| 摘要 |
<p>PURPOSE:To guarantee safe operation for the side of a compressor upon actual operation under the violent fluctuation of atmospheric condition by a method wherein frosting and defrosting sensors, detecting both temperatures of frosting and the finishing of defrosting, are mounted on the tube wall of suction path of the compressor. CONSTITUTION:The frosting and defrosting sensors 11, detecting respective temperatures of frosting and finishing of defrosting, are mounted on the tube wall of suction path of the compressor. During the period of time T1 after operation, frosting characteristic is shown, then, a four-way valve 3 is switched immediately and temperature characteristics after the defrosting operation are show after a time T1', thereafter, the defrosting of a heat collector 9 is finished and liquid refrigerant is returned to the compressor 1 again after a time T2. In case the frosting temperature has become lower than a reference frosting temperature (a0) or the variation of frosting temperature has become larger than the value of fluctuation (a0-a1) from the reference frosting temperature (a0), the operation is brought into defrosting operation mode gradually. On the other hand, the temperature of the suction tube wall becomes high after entering into defrosting operation, then, the defrosting operation is finished and the mode of operation is returned to heat collecting operation mode in case the tube wall temperature has arrived at a reference defrosting finishing temperature (b0) or the defrosting is finished and the value of fluctuation of the tube wall temperature has exceeded a predetermined value (b0-b1).</p> |
