1, due to the freezer insulation or sealing performance is poor, resulting in large cold loss
The reason why the poor thermal insulation performance is because the pipeline, insulation board and other insulation layer thickness is not enough, insulation and thermal insulation effect is not good, it is mainly the design of the insulation layer thickness is not selected properly or the construction of the insulation material quality is poor. In addition, in the process of construction, the insulation material insulation moisture resistance may be damaged resulting in insulation layer moisture, deformation, or even rotten, its heat insulation and thermal insulation ability to decline, the cold loss increases, the temperature drop significantly slowed down. Another important reason for the cold loss is the poor sealing performance, there are more hot air from the leakage invasion. Generally, if the sealing strip in the door or cold cabinet heat insulation sealing phenomenon, it shows that the seal is not tight. In addition, frequent opening and closing of the door or more people together into the warehouse, will also increase the cold loss. Should try to avoid opening the door to prevent a lot of hot air into. Of course, into the inventory frequently or too large a quantity of goods, the heat load increases dramatically, to cool down to the required temperature generally takes a long time.
2, the evaporator surface frost is too thick or too much dust, the heat transfer effect decreases leading to a slow decline in temperature is another important reason for the evaporator heat transfer efficiency is low, which is mainly due to the evaporator surface frost layer is too thick or too much dust caused by. Due to the cold cabinet evaporator surface temperature is mostly below 0 ℃, and humidity is relatively high, the moisture in the air is very easy in the evaporator surface frost, or even ice, affecting the heat transfer effect of the evaporator. In order to prevent the evaporator surface frost layer is too thick, it is necessary to defrost it regularly.
Here are two simple defrosting methods:
①stop the machine to melt frost. That is, stop the compressor running, open the door, let the temperature rise, to be automatically melted frost layer, and then restart the compressor. ② Frost. After moving the goods out of the freezer, directly with a higher temperature of tap water to flush the evaporator tube surface, so that the frost layer dissolved or fall off. In addition to the thick frost will lead to the evaporator heat transfer effect is not good, the evaporator surface due to a long period of time without cleaning and dust accumulation is too thick, its heat transfer efficiency will also be significantly reduced.