Parallel system of water-cooling double-cold-source ventilation wall and refrigeration method

Abstract

The invention discloses a parallel system of a water-cooling double-cold-source air wall and a refrigeration method. The parallel system comprises a plate heat exchanger, two compressors, a fluorine coil pipe, a chilled water coil pipe and an EC fan. The plate heat exchanger and the chilled water coil pipe are provided with a chilled water input end and a chilled water output end, and the chilled water input end and the chilled water output end are correspondingly connected to a chilled water inlet pipeline and a chilled water outlet pipeline in parallel to form a chilled water loop. The plate heat exchanger and the chilled water coil pipe are connected in parallel, chilled water can completely enter the chilled water coil pipe, and natural cold source refrigeration is achieved; chilled water can also be divided into two paths, one part enters the chilled water coil, the other part enters the plate heat exchanger to take away heat of the high-temperature and high-pressure refrigerant, and mixed refrigeration is achieved; all chilled water enters the plate heat exchanger to realize mechanical refrigeration; a natural cold source can be fully utilized for refrigeration, a fluorine pump is simplified, the energy efficiency of the unit is improved, and the energy-saving requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation in data centers, and in particular to a parallel system of water-cooled dual-cold-source air walls and a refrigeration method. Background Art

[0002] The rapid development of the internet is driving growing heat dissipation demands and increasing heat dissipation density in data centers, increasing the need for energy-efficient cooling equipment. Air conditioning compressors consume the most energy of all components. Therefore, during cold weather, especially in northern my country during autumn and winter, natural cooling can be fully utilized to achieve energy savings.

[0003] Although fluorine pump products can use natural cooling sources to a certain extent, that is, using low-temperature air to condense the refrigerant, in natural cooling mode, due to the lack of compressor power, the refrigerant cannot be circulated through suction and exhaust. The fluorine pump needs to be used to provide power, which increases the energy consumption of the unit to a certain extent. Summary of the Invention

[0004] The object of the present invention is to provide a parallel system of water-cooled dual-cold-source air walls and a refrigeration method to solve the technical problems raised in the background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides a parallel system of a water-cooled dual-cold-source air wall, comprising a plate heat exchanger, two compressors, a fluorine coil, a chilled water coil, and an EC fan; the plate heat exchanger and the chilled water coil are provided with a chilled water input end and a chilled water output end, and are respectively connected in parallel to the chilled water inlet and outlet pipes through the chilled water input end and the chilled water output end to form a chilled water loop; the plate heat exchanger and the fluorine coil are both provided with two refrigerant input ends and a refrigerant output end, and the plate heat exchanger and the fluorine coil are correspondingly connected through the refrigerant input pipe and the refrigerant output pipe to form a refrigerant loop, the two compressors are respectively arranged on the two refrigerant output pipes, and the wind direction of the EC fan is directly facing the chilled water coil.

[0006] Furthermore, the chilled water coil is arranged after the EC fan, and the fluorine coil is arranged after the chilled water coil.

[0007] Furthermore, an electronic expansion valve is provided on the refrigerant input pipeline.

[0008] Furthermore, a chilled water valve is provided on the chilled water output end pipe of the chilled water coil.

[0009] Furthermore, a plate water exchange valve is provided on the chilled water output pipe of the plate heat exchanger.

[0010] The present invention also provides a refrigeration method for a parallel system of water-cooled dual-cold-source air walls, comprising the following steps: S1. Obtain the ambient temperature, and set temperature thresholds A°C and B°C for the natural cooling mode, the mixed cooling mode, and the mechanical cooling mode according to the ambient temperature. Determine the cooling mode according to the ambient temperature and the temperature thresholds. The cooling mode is determined specifically as follows: Natural cooling source mode: ambient temperature ≤ A℃; Mixed cooling mode: A℃≤ambient temperature≤B℃; Mechanical cooling mode: B℃≤ambient temperature; S2. Control the parallel system to operate according to the determined cooling mode.

[0011] Furthermore, the step S2 controls the operation of the parallel system as follows: When the ambient temperature is lower than the set value A℃, the system enters the natural cooling source mode, controls the two compressors (2), the plate heat exchanger (1), and the electronic expansion valve (6) to stop working, and closes the plate water exchange valve (8). At this time, the chilled water enters the chilled water coil (4) from the chilled water inlet pipe and exchanges heat with the return air of the EC fan (5). The chilled water temperature rises and flows out through the chilled water valve (7), flows through the chilled water coil (4), and takes away the heat of the return air. When the ambient temperature is between A℃ and B℃, the system enters the mixed mode. The chilled water valve (7) and the plate water exchange valve (8) are controlled to open at the same time, the chilled water coil (4) and the fluorine coil (3) work at the same time, and the return air of the EC fan (5) is first cooled by passing through the chilled water coil (4); and is cooled again by passing through the fluorine coil (3); when the ambient temperature is higher than B℃, the mechanical refrigeration mode is entered, the chilled water valve (7) is controlled not to open, and the chilled water loop flows through the plate heat exchanger (1), taking away the refrigerant heat from the exhaust port of the compressor (2), and reducing the return air temperature through the refrigerant loop.

[0012] Furthermore, the working priority of the chilled water coil and the fluorine coil is that the chilled water coil takes priority. When the cooling demand cannot be met, the compressor is turned on and mechanical refrigeration is used to supplement it.

[0013] Furthermore, in the mechanical refrigeration mode, the return air temperature is lowered through the refrigerant loop as follows: the refrigerant flows through the compressor and enters the plate heat exchanger, where it is condensed and its temperature is lowered. It then flows into the fluorine coil after being throttled and reduced in pressure by the electronic expansion valve. Beneficial effects

[0014] The present invention connects the plate heat exchanger and the chilled water coil in parallel, so that all the chilled water can enter the chilled water coil to realize natural cold source cooling; the chilled water can also be divided into two paths, part of which enters the chilled water coil, and part of which enters the plate heat exchanger to take away the heat of the high-temperature and high-pressure refrigerant to realize mixed cooling; all the chilled water enters the plate heat exchanger to realize mechanical cooling, and the chilled water pipeline always plays a role and will not be idle; the chilled water wind wall system and the direct expansion refrigeration and air-conditioning system are coupled to realize three cooling modes: natural cold source mode, mixed mode and mechanical cooling mode, which can make full use of natural cold source cooling, simplify fluorine pumps, improve the energy efficiency of the unit, and meet energy-saving needs.

[0015] The present invention sets two compressors and arranges the fluorine coils in a cross-arranged or up-down manner to ensure that the refrigerants in the two compressors will not mix; at the same time, when the return air enters the fluorine coils, it can still fully face the wind, avoiding large wind resistance and high energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions implemented in the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic diagram of the parallel system of the water-cooled dual-cooling source air wall of the present invention; Figure 2 This is a principle diagram of the natural cooling source mode of the present invention; Figure 3 This is a schematic diagram of the hybrid mode of the present invention; Figure 4 This is a schematic diagram of the mechanical refrigeration mode of the present invention; In the picture: 1. Plate heat exchanger; 2. Compressor; 3. Fluorine coil; 4. Chilled water coil; 5. EC fan; 6. Electronic expansion valve; 7. Chilled water valve; 8. Plate water exchange valve. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figures 1-4As shown, the present invention provides a parallel system of a water-cooled dual-cold source wind wall, including a plate heat exchanger 1, two compressors 2, a fluorine 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 input end and a chilled water output end, and the chilled water input end and the chilled water output end are respectively connected in parallel to the chilled water inlet and outlet pipes to form 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; the chilled water can also be divided into two paths, part of which enters the chilled water coil 4, and part enters the plate heat exchanger 1 to take away the heat of the high-temperature and high-pressure refrigerant to achieve mixed cooling; all the chilled water enters the plate heat exchanger 1 to achieve mechanical refrigeration, and the chilled water pipeline always plays a role and will not be idle.

[0020] The plate heat exchanger 1 and the fluorine coil 3 are both provided with two refrigerant input ends and refrigerant output ends. The plate heat exchanger 1 and the fluorine coil 3 are connected through the refrigerant input pipe and the refrigerant output pipe to form a refrigerant loop. The two compressors 2 are respectively arranged on the two refrigerant output pipes. The wind direction of the EC fan 5 is facing the chilled water coil 4. The chilled water coil 4 is arranged after the EC fan 5, and the fluorine coil 3 is arranged after the chilled water coil 4. The chilled water coil 4 and the fluorine coil 3 are arranged front and back. The return air of the EC fan 5 must first pass through the chilled water coil 4 and then reach the fluorine coil 3. The chilled water coil 4 can be used for pre-cooling and then pass through the fluorine coil 3 to achieve mixed cooling, which truly realizes the full use of the natural cold source. At this time, the chilled water coil 4 is mainly working and providing cooling capacity. When the ambient temperature rises and the chilled water coil 4 cannot meet the cooling demand, the compressor 2 is turned on and the fluorine coil 3 can be fully used for cooling and providing cooling. The chilled water enters the plate heat exchanger 1 and exchanges heat with the high-temperature and high-pressure refrigerant gas coming out of the exhaust port of the compressor 2, acting as cooling water. By setting up two compressors 2, the fluorine coil 3 is arranged crosswise or up and down to ensure that the refrigerants in the two compressors 2 will not mix; at the same time, when the return air enters the fluorine coil 3, it can still fully face the wind, avoiding large wind resistance and high energy consumption.

[0021] The present invention couples the chilled water-wind wall system with the direct expansion refrigeration and air-conditioning system. It has three refrigeration modes: natural cold source mode, mixed mode, and mechanical refrigeration mode. It can make full use of natural cold source refrigeration, simplify fluorine pumps, improve the energy efficiency of the unit (CLF and COP), and meet energy-saving needs.

[0022] An electronic expansion valve 6 is provided on the refrigerant input pipe, a chilled water valve 7 is provided on the chilled water output pipe of the chilled water coil 4, and a plate water exchange valve 8 is provided on the chilled water output pipe of the plate heat exchanger 1.

[0023] The present invention also provides a cooling method for a parallel system of a water-cooled dual-cold source air wall, which can realize three cooling modes according to the ambient temperature: natural cold source mode, mixed mode and mechanical refrigeration mode. When in use, the temperature thresholds A℃ and B℃ can be set according to the situation (for example, A is 15℃, B is 25℃). The temperature threshold settings are specifically: the ambient temperature of the natural cold source refrigeration mode ≤ A℃ ≤ the ambient temperature of the mixed refrigeration mode ≤ B℃ ≤ the ambient temperature of the mechanical refrigeration mode.

[0024] Natural cooling source mode: Figure 2 As shown in the figure, when the ambient temperature is lower than the set value A℃, the two compressors 2, the plate heat exchanger 1, and the electronic expansion valve 6 do not work, and the plate water exchange valve 8 is closed. At this time, the 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 chilled water temperature rises and flows out through the chilled water valve 7, flows through the chilled water coil 4, and takes away the heat of the return air.

[0025] Blend Mode: Figure 3 As shown in the figure, when the ambient temperature is between A°C and B°C, the chilled water valve 7 and the plate water exchange valve 8 are opened at the same time, the chilled water coil 4 and the fluorine coil 3 work at the same time, and the return air of the EC fan 5 is first cooled by the chilled water coil 4 and then cooled again by the fluorine coil 3. The working priority of the dual cold source coils of the chilled water coil 4 and the fluorine coil 3 is the chilled water coil 4. The natural cold source is used as much as possible to provide cooling to complete the cooling. If the cooling demand cannot be met, the compressor 2 is turned on and mechanical cooling is used to supplement it.

[0026] Mechanical cooling mode: Figure 4 As shown in the figure, 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, taking away the refrigerant heat from the exhaust port of the compressor 2. The working process of the refrigerant loop to reduce the return air temperature is as follows: the refrigerant flows through the compressor 2 and then enters the plate heat exchanger 1, where the temperature is lowered after being condensed, and then flows into the fluorine coil 3 after throttling and pressure reduction by the electronic expansion valve 6.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0028] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A parallel system of water-cooled dual-cooling source wind walls, characterized in that: The invention comprises a plate heat exchanger (1), two compressors (2), a fluorine 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 input end and a chilled water output end, and the chilled water input end and the chilled water output end are respectively connected in parallel to the chilled water inlet and outlet pipes to form a chilled water loop; the plate heat exchanger (1) and the fluorine coil (3) are both provided with two refrigerant input ends and refrigerant output ends, and the plate heat exchanger (1) and the fluorine coil (3) are respectively connected to each other through the refrigerant input pipe and the refrigerant output pipe to form a refrigerant loop, the two compressors (2) are respectively provided on the two refrigerant output pipes, and the wind direction of the EC fan (5) is directly facing the chilled water coil (4).

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

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

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

5. The parallel system of water-cooled dual-cooling source air walls according to claim 1 is characterized in that: A plate water exchange valve (8) is provided on the chilled water output pipe of the plate heat exchanger (1).

6. A cooling method for a parallel system of water-cooled dual-cooling source air walls, characterized in that: The parallel system according to any one of claims 1 to 5 comprises the following steps: S1. Obtain the ambient temperature, and set temperature thresholds A°C and B°C for the natural cooling mode, the mixed cooling mode, and the mechanical cooling mode according to the ambient temperature. Determine the cooling mode according to the ambient temperature and the temperature thresholds. The cooling mode is determined specifically as follows: Natural cooling source mode: ambient temperature ≤ A℃; Mixed cooling mode: A℃≤ambient temperature≤B℃; Mechanical cooling mode: B℃≤ambient temperature; S2. Control the parallel system to operate according to the determined cooling mode.

7. The refrigeration method according to claim 6, wherein: The step S2 of controlling the parallel system operation is specifically as follows: When the ambient temperature is lower than the set value A℃, the natural cooling source mode is entered, the two compressors (2), the plate heat exchanger (1), and the electronic expansion valve (6) are controlled to not work, and the plate water exchange valve (8) is closed. At this time, the chilled water enters the chilled water coil (4) from the chilled water inlet pipe and exchanges heat with the return air of the EC fan (5). The chilled water temperature rises and flows out through the chilled water valve (7), flows through the chilled water coil (4), and takes away the heat of the return air; When the ambient temperature is between A℃ and B℃, the system enters mixed mode, controls the chilled water valve (7) and the plate water exchange valve (8) to open simultaneously, and the chilled water coil (4) and the fluorine coil (3) work simultaneously. The return air from the EC fan (5) is first cooled by passing through the chilled water coil (4); and then cooled again by passing through the fluorine coil (3). When the ambient temperature is higher than B℃, the system enters the mechanical refrigeration mode, controls the chilled water valve (7) not to open, and the chilled water loop flows through the plate heat exchanger (1), taking away the refrigerant heat from the exhaust port of the compressor (2), and reducing the return air temperature through the refrigerant loop.

8. The refrigeration method according to claim 7, characterized in that: The working priority of the chilled water coil (4) and the fluorine coil (3) is that the chilled water coil (4) takes priority. When the cooling demand cannot be met, the compressor (2) is turned on and mechanical refrigeration is used to supplement it.

9. The refrigeration method according to claim 7, characterized in that: In the mechanical refrigeration mode, the return air temperature is reduced through the refrigerant loop as follows: the refrigerant flows through the compressor (2) and then enters the plate heat exchanger (1), where it is condensed and its temperature is reduced. The refrigerant then flows into the fluorine coil (3) after being throttled and reduced in pressure by the electronic expansion valve (6).

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