Why is the freezer suddenly not cooling

There are many reasons why the freezer is not cooling. When we find that the temperature of the freezer is not low, not freezing, not cooling or the power consumption increases, the first consideration is whether the freezer is damaged or the insulation layer is damaged, which makes the heat insulation or sealing performance of the freezer worse. , resulting in increased cooling loss.

Usually, the poor thermal insulation performance of the freezer is due to the insufficient thickness of the thermal insulation layer of pipes, warehouse thermal insulation walls, etc., and the poor thermal insulation and thermal insulation effect. It is mainly caused by improper selection of thermal insulation layer thickness during design or poor quality of thermal insulation materials during construction. In addition, in the process of construction and use, the thermal insulation and moisture-proof performance of the thermal insulation material may be damaged, resulting in moisture, deformation, or even erosion of the thermal insulation layer. . Another important reason for the large cooling loss is the poor sealing performance of the warehouse, and more hot air intrudes into the warehouse from the leak. Generally, if there is condensation on the sealing strip of the warehouse door or the sealing of the insulation wall of the freezer, it means that the sealing is not tight. In addition, frequent opening and closing of the warehouse door or more people entering the warehouse together will also increase the cooling loss of the warehouse. Avoid opening the warehouse door as much as possible to prevent a large amount of hot air from entering the warehouse. Of course, when the warehouse is frequently stocked or the stock is too large, the heat load increases sharply, and it generally takes a long time to cool down to the specified temperature.

The second is that there may be a problem with the heat dissipation performance of the freezer equipment of the freezer manufacturer. Generally, the surface of the evaporator is too thick or dusty, resulting in a decrease in the heat transfer effect.

Another important reason for the slow drop of the general storage temperature is the low heat transfer efficiency of the evaporator, which is mainly caused by the thick frost layer or excessive dust accumulation on the surface of the evaporator. Since the surface temperature of the evaporator of the freezer is mostly lower than 0°C, and the humidity of the warehouse is relatively high, the moisture in the air can easily form frost or even ice on the surface of the evaporator, which affects the heat transfer effect of the evaporator.

In order to prevent the surface frost layer of the evaporator from being too thick, it needs to be defrosted regularly. Here are two simpler defrosting methods:

1. Frost flushing: After removing the goods from the warehouse, directly flush the surface of the evaporator pipe with tap water with a higher temperature to dissolve or fall off the frost layer.

2. Stop defrosting: stop the compressor running, open the warehouse door, let the temperature of the warehouse rise, and restart the compressor after the frost layer melts automatically.