| 摘要 |
PURPOSE:To operate a space-cooling apparatus efficiently according to the load, by switching the capacity of a compressor, for instance, when the temperature of air at the outlet of an evaporator, the temperature of air discharged from a duct, etc. have reached prescribed values, and effecting on-off control of the compressor, for instance, when the pressure of suction gas of the compressor has reached a prescribed value. CONSTITUTION:When a compressor is set into 100% operation after starting its operation, the temperature Te of air at the outlet of an evaporator, temperature Tf of air discharged from a duct and pressure Ps of suction gas of the compressor are all lowered. When the pressure Ps reaches a prescribed value Ps2, 100% operation of the compressor is stopped, while when Ps reaches a prescribed value Ps1, the compressor is again set into operation. When the room temperature becomes a proper level while repeating the above procedures, the temperature Tf is raised by increasing the heating power of a heater disposed in the duct. Further, when the temperature difference between Tf and Te reaches a prescribed value DELTATfe2, operation of the compressor is switched from 100% to 50% operation. Under the 50% operation of the compressor, on- off control for the compressor based on the value of Ps is continued. |
