| 摘要 |
PROBLEM TO BE SOLVED: To further inexpensively cope with heating quantity control of a heating means for preventing dew condensation. SOLUTION: An outside air temperature sensor is installed on a refrigerant pipe in the outlet vicinity of a condenser in a refrigerating plant, and commonly uses an originally arranged sensor for detecting failure of the refrigerating plant. Since a flow of a refrigerant is hardly caused when stopping the refrigerating plant such as before starting the refrigerating plant or until the refrigerating plant is driven again (in the timing A) after finishing defrosting operation, a temperature of the refrigerant pipe in the outlet vicinity of the condenser becomes equal to an outside air temperature. Thus, a detecting temperature of the outside air temperature sensor at refrigerating plant stopping time is taken in a control means as the outside air temperature, and a power supply rate to a dew condensation preventive heater is controlled according to a difference between this outside air temperature and a shed inside temperature, and a surface temperature of the port edge of an inlet-outlet is maintained at a temperature causing no dew condensation. The dew condensation can be surely prevented while restraining waste of electric power, and an existing temperature sensor is used in common as the outside air temperature sensor to inexpensively cope with the control. COPYRIGHT: (C)2004,JPO
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