Cooling water temperature compensation system

Abstract

The present application belongs to the technical field of cooling equipment, and particularly relates to a cooling water temperature compensation system. The outlet water of a machine room load is heat-exchanged with the outlet water of a cooling tower at a heat exchanger 1 and with the outlet water of a refrigerator at a heat exchanger 2. The cooling tower, the refrigerator and the heat exchanger 1 are arranged in series on the same loop and the on-off of the cooling tower and the heat exchanger 1 is controlled by a valve. The present application connects the refrigerator in series into the cooling loop with the cooling tower as the cold source, and can rapidly increase the temperature of the cooling water by heat-exchanging with the outlet water of the machine room load when the temperature of the cooling water is lower than the starting temperature of the refrigerator, so as to rapidly start the refrigeration program of the refrigerator.

Description

Technical Field

[0001] The invention belongs to the technical field of cooling equipment, and in particular relates to a cooling water temperature compensation system. Background Art

[0002] Computers in data centers generate a significant amount of heat when operating. To maintain proper operation, cooling equipment is required. These cooling systems typically use chillers and cooling towers as cooling sources. In low temperatures, cooling towers can effectively reduce energy consumption. In high temperatures, the water outlet temperature of cooling towers cannot meet heat dissipation requirements, so chillers are used to cool the computers.

[0003] When a cooling tower is currently used as a cold source, the water outlet temperature of the cooling tower is monitored. When the water outlet temperature of the cooling tower is higher than a certain set value, the cold source is switched to a freezer. However, when this cold source switching method is used, the outside temperature fluctuates multiple times within a day in spring and autumn, and the cold source switching condition is met multiple times. This makes the cold source switching too frequent, affecting the efficient and stable operation of the cooling equipment. A patent entitled "Cooling Water Temperature Compensation Control Method" filed on the same day uses the outdoor wet-bulb temperature as the cold source switching condition. When used, there is a situation where the measured outside temperature meets the cold source switching condition, but the water outlet temperature of the cooling tower is lower than the refrigeration start-up condition of the freezer. Because changing the refrigeration start-up condition of the freezer is difficult and expensive, it is necessary to wait until the water outlet temperature of the cooling tower rises to the refrigeration start-up set value of the freezer before switching the cold source. The cooling equipment cannot switch the cold source in time, which can cause overheating in the data center and reduce the operating efficiency of the computer.

[0004] Chinese patent CN101902897B discloses a cooling system for a communications room. A winter antifreeze electric heater is installed in the cooling tower to prevent freezing. This solution can heat the cooling water in the cooling tower so that the refrigerator can be started in time. However, the electric heating device has safety hazards. If the electric heating device ages and leaks electricity, it may cause the cooling system to fail, endangering the personal safety of inspection personnel. When in use, the waste heat of the electric heating device will also reduce the operating efficiency of the cooling system. Summary of the Invention

[0005] The object of the present invention is to provide a cooling water temperature compensation system capable of quickly starting a refrigerator.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a cooling water temperature compensation system, in which the outlet water of the machine room load exchanges heat with the outlet water of the cooling tower at heat exchanger 1 and with the outlet water of the freezer at heat exchanger 2. The cooling tower, freezer and heat exchanger 1 are arranged in series on the same circuit, and the connection and disconnection of the cooling tower and heat exchanger 1 are controlled by a valve.

[0007] Compared with the prior art, the application has the following technical effects: connecting the refrigerating machine in series into the cooling circuit with the refrigerating tower as the cold source, which can rapidly raise the cooling water temperature by heat exchange with the outlet water of the machine room load when the cooling water temperature is lower than the refrigerating machine refrigeration starting temperature, thereby rapidly starting the refrigeration program of the refrigerating machine. BRIEF DESCRIPTION OF DRAWINGS

[0008] The following is a brief description of the content expressed by each drawing of the present specification and the labels in the drawings:

[0009] Figure 1 is a schematic diagram of the present application;

[0010] Figure 2 is a schematic diagram of the working or compensation state of the present refrigerating water tower;

[0011] Figure 3 is a schematic diagram of the working state of the refrigerating machine refrigeration and the refrigerating water tower auxiliary heat dissipation;

[0012] Figure 4 is a schematic diagram of the working state of the present single refrigerating machine refrigeration;

[0013] Figure 5 , 6 is a schematic diagram of the control method of the present application.

[0014] In the drawings: 10. Machine room load, 20. Cooling tower, 30. Refrigerating machine, 40. Heat exchanger one, 50. Heat exchanger two, C1. Valve one, C2. Valve two, R1. Valve four, R2. Valve five. DETAILED DESCRIPTION

[0015] The specific embodiments of the present application will be further described in detail below by combining the drawings and the description of the embodiments.

[0016] The pipeline of the present embodiment is shown in the attached Figure 1 The outlet water of the machine room load 10 is heat exchanged with the outlet water of the cooling tower 20 at the heat exchanger one 40 and heat exchanged with the outlet water of the refrigerating machine 30 at the heat exchanger two 50. The cooling tower 20 and the refrigerating machine 30, the heat exchanger one 40 are arranged in series on the same circuit and the on-off of the cooling tower 20 and the heat exchanger one 40 is controlled by the valve. The machine room load 10, the heat exchanger one 40 and the heat exchanger two 50 are arranged in series on the same circuit and the on-off of the machine room load 10 and the heat exchanger one 40 is controlled by the valve.

[0017] The specific piping arrangement is as follows: the water outlet of cooling tower 20 is sequentially equipped with valve 1 C1 and valve 2 C2. Valve 1 C1 is connected between the water outlet of cooling tower 20 and the inlet of heat exchanger 1 40, valve 2 C2 is connected between the outlet of heat exchanger 1 40 and the return water inlet of cooling tower 20, and a straight-through pipe 1 C3 is provided between valve 1 C1 and valve 2 C2. The water outlet of computer room load 10 is sequentially equipped with valve 4 R1 and valve 5 R2. Valve 4 R1 is connected between the water outlet of computer room load 10 and the inlet of heat exchanger 1 40, valve 5 R2 is connected between the outlet of heat exchanger 1 40 and the return water inlet of computer room load 10, and a straight-through pipe 2 R3 is provided between valve 4 R1 and valve 5 R2. In this way, if and only if valves 1 and 2 (C1 and C2) disconnect straight-through pipe 1 (C3) and connect cooling tower 20 with heat exchanger 1 (40), and valves 4 and 5 (R1 and R2) disconnect straight-through pipe 2 (R3) and connect machine room load 10 with heat exchanger 1 (40), the outlet water from cooling tower 20 will exchange heat with the outlet water from machine room load 10 at heat exchanger 1 (40). After chiller 30 has cooled, the valves are controlled to connect valves 1 and 2 (C1 and C2) to straight-through pipe 1 (C3), or valves 4 and 5 (R1 and R2) to straight-through pipe 2 (R3), and the outlet water from machine room load 10 will exchange heat with the outlet water from chiller 30 at heat exchanger 2 (50).

[0018] In the embodiment shown in the drawings, the refrigerator 30 is located upstream of the heat exchanger 40. In this way, the refrigerator 30 will not start until the cooling water in the circuit has been heated to the set temperature, thereby ensuring the stable operation of the refrigerator 30. In order to facilitate the switching of the cold source in spring and autumn, when the cooling tower 20 is used as the cold source, the following method can be used. Figure 2 The operating mode shown. The cooling water temperature at the outlet of heat exchanger 1 40 in the cooling water circuit is relatively high. If the chiller 30 is located downstream of heat exchanger 1 40 and upstream of the return water end of the cooling tower 20, the chiller 30 cooling process can be started more quickly. However, since there is still cooling water with a temperature lower than the set temperature in the circuit, if the cooling water temperature flowing through the chiller 30 is lower than the set temperature after the chiller 30 cooling process is started, the chiller 30 may stop cooling, affecting the stability of the chiller 30 operation.

[0019] When the cold source is switched from the cooling tower 20 to the refrigerator, the outlet water temperature of the cooling tower 20 is higher than the outlet water temperature of the refrigerator 30. In the embodiment shown in the drawings, the heat exchanger 2 50 is located downstream of the heat exchanger 1 40. Figure 2 In the operating mode shown, before the refrigerator 30 is turned on and operates stably, the water outlet of the computer room load 10 is first cooled at the heat exchanger 1 40 and then further heated at the heat exchanger 2 50, which can ensure the heat dissipation effect and thus ensure the reliability of the computer operation during the cold source switching process. Figure 2In the operating mode shown, after the chiller 30 is turned on, the outlet water of the computer room load 10 is first heat exchanged at the heat exchanger 2 50. If the temperature of the computer room load water after heat exchange is lower than the outlet water of the cooling tower 20, the temperature of the computer room load water at the heat exchanger 1 40 will increase, thereby affecting the heat dissipation effect of the computer room load 10.

[0020] An example of how to use the cooling water temperature compensation system is as follows:

[0021] As attached Figure 5 、 6 As shown, the horizontal axis t is time, and the vertical axis T is the outdoor wet-bulb temperature. When the outdoor wet-bulb temperature is lower than T0, the cooling tower 20 is used as a cold source to dissipate heat for the machine room load 10. When the outdoor wet-bulb temperature is higher than T0, the freezer 30 is used as a cold source to dissipate heat for the machine room load 10.

[0022] When the outdoor wet bulb temperature is higher than T0, if the outlet water temperature of the cooling tower 20 is lower than the refrigeration start-up temperature of the refrigerator 30, the cooling water circuit adopts the following Figure 2 In the operating mode shown, valve 1 C1 connects the outlet of the cooling tower 20 with the inlet of the heat exchanger 1 40, and valve 2 C2 connects the outlet of the heat exchanger 1 40 with the return water port of the cooling tower 20. At the same time, valve 4 R1 in the machine room circuit connects the outlet of the machine room load 10 with the inlet of the heat exchanger 1 40, and valve 5 R2 connects the outlet of the heat exchanger 1 40 with the return water port of the machine room load 10. In this way, the outlet water of the cooling tower 20 can be quickly heated after heat exchange with the machine room load water in the heat exchanger 1 40, thereby quickly starting the chiller 30 connected in series on the same circuit.

[0023] In fact, in spring and autumn, when the cooling equipment uses the cooling tower 20 as the cold source, the following method can be used: Figure 2 In the working mode shown, when the outdoor wet-bulb temperature is higher than T0, the water temperature of the cooling water in the cooling circuit must be higher than the refrigeration starting temperature of the freezer 30, and the refrigeration program of the freezer 30 can be started without switching the working mode.

[0024] After the chiller 30 starts refrigeration and stabilizes, the valve four and five R1, R2 are controlled to connect the straight-through pipeline two R3, and the communication pipeline between the chiller room load loop and the heat exchanger one 40 is disconnected, that is, the valve four R1 connects the water outlet of the chiller room load 10 and the valve five R2, and the valve five R2 connects the valve four R1 and the inlet of the heat exchanger two 50; then the valve one and two C1, C2 are controlled to connect the straight-through pipeline one C3, and the communication pipeline between the cooling loop and the heat exchanger one 40 is disconnected, that is, the valve one C1 connects the water outlet of the cooling tower 20 and the valve two C2, and the valve two C2 connects the valve one C1 and the backwater outlet of the cooling tower 20, so that the cooling tower 20 can be used to dissipate heat for the chiller 30 to further reduce energy consumption. In specific implementation, T2 is the auxiliary heat dissipation working temperature of the cooling tower 20, and T2 is greater than the refrigeration starting temperature of the chiller; the outlet water temperature of the cooling tower 20 is judged, and when the outlet water temperature of the cooling tower 20 is less than or equal to T2, the operation mode as shown in the attached Figure 3 is applied, the cooling tower 20 and the chiller 30 are connected in series in the cooling water loop, and the cooling tower 20 dissipates heat for the chiller 30; when the outlet water temperature of the cooling tower 20 is greater than T2, the operation mode as shown in the attached Figure 4 is applied, and the cooling tower 20 stops working, and the chiller 30 adopts other heat dissipation modes.

[0025] In other embodiments, after the chiller 30 starts refrigeration and stabilizes, the operation mode as shown in the attached Figure 4 is directly applied.

[0026] In actual application, in order to ensure the cooling effect of the data center during maintenance and repair of the cooling equipment, the cooling equipment usually has two or more cooling tower groups and chiller groups, the cooling towers in the cooling tower group are arranged in parallel, and the chillers in the chiller group are arranged in parallel. In the embodiment shown in the attached drawings, the cooling tower 20 and the chiller 30 connected in series in the same loop are the currently working cooling tower 20 and chiller 30, and the standby cooling tower 20 and chiller 30 can still be repaired by the staff.

Claims

1. A cooling water temperature compensation system, wherein the outlet water of the machine room load (10) exchanges heat with the outlet water of the cooling tower (20) at the first heat exchanger (40) and exchanges heat with the outlet water of the refrigerator (30) at the second heat exchanger (50), characterized in that: The cooling tower (20), the refrigerator (30), and the heat exchanger (40) are arranged in series on the same circuit, and the cooling tower (20) and the heat exchanger (40) are controlled by a valve to be on and off; The refrigerator (30) is located upstream of the heat exchanger (40); Heat exchanger 2 (50) is located downstream of heat exchanger 1 (40); The water outlet of the cooling tower (20) is provided with valve 1 (C1) and valve 2 (C2) in sequence. Valve 1 (C1) is connected between the water outlet of the cooling tower (20) and the inlet of heat exchanger 1 (40). Valve 2 (C2) is connected between the outlet of heat exchanger 1 (40) and the return water outlet of the cooling tower (20). A straight-through pipeline 1 (C3) is provided between valve 1 (C1) and valve 2 (C2). The water outlet of the machine room load (10) is provided with valve 4 (R1) and valve 5 (R2) in sequence. Valve 4 (R1) is connected between the water outlet of the machine room load (10) and the inlet of heat exchanger 1 (40). Valve 5 (R2) is connected between the outlet of heat exchanger 1 (40) and the return water outlet of the machine room load (10). A straight-through pipe 2 (R3) is provided between valve 4 (R1) and valve 5 (R2). When valves one and two (C1, C2) disconnect the straight-through pipe one (C3) and connect the cooling tower (20) and the heat exchanger one (40), and valves four and five (R1, R2) disconnect the straight-through pipe two (R3) and connect the machine room load (10) and the heat exchanger one (40), the outlet water of the cooling tower (20) exchanges heat with the outlet water of the machine room load (10) at the heat exchanger one (40); when valves one and two (C1, C2) connect the straight-through pipe one (C3) or valves four and five (R1, R2) connect the straight-through pipe two (R3), the outlet water of the freezer (30) exchanges heat with the outlet water of the machine room load (10) at the heat exchanger two (50).

2. The cooling water temperature compensation system according to claim 1, characterized in that: The machine room load (10), heat exchanger 1 (40), and heat exchanger 2 (50) are arranged in series on the same circuit, and the on / off of the machine room load (10) and heat exchanger 1 (40) is controlled by a valve.

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