Effect of defrosting on evaporator condenser

1, the impact of frost on the refrigeration system
The surface temperature of the evaporator during normal operation of the cold storage refrigeration system is much lower than the dew point temperature of the air, and the water in the food and air will precipitate and condense on the tube wall. If the tube wall temperature is below 0°, the water dew will condense into frost. Frost formation is also the result of normal operation of the refrigeration system, so a small amount of frost formation is allowed on the evaporator surface.
Because the thermal conductivity of the frost is too small, it is one percent of the metal, or even a few percent, so the frost layer forms a larger thermal resistance. Especially when the frost layer is thick, like heat preservation, the cold amount in the evaporator is not easy to emit, affecting the refrigeration effect of the evaporator, and ultimately making the cold storage less than the required temperature. At the same time, the evaporation of refrigerant in the evaporator should also be weakened, and the incomplete evaporation of ammonia may be inhaled by the compressor and cause a liquid strike accident.
2, the impact of defrost on the local environment
There are many methods of defrosting, such as manual defrosting, refrigerant hot melt frost, water defrosting, electric defrosting and so on. For smaller refrigeration systems, manual defrosting and electric defrosting can be used, but should be carried out when the system is out of operation. For larger refrigeration systems, refrigerant hot melt frost and water defrost should be used. Due to the heat source of the exhaust hot melt frost of the compressor, the hot melt frost of the refrigerant should be carried out under the conditions of the operation of the refrigeration system. In this way, it seems that no matter what kind of defrosting method is used, it must affect the cold storage temperature, especially the refrigerant hot melt frost, because it must be divided into warehouses, that is, a part of the warehouse stops refrigeration, and the other part of the warehouse defrosts, the defrosting time is longer, and the impact on the warehouse temperature is greater. If the warehouse temperature fluctuation is too large, it will affect the quality of the food in the warehouse, especially the quality of fresh food. The melted frost should be cleaned in time, otherwise it will cause freezing of the warehouse floor.