Cold water air conditioner and cooling water unit and cooling water control method thereof

A control method and cooling water technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as reduced lubricating oil return efficiency, reduced cooling effect, unit shutdown, etc., to prolong service life and avoid excessive Cooling and ensuring the effect of normal oil return

Inactive Publication Date: 2020-07-17
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when cooling in winter, due to the small cooling capacity of the air conditioner, the pressure difference between the condensing pressure and the evaporating pressure of the unit is prone to be too small, which leads to many reliability problems of the unit, such as: (1) causing lubricating oil The oil return efficiency of the oil is reduced, which in turn leads to the failure of the compressor to be well lubricated, resulting in a decrease in the performance of the compressor; (2) The slow flow of the refrigerant leads to a decrease in the cooling efficiency of the refrigerant, which causes the refrigerant to affect the frequency converter, lubricating oil, and motor in the unit. Reduced cooling effect, etc., resulting in performance degradation of functional devices and media due to excessive temperature, and may even cause unit shutdown due to over-temperature protection

Method used

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  • Cold water air conditioner and cooling water unit and cooling water control method thereof
  • Cold water air conditioner and cooling water unit and cooling water control method thereof
  • Cold water air conditioner and cooling water unit and cooling water control method thereof

Examples

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Embodiment 1

[0031] Please refer to figure 1 The cold water air conditioner of this embodiment includes a unit 1, a chilled water unit 2 and a cooling water unit 3 of this embodiment, and the unit unit 1 includes an evaporator (not shown in the figure) and a condenser (not shown in the figure).

[0032] The chilled water air conditioner of this embodiment is used for constant temperature cooling of the data room. The chilled water unit 2 includes a chilled water circuit 21 and a chilled water pump 22. The chilled water pump 22 drives the flow of chilled water in the chilled water circuit 21. The chilled water circuit 21 includes a first The heat exchange section 211 and the second heat exchange section (not shown in the figure), the first heat exchange section 211 exchanges heat with the evaporator, the second heat exchange section is arranged in the data room 4, the second heat exchange section and the data room The ambient air in 4 is heat exchanged, and the cooling capacity of the evapo...

Embodiment 2

[0054] Please refer to Figure 4 , this embodiment cancels the first valve 35a, the second valve 35b and the first water pump 34 in the first embodiment, and the second water pump 38 is set on the cold water cooling pipeline 32, and the third valve 35c is set on the regulating pipeline 33 , the fourth valve 35d is set on the connecting pipeline.

[0055] By adjusting the opening of the third valve 35c and the fourth valve 35d, the cooling water flow rate of the unit cooling pipeline 31 is controlled, and then the cooling rate of the condenser by the unit cooling pipeline 31 is accelerated or slowed down.

[0056] When the difference between the condensing pressure and the evaporating pressure is lower than the desired pressure difference range, the opening of the third valve 35c is increased, and the opening of the fourth valve 35d is decreased to reduce the pressure in the cooling pipeline 31 of the unit. The cooling water flow rate reduces the cooling capacity of the unit’s...

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Abstract

The invention relates to the field of air conditioners and provides a cold water air conditioner and a cooling water unit and a cooling water control method thereof. The cooling water unit comprises acold water cooling pipeline, a unit cooling pipeline, a water pump, a cold water cooling device and an adjusting pipeline. The cold water cooling device is arranged on the cold water cooling pipeline, and the adjusting pipeline, the cold water cooling pipeline and the unit cooling pipeline are connected in parallel. The water pump is arranged on the cold water cooling pipeline, and at least of the adjusting pipeline and the unit cooling pipeline is provided with a flow adjusting valve; or the water pump is arranged on the unit cooling pipeline, and at least one of the cold water cooling pipeline and the adjusting pipeline is provided with a flow adjusting valve. The cooling degree of a condenser is controlled by controlling the unit cooling pipeline by adjusting the apertures of the flowadjusting valves, so that the condenser is prevented from being cooled excessively and a phenomenon that the pressure difference between a condensing pressure and an evaporating pressure is too low isavoided, and therefore, normal operation of a unit is kept for a long time in a low-temperature environment favorably.

Description

technical field [0001] The invention relates to the field of cold water air conditioners, in particular to a cold water air conditioner, a cooling water unit thereof, and a cooling water control method. Background technique [0002] The data room has high requirements for refrigeration, requiring uninterrupted constant temperature cooling throughout the year. In addition to the unit unit, the existing chilled water-cooled air conditioner also has a cooling water unit and a chilled water unit. The chilled water unit is cycled between the data room and the evaporator. The cooling capacity of the evaporator is brought to the data room through chilled water, and the cooling water unit cools the condenser, which is conducive to improving the cooling accuracy of the air conditioner and meeting the constant temperature cooling requirements of the data room. [0003] However, when cooling in winter, due to the small cooling capacity of the air conditioner, the pressure difference be...

Claims

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Application Information

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IPC IPC(8): F25B41/04F25B41/20
CPCF25B2500/07F25B41/20
Inventor 梁相之李明罗建飞黄童毅石海勇彭金成刘廷亮
Owner GREE ELECTRIC APPLIANCES INC
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