A parallel system of water-cooled dual-source air wall

Abstract

This utility model discloses a parallel system of a water-cooled dual-cold-source air wall, including a plate heat exchanger, two compressors, a refrigerant coil, a chilled water coil, and an EC fan. The plate heat exchanger and chilled water coil are provided with chilled water inlet and outlet ends, which are connected in parallel to the chilled water inlet and outlet pipes, respectively, forming a chilled water loop. This utility model connects the plate heat exchanger and chilled water coil in parallel, allowing all chilled water to enter the chilled water coil for natural cold source cooling. Alternatively, the chilled water can be divided into two paths: part enters the chilled water coil, and part enters the plate heat exchanger to remove heat from the high-temperature, high-pressure refrigerant, achieving mixed cooling. Alternatively, all chilled water can enter the plate heat exchanger for mechanical cooling. This system can fully utilize natural cold source cooling, simplify the refrigerant pump, improve unit energy efficiency, and meet energy-saving requirements.

Description

Technical Field

[0001] This utility model relates to the field of data center heat dissipation technology, and in particular to a parallel system of a water-cooled dual-source air wall. Background Technology

[0002] Currently, with the rapid development of the internet, the demand for heat dissipation in data centers is increasing, and the heat dissipation density is also increasing; this places higher demands on the energy efficiency of the cooling equipment used. Air conditioning compressors consume the most energy among all components; therefore, in cold seasons, especially in the autumn and winter in northern my country, natural cold sources can be fully utilized for cooling to achieve energy conservation.

[0003] While refrigerant pumps can utilize natural cooling sources to some extent—that is, using low-temperature air to condense the refrigerant—in natural cooling mode, without a compressor to provide power, the refrigerant cannot circulate through suction and discharge. Therefore, a refrigerant pump is required, increasing the unit's energy consumption to some extent.

[0004] To address the shortcomings of existing technologies, a parallel system of water-cooled dual-source air walls needs to be designed. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a parallel system for a water-cooled dual-source air wall.

[0006] A parallel system of a water-cooled dual-source air wall includes a plate heat exchanger, two compressors, a refrigerant coil, a chilled water coil, and an EC fan. The plate heat exchanger and chilled water coil are provided with chilled water inlet and outlet terminals, which are connected in parallel to the chilled water inlet and outlet pipes, respectively, to form a chilled water loop. Both the plate heat exchanger and the refrigerant coil are provided with two refrigerant inlet and outlet terminals, which are connected to each other through refrigerant inlet and outlet pipes, forming a refrigerant loop. The two compressors are respectively installed on the two refrigerant outlet pipes, and the EC fan is directed towards the chilled water coil.

[0007] Furthermore, the chilled water coil is arranged after the EC fan, and the refrigerant coil is arranged after the chilled water coil.

[0008] Furthermore, an electronic expansion valve is installed on the refrigerant inlet pipe.

[0009] Furthermore, a chilled water valve is installed on the chilled water output pipe of the chilled water coil.

[0010] Furthermore, a plate water exchange valve is installed on the chilled water output pipe of the plate heat exchanger. Beneficial effects

[0011] This invention connects the plate heat exchanger and chilled water coil in parallel, allowing all chilled water to enter the chilled water coil for natural cooling. Alternatively, the chilled water can be divided into two streams: part enters the chilled water coil, and the other part enters the plate heat exchanger to remove heat from the high-temperature, high-pressure refrigerant, achieving mixed cooling. Alternatively, all chilled water can enter the plate heat exchanger for mechanical cooling, ensuring the chilled water pipeline is always operational and never idle. This design couples the chilled water air wall system with the direct expansion refrigeration and air conditioning system, enabling three cooling modes: natural cooling mode, mixed mode, and mechanical cooling mode. This fully utilizes natural cooling, simplifies the refrigerant pump, improves unit energy efficiency, and meets energy-saving requirements.

[0012] This invention uses two compressors with refrigerant coils arranged in a cross or vertical manner to ensure that the refrigerants in the two compressors do not mix. At the same time, when return air enters the refrigerant coils, it can still be fully oriented to avoid high wind resistance and increased energy consumption. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the parallel system of the water-cooled dual-cold-source air wall of this utility model;

[0014] Figure 2 This is a schematic diagram of the natural cooling source mode of this utility model;

[0015] Figure 3 This is a schematic diagram of the hybrid mode principle of this utility model;

[0016] Figure 4 This is a schematic diagram of the mechanical refrigeration mode of this utility model;

[0017] In the picture:

[0018] 1. Plate heat exchanger; 2. Compressor; 3. Refrigerant coil; 4. Chilled water coil; 5. EC fan; 6. Electronic expansion valve; 7. Chilled water valve; 8. Plate heat exchanger valve. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please refer to Figures 1-4This embodiment proposes a parallel system of a water-cooled dual-source air wall, including a plate heat exchanger 1, two compressors 2, a refrigerant coil 3, a chilled water coil 4, and an EC fan 5. The plate heat exchanger 1 and the chilled water coil 4 are equipped with chilled water inlet and outlet terminals, which are connected in parallel to the chilled water inlet and outlet pipes, respectively, forming a chilled water loop. By connecting the plate heat exchanger 1 and the chilled water coil 4 in parallel, all the chilled water can enter the chilled water coil 4 to achieve natural cold source cooling. Alternatively, the chilled water can be divided into two paths: part enters the chilled water coil 4, and part enters the plate heat exchanger 1 to remove the heat from the high-temperature and high-pressure refrigerant, achieving mixed cooling. When all the chilled water enters the plate heat exchanger 1, mechanical cooling is achieved, and the chilled water pipeline is always in use and will not be idle.

[0021] Both the plate heat exchanger 1 and the refrigerant coil 3 are equipped with two refrigerant inlet and two refrigerant outlets. The plate heat exchanger 1 and the refrigerant coil 3 are connected by corresponding refrigerant inlet and refrigerant outlet pipes to form a refrigerant loop. The two compressors 2 are respectively installed on the two refrigerant outlet pipes. The airflow of the EC fan 5 is directed towards the chilled water coil 4. The chilled water coil 4 is arranged after the EC fan 5, and the refrigerant coil 3 is arranged after the chilled water coil 4. The chilled water coil 4 and the refrigerant coil 3 are arranged one after the other. The return air of the EC fan 5 must first pass through the chilled water coil 4 and then reach the refrigerant coil 3. The chilled water coil 4 can be used for pre-cooling, and then the air passes through the refrigerant coil 3 to achieve mixed cooling, which truly realizes the full utilization of natural cold source. At this time, the chilled water coil 4 is the main working unit and provides the cooling capacity. When the ambient temperature rises and the chilled water coil 4 can no longer meet the cooling demand, the compressor 2 is turned on, and the refrigerant coil 3 can be used to provide cooling. The chilled water then enters the plate heat exchanger 1 to exchange heat with the high-temperature and high-pressure refrigerant gas from the exhaust port of the compressor 2, acting as cooling water. By setting up two compressors 2 and arranging the refrigerant coils 3 in a cross or vertical arrangement, it is ensured that the refrigerants in the two compressors 2 will not mix. At the same time, when the return air enters the refrigerant coil 3, it can still be fully oriented to avoid high wind resistance and increased energy consumption.

[0022] This solution integrates a chilled water air wall system with a direct expansion refrigeration and air conditioning system, and has three cooling modes: natural cold source mode, hybrid mode, and mechanical refrigeration mode. It can make full use of natural cold source refrigeration, simplify the refrigerant pump, improve the unit's energy efficiency (CLF and COP), and achieve energy-saving requirements.

[0023] An electronic expansion valve 6 is installed on the refrigerant input pipeline, a chilled water valve 7 is installed on the chilled water output pipeline of the chilled water coil 4, and a plate heat exchanger valve 8 is installed on the chilled water output pipeline of the plate heat exchanger 1.

[0024] This solution can achieve three cooling modes based on the ambient temperature: natural cold source mode, hybrid mode, and mechanical cooling mode. In actual use, the temperature can be set according to the natural climate of the area. The temperature setting is as follows: natural cold source cooling mode temperature ≤ A℃ ≤ hybrid cooling mode temperature ≤ B℃ ≤ mechanical cooling mode temperature.

[0025] Natural cooling source mode: such as Figure 2 As shown, when the ambient temperature is lower than the set value A℃, the two compressors 2, plate heat exchanger 1, and electronic expansion valve 6 do not work, and the plate heat exchanger valve 8 is closed. At this time, chilled water enters the chilled water coil 4 through the chilled water inlet pipe and exchanges heat with the return air of the EC fan 5. The temperature of the chilled water rises and flows out through the chilled water valve 7, flows through the chilled water coil 4, and carries away the heat of the return air.

[0026] Mixed modes: such as Figure 3 As shown, when the ambient temperature is between A℃ and B℃, the chilled water valve 7 and the plate heat exchanger valve 8 open simultaneously, and the chilled water coil 4 and the refrigerant coil 3 work simultaneously. The return air from the EC fan 5 is first cooled by the chilled water coil 4, and then cooled again by the refrigerant coil 3. The working priority of the dual cold source coil of chilled water coil 4 and refrigerant coil 3 provided by this utility model is that of the chilled water coil 4, which tries to use natural cold source to provide cooling capacity to complete the refrigeration. If the cooling capacity demand cannot be met, the compressor 2 is turned on to supplement the cooling capacity with mechanical refrigeration.

[0027] Mechanical refrigeration mode: such as Figure 4 As shown, when the ambient temperature is higher than B℃, the chilled water valve 7 is not opened. The chilled water loop flows through the plate heat exchanger 1, carrying away the refrigerant heat from the compressor 2 exhaust port. The refrigerant loop reduces the return air temperature as follows: after flowing through the compressor 2, the refrigerant enters the plate heat exchanger 1, is condensed and its temperature decreases, and then flows into the refrigerant coil 3 after being throttled and depressurized by the electronic expansion valve 6.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A parallel system for a water-cooled dual-source air wall, characterized in that: The system includes a plate heat exchanger (1), two compressors (2), a refrigerant coil (3), a chilled water coil (4), and an EC fan (5). The plate heat exchanger (1) and the chilled water coil (4) are provided with a chilled water inlet and a chilled water outlet. The chilled water inlet and outlet are connected in parallel to the chilled water inlet and outlet pipes, respectively, to form a chilled water loop. The plate heat exchanger (1) and the refrigerant coil (3) are each provided with two refrigerant inlet and two refrigerant outlets. The plate heat exchanger (1) and the refrigerant coil (3) are connected to each other through the refrigerant inlet pipe and the refrigerant outlet pipe, respectively, to form a refrigerant loop. The two compressors (2) are respectively installed on the two refrigerant outlet pipes. The EC fan (5) is directed towards the chilled water coil (4).

2. The parallel system of the water-cooled dual-source air wall according to claim 1, characterized in that: The chilled water coil (4) is arranged after the EC fan (5), and the refrigerant coil (3) is arranged after the chilled water coil (4).

3. The parallel system of the water-cooled dual-source air wall according to claim 1, characterized in that: An electronic expansion valve (6) is installed on the refrigerant input pipeline.

4. The parallel system of the water-cooled dual-source air wall according to claim 1, characterized in that: A chilled water valve (7) is installed on the chilled water output pipe of the chilled water coil (4).

5. The parallel system of the water-cooled dual-source air wall according to claim 1, characterized in that: The plate heat exchanger (1) is equipped with a plate water valve (8) on the chilled water output pipe.

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