Method and system for controlling a chiller

Abstract

The invention discloses a control method and system for a water chiller. A bypass pipe is used to bypass the low-temperature liquid refrigerant at the bottom of the condenser to the exhaust port of the compressor, and the gas refrigerant discharged from the compressor is mixed with the low-temperature liquid refrigerant flowing out of the bypass pipe. , to perform heat exchange, reduce the superheat of the gas refrigerant, and at the same time reduce the pressure and temperature at the exhaust port, effectively reduce the back pressure of the compressor, increase the flow rate of the compressor; at the same time reduce the noise of the exhaust pipe; and, The control method of the present invention obtains the refrigerant temperature T1 in the exhaust pipe, obtains the saturation temperature T2 of the condenser, calculates the difference △T=T1-T2, and adjusts the opening of the valve according to the difference △T, so that △T is equal to the set value Temperature difference; that is, make the difference ΔT between the refrigerant temperature in the exhaust pipe after heat exchange and the saturation temperature of the condenser equal to the set temperature difference, reduce the noise of the exhaust pipe, and improve the heat exchange efficiency of the condenser.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a method and system for controlling a chiller. Background technique [0002] At present, although the central air-conditioning units of various companies can operate stably in the market, they all face common problems: [0003] 1. The operating noise of the unit is large, part of the noise is the mechanical noise generated when the compressor is running, and part is the gas dynamic noise generated by the high-speed superheated gas refrigerant discharged from the impeller; [0004] 2. The surge point is high, and it is difficult for the unit to operate at low load; [0005] 3. The heat exchange efficiency of the condenser is not high, and it is generally equipped with heat exchange tubes for eliminating overheating and low heat exchange efficiency. Contents of the invention [0006] The invention provides a control method of a chiller, which improves the h...

AI Technical Summary

Problems solved by technology

[0003] 1. The operating noise of the unit is large, part of the noise is the mechanical noise generated when the compressor is running, and part is the gas dynamic noise generated by the high-speed superheated gas refrigerant discharged from the impeller;

[0004] 2. The surge point is high, and it is difficult for the unit to operate at low load;

[0005] 3. The heat exchange efficiency of the condenser is not high, and it is generally equipped with heat exchange tubes for eliminating overheating and low heat exchange efficiency

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