Anti-freezing control method for water chilling unit

A technology of chillers and control methods, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of water-side protection temperature sensing lag, prevent refrigerant water freezing failure, ensure continuous operation, and reduce maintenance workload Effect

Active Publication Date: 2021-12-31
中国船舶重工集团公司第七0四研究所
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Problems solved by technology

[0003] After searching, Zhou Xuan published "Research on Antifreeze Technology of Chiller Units" in the 6th issue of "Building Energy Conservation" in 2013, summarizing various antifreeze protection methods of current chiller units. At the same time, this document analyzed the shortcomings of water side protection with temperature perception lag

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  • Anti-freezing control method for water chilling unit

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0014] Such as figure 1 The schematic diagram of the anti-freezing control method of the chiller is shown, and the PLC program is based on the suction pressure P of the refrigeration system of the chiller in real time. a Calculate the evaporation temperature t. When the evaporation temperature t drops to less than or equal to 1°C, the mode switch switches the feedback signal and the set value of the compressor energy regulation control loop to the antifreeze control mode. The antifreeze control mode: when the compressor cooling capacity output is greater than Equal to 50%, that is, w...

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Abstract

The invention relates to an anti-freezing control method for a water chilling unit. The water chilling unit performs refrigerant water anti-freezing control in operation by adopting an energy regulation mode of variable feedback parameters, and when a refrigerant water freezing risk occurs, the refrigerating capacity output is automatically reduced; and the refrigerant water freezing fault is fundamentally prevented in the mode that the evaporation temperature is kept at 0 DEG C or above, protection shutdown is not needed, continuous operation of the water chilling unit is guaranteed to the maximum extent, and the maintenance workload of personnel is reduced.

Description

technical field [0001] The invention relates to a marine air-conditioning technology, in particular to an antifreeze control method for a chiller. Background technique [0002] When the system load drops suddenly during the operation of the chiller or the refrigerant water flow drops suddenly due to the dirty evaporator, it is easy to cause the evaporator to freeze, especially for the chiller with a plate evaporator. The risk of this failure is greater. At present, the most widely used method is to set the temperature controller or flow switch. When the outlet temperature of the refrigerant water is lower than 3°C or the flow rate of the refrigerant water is lower than the protection value, the protection switch will stop the operation of the chiller. [0003] After searching, Zhou Xuan published "Research on Antifreeze Technology of Chiller Units" in the 6th issue of "Building Energy Conservation" in 2013, summarizing various antifreeze protection methods of current chiller...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/02
CPCF25B49/02Y02B30/70
Inventor 丁之劼叶琳曹承毛函晔茅一峰
Owner 中国船舶重工集团公司第七0四研究所
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