Cross-season composite ground source heat pump energy storage device

Abstract

The utility model relates to a cross-season composite ground source heat pump energy storage device. Comprising a ground source heat storage buried pipe system, a heat storage buffer tank, a heating unit, an air cooler, a compressor, a carbon dioxide storage tank, an evaporator, an expansion throttling device, a refrigeration unit, a ground source cold storage buried pipe system, a cold storage buffer tank, a cold storage medium storage tank, a heat storage medium storage tank, a waste heat boiler, a heat exchanger and a heat storage medium boiler. The output end of the ground source heat storage buried pipe system is connected with an inlet of the heat storage buffer tank, an outlet of the heat storage buffer tank is divided into two paths, one path is connected with an inlet of the heat storage medium storage tank, and the other path is connected with the heating unit through a third valve and a fourth valve which are connected in parallel; and the output end of the ground source cold storage buried pipe system is connected with the inlet of the cold storage buffer tank. According to the utility model, the CO2 cold and heat integrated system and the ground source pump system are combined, so that the pressure in the peak period of power utilization and grid connection can be effectively relieved, and the cold and heat energy distribution of the traditional ground source pump can be balanced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, and in particular to a cross-seasonal composite ground source heat pump energy storage device. Background Art

[0002] A geothermal heat pump is a system that uses heat energy from the soil or groundwater for heating and cooling. It utilizes the constant underground temperature for heat exchange, achieving efficient energy utilization. A geothermal heat pump system consists of a geothermal heat exchanger, a heat pump unit, heating equipment, and a control system. It transfers heat between the ground and the building through a circulating working fluid.

[0003] Transcritical CO2 integrated cooling and heating technology is an advanced technology that uses carbon dioxide (CO2) as a working fluid for both cooling and heating. Refrigeration systems using CO2 as a working fluid offer advantages such as environmental friendliness, high efficiency, and a wide temperature control range. Currently, transcritical CO2 integrated cooling and heating technology has been applied in commercial buildings, office buildings, and residential areas, and is gradually maturing.

[0004] Traditional ground-source heat pump systems have some problems in actual operation, such as inconvenient power adjustment, uneven energy distribution, excessive underground heat exploitation, unstable energy supply, etc. Especially during peak demand periods, the system may not be able to meet demand.

[0005] Traditional household air conditioning systems and HVAC systems mostly use fluorocarbons such as Freon as refrigerant compounds, which may damage the ozone layer and have a high global warming potential.

[0006] CO2 integrated cooling and heating system: In summer, due to the high outside temperature, the required cooling temperature of the CO2 refrigeration system is also high, and the refrigeration efficiency is low. In addition, the peak period of air conditioning load in summer is also the peak period of electricity consumption, the electricity price is more expensive, and the operating costs are higher.

[0007] Ground-source pump systems are energy-efficient products, but due to regional differences, the requirements for ground-source pumps vary. In some northern regions, heat demand far outweighs cooling demand, while in some southern regions, cooling demand far outweighs heat demand. Consequently, there can be an imbalance in the heat storage and extraction of ground-source pumps, leading to uneven energy distribution and a deterioration of the ground-source temperature environment. Utility Model Content

[0008] The purpose of this utility model is to provide a cross-seasonal composite ground source heat pump energy storage device, which combines the CO2 cooling and heating integrated system and the ground source pump system, which can not only effectively alleviate the pressure of peak electricity consumption on the grid, but also balance the cooling and heating energy distribution of traditional ground source pumps.

[0009] The utility model provides a cross-seasonal composite ground source heat pump energy storage device, including a ground source heat storage buried pipe system, a heat storage buffer tank, a heating unit, an air cooler, a compressor, a carbon dioxide storage tank, an evaporator, an expansion throttling device, a refrigeration unit, a ground source cold storage buried pipe system, a cold storage buffer tank, a cold storage medium storage tank, a heat storage medium storage tank, a waste heat furnace, a heat exchanger, and a heat storage medium boiler;

[0010] The output end of the ground source heat storage buried pipe system is connected to the inlet of the heat storage buffer tank, and the outlet of the heat storage buffer tank is divided into two paths, one of which is connected to the inlet of the heat storage medium storage tank, and the other is connected to the heating unit through the third valve and the fourth valve connected in parallel; the outlet of the heat storage medium storage tank is connected to the inlet of the waste heat furnace through the heat exchanger; the outlet of the waste heat furnace is connected to the input end of the ground source heat storage buried pipe system through the heat exchanger, the second valve, and the first valve in sequence; the outlet of the heat storage medium boiler is divided into two paths, one of which is connected to the waste heat furnace and the heat exchanger through the ninth valve, and the other is connected to the second valve through the tenth valve;

[0011] The output end of the ground-source cold storage buried pipe system is connected to the inlet of the cold storage buffer tank, and the outlet of the cold storage buffer tank is divided into two paths, one of which is connected to the inlet of the cold storage medium tank, and the other is connected to the refrigeration unit through the twelfth valve and the thirteenth valve connected in parallel; the outlet of the cold storage medium tank is connected to the input end of the ground-source cold storage buried pipe system through the fifth valve and the sixth valve in sequence; the refrigeration unit is connected to the input end of the ground-source cold storage buried pipe system through the eleventh valve;

[0012] The evaporator is connected to the refrigeration unit, and the air cooler is connected to the heating unit; the output end of the evaporator is connected to the input end of the ground source heat storage buried pipe system through the carbon dioxide storage tank, the compressor, the air cooler, and the eighth valve in sequence; the output end of the air cooler is connected to the refrigeration unit through the expansion throttling device, the evaporator, and the fourteenth valve.

[0013] Furthermore, a first circulation pump is provided between the second valve and the first valve.

[0014] Furthermore, a second circulation pump is provided between the sixth valve and the fifth valve.

[0015] Furthermore, the waste heat furnace is a waste heat furnace in coal chemical industry, landfill and power plant.

[0016] This solution, through a cross-seasonal composite ground-source heat pump energy storage device, combines the CO2 cooling and heating integrated system with the ground-source pump system. This effectively alleviates the pressure of peak grid electricity demand while balancing the cooling and heating energy distribution of traditional ground-source pumps. This composite system can further improve the energy efficiency of the ground-source heat pump system, reduce operating costs, and reduce dependence on traditional energy sources. This makes the ground-source heat pump system more flexible and stable, adapting to the changing energy demands of different seasons and climate conditions.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model's cross-seasonal composite ground source heat pump energy storage device.

[0019] Numbers in the figure:

[0020] 1-First valve; 2-Second valve; 3-Third valve; 4-Fourth valve; 5-Fifth valve; 6-Sixth valve; 7-Seventh valve; 8-Eighth valve; 9-Ninth valve; 10-Tenth valve; 11-Eleventh valve; 12-Twelfth valve; 13-Thirteenth valve; 14-Fourteenth valve; 15-Ground source heat storage buried pipe system; 16-Heat storage buffer tank; 17-First circulation pump; 18-Heating unit; 19-Air cooler; 20-Compressor; 21-Carbon dioxide storage tank; 22-Evaporator; 23-Expansion throttling device; 24-Refrigeration unit; 25-Ground source cold storage buried pipe system; 26-Cold storage buffer tank; 27-Second circulation pump; 28-Cold storage medium storage tank; 29-Heat storage medium storage tank; 30-(Coal chemical, landfill, power plant) waste heat furnace; 31-Heat exchanger; 32-(Green electricity water / ) heat storage medium boiler. DETAILED DESCRIPTION

[0021] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] Ginseng Figure 1As shown, this embodiment provides a cross-seasonal composite ground source heat pump energy storage device, including a ground source heat storage buried pipe system 15, a heat storage buffer tank 16, a heating unit 18, an air cooler 19, a compressor 20, a carbon dioxide storage tank 21, an evaporator 22, an expansion throttling device 23, a refrigeration unit 24, a ground source cold storage buried pipe system 25, a cold storage buffer tank 26, a cold storage medium storage tank 28, a heat storage medium storage tank 29, a waste heat furnace 30, a heat exchanger 31, and a heat storage medium boiler 32; the output end of the ground source heat storage buried pipe system 15 is connected to the inlet of the heat storage buffer tank 16, and the outlet of the heat storage buffer tank 16 is connected to the outlet of the heat storage buffer tank 16. It is divided into two routes, one of which is connected to the inlet of the heat storage medium tank 29, and the other is connected to the heating unit 18 through the third valve 3 and the fourth valve 4 in parallel; the outlet of the heat storage medium tank 29 is connected to the inlet of the waste heat furnace 30 through the heat exchanger 3); the outlet of the waste heat furnace 30 is connected to the input end of the ground source heat storage buried pipe system 15 through the heat exchanger 31, the second valve 2, and the first valve 1 in sequence; the outlet of the heat storage medium boiler 32 is divided into two routes, one of which is connected to the waste heat furnace 30 and the heat exchanger 31 through the ninth valve 9, and the other is connected to the second valve 2 through the tenth valve 10.

[0023] The output of the ground-source cold storage buried pipe system 25 is connected to the inlet of the cold storage buffer tank 26. The outlet of the cold storage buffer tank 26 is divided into two routes: one route is connected to the inlet of the cold storage medium tank 28, and the other route is connected to the refrigeration unit 24 via the parallel twelfth valve 12 and thirteenth valve 13. The outlet of the cold storage medium tank 28 is connected to the input of the ground-source cold storage buried pipe system 25 via the fifth valve 5 and the sixth valve 6, respectively. The refrigeration unit 24 is connected to the input of the ground-source cold storage buried pipe system 25 via the eleventh valve 11. The evaporator 22 is connected to the refrigeration unit 24, and the air cooler 19 is connected to the heating unit 18. The output of the evaporator 22 is connected to the input of the ground-source heat storage buried pipe system 15 via the carbon dioxide storage tank 21, the compressor 20, the air cooler 19, and the eighth valve 8. The output of the air cooler 19 is connected to the refrigeration unit 24 via the expansion throttling device 23, the evaporator 22, and the fourteenth valve 14. A first circulating pump 17 is provided between the second valve 2 and the first valve 1. A second circulation pump 27 is provided between the sixth valve 6 and the fifth valve 5 .

[0024] This inter-seasonal composite ground-source heat pump energy storage device can utilize low-temperature waste heat, waste heat, and abandoned wind and solar power generation resources during seasons with relatively low heat demand, converting them into thermal energy and storing the heat underground through ground-source buried pipes. The specific working principle is as follows:

[0025] A large amount of low-grade waste heat such as blast furnace top gas and coke oven gas waste heat is comprehensively utilized, and heat is exchanged with the heat storage medium through a heat exchanger. The first valve 1 and the second valve 2 are opened, and the heat storage medium stores the heat in the ground source heat storage buried pipe system 15 through a circulation pump.

[0026] To fully utilize green electricity from wind and solar power during off-peak hours, close valve 10 and open valve 9. Heat is exchanged between the heat exchanger and the heat storage medium, which then flows through a circulation pump and stores the heat in the ground-source heat pipe system. When green electricity is sufficient, valve 10 is also opened to directly heat the heat storage medium, which then flows through the pipeline and the circulation pump, storing the heat in the ground-source heat storage pipe system 15.

[0027] When the heat demand is low, the third valve 3, the fourth valve 4, and the eighth valve 8 are closed, and the seventh valve 7 is opened. The load of the carbon dioxide cooling and heating integrated system is low, and the heat storage medium can be directly passed to the heating unit 18 for use after heat exchange in the air cooler. When midsummer comes and the temperature rises further, the eighth valve 8 is opened synchronously, and the excess heat is stored in the ground source heat storage buried pipe system 15 through the pipeline.

[0028] When the demand for heat is high in winter, the load of the carbon dioxide integrated heating and cooling system is high. At this time, the heat stored in the ground source buried pipe is used, the fourth valve 4 and the eighth valve 8 are closed, and the third valve 3 and the seventh valve 7 are opened. The heat of the heat storage medium flows directly to the heating unit 18 through the third valve 3, thereby helping to improve the heating efficiency of the carbon dioxide integrated heating and cooling system. In some northern regions, when entering deep winter, the temperature drops significantly and the demand for heat further increases. The third valve 3, the seventh valve 7, and the eighth valve 8 are closed, and the fourth valve 4 is opened. The heat storage medium in the ground source buried pipe exchanges heat with the air cooler of the carbon dioxide integrated heating and cooling circulation system before flowing to the heating unit 18, thereby further improving the efficiency of the carbon dioxide integrated heating and cooling system and reducing energy consumption.

[0029] On the other hand, the cold energy in the air can be utilized in seasons with relatively low demand for cooling, and stored underground through ground source buried pipes. The specific working principle is as follows:

[0030] Open the fifth valve 5 and the sixth valve 6, and the cold in the air flows through the cold storage medium through the circulation pump and is stored in the ground source cold storage buried pipe system 25.

[0031] When the demand for cooling is low, the eleventh valve 11, the twelfth valve 12, and the thirteenth valve 13 are closed, and the fourteenth valve 14 is opened. The load of the carbon dioxide cooling and heating integrated system is low, and the cold storage medium can be directly passed to the refrigeration unit 24 for use after the cold exchange through the evaporator 22; in the cold winter, the temperature drops further and the demand for cooling decreases. At this time, the eleventh valve 11 is opened, and the excess cooling energy is stored in the ground source cooling buried pipe system 25 through the pipeline.

[0032] When the demand for cooling is high, the cooling capacity stored in the ground source buried pipe is taken out, the thirteenth valve 13 and the eleventh valve 11 are closed, and the twelfth valve 12 and the fourteenth valve 14 are opened. The heat of the cooling medium flows directly to the refrigeration unit 24 through the twelfth valve 12, thereby helping to improve the cooling efficiency of the carbon dioxide cooling and heating integrated system. When entering midsummer, the cooling demand further increases, the twelfth valve 12, the eleventh valve 11, and the fourteenth valve 14 are closed, and the thirteenth valve 13 is opened. The cooling medium exchanges cooling capacity with the evaporator of the carbon dioxide cooling and heating integrated circulation system and then flows to the refrigeration unit 24, thereby further improving the efficiency of the carbon dioxide cooling and heating integrated system and reducing energy consumption.

[0033] Through this cross-seasonal composite ground-source heat pump energy storage device, during the non-heating season, the system will prioritize the storage of waste heat resources. After the waste heat passes through the heat exchanger and the heat storage medium, the first valve 1 is opened to enter the heat storage tank for heat storage. At the same time, the heat storage medium passes through the circulation pump to enter the ground-source heat storage buried pipe system for heat storage. After heat exchange with the stratum, the cold medium will enter the cold storage tank through the circulation pump. The cold storage tank is connected to the water inlet side of the carbon dioxide hot and cold integrated evaporator through the ninth valve 9. If the temperature is low enough, there is no need to start the carbon dioxide unit to directly supply cooling to the user. If the temperature is not low enough, the unit is turned on at low power to meet the user's cooling needs.

[0034] During the heating period, if there is surplus heat, it is used first to meet the heating needs of users. If the surplus heat is insufficient, the heat storage tank is activated, the second valve 2 is opened to enter the CO2 unit air cooler, and the unit is turned on to provide heating for users, maximizing the use of surplus heat and cross-seasonal heat storage resources, and correspondingly reducing the unit operating power, saving energy and reducing consumption.

[0035] This inter-seasonal composite ground-source heat pump energy storage device combines a ground-source heat pump system with a transcritical carbon dioxide integrated cooling and heating system. It fully utilizes green electricity from wind power, photovoltaics, and other sources of waste heat to provide power for the system. It also uses this technology to balance heat and cooling across seasons with large temperature differences, effectively alleviating the pressure of peak grid demand while balancing the cooling and heating energy distribution of traditional ground-source pumps. This composite system can further improve the energy efficiency of the ground-source heat pump system, reduce operating costs, and reduce dependence on traditional energy sources. This makes the ground-source heat pump system more flexible and stable, adapting to changing energy demands across different seasons and climate conditions.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A cross-seasonal composite ground source heat pump energy storage device, characterized in that: The invention comprises a ground source heat storage buried pipe system (15), a heat storage buffer tank (16), a heating unit (18), an air cooler (19), a compressor (20), a carbon dioxide storage tank (21), an evaporator (22), an expansion throttling device (23), a refrigeration unit (24), a ground source cold storage buried pipe system (25), a cold storage buffer tank (26), a cold storage medium storage tank (28), a heat storage medium storage tank (29), a waste heat furnace (30), a heat exchanger (31), and a heat storage medium boiler (32); The output end of the ground source heat storage buried pipe system (15) is connected to the inlet of the heat storage buffer tank (16), and the outlet of the heat storage buffer tank (16) is divided into two paths, one of which is connected to the inlet of the heat storage medium storage tank (29), and the other is connected to the heating unit (18) through the third valve (3) and the fourth valve (4) connected in parallel; the outlet of the heat storage medium storage tank (29) is connected to the inlet of the waste heat furnace (30) through the heat exchanger (31); the outlet of the waste heat furnace (30) is connected to the input end of the ground source heat storage buried pipe system (15) through the heat exchanger (31), the second valve (2), and the first valve (1) in sequence; the outlet of the heat storage medium boiler (32) is divided into two paths, one of which is connected to the waste heat furnace (30) and the heat exchanger (31) through the ninth valve (9), and the other is connected to the second valve (2) through the tenth valve (10); The output end of the ground source cold storage buried pipe system (25) is connected to the inlet of the cold storage buffer tank (26), and the outlet of the cold storage buffer tank (26) is divided into two paths, one of which is connected to the inlet of the cold storage medium storage tank (28), and the other is connected to the refrigeration unit (24) through the twelfth valve (12) and the thirteenth valve (13) connected in parallel; the outlet of the cold storage medium storage tank (28) is connected to the input end of the ground source cold storage buried pipe system (25) through the fifth valve (5) and the sixth valve (6) in sequence; the refrigeration unit (24) is connected to the input end of the ground source cold storage buried pipe system (25) through the eleventh valve (11); The evaporator (22) is connected to the refrigeration unit (24), and the air cooler (19) is connected to the heating unit (18); the output end of the evaporator (22) is connected to the input end of the ground source heat storage buried pipe system (15) through the carbon dioxide storage tank (21), the compressor (20), the air cooler (19), and the eighth valve (8) in sequence; the output end of the air cooler (19) is connected to the refrigeration unit (24) through the expansion throttling device (23), the evaporator (22), and the fourteenth valve (14).

2. The cross-seasonal composite ground source heat pump energy storage device according to claim 1, characterized in that: A first circulation pump (17) is provided between the second valve (2) and the first valve (1).

3. The cross-seasonal composite ground source heat pump energy storage device according to claim 2, characterized in that: A second circulation pump (27) is provided between the sixth valve (6) and the fifth valve (5).

4. The cross-seasonal composite ground source heat pump energy storage device according to claim 1, characterized in that: The waste heat furnace (30) is a waste heat furnace for coal chemical industry, garbage dump, or power plant.

Images