cavity height is not less than 3/4 of the tank height.
Example 2
Compared with a single heat pump system, the heat supply system provided by the utility model has the advantages that the energy consumption is minimum under the same heat output condition, the energy saving effect is obvious, and the power consumption cost is reduced.
According to the data in the embodiment 1, taking the system to supply 1 user as a calculation standard, wherein the total heat load is 3.22kW, and the power of a single ground source heat pump is 1.2kW; according to the heating standard of Tianjin area, the heat pump system runs continuously, the heating time is 120 days (120×24=2880 h), and the electricity consumption of the common heat pump is 3456 kw.h; according to the peak-valley electricity price standard in Tianjin area, the peak time period is 6:00 to 21:00 per day, and the electricity price standard is 0.49 yuan per kilowatt-hour; the valley period is 21:00 a day to 6:00 a day, and the electricity price standard is 0.30 yuan per kilowatt-hour; because the utility model only drives the heat pump to work in the valley period, the electric charge of the peak period of the heat pump in the daytime is saved, and compared with a system in which a single heat pump works, the electric charge can be saved by 1058.4 yuan a year.
Table 1 parameters of two systems
The utility model is applicable to the prior art where it is not described.
Claims (5)
1. A heat pump and phase change energy storage coupled heating system comprises a solar heat collector; the system is characterized by further comprising a double-condenser ground source heat pump and an underground double-cavity heat storage tank; the buried double-cavity heat storage tank is divided into an upper cavity and a lower cavity, wherein the upper cavity is filled with a first phase change material, the lower cavity is filled with a second phase change material, and heat exchange pipelines positioned in the two cavities of the buried double-cavity heat storage tank are connected with a user side; the double-condenser buried heat pump comprises a compressor, a first condenser, a second condenser, a liquid storage tank, an evaporator and a buried pipe; the shell side of the evaporator is connected with the buried pipe, the tube side outlet of the evaporator is divided into a first condenser and a second condenser through a compressor, the tube side outlets of the first condenser and the second condenser are connected with the tube side inlet of the evaporator through a liquid storage tank, the second condenser is positioned in the upper cavity of the buried double-cavity heat storage tank, and the shell side of the first condenser is connected with the user side; the inlet and outlet of the solar heat collector are communicated through a solar heat exchange pipeline, and the solar heat exchange pipeline is coiled in the lower cavity of the buried double-cavity heat storage tank.
2. The heat pump and phase-change energy storage coupled heating system of claim 1, wherein thermocouples are respectively disposed in two cavities of the buried dual-cavity heat storage tank.
3. The heat pump and phase-change energy storage coupled heating system according to claim 1 or 2, wherein a first heat preservation layer is coated on the outer side of the tank body of the buried double-cavity heat storage tank, and a second heat preservation layer is arranged between the tank body of the buried double-cavity heat storage tank and the first heat preservation layer.
4. The heat pump and phase change energy storage coupled heating system of claim 1, wherein the upper cavity height of the buried dual-cavity heat storage tank is no more than 1/4 of the tank height and the lower cavity height is no less than 3/4 of the tank height.
5. The heat pump and phase change energy storage coupled heating system of claim 1, wherein the first phase change material is a binary composite phase change material comprising paraffin and expanded graphite, and the second phase change material is paraffin.
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