Cold storage defrosting control system and control method

Abstract

The invention provides a cold storage defrosting control system and control method. The cold storage defrosting control method comprises the following steps that according to an inlet and outlet temperature of an indoor evaporator, and an initial heat exchange amount Q0 of the indoor evaporator is calculated; according to an inlet and outlet temperature of an outdoor condenser, the flow velocitiesof the indoor evaporator, the outdoor condenser, a throttling device, and a connecting pipeline, and an input voltage and an input current of a compressor, and an actual heat exchange Q1 of an outdoor evaporator is calculated; and whether the actual heat exchange Q1 is less than an initial heat exchange Q0 or not is judged, if yes, defrosting operation is carried out. According to the cold storage defrosting control system and control method, a beneficial frost layer and a harmful frost layer of the surface of the indoor evaporator can be differentiated correctly, and unnecessary damage to storing goods due to the fluctuation in the cold storage or of the environmental temperature caused by defrosting is avoided; and then the cold insulation effect of the cold storage is ensured, retain freshness degree of the food in the cold storage is enhanced, the storage period of the food is prolonged, and market application prospect is high.

Description

technical field [0001] The invention belongs to the field of defrosting of refrigeration systems, and in particular relates to a defrosting control system and method for cold storage. Background technique [0002] At present, the storage temperature of ordinary refrigerators is usually around 0-40°C. The system evaporation temperature of the refrigerator is lower, and the surface temperature of the evaporator in the storage is lower than the ambient temperature, resulting in the formation of granular Ice crystals a "frost layer". Existing research related to defrosting mainly focuses on: diversified defrosting methods, that is, using various methods to remove the existing frost layer. However, there is no accurate control of the timing of defrosting, which often results in empirical defrosting and false defrosting. These programmed defrosting methods, due to the inaccuracy of defrosting timing, will result in lower overall operating efficiency and will cause a lot of waste...

AI Technical Summary

Problems solved by technology

[0004] However, as the thickness of the frost layer increases, the heat insulation effect of the frost layer will gradually play a major role, which will lead to a decrease in the heat transfer effect. The frost layer at this time is called harmful frost. The heat exchange rate decreases rapidly. At this time, the frost layer will greatly affect the evaporation and heat absorption of the refrigerant, reduce the efficiency of the refrigeration cycle, increase energy consumption, and even not refrigerate, which seriously affects the freshness and hygienic conditions of food and materials in the warehouse.

Images