Another important cause of slower temperature drop on the surface of the evaporator is that the heat transfer efficiency of the evaporator is low. This is mainly due to excessive frost or excessive dust on the surface of the evaporator. . Since the surface temperature of the carbody evaporator is mostly lower than 0 ° C, and the humidity of the car body is relatively high, the moisture in the air is easily frosted on the surface of the evaporator, and even freezes, which affects the heat transfer effect of the evaporator. To prevent the surface of the evaporator from being too thick, it needs to be defrosted periodically. There are two methods of defrost, as follows:
1 stop defrost. That is to stop the compressor operation, open the door of the car, let the temperature of the car rise, and then restart the compressor after the frost layer is automatically melted.
2 flushing cream. After the goods in the car are carried out, the surface of the evaporator pipe is directly washed with tap water having a relatively high temperature to dissolve or fall off the frost layer. In addition to excessive frosting, the heat transfer effect of the evaporator is not good. The surface of the evaporator is too thick for long-term uncleaning, and its heat transfer efficiency is also significantly reduced.
