Direct / indirect coupled air-cooled energy storage ice air conditioning system and control method thereof

Abstract

The application provides a direct / indirect coupling air cold energy cross-season ice storage air conditioning system and a control method thereof. The system comprises an air cooler, an evaporator, a condenser, a throttle valve, a compressor, an ice storage refrigerant water circulating pump and an underground ice storage pool. The application stores the air cold energy in winter environment, and releases the air cold energy stored in winter to supply cold in summer and transition seasons. The cross-season ice storage overcomes the difficulty in time and space use of the natural cold energy generated in winter, realizes reasonable development and use of the natural air cold energy, reduces the energy consumption of the air conditioning system as a whole, improves the refrigeration efficiency, and has remarkable energy-saving effect.

Description

Technical Field

[0001] This invention belongs to the technical field of air conditioning systems, specifically relating to a direct / indirect coupling air-cooled energy cross-seasonal ice storage air conditioning system and its control method. Background Technology

[0002] With the continued use of non-renewable energy sources such as fossil fuels, energy crises and environmental problems such as global warming have increased significantly. China has proposed to vigorously develop green, clean, and low-carbon renewable energy sources.

[0003] Cold energy is ubiquitous in the natural environment; wherever there is a temperature difference, there is energy. Nature's ability to maintain its environment is limitless, and temperature differences are infinite. Therefore, natural cold energy is a potentially enormous low-grade energy source, belonging to clean and renewable energy sources such as solar, wind, and geothermal energy. However, people often overlook the utilization of natural air cold energy in the environment. Furthermore, compared to cross-seasonal heat storage, especially for air conditioning systems, research and utilization of natural air cold energy across seasons are relatively limited.

[0004] Building energy consumption has consistently accounted for a high proportion of national energy consumption, with air conditioning consuming more than half of it. Therefore, energy conservation and emission reduction in air conditioning systems are imperative. Traditional air conditioning systems often rely solely on chillers for cooling during summer and transitional seasons, resulting in high energy consumption. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a novel direct / indirect coupling air-cooled energy cross-seasonal ice storage air conditioning system.

[0006] The technical solution of the present invention is as follows: A direct / indirect coupling air-cooled energy cross-seasonal ice storage air conditioning system includes an air cooler, an evaporator, a condenser, a throttling valve, a compressor, an ice storage refrigerant water circulation pump, and an underground ice storage tank.

[0007] The air cooler inlet is connected to the outlet of the ice storage refrigerant water circulation pump; the air cooler outlet is connected to the inlet of the underground ice storage tank; the underground ice storage tank outlet is connected to the inlet of the ice storage refrigerant water circulation pump; the ice storage refrigerant water circulation pump outlet is also connected to the refrigerant water inlet of the condenser; the air cooler outlet is also connected to the refrigerant water inlet of the evaporator; and the evaporator refrigerant water outlet is connected to the inlet of the underground ice storage tank. The working fluid outlet of the evaporator is connected to the working fluid inlet of the compressor; the working fluid outlet of the compressor is connected to the working fluid inlet of the condenser; the working fluid outlet of the condenser is connected to the inlet of the throttle valve; and the outlet of the throttle valve is connected to the working fluid inlet of the evaporator.

[0008] The direct / indirect coupling air-cooled energy cross-seasonal ice storage air conditioning system also includes a refrigerant water circulation pump. The outlet of the refrigerant water circulation pump is connected to the refrigerant water inlet of the evaporator and the underground ice storage tank, respectively. The inlet of the refrigerant water circulation pump is connected to the refrigerant water source.

[0009] The underground ice storage pool is also equipped with an insulation layer.

[0010] A first valve, a second valve, and a third valve are sequentially installed on the pipe connecting the outlet of the air cooler to the inlet of the underground ice storage tank; an eighth valve is installed on the branch connecting the outlet of the air cooler to the inlet of the evaporator refrigerant water; a fourth valve is installed on the pipe connecting the outlet of the underground ice storage tank to the inlet of the ice storage refrigerant water circulation pump; a fifth valve is installed on the branch connecting the outlet of the ice storage refrigerant water circulation pump to the inlet of the air cooler; a sixth valve is installed on the branch connecting the outlet of the ice storage refrigerant water circulation pump to the inlet of the evaporator refrigerant water; and a sixth valve is installed on the pipe connecting the outlet of the ice storage refrigerant water circulation pump to the inlet of the condenser refrigerant water. A ninth valve is installed on the pipeline; a seventh valve is installed on the pipeline connecting the refrigerant water outlet of the evaporator to the inlet of the underground ice storage tank; a tenth valve is installed on the pipeline connecting the refrigerant water outlet of the condenser to the inlet of the underground ice storage tank; a thirteenth valve is installed on the branch line connecting the outlet of the refrigerant water circulation pump to the refrigerant water inlet of the evaporator; an eleventh valve is installed on the pipeline connecting the outlet of the refrigerant water circulation pump to the inlet of the underground ice storage tank; a fourteenth valve is installed on the pipeline directly supplying cooling to the evaporator; and a twelfth valve is installed on the pipeline directly supplying cooling to the outlet of the underground ice storage tank.

[0011] The control method for a direct / indirect coupling inter-seasonal ice storage air conditioning system includes the following steps: When performing direct ice storage, valves 1, 2, 3, 4, and 5 are open, while valves 6, 7, 8, 9, 10, 11, 12, 13, and 14 are closed. In direct / indirect coupled ice storage, valves 2, 3, 4, 5, 7, and 8 are open, while valves 1, 6, 9, 10, 11, 12, 13, and 14 are closed. In indirect ice storage, valves 2, 3, 4, 6, and 7 are open, while valves 1, 5, 8, 9, 10, 11, 12, 13, and 14 are closed. When direct cooling is applied, valves 3, 11, and 12 are opened, while valves 1, 2, 4, 5, 6, 7, 8, 9, 10, 13, and 14 remain closed. When indirect cooling is applied, valves 2, 3, 4, 9, and 10 are opened, valves 12 and 13 are open, and valves 1, 5, 6, 7, 8, and 14 are closed.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Cross-seasonal cold storage involves storing the cold air energy generated in the winter environment and releasing it for cooling during the summer and transitional seasons. Cross-seasonal cold storage overcomes the difficulties in utilizing natural cold energy generated in winter in terms of both time and space, achieving the rational development and utilization of natural air cold energy. This reduces the overall energy consumption of the air conditioning system, improves cooling efficiency, and results in significant energy savings.

[0013] 2. By coupling the air cooler and the refrigeration unit, and by opening and closing different valves, the system can flexibly switch between direct / indirect cold storage and cold release modes, ensuring normal operation of the system under different application conditions and demonstrating strong applicability.

[0014] 3. By employing a direct / indirect coupling method for storing and releasing cold energy, a tiered utilization of cold energy is achieved. If the temperature of the underground ice storage pool meets the cooling demand, the cold energy is directly released for cooling. If the temperature of the underground ice storage pool, after the release of cold energy, can no longer meet the cooling demand, it can be used as a high-quality cold source as cooling water for the condenser of the refrigeration unit to cool the condenser. Finally, the refrigeration unit directly produces cold energy for cooling, realizing the indirect use of the cold energy in the underground ice storage pool and the rational use of cold energy of different grades, reducing irreversible losses in the process of cold energy utilization.

[0015] 4. An insulation layer was installed on the outside of the underground ice storage tank to ensure the stability of the temperature inside the tank, enhance its thermal insulation capacity, and reduce the loss of cold energy. Meanwhile, traditional air conditioning systems generally do not consider the flexibility of system energy consumption, and the application of energy storage technology in air conditioning systems is relatively limited, leading to problems such as insufficient capacity of air conditioning systems to accommodate renewable energy sources. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a direct / indirect coupling cross-seasonal air-cooled energy storage and air conditioning system.

[0017] In the diagram: 1-Air cooler; 2-Ice storage refrigerant water circulation pump; 3-Evaporator; 4-Compressor; 5-Condenser; 6-Throttle valve; 7-Cooling refrigerant water circulation pump; 8-Underground ice storage tank; 9-Insulation layer; V1~V14-First to fourteenth valves. Detailed Implementation

[0018] To make the invention easier to understand, the following is combined with Figure 1 The technical solutions of the present invention will be described in detail with reference to specific embodiments, but this does not limit the scope of protection claimed by the present application.

[0019] like Figure 1 The direct / indirect coupling cross-seasonal air-cooled energy storage and air conditioning system shown includes an air cooler 1, an ice storage refrigerant water circulation pump 2, an evaporator 3, a compressor 4, a condenser 5, a throttling valve 6, a cold release refrigerant water circulation pump 7, an underground ice storage tank 8, an insulation layer 9, and the first to fourteenth valves V1~V14.

[0020] A first valve V1, a second valve V2, and a third valve V3 are installed on the pipe connecting the outlet of air cooler 1 to the inlet of underground ice storage tank 8; an eighth valve V8 is installed on the branch connecting the outlet of air cooler 1 to the refrigerant water inlet of evaporator 3; a fourth valve V4 is installed on the pipe connecting the outlet of underground ice storage tank 8 to the inlet of ice storage refrigerant water circulation pump 2; a fifth valve V5 is installed on the branch connecting the outlet of ice storage refrigerant water circulation pump 2 to the inlet of air cooler 1; a sixth valve V6 is installed on the branch connecting the outlet of ice storage refrigerant water circulation pump 2 to the refrigerant water inlet of evaporator 3; and a third valve V4 is installed on the pipe connecting the outlet of ice storage refrigerant water circulation pump 2 to the refrigerant water inlet of condenser 5. A ninth valve, V9, is installed on the connecting pipeline; a seventh valve, V7, is installed on the pipeline connecting the chilled water outlet of evaporator 3 to the inlet of underground ice storage tank 8; a tenth valve, V10, is installed on the pipeline connecting the chilled water outlet of condenser 5 to the inlet of underground ice storage tank 8; a thirteenth valve, V13, is installed on the branch line connecting the outlet of the chilled water circulation pump 7 to evaporator 3; an eleventh valve, V11, is installed on the pipeline connecting the outlet of the chilled water circulation pump 7 to the inlet of underground ice storage tank 8; a fourteenth valve, V14, is installed on the pipeline that directly supplies cooling to evaporator 3; and a twelfth valve, V12, is installed on the pipeline that directly supplies cooling to the outlet of underground ice storage tank 8.

[0021] In this embodiment, the outlet of the air cooler 1 is connected to the inlets of valves V1 and V8, the outlet of valve V1 is connected to the inlet of valve V2, the outlet of valve V2 is connected to the inlet of valve V3, the outlet of valve V3 is connected to the inlet of the underground ice storage tank 8, the outlet of the underground ice storage tank 8 is connected to the inlets of valves V4 and V12, the outlet of valve V4 is connected to the ice storage refrigerant water circulation pump 2, the outlet of the ice storage refrigerant water circulation pump 2 is connected to the inlets of valves V5, V6, and V9, the outlet of valve V5 is connected to the inlet of the air cooler 1, the outlet of valve V6 is connected to the refrigerant water inlet of the evaporator 3, the refrigerant water outlet of the evaporator 3 is connected to the inlet of valve V7, and the outlet of valve V7 is connected to the outlet of valve V1 and valve V2. The outlet of valve V9 is connected to the refrigerant water inlet of condenser 5, the refrigerant water outlet of condenser 5 is connected to the inlet of valve V10, and the outlet of valve V10 is connected to the outlet of valve V7, the outlet of valve V1, and the inlet of valve V2. The outlet of the refrigerant water circulation pump 7 is connected to the inlets of valve V11 and valve V13, the outlet of valve V11 is connected to the inlet of valve V3 and the outlet of valve V2, the outlet of valve V3 is connected to the underground ice storage tank 8, the underground ice storage tank 8 is connected to the inlets of valve V4 and valve V12, the outlet of valve V12 is connected to the outlet of valve V14, the outlet of valve V13 is connected to the refrigerant water inlet of evaporator 3, and the refrigerant water outlet of evaporator 3 is connected to the inlet of valve V14.

[0022] This invention enables the cross-seasonal development and utilization of natural air cold energy, and by flexibly switching between different direct and indirect ice storage and cold release system modes, it achieves the cascade utilization of cold energy and reduces irreversible losses in the process of cold energy utilization.

[0023] The outlet of the air cooler 1 is connected to the inlet of the underground ice storage tank 8 for direct ice storage; the outlet of the air cooler 1 is connected to the chilled water inlet of the evaporator 3 for direct / indirect coupled ice storage; the chilled water outlet of the evaporator 3 is connected to the inlet of the underground ice storage tank 8 for indirect ice storage.

[0024] If the outdoor air temperature is below 0℃ in winter, the air conditioning system will directly store ice, storing the cold energy of the air directly into the underground ice storage tank 8 through the air cooler 1. At this time, the first valve, the second valve, the third valve, the fourth valve, and the fifth valves V1, V2, V3, V4, and V5 are opened, and the fifth valve, the sixth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve, the eleventh valve, the twelfth valve, the thirteenth valve, and the fourteenth valves V5, V6, V7, V8, V9, V10, V11, V12, V13, and V14 are closed.

[0025] If the outdoor air temperature is above 0℃ in winter, the air conditioning system will perform direct / indirect ice storage. Ice storage is achieved by coupling the air cooler 1 and the evaporator 3 of the refrigeration unit. Under the action of the refrigerant water circulation pump 2, the refrigerant water first passes through the air cooler 1 to pre-cool the refrigerant water before it enters the evaporator 3 of the refrigeration unit, and then enters the refrigeration unit. Finally, the cooling capacity produced by the refrigeration unit is stored in the underground ice storage tank 8. At this time, valves V2, V3, V4, V5, V7 and V8 are opened, and valves V1, V6, V9, V10, V11, V12, V13 and V14 are closed.

[0026] During summer and transitional seasons, due to high outdoor temperatures and the difficulty in obtaining natural cooling energy, the air conditioning system can indirectly store ice. Alternatively, it can utilize off-peak electricity loads at night to store ice directly in the underground ice storage tank 8. At this time, valves 2, 3, 4, 6, and 7 (V2, V3, V4, V6, and V7) are opened, while valves 1, 5, 8, 9, 10, 11, 12, 13, and 14 (V1, V5, V8, V9, V10, V11, V12, V13, and V14) are closed.

[0027] During summer and transitional seasons, the cold energy stored in winter is released for cooling. If the temperature of the underground ice storage tank is low enough to meet the cooling requirements, the air conditioning system directly releases cold energy. Under the action of the chilled water circulation pump 7, the chilled water directly exchanges heat with the ice stored in the underground ice storage tank 8, directly releasing the cold energy stored in the underground ice storage tank for cooling. At this time, the third, eleventh, and twelfth valves V3, V11, and V12 are opened, and the first, second, fourth, fifth, sixth, seventh, eighth, ninth, tenth, thirteenth, and fourteenth valves V1, V2, V4, V5, V6, V7, V8, V9, V10, V13, and V14 are closed.

[0028] If the cold energy in the underground ice storage tank 8 is continuously released, the temperature inside the underground ice storage tank 8 will continuously rise. When the temperature no longer meets the cooling requirements, the air conditioning system will indirectly release cold energy, using it as a high-quality cold source to provide stable cooling water for the condenser 5 in the refrigeration unit. The cold energy will be directly generated by the refrigeration unit for cooling. At this time, valves V2, V3, V4, V9, V10, V12, and V13 will be opened, and valves V1, V5, V6, V7, V8, and V14 will be closed.

[0029] The above are merely preferred embodiments of the present invention, but the present invention is not limited to the specific embodiments described above. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A direct / indirect coupling air-cooled energy transseasonal ice storage air conditioning system, characterized in that, include: Air cooler (1), evaporator (3), condenser (5), throttle valve (6), compressor (4), ice storage refrigerant water circulation pump (2) and underground ice storage tank (8). The inlet of the air cooler (1) is connected to the outlet of the ice storage refrigerant water circulation pump (2), the outlet of the air cooler (1) is connected to the inlet of the underground ice storage tank (8), the outlet of the underground ice storage tank (8) is connected to the inlet of the ice storage refrigerant water circulation pump (2), the outlet of the ice storage refrigerant water circulation pump (2) is also connected to the refrigerant water inlet of the condenser (5); the outlet of the air cooler (1) is also connected to the refrigerant water inlet of the evaporator (3); the refrigerant water outlet of the evaporator (3) is connected to the inlet of the underground ice storage tank (8). The working fluid outlet of the evaporator (3) is connected to the working fluid inlet of the compressor (4); the working fluid outlet of the compressor (4) is connected to the working fluid inlet of the condenser (5); the working fluid outlet of the condenser (5) is connected to the inlet of the throttle valve (6); and the outlet of the throttle valve (6) is connected to the working fluid inlet of the evaporator (3).

2. The direct / indirect coupling air-cooled energy transseasonal ice storage air conditioning system according to claim 1, characterized in that, It also includes a cooling refrigerant water circulation pump (7), the outlet of which is connected to the refrigerant water inlet of the evaporator (3) and the underground ice storage tank (8), and the inlet of which is connected to the refrigerant water source.

3. The direct / indirect coupling air-cooled energy transseasonal ice storage air conditioning system according to claim 1, characterized in that, The underground ice storage pool (8) is also provided with an insulation layer (9).

4. The direct / indirect coupling air-cooled energy transseasonal ice storage air conditioning system according to claim 2, characterized in that, A first valve (V1), a second valve (V2), and a third valve (V3) are sequentially installed on the pipeline connecting the outlet of the air cooler (1) to the inlet of the underground ice storage tank (8); an eighth valve (V8) is installed on the branch line connecting the outlet of the air cooler (1) to the refrigerant water inlet of the evaporator (3); a fourth valve (V4) is installed on the pipeline connecting the outlet of the underground ice storage tank (8) to the inlet of the ice storage refrigerant water circulation pump (2); the outlet of the ice storage refrigerant water circulation pump (2) and the air cooler (1) are connected to the inlet of the evaporator (3). 1) A fifth valve (V5) is installed on the branch connecting the inlet; a sixth valve (V6) is installed on the branch connecting the outlet of the ice storage refrigerant water circulation pump (2) to the refrigerant water inlet of the evaporator (3); a ninth valve (V9) is installed on the pipe connecting the outlet of the ice storage refrigerant water circulation pump (2) to the refrigerant water inlet of the condenser (5); a seventh valve (V7) is installed on the pipe connecting the refrigerant water outlet of the evaporator (3) to the inlet of the underground ice storage tank (8), and the outlet of the seventh valve (V7) is respectively connected to the first The outlet of valve (V1) is connected to the inlet of the second valve (V2); a tenth valve (V10) is installed on the pipeline connecting the refrigerant water outlet of the condenser (5) to the inlet of the underground ice storage tank (8), and the outlet of the tenth valve (V10) is connected to the outlet of the seventh valve (V7), the outlet of the first valve (V1), and the inlet of the second valve (V2) respectively; a thirteenth valve (V13) is installed on the branch connecting the outlet of the refrigerant water circulation pump (7) to the refrigerant water inlet of the evaporator (3). The outlet of the cooling medium circulating pump (7) is connected to the inlet of the underground ice storage tank (8) by an eleventh valve (V11). The outlet of the eleventh valve (V11) is connected to the inlet of the third valve (V3) and the outlet of the second valve (V2), respectively. The fourteenth valve (V14) is installed on the pipeline directly supplying cooling to the outlet of the evaporator (3). The twelfth valve (V12) is installed on the pipeline directly supplying cooling to the outlet of the underground ice storage tank (8).

5. A control method for a direct / indirect coupling air-cooled energy interseasonal ice storage air conditioning system according to claim 4, characterized in that, Includes the following steps: When performing direct ice storage, valves 1 (V1), 2 (V2), 3 (V3), 4 (V4), and 5 (V5) are open, while valves 6 (V6), 7 (V7), 8 (V8), 9 (V9), 10 (V10), 11 (V11), 12 (V12), 13 (V13), and 14 (V14) are closed. In direct / indirect coupled ice storage, valves 2 (V2), 3 (V3), 4 (V4), 5 (V5), 7 (V7), and 8 (V8) are open, while valves 1 (V10), 2 (V11), 3 (V12), 4 (V13), and 5 (V14) are closed. The sixth valve (V6), ninth valve (V9), tenth valve (V10), eleventh valve (V11), twelfth valve (V12), thirteenth valve (V13), and fourteenth valve (V14) are closed. In the indirect ice storage condition, the second valve (V2), third valve (V3), fourth valve (V4), sixth valve (V6), and seventh valve (V7) are opened, while the first valve (V1), fifth valve (V5), eighth valve (V8), ninth valve (V9), tenth valve (V10), eleventh valve (V11), twelfth valve (V12), thirteenth valve (V13), and fourteenth valve (V14) are closed. During direct cooling, valves 3 (V3), 11 (V11), and 12 (V12) are opened, while valves 1 (V1), 2 (V2), 4 (V4), 5 (V5), 6 (V6), 7 (V7), 8 (V8), 9 (V9), 10 (V10), 13 (V13), and 14 (V14) remain closed. During indirect cooling, valves 2 (V2), 3 (V3), 4 (V4), 9 (V9), and 10 (V10) are opened, while valves 13 (V13) and 14 (V14) are open, and valves 1 (V1), 5 (V5), 6 (V6), 7 (V7), 8 (V8), and 12 (V12) remain closed.

Images