In order to solve the problem of the probable wet compression and temperature fluctuation of cold storage after liquid refrigerant defrosting operation

the method of fan delayed running is proposed. Taking the delayed time of fan running as a variable parameter

the experiment has conducted under the condition of ﹣20 ℃ cold storage temperature and 3 kg weight of frost with the delayed time of fan running from 0 s to 180 s after the finish of defrost. The system parameters such as temperature fluctuation of cold storage after the finish of defrosts

defrosting time and the suction parameters of the compressor after system returning to work are analyzed and compared for different delay time of fan running. The result shows that running the fan without delay after defrosting

the cold storage temperature will sudden rise 5 ℃ and wet compression occurs for the first 4 min after refrigeration is resumed; the best delay time of fan running is 140 s to 180 s after defrosting and the rise of temperature in cold storage is 3 ℃ lower than that in the condition without fan delaying

and the temperature fluctuation of cold storage is within 5 ℃.The defrosting time is about 12 min

and the probable wet compression is completely avoided after refrigeration system returns to work.