The throttle valve is improperly adjusted or blocked, and the refrigerant flow rate is too large or too small.
1. The cold storage heat insulation or sealing function is poor, and the cooling capacity is large.
The heat insulation function is poor because the insulation layer of the pipeline, the warehouse insulation wall, etc. is not thick enough, and the heat insulation and heat preservation effect are poor. It is mainly caused by improper selection of the thickness of the insulation layer during design or poor quality of the insulation material during construction. Shandong cold storage is installed in the process of construction and use. The insulation and moisture-proof function of the thermal insulation material may be destroyed, resulting in the insulation layer being damp, deformed or even smashed. The heat insulation capacity is reduced, the loss of the cold storage capacity is increased, and the storage temperature is significantly reduced. Slow down. In addition, an important reason for the large loss of cold is that the warehouse sealing function is poor, and more hot air invades the warehouse from the leak. Under normal circumstances, if you see condensation on the seal of the warehouse door or the seal of the cold storage wall, it means that the seal is not tight. Moreover, frequent switching of warehouse doors or more people into the warehouse together will also increase the loss of cold storage in the warehouse. Try to avoid opening the library door frequently to prevent a lot of hot air from entering the warehouse. Of course, when the warehouse is frequently stocked or the quantity of goods is too large, the heat load increases sharply, and it takes a long time to cool down to the specified temperature.
2. The surface of the evaporator is too thick or excessively dusty, and the heat transfer effect is reduced. Another important reason for the slow decline of the storage temperature of the cold storage in Shandong is that the heat transfer efficiency of the evaporator is low, mainly because the frost layer on the evaporator surface is too thick. Or caused by excessive dust. Because the surface temperature of the cold storage evaporator is mostly lower than 0 ° C, and the humidity in the warehouse 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. In order to prevent the frost layer on the surface of the evaporator from being too thick, it needs to be defrosted on schedule.
Introduce two simple and easy to operate defrosting methods: 1 stop defrost. That is, the compressor is stopped, the warehouse door is opened, and the temperature of the warehouse is raised. After the frost layer is automatically melted, the compressor is restarted. 2 flushing cream. After the goods in the warehouse are carried out, the surface of the evaporator tube is directly washed with tap water having a relatively high temperature to dissolve or fall off the frost layer. In addition to the 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 the heat transfer efficiency is also significantly reduced.
3. There is more air or refrigeration oil in the evaporator, and the heat transfer effect is reduced. Once the temperature of the small heat storage tube is attached to the inner surface of the heat transfer tube of the evaporator, the heat transfer coefficient will be reduced. Similarly, if the heat transfer coefficient is reduced, There is more air in the heat pipe, the heat exchange area of ​​the evaporator is reduced, the heat transfer efficiency is also significantly reduced, and the temperature drop rate of the warehouse is slowed down. Therefore, in daily operation and maintenance, attention should be paid to timely removing the oil on the inner surface of the evaporator heat transfer tube and discharging the air in the evaporator to improve the heat transfer efficiency of the evaporator.
4. The throttle valve is improperly adjusted or blocked, and the refrigerant flow rate is too large or too small.
Improper adjustment or blockage of the throttle valve will directly affect the flow of refrigerant into the evaporator. When the throttle valve is opened too much, the refrigerant flow is too large, the evaporation pressure and the evaporation temperature are also increased, and the warehouse temperature drop rate will be slowed down; at the same time, when the throttle valve is opened too small or blocked, the refrigerant The flow rate is also reduced, the cooling capacity of the system is also reduced, and the rate of decline in the warehouse temperature will also be slowed down. It is generally possible to determine whether the throttle valve refrigerant flow rate is appropriate by observing the evaporation pressure, the evaporation temperature, and the frosting of the suction pipe. The blockage of the throttle valve is an important factor affecting the flow rate of the refrigerant. The main cause of the blockage of the throttle valve caused by the price of the cold storage is ice blockage and dirty blockage. The ice blockage is caused by the poor drying effect of the dryer. The refrigerant contains moisture. When flowing through the throttle valve, the temperature drops below 0 °C, and the moisture in the refrigerant forms ice and blocks the throttle hole; the dirty plug is Because the throttle inlet filter net contains a lot of dirt, the refrigerant is smooth and smooth, forming a blockage.
5. Insufficient refrigerant amount in the system, insufficient cooling capacity
There are two main reasons for the insufficient refrigerant circulation: First, the refrigerant charge is insufficient, and only a sufficient amount of refrigerant can be added. Another reason is that the system refrigerant leaks more. To catch up with this situation, you should first find the leak point, focus on the connection of each pipe and valve, and find out the leaked parts after repairing, and then charge enough refrigerant.
This article is organized by Shandong Dingsheng Refrigeration Equipment Co., Ltd.! If you have any enquiries, please pay attention to the WeChat public account "Dingsheng Refrigeration" or call 15725158383
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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