Effect of evaporator frost on thermal condition of cold storage

In order to explore the influence of evaporator frost on the thermal conditions of cold storage,this paper provides the scientific basis for the cold storage in a timely manner of frost and frost-free operation.The ten tons and three HP and dual temperature controlled cold storage is studied,dynamically monitoring cold storage temperature,frost temperature,the temperature difference of evaporator air inlet and outlet and power consumption,and three-dimensional temperature field of the outer surface of the evaporator is drawn.The results show that before evaporator frosted,the cycle change of cold storage temperature is more stable.Cold storage operation cycle consisting of three phases turns into two stages of fan running and cooling,and the lowest cold storage temperature is gradually increased so that it can not reach the setted lower limit.The changing range of cycle is reduced and time is shortened.After evaporator frosted,frost temperature cycle minimum value reaches setted lower limits and cold storage could not operate within the scope,then the cooling efficiency of the evaporator is decreased.The temperature difference of the air inlet and outlet is reduced because evaporator frost and cold storage power consumption increased by 147.06% to run 12 hours.Three-dimensional temperature field in the outer surface of the evaporator is significantly different and every point temperature has dropped so that it deviates from the designed minimum temperature.The tests show that evaporator with no frost is an important factor to keep cold storage energy saving and operating safe.