Water cooling system for air-cooled cold water air conditioning unit

Abstract

A water cooling system for an air-cooled cold water air conditioning unit comprises the air-cooled cold water air conditioning unit and end equipment which are communicated with the two ends of a chilled water supply pipe and a chilled water return pipe, and a water cooling heat exchanger is communicated with the chilled water return pipe through a water cooling heat exchanger water inlet pipe and a water cooling heat exchanger water outlet pipe; chilled water return pipe partition electric valves are arranged between nodes where the water-cooling heat exchanger water inlet pipe is communicated with the chilled water return pipe and nodes where the water-cooling heat exchanger water outlet pipe is communicated with the chilled water return pipe; the chilled water return pipe partition electric valve is electrically connected with the water cooling system control cabinet; when the temperature of river water is low in winter, the river water is used as a natural cold source to cool an electrical equipment room instead of an air conditioning unit, so that the purposes of reducing the loss of parts of the air conditioning unit caused by low-temperature refrigeration in winter and saving energy are achieved; compared with a cooling system using winter environment cold air as a natural cold source in the prior art, the system is higher in heat exchange efficiency and better in cooling effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of air-conditioning units, and relates to a water-cooling system for an air-cooled chilled water air-conditioning unit. Background Art

[0002] In places where there are many and concentrated electrical equipment such as power plants, transmission and substation stations, and large data centers, due to the large amount of heat generated by the electrical equipment, air-conditioning equipment is required to cool the electrical equipment room throughout the year. In some places, air-cooled chilled water air-conditioning units are used. The ideal ambient dry-bulb temperature for the refrigeration mode of this unit is 18 - 43 (°C). The ambient dry-bulb temperature in winter is below 10 °C, far lower than the ideal operating conditions of the refrigeration mode of the air-conditioning unit. Long-term refrigeration operation in a low-temperature environment causes great damage to the air-conditioning unit, seriously affecting the service life of the main components of the air-conditioning unit and also being unfavorable for the stable operation of the equipment. Moreover, the river water in winter is a natural cold source and can be utilized. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a water-cooling system for an air-cooled chilled water air-conditioning unit. When the ambient temperature is relatively low in winter, it replaces the air-conditioning unit and uses the ambient cold air as a natural cold source to cool the electrical equipment room, so as to achieve the purpose of reducing the loss of the components of the air-conditioning unit caused by low-temperature refrigeration in winter and saving energy.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is: A water-cooling system for an air-cooled chilled water air-conditioning unit, which includes an air-cooled chilled water air-conditioning unit and terminal equipment with both ends of the chilled water supply pipe and the chilled water return pipe connected. The water-cooled heat exchanger is connected to the chilled water return pipe through the water-cooled heat exchanger inlet pipe and the water-cooled heat exchanger outlet pipe; a chilled water return pipe isolation electric valve is arranged between the nodes where the water-cooled heat exchanger inlet pipe is connected to the chilled water return pipe and where the water-cooled heat exchanger outlet pipe is connected to the chilled water return pipe; the chilled water return pipe isolation electric valve is electrically connected to the water-cooling system control cabinet.

[0005] The water-cooling system control cabinet is electrically connected to the air-cooled chilled water air-conditioning unit, the water-cooled heat exchanger inlet pipe electric valve, and the water-cooled heat exchanger outlet pipe electric valve; the water-cooled heat exchanger inlet pipe electric valve and the water-cooled heat exchanger outlet pipe electric valve are respectively arranged on the water-cooled heat exchanger inlet pipe and the water-cooled heat exchanger outlet pipe.

[0006] A water-cooled heat exchanger outlet water temperature sensor is arranged on the water-cooled heat exchanger outlet pipe and is electrically connected to the water-cooling system control cabinet.

[0007] The cooling water inlet pipe of the water-cooled heat exchanger is connected to the drainage ditch; the cooling water outlet pipe of the water-cooled heat exchanger is connected to the cooling water source.

[0008] A water source water temperature sensor is arranged at the water intake of the cooling water source and is electrically connected to the water-cooling system control cabinet.

[0009] A cooling water pump and a water filter are provided on the cooling water inlet pipe, and the cooling water pump is electrically connected to the water-cooling system control cabinet.

[0010] The chilled water circulation pump provided on the chilled water return pipe is on the side close to the air-cooled chiller unit.

[0011] The main beneficial effects of the present utility model are as follows:

[0012] Equipment such as a plate heat exchanger, a water pump, a filter, and a control cabinet are installed on the chilled water return pipeline of the air-cooled chiller unit. In winter, when the water temperature of the river water is lower than 10°C, the air-cooled chiller unit is replaced, and the river water is used as a natural cold source to cool the electrical equipment room, so as to reduce the loss of the components of the air-conditioning main unit caused by low-temperature refrigeration in winter and achieve the purpose of energy conservation.

[0013] The natural cold source adopted is river water, with high heat exchange efficiency and good cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] In the figure: 1. Water-cooled heat exchanger; 2. Cooling water pump; 3. Water filter; 4. Water intake; 5. Cooling water source; 6. Cooling water inlet pipe; 7. Cooling water outlet pipe; 8. Water-cooled heat exchanger inlet pipe; 9. Water-cooled heat exchanger outlet pipe; 10. Electric valve for water-cooled heat exchanger inlet pipe; 11. Electric valve for water-cooled heat exchanger outlet pipe; 12. Electric valve for isolating the chilled water return pipe; 13. Water-cooling system control cabinet; 14. Water temperature sensor for the outlet water of the water-cooled heat exchanger; 15. Water temperature sensor for the water source; 16. Drainage ditch; 17. Air-cooled chiller unit; 18. Chilled water circulation pump; 19. Chilled water supply pipe; 20. Terminal equipment; 21. Chilled water return pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] As Figure 1 shown in, a water-cooling system for an air-cooled chiller unit includes an air-cooled chiller unit 17 and terminal equipment 20 with both ends of a chilled water supply pipe 19 and a chilled water return pipe 21 connected. The water-cooled heat exchanger 1 is connected to the chilled water return pipe 21 through a water-cooled heat exchanger inlet pipe 8 and a water-cooled heat exchanger outlet pipe 9; a chilled water return pipe isolating electric valve 12 is provided between the nodes where the water-cooled heat exchanger inlet pipe 8 is connected to the chilled water return pipe 21 and where the water-cooled heat exchanger outlet pipe 9 is connected to the chilled water return pipe 21; the chilled water return pipe isolating electric valve 12 is electrically connected to the water-cooling system control cabinet 13.

[0018] In a preferred embodiment, the water-cooling system control cabinet 13 is electrically connected to the air-cooled chilled water air conditioner unit 17, the electric valve 10 on the water inlet pipe of the water-cooled heat exchanger, and the electric valve 11 on the water outlet pipe of the water-cooled heat exchanger; the electric valve 10 on the water inlet pipe of the water-cooled heat exchanger and the electric valve 11 on the water outlet pipe of the water-cooled heat exchanger are respectively arranged on the water inlet pipe 8 and the water outlet pipe 9 of the water-cooled heat exchanger.

[0019] In a preferred embodiment, a water temperature sensor 14 for the water outlet of the water-cooled heat exchanger is arranged on the water outlet pipe 9 of the water-cooled heat exchanger and is electrically connected to the water-cooling system control cabinet 13.

[0020] In a preferred embodiment, the cooling water inlet pipe 6 of the water-cooled heat exchanger 1 is communicated with the drainage ditch 16; the cooling water outlet pipe 7 of the water-cooled heat exchanger 1 is communicated with the cooling water source 5.

[0021] In a preferred embodiment, a water temperature sensor 15 for the water intake is arranged at the water intake 4 of the cooling water source 5 and is electrically connected to the water-cooling system control cabinet 13.

[0022] In a preferred embodiment, a cooling water pump 2 and a water filter 3 are arranged on the cooling water inlet pipe 6, and the cooling water pump 2 is electrically connected to the water-cooling system control cabinet 13.

[0023] In a preferred embodiment, the chilled water circulation pump 18 arranged on the chilled water return pipe 21 is on the side close to the air-cooled chilled water air conditioner unit 17.

[0024] Example 1

[0025] When the water temperature sensor 15 for the water source detects that the water temperature of the water source is higher than the set value, the cooling water pump 2 stops running, the electric valve 10 on the water inlet pipe of the water-cooled heat exchanger closes, the electric valve 11 on the water outlet pipe of the water-cooled heat exchanger closes, the isolation electric valve 12 on the chilled water return pipe opens, the air-cooled chilled water air conditioner unit 17 starts, and the chilled water circulation pump 18 starts. This system does not participate in the refrigeration cycle of the original central air-conditioning system. Under the pressure of the chilled water circulation pump 18, the low-temperature chilled water is transported from the air-cooled chilled water air conditioner unit 17 to the terminal equipment 20 in the electrical equipment room through the chilled water supply pipe 19, exchanges heat with the hot air in the electrical equipment room in the terminal equipment 20 to lower the temperature, and the chilled water after heat exchange then flows back to the air-cooled chilled water air conditioner unit 17 through the chilled water return pipe 21.

[0026] Example 2

[0027] When the water source water temperature sensor 15 detects that the water temperature of the water source is lower than the set value, the air-cooled chiller unit 17 stops operating, the chilled water circulation pump 18 keeps running, the cooling water pump 2 starts operating, the electric valve 10 of the water inlet pipe of the water-cooled heat exchanger opens, the electric valve 11 of the water outlet pipe of the water-cooled heat exchanger opens, and the isolating electric valve 12 of the chilled water return pipe closes. The chilled water flows from the terminal device 20 through the chilled water return pipe 21 into the water inlet pipe 8 of the water-cooled heat exchanger, and through the electric valve 10 of the water inlet pipe of the water-cooled heat exchanger into the water-cooled heat exchanger 1, where it exchanges heat with the low-temperature river water flowing into the water-cooled heat exchanger 1 from the water intake 4 through the cooling water inlet pipe 6, the water filter 3, and the cooling water pump 2. After the heat exchange, the low-temperature chilled water flows through the electric valve 11 of the water outlet pipe of the water-cooled heat exchanger and the water outlet pipe 9 of the water-cooled heat exchanger into the chilled water return pipe 21, then flows through the chilled water circulation pump 18 and back into the air-cooled chiller unit 17, and finally is conveyed to the terminal device 20 in the electrical equipment room through the chilled water supply pipe 19, where it exchanges heat with the hot air in the electrical equipment room to lower the temperature. The river water that has completed the heat exchange in the water-cooled heat exchanger 1 is directly discharged into the drainage ditch 16 through the cooling water outlet pipe 7.

[0028] Preferably, the water-cooled heat exchanger 1 includes, but is not limited to, various forms of water-cooled heat exchangers such as shell-and-tube water-cooled heat exchangers and plate water-cooled heat exchangers.

[0029] Preferably, a PLC controller is installed in the water-cooling system control cabinet 13. The cooling water pump 2, the electric valve 10 of the water inlet pipe of the water-cooled heat exchanger, the electric valve 11 of the water outlet pipe of the water-cooled heat exchanger, the isolating electric valve 12 of the chilled water return pipe, the water temperature sensor 14 of the water outlet of the water-cooled heat exchanger, the water source water temperature sensor 15, and the air-cooled chiller unit 17 are connected to the PLC controller in the water-cooling system control cabinet 13 by linkage control lines. The water-cooling system control cabinet 13 automatically controls the operating states of each controlled device through the PLC controller.

[0030] Preferably, the cooling water pump 2 is a variable-frequency water pump. The water-cooling system control cabinet 13 can automatically adjust the operating frequency of the cooling water pump according to the water temperature data fed back by the water temperature sensor 14 of the water outlet of the water-cooled heat exchanger, so that the water temperature of the water outlet of the water-cooled heat exchanger is stabilized within the range around the target temperature value.

[0031] Preferably, the cooling water source 5 is river water. When there is no river water near the application scenario of the scheme, or the river water is far away and the construction cost is high, tap water near the application scenario can be used as the cooling water source. When the cooling water source is tap water, the water filter 3 does not need to be installed.

[0032] The above embodiments are only the preferred technical solutions of the present utility model and should not be regarded as a limitation to the present utility model. In the present application, the embodiments and the features in the embodiments can be arbitrarily combined with each other without conflict. The protection scope of the present utility model shall be the technical solutions recited in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recited in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present utility model.

Claims

1. A water-cooling system for an air-cooled chiller unit, characterized in that: It includes an air-cooled chiller unit and terminal equipment with both ends of the chilled water supply pipe and the chilled water return pipe connected. The water-cooled heat exchanger is connected to the chilled water return pipe through the water-cooled heat exchanger inlet pipe and the water-cooled heat exchanger outlet pipe; a chilled water return pipe isolation electric valve is arranged between the nodes where the water-cooled heat exchanger inlet pipe is connected to the chilled water return pipe and where the water-cooled heat exchanger outlet pipe is connected to the chilled water return pipe; the chilled water return pipe isolation electric valve is electrically connected to the water-cooled system control cabinet.

2. The water cooling system for an air-cooled chiller unit according to claim 1, wherein: The water-cooled system control cabinet is electrically connected to the air-cooled chiller unit, the water-cooled heat exchanger inlet pipe electric valve, and the water-cooled heat exchanger outlet pipe electric valve; the water-cooled heat exchanger inlet pipe electric valve and the water-cooled heat exchanger outlet pipe electric valve are respectively arranged on the water-cooled heat exchanger inlet pipe and the water-cooled heat exchanger outlet pipe.

3. The water cooling system for an air-cooled chiller unit according to claim 1, characterized in that: A water-cooled heat exchanger outlet water temperature sensor is arranged on the water-cooled heat exchanger outlet pipe and is electrically connected to the water-cooled system control cabinet.

4. The water cooling system for an air-cooled chiller unit according to claim 1, characterized in that: The cooling water inlet pipe of the water-cooled heat exchanger is connected to the drainage ditch; the cooling water outlet pipe of the water-cooled heat exchanger is connected to the cooling water source.

5. The water cooling system for an air-cooled chiller unit according to claim 4, characterized in that: A water source water temperature sensor is arranged at the water intake of the cooling water source and is electrically connected to the water-cooled system control cabinet.

6. The water cooling system for an air-cooled chiller unit according to claim 4, characterized in that: A cooling water pump and a water filter are arranged on the cooling water inlet pipe, and the cooling water pump is electrically connected to the water-cooled system control cabinet.

7. The water cooling system for an air-cooled chiller unit according to claim 1, characterized in that: The chilled water circulation pump arranged on the chilled water return pipe is on the side close to the air-cooled chiller unit.

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