Patent ID: 7997331

Claim:
An air-conditioning system comprising: a compressor compressing refrigerant, first and second blowers, a first evaporator forming a refrigeration cycle apparatus along with said compressor, the first evaporator cooling air blown from said first blower by evaporation of said refrigerant, a second evaporator arranged in parallel with said first evaporator in a flow direction of said refrigerant from said compressor, the second evaporator cooling air blown from said second blower by evaporation of said refrigerant, means for detecting a temperature of vented air blown out from said first evaporator, and means for controlling said compressor to bring a vented air temperature blown out from said first evaporator close to a target evaporator temperature based on a detected value of said detecting means, first means for judging that a surface of said second evaporator is not frosting up when at least one of the blowing rate of said second blower is equal to or greater than a predetermined flow rate and said detected value of said detecting means is equal to or greater than a first temperature; and second means for judging that the surface of said second evaporator is frosting up when a blowing rate of said second blower is less than said predetermined flow rate and said detected value of said detecting means is less than said first temperature, and means for reducing an amount of discharge of the refrigerant from said compressor for defrosting said second evaporator when it is judged that the surface of said second evaporator is frosting up by said second judging means.