Air-water non-contact heating and cooling system

Abstract

The utility model relates to an air-water non-contact heating and cooling system, which aims to solve the technical problems of energy waste of peak-valley difference and poorer performance of an air source heat pump in a low-temperature environment, and adopts the technical scheme that the air-water non-contact heating and cooling system comprises an ice tank, an air heat exchanger, an evaporator, a condenser, an energy storage water tank, a four-way reversing valve and a compressor, the ice tank and the evaporator are connected to form a circulation loop, a branch is branched from a pipeline between the ice tank and the evaporator to be connected with the air heat exchanger, the ice tank and the energy storage water tank are connected to form a circulation loop, a branch is branched from a pipeline between the ice tank and the energy storage water tank to be connected with the condenser, and the evaporator is connected with the condenser sequentially through the compressor and the four-way reversing valve. The condenser is connected with the evaporator through an expansion valve, the energy storage water tank is connected with a user side to form a loop, and a plurality of power valves and circulating pumps are arranged on each circulating loop; according to the utility model, the energy storage measure can effectively utilize the peak-valley electricity price difference and save the electricity cost on the premise of meeting the requirement of cold (heat) supply of the terminal.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and particularly relates to an air-water non-contact heating and cooling system. Background Technique

[0002] Phase change energy storage utilizes the heat storage characteristics of phase change materials. Based on the change in the thermodynamic state such as enthalpy during the phase change process of the material, it regulates and controls the temperature of the surrounding environment by storing and releasing heat, thereby improving the energy utilization efficiency. In the field of architecture, phase change energy storage materials are widely used in large-capacity cold storage and heat storage systems, usually integrated with heating systems or building materials to become part of the building.

[0003] Heat pump systems are widely used in modern buildings and industries mainly because they can efficiently convert low-temperature heat sources into high-temperature heat sources, thus realizing functions such as heating, cooling, and hot water. However, there are significant differences in energy supply demand at different times, and there is usually a large fluctuation between the peak period of electricity use (i.e., "peak") and the valley period of electricity use (i.e., "valley"). This peak-valley difference will lead to unbalanced energy utilization and cause waste. In a low-temperature environment, the performance of air-source heat pumps will be affected. Especially in extremely cold conditions, the heat exchange efficiency of air-source heat pumps will decrease significantly, and at the same time, it may also cause frosting of the system, further reducing the heating efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the above problems and provide an air-water non-contact heating and cooling system.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is:

[0006] An air-water non-contact heating and cooling system includes an ice tank, an air heat exchanger, an evaporator, a condenser, a heat storage water tank, a four-way reversing valve, and a compressor. The inlet and outlet of the ice tank are connected to the inlet and outlet of the evaporator to form a circulation loop. Branches are separated from the pipeline between the ice tank and the evaporator and are respectively connected to the inlet and outlet of the air heat exchanger. The inlet and outlet of the ice tank are connected to the inlet and outlet of the heat storage water tank to form a circulation loop. Branches are separated from the pipeline between the ice tank and the heat storage water tank and are respectively connected to the inlet and outlet of the condenser. The evaporator outlet is sequentially connected to the condenser inlet through the compressor and the four-way reversing valve. The condenser outlet is connected to the evaporator inlet through an expansion valve. The inlet and outlet of the heat storage water tank are connected to the inlet and outlet of the user end to form a circulation loop;

[0007] A first power valve is provided on the pipeline between the ice tank outlet and the air heat exchanger inlet. A fifth circulation pump and a thirteenth power valve are provided on the loop pipeline between the air heat exchanger and the ice tank. A third circulation pump and a second power valve are provided on the pipeline between the air heat exchanger outlet and the evaporator inlet. An eleventh power valve is provided on the loop pipeline between the evaporator and the air heat exchanger. A third power valve is provided on the pipeline between the ice tank outlet and the condenser inlet. A fourth circulation pump and a tenth power valve are provided on the loop pipeline between the condenser and the ice tank. An eighth power valve is provided on the loop pipeline between the energy storage water tank and the ice tank. A first circulation pump and a ninth power valve are provided on the branch pipeline between the condenser outlet and the energy storage water tank inlet. A fourth power valve is provided on the loop pipeline between the energy storage water tank and the condenser. A second circulation pump and a fifth power valve are provided on the pipeline between the energy storage water tank outlet and the user end inlet. A sixth power valve is provided on the loop pipeline between the user end and the energy storage water tank. A first branch is formed by connecting the eighth power valve and the sixth power valve through a pipeline, and a seventh power valve is provided thereon. A second branch is branched from the pipeline outside the fourth circulation pump and the tenth power valve. A fourteenth power valve is provided on the second branch. The air heat exchanger outlet is connected to the second branch through a third branch, and a twelfth power valve is provided on the third branch.

[0008] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0009] 1. The present utility model adopts the ice storage cooling technology, which can utilize the low valley time of the night power grid to store the heat generated by making ice with the refrigerant. During the peak electricity consumption period during the day, the ice melts, and the latent heat of phase change of the ice is used for cooling. The energy storage measure of the present utility model can effectively utilize the peak-valley electricity price difference and save the electricity cost on the premise of meeting the terminal cooling (heating) needs;

[0010] 2. The present utility model can "shift the peak and fill the valley" for the power supply system, solve the problem of power waste during the night low valley period, and play a certain role in regulating the power grid supply and demand balance.

[0011] 3. The present utility model combines the ice storage cooling technology with the air source heat pump system, which can significantly improve the performance of the air source heat pump in low temperature environments. Description of the Drawings

[0012] Figure 1 is a schematic diagram of the system structure of the present utility model;

[0013] Figure 2 is a schematic diagram of the working state of the present utility model for heating at night in winter;

[0014] Figure 3 is a schematic diagram of the working state of the present utility model for heating during the day in winter;

[0015] Figure 4Schematic diagram of the operation of the present utility model for cooling at night in summer;

[0016] Figure 5 Schematic diagram of the operation of the present utility model for cooling during the day in summer;

[0017] In the figure, 1. ice tank; 2. air heat exchanger; 3. evaporator; 4. condenser; 5. energy storage water tank; 6. user end; 7. four-way reversing valve; 8. compressor; 9. expansion valve; 10. first circulation pump; 11. second circulation pump; 12. third circulation pump; 13. fourth circulation pump; 14. fifth circulation pump; 15. first power valve; 16. second power valve; 17. third power valve; 18. fourth power valve; 19. fifth power valve; 20. sixth power valve; 21. seventh power valve; 22. eighth power valve; 23. ninth power valve; 24. tenth power valve; 25. eleventh power valve; 26. twelfth power valve; 27. thirteenth power valve; 28. fourteenth power valve; 29. first branch; 30. second branch; 31. third branch. Specific embodiments

[0018] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] Embodiment

[0020] As Figures 1-5As shown in the figure, an air-water non-contact heating and cooling system includes an ice tank 1, an air heat exchanger 2, an evaporator 3, a condenser 4, a heat storage water tank 5, a four-way reversing valve 7, and a compressor 8. The inlet and outlet of the ice tank 1 are connected to the inlet and outlet of the evaporator 3 to form a circulation loop, which can freeze and release heat to supply the heat required for the evaporation and heat absorption of the evaporator 3. When the air temperature is high, the heat of the outdoor air is supplied to the evaporator for evaporation and heat absorption. Branches are separated on the pipeline between the ice tank 1 and the evaporator 3 and are respectively connected to the inlet and outlet of the air heat exchanger 2, which can absorb the heat of the outdoor air to melt the ice. The inlet and outlet of the ice tank 1 are connected to the inlet and outlet of the heat storage water tank 5 to form a circulation loop, and heat exchange is carried out with the water in the heat storage water tank 5 through phase change heat absorption and heat release. When absorbing heat, the water in the heat storage water tank 5 is refrigerated, and when releasing heat, the water in the heat storage water tank 5 is heated. Branches are separated on the pipeline between the ice tank 1 and the heat storage water tank 5 and are respectively connected to the inlet and outlet of the condenser 4, supplying heat when the evaporator 3 evaporates and absorbs heat, refrigerating the water in the heat storage water tank 5, and absorbing its heat when the condenser 4 condenses and releases heat, heating the water in the heat storage water tank 5. The outlet of the evaporator 3 is sequentially connected to the inlet of the condenser 4 through the compressor 8 and the four-way reversing valve 7. The low-temperature and low-pressure gas from the evaporator 3 is compressed and boosted to high-temperature and high-pressure steam by the compressor 8. The high-temperature and high-pressure steam from the compressor 8 releases heat and liquefies into medium-temperature and high-pressure liquid in the condenser 4. The outlet of the condenser 4 is connected to the inlet of the evaporator 3 through an expansion valve 9, and the medium-temperature and high-pressure liquid is throttled and depressurized to low-temperature and low-pressure liquid by the expansion valve 9. The inlet and outlet of the heat storage water tank 5 are connected to the inlet and outlet of the user terminal 6 to form a circulation loop for terminal heating and cooling;

[0021] A first power valve 15 is provided on the pipeline between the outlet of the ice tank 1 and the inlet of the air heat exchanger 2. A fifth circulation pump 14 and a thirteenth power valve 27 are provided on the loop pipeline between the air heat exchanger 2 and the ice tank 1. A third circulation pump 12 and a second power valve 16 are provided on the pipeline between the outlet of the air heat exchanger 2 and the inlet of the evaporator 3. An eleventh power valve 25 is provided on the loop pipeline between the evaporator 3 and the air heat exchanger 2. A third power valve 17 is provided on the pipeline between the outlet of the ice tank 1 and the inlet of the condenser 4. A fourth circulation pump 13 and a tenth power valve 24 are provided on the loop pipeline between the condenser 4 and the ice tank 1. An eighth power valve 22 is provided on the loop pipeline between the energy storage water tank 5 and the ice tank 1. A first circulation pump 10 and a ninth power valve 23 are provided on the branch pipeline between the outlet of the condenser 4 and the inlet of the energy storage water tank 5. A fourth power valve 18 is provided on the loop pipeline between the energy storage water tank 5 and the condenser 4. A second circulation pump 11 and a fifth power valve 19 are provided on the pipeline between the outlet of the energy storage water tank 5 and the inlet of the user end 6. A sixth power valve 20 is provided on the loop pipeline between the user end 6 and the energy storage water tank 5. A first branch 29 is formed by connecting the eighth power valve 22 and the sixth power valve 20 through a pipeline, and a seventh power valve 21 is provided thereon. A second branch 30 is branched out from the pipeline outside the fourth circulation pump 13 and the tenth power valve 24. A fourteenth power valve 28 is provided on the second branch 30. The air heat exchanger 2 is connected to the second branch 30 through a third branch 31, and a twelfth power valve 26 is provided on the third branch 31.

[0022] The working process of the present utility model:

[0023] As Figure 2 shown, when the outdoor temperature is relatively high at night in winter, the third power valve 17, the eighth power valve 22 and the tenth power valve 24 are closed. The refrigerant in the evaporator 3 forms a circulation loop through the eleventh power valve 25, the third circulation pump 12 and the second power valve 16, and absorbs the heat in the outdoor air through the air heat exchanger 2;

[0024] When the outdoor temperature is relatively low, the phase change material in the ice tank 1 undergoes a phase change to freeze and release heat. The refrigerant in the evaporator 3 forms a circulation loop through the first power valve 15, the second power valve 16, the third circulation pump 12, the eleventh power valve 25, the twelfth power valve 26, and the fourteenth power valve 28, absorbs the heat released by the ice tank 1 and vaporizes into a low-temperature and low-pressure gas. Then, it is compressed by the compressor 8 to a high-temperature and high-pressure steam, enters the condenser 4 through the four-way reversing valve 7 to liquefy and release heat, and exchanges heat with the water in the energy storage water tank 5. After that, the hot water returns to the energy storage water tank 5 through the ninth power valve 23 and the first circulation pump 10, storing the heat in the energy storage water tank 5. The low-temperature water in the energy storage water tank 5 returns to the condenser 4 through the fourth power valve 18 to continue the heat exchange. The steam in the condenser 4 releases heat and liquefies into a medium-temperature and high-pressure liquid, then enters the expansion valve 9, is throttled and depressurized to a low-temperature and low-pressure liquid, and enters the evaporator 3, absorbing heat and vaporizing into a low-temperature and low-pressure gas. The heat absorption during vaporization is obtained through the ice tank 1 or the air heat exchanger 2, and the first power valve 15, the second power valve 16, the third circulation pump 12, the eleventh power valve 25, the twelfth power valve 26, and the thirteenth power valve 27 constitute the heat exchange cycle between the evaporator 3 and the external medium;

[0025] As Figure 3 shown, during the day in winter, the second power valve 16, the fourth power valve 18, the eighth power valve 22, the ninth power valve 23, the eleventh power valve 25, the twelfth power valve 26, and the fourteenth power valve 28 are closed. The hot water in the energy storage water tank 5 is supplied to the user terminal 6 through the fifth power valve 19 and the second circulation pump 11. After exchanging heat with the user terminal 6, it returns to the energy storage water tank 5 through the sixth power valve 20. At the same time, the waste heat in the user bypass is recovered and returned to the ice tank 1 through the seventh power valve 21, the tenth power valve 24, and the fourth circulation pump 13 for ice melting. In addition, the outdoor air heat is used for ice melting through the air heat exchanger 2, and the first power valve 15, the thirteenth power valve 27, and the fifth circulation pump 14 constitute the ice melting circulation loop;

[0026] As Figure 4 shown, during the night in summer, the first power valve 15, the twelfth power valve 26, the thirteenth power valve 27, and the fourteenth power valve 28 are closed. The flow direction of the refrigerant is switched through the four-way reversing valve 7. In the compressor 8, the low-temperature and low-pressure gas from the evaporator 3 is compressed and boosted to a high-temperature and high-pressure steam, enters the condenser 4, releases heat and liquefies into a medium-temperature and high-pressure liquid; the heat released during liquefaction is discharged to the outdoor air through the air heat exchanger 2, and the third circulation pump 12, the second power valve 16, and the eleventh power valve 25 constitute the heat exchange cycle; the liquefied refrigerant enters the expansion valve 9, is throttled and depressurized to a low-temperature and low-pressure liquid; enters the evaporator 4, absorbs heat and vaporizes into a low-temperature and low-pressure gas; at this time, the phase change of the ice tank 1 freezes and releases heat, and at the same time, the water in the energy storage water tank 5 exchanges heat with the refrigerant in the evaporator, supplying the heat required by the evaporator 4, and the ice tank 1 and the energy storage water tank 5 store cold.

[0027] As Figure 5 shown, during the summer day, the cold water in the energy storage water tank 5 exchanges heat with the user end 6 through the fifth power valve 19 and the second circulation pump 11, and the water after heat exchange returns to the energy storage water tank 5 through the sixth power valve 20 to form a cycle; at the same time, the ice in the ice tank 1 absorbs heat by melting, refrigerates the water in the energy storage water tank 5 through the third power valve 17, and then forms a cycle through the eighth power valve 22, the tenth power valve 24 and the fourth circulation pump 13.

Claims

1. An air-water non-contact heating and cooling system, characterized in that, It includes an ice tank (1), an air heat exchanger (2), an evaporator (3), a condenser (4), a heat storage water tank (5), a four-way reversing valve (7) and a compressor (8). The inlet and outlet of the ice tank (1) are connected to the inlet and outlet of the evaporator (3) to form a circulation loop. Branches are separated from the pipeline between the ice tank (1) and the evaporator (3) and are respectively connected to the inlet and outlet of the air heat exchanger (2). The inlet and outlet of the ice tank (1) are connected to the inlet and outlet of the heat storage water tank (5) to form a circulation loop. Branches are separated from the pipeline between the ice tank (1) and the heat storage water tank (5) and are respectively connected to the inlet and outlet of the condenser (4). The outlet of the evaporator (3) is sequentially connected to the inlet of the condenser (4) through the compressor (8) and the four-way reversing valve (7). The outlet of the condenser (4) is connected to the inlet of the evaporator (3) through an expansion valve (9). The inlet and outlet of the heat storage water tank (5) are connected to the inlet and outlet of the user end (6) to form a circulation loop; A first power valve (15) is provided on the pipeline between the outlet of the ice tank (1) and the inlet of the air heat exchanger (2). A fifth circulation pump (14) and a thirteenth power valve (27) are provided on the loop pipeline between the air heat exchanger (2) and the ice tank (1). A third circulation pump (12) and a second power valve (16) are provided on the pipeline between the outlet of the air heat exchanger (2) and the inlet of the evaporator (3). An eleventh power valve (25) is provided on the loop pipeline between the evaporator (3) and the air heat exchanger (2). A third power valve (17) is provided on the pipeline between the outlet of the ice tank (1) and the inlet of the condenser (4). A fourth circulation pump (13) and a tenth power valve (24) are provided on the loop pipeline between the condenser (4) and the ice tank (1). An eighth power valve (22) is provided on the loop pipeline between the heat storage water tank (5) and the ice tank (1). A first circulation pump (10) and a ninth power valve (23) are provided on the branch pipeline between the outlet of the condenser (4) and the inlet of the heat storage water tank (5). A fourth power valve (18) is provided on the loop pipeline between the heat storage water tank (5) and the condenser (4). A second circulation pump (11) and a fifth power valve (19) are provided on the pipeline between the outlet of the heat storage water tank (5) and the inlet of the user end (6). A sixth power valve (20) is provided on the loop pipeline between the user end (6) and the heat storage water tank (5). A first branch (29) is formed by connecting through a pipeline between the eighth power valve (22) and the sixth power valve (20), and a seventh power valve (21) is provided thereon. A second branch (30) is separated from the pipeline outside the fourth circulation pump (13) and the tenth power valve (24). A fourteenth power valve (28) is provided on the second branch (30). The air heat exchanger (2) is connected to the second branch (30) through a third branch (31), and a twelfth power valve (26) is provided on the third branch (31).

Images