| 摘要 |
PROBLEM TO BE SOLVED: To prevent frost from exfoliating and falling from an evaporator in the form of a lump in an early time of defrosting operation and hence melt and remove the frost by controlling the rotational speed of a condenser fan in response to sucked gas temperature upon the defrosting operation. SOLUTION: When upon defrosting operation detected temperature by a sucked gas temperature sensor 12 is inputted into a fan speed determining means 21 of a fan controller 20, the fan speed determining means 21 determines the rotational speed of a condensation fan 3 based upon a control rule inputted from a control rule storage means 22, and the determination is outputted to a driving motor 9 to control the speed of the condensation fan 3. Thus, upon defrosting operation the rotational speed of the condensation fan 3 is lowered in response to lowering of the sucked gas temperature, and following this capacity of the condenser 3 and the amount of absorbed heat are lowered so that the amount of heat radiation in the evaporator 5 is also lowered. As a result, frost is prevented from being exfoliated in the form of lump and falling in an early time of the defrosting operation. |
