An electronic expansion valve control method for an air-cooled chilled or hot water unit
An electronic expansion valve and control method technology, applied in refrigerators, refrigeration components, mechanical equipment, etc., can solve the problems of waste of resources, unavailability, and high superheat, so as to improve operating efficiency, reduce maintenance costs, and achieve precise control. Effect
Active Publication Date: 2017-09-29
NANJING TICA AIR CONDITIONING CO LTD
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Problems solved by technology
However, the traditional unit absorbs the heat in the water and discharges it into the air while producing cold water for the air conditioner, so that this part of the heat is dissipated in the air and cannot be used.
Most of the existing recyclable units adopt multiple throttling devices, using capillary tubes or thermal expansion valves for throttling, which cannot meet the requirements of refrigerant flow and throttling adjustment in a wide range of working conditions, making it easy for the unit to operate under certain working conditions. Serious liquid entrainment, excessive discharge pressure, etc. may damage the compressor, seriously affecting the reliability and safety of the system
At the same time, the system cannot be precisely controlled, resulting in excessive overheating, which prevents the ability from being fully utilized, resulting in a waste of resources
Method used
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0019] Such as figure 1 shown.
[0020] An air-cooled cold water or hot water unit, including a compressor 18. The exhaust port of the compressor 18 is connected to the first four-way reversing valve 1 , and its air return port is connected to the outlet of the gas-liquid separator 17 . The first four-way reversing valve 1 is also connected to the second four-way reversing valve 2 , the inlet of the gas-liquid separator 17 and the hot water heat exchanger 4 . The second four-way valve 2 is also respectively connected to the air heat exchanger 3 , the inlet of the gas-liquid separator 17 and the water heat exchanger 16 . The hot water heat exchanger 4 is connected to the air heat exchanger 3 after passing through the first one-way valve 7 and the first electronic expansion valve 6 . The air heat exchanger 3 is connected to the water heat exchanger 16...
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The invention relates to an electronic expansion valve control method of an air-cooled cold water or hot water unit, which comprises a compressor, two four-way reversing valves, two electronic expansion valves, an air heat exchanger, a hot water heat exchanger and water Heat exchanger and other components, as well as multiple temperature sensors, the control method of the electronic expansion valve includes: determining the initial opening degree and target exhaust superheat degree according to the ambient temperature; real-time detection of exhaust temperature and condensation temperature of each heat exchanger; calculation Calculate the actual exhaust superheat and compare it with the target exhaust superheat; adjust the opening of the electronic expansion valve. The invention has the advantages of simple structure, convenient operation, more precise control, improved operating efficiency of the unit, and reduced maintenance cost.
Description
technical field [0001] The invention relates to an air conditioner control method, in particular to a control method for an electronic expansion valve in an air conditioner, in particular to an electronic expansion valve control method for an air-cooled cold water or hot water unit. Background technique [0002] At present, air-cooled chilled water or hot water units have been widely used in the commercial field. However, the traditional chiller absorbs the heat in the water and discharges it into the air while producing cold water for the air conditioner, so that this part of the heat is dissipated in the air and cannot be used. Most of the existing recyclable units adopt multiple throttling devices, using capillary tubes or thermal expansion valves for throttling, which cannot meet the requirements of refrigerant flow and throttling adjustment in a wide range of working conditions, making it easy for the unit to operate under certain working conditions. Serious liquid ent...
Claims
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IPC IPC(8): F25B49/00F25B41/04F25B41/31
CPCF25B49/00F25B41/20
Inventor 张自庆
Owner NANJING TICA AIR CONDITIONING CO LTD