The analysis of the causes of cold storage temperature drops slowly

refrigerator temperature drop and slow down is more common phenomenon. Now a brief analysis of the cause of the cold storage temperature drop slowly, hope can bring friends of cold storage work with a little help.

1, cold storage due to heat insulation or sealed performance is poor, cause a large loss of cold energy

refrigerator heat insulation performance difference is due to the pipe, warehouse wall insulation layer thickness is not enough, such as insulation and heat preservation effect is bad, it is mainly the design when choosing improper or construction of insulation layer thickness of heat preservation material as a result of poor quality. In addition, in the construction, in use process of insulation materials insulation moistureproof performance is likely to be damage to insulation layer be affected with damp be affected with damp, deformation, erosion, and even the loss of heat insulation, library cold energy loss increase, library temperature slowed down significantly. Lead to loss of cold sealing performance is poor, another important reason is the warehouse more hot air from the air leakage into warehouse. The prajnaparamita in warehouse door sealing strip or end seal emerging phenomenon, cold storage insulation wall shows where the seal is not tight. In addition, frequent switch door or more people together into the warehouse, warehouse capacity loss will also increase the warehouse. Should avoid to open the library door to prevent a lot of hot air into the warehouse. Warehouse in stock, of course, frequent or were too big, the heat load increases sharply, the temperature cooled to provisions generally take a long time.

2, refrigerator evaporator surface frost is too thick or too much dust, heat transfer effect down

cold storage temperature is another important reason for the slow decline in the evaporator heat transfer efficiency is low, this is mainly due to the too thickness of evaporator surface frost layer or dust caused by too much. Because of the cold storage most of the surface temperature of the evaporator is lower than 0 ℃, relative humidity and warehouse is higher, the moisture in the air extremely easy in the evaporator surface frost, ice, even influence the effect of heat transfer in the evaporator. In order to prevent the surface of the evaporator frost layer thickness, on a regular basis to defrost. Here are two simpler defrosting methods: (1) stop defrost. Which stop the compressor operation, and opened the door of storeroom, let the library temperature picks up, after being automatic melting frost layer, then restart the compressor. (2) cream. After the goods out of warehouse, with higher temperature of tap water rinse directly evaporator tube surface, to dissolve frost layer or fall off. In addition to the frost too thick will lead to poor performance of the evaporator heat transfer, the evaporator surface due to long-term not cleaning the dust too thick, its heat transfer efficiency will be significantly decreased.

3, cold storage more air or frozen oil, exist in the evaporator heat transfer effect down

refrigerator evaporator once more frozen oil attached on the surface of the heat transfer tube, the heat transfer coefficient will decrease, also, if there is more air in the pipe, the evaporator of the heat exchange area decreases, and its heat transfer efficiency will be significantly lower, the storehouse temperature decreasing speed is slow. In daily operation maintenance, therefore, should pay attention to keep clear of the evaporator heat transfer tube surface oil and discharge the air inside the evaporator, heat transfer efficiency in order to improve the evaporator.

4, refrigerator throttle regulating improper or congestion, refrigerant flow rate is too big or too small

refrigerator throttle valve regulating improper or congestion, will directly affect the flow of refrigerant entering the evaporator. When the throttle valve opening through large, refrigerant flow slants big, evaporating pressure and evaporation temperature is elevated, the storehouse temperature decreasing speed will slow; At the same time, when the throttle valve opening through small or jams, refrigerant flow rate also decreases, and the refrigerating capacity of the system is reduced, the storehouse temperature drop speed will slow too. Generally by observing the evaporation pressure, evaporation temperature and frost situation to judge the suction of throttle valve refrigerant flow. Throttle valve block is the important factors influencing the refrigerant flow, main cause of throttle valve block of ice wall and dirty wall. Ice wall is due to the poor the drying effect of dryer, moisture is contained in refrigerants, flowing through the throttle valve, the temperature fell to below 0 ℃, refrigerant water in the ice and jam throttle hole; Dirty plugging was due to the throttle valve import filter net accumulation of more dirt, refrigerant circulation, plug formation.

5, cold storage refrigeration dose in the system is insufficient, lack of refrigeration capacity

refrigerator refrigerant cycle is enough for two reasons, one is the refrigerant filling quantity is not enough, at this point, just add plenty of refrigerants. Another reason is that the system refrigerant leakage is more, in this kind of situation, should first find funnelled, focusing on the pipes, valves, joints, found to leak after repairing, filling the plenty of refrigerants.

6, the low efficiency of the compressor, refrigerating capacity can not meet the requirement of the warehouse load,

compressor due to long-term operation, such as piston ring and cylinder parts due to wear serious, fit clearance increases, the sealing performance will be reduced, decreases in the coefficient of the gas compressor refrigerating capacity will be reduced. When the heat load capacity is less than warehouse, will cause the warehouse temperature drop slowly. By observing the compressor suction, exhaust pressure approximately determining the compressor refrigeration capacity. If the compressor refrigeration capacity fell, the commonly used method is to replace the compressor cylinder, piston ring and if still cannot work, after replacement should consider other factors, even machine maintenance, troubleshooting.

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