Frostless air handling unit and proportion-integration-differential control method thereof
A technology for air handling units and controllers, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of short system life, frosting, low operating efficiency of air handling units, etc., to extend service life and improve performance. , the effect of stability and security assurance
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[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0039] Such as figure 1 and figure 2 As shown, the frost-free air handling unit of the present invention includes a compressor assembly 1 , a condenser 2 , an electronic expansion valve 3 , an evaporator assembly 4 , a liquid accumulator 5 , and a thyristor power regulator 7 . Compressor assembly 1 , condenser 2 , electronic expansion valve 3 , and evaporator assembly 4 are connected in series in a circulating working circuit through pipelines, and liquid accumulator 5 is installed between the outlet of condenser 2 and electronic expansion valve 3 .
[0040] The evaporator assembly 4 includes a fan 41 , a multi-branch evaporating coil 42 , a superheating coil 43 , a temperature and humidity sensor 44 , a first temperature sensor 45 , a first pressure sensor 46 and a calculation controller 47 . The overheating coil 43 is arranged at...
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