【 Weak current College 】 refrigerator temperature drops down and fall slowly several causes

Refrigerator temperature drops down and fall slowly is more common phenomenon. Temperature falling to the library is slow for a brief analysis, looking to peer friends work a little bit of help.

1, cold storage insulation or sealing performance, resulting in the loss of large cold

Insulation performance is due to the heat insulation of pipelines, storage wall insulation thickness, heat insulation and heat preservation effect bad, it is a design-time selection of improper insulation thickness or construction insulation materials of poor quality. In addition, in construction, insulation materials and thermal insulation and moisture-resistant performance may be damaged lead insulation against moisture, deformation, or erosion, decline in its insulation capacity, library and cold with increasing the amount of loss, decreased significantly slow down the temperature of the library. Lead-cooled loss of another important reason is that the Treasury seal performance difference, there are more hot air from the air force into the Treasury. General to the warehouse door seal or a cold-insulation wall seal appears closed dew phenomenon, there is a tight seal. In addition, frequent switching warehouse door or more people into the public coffers, it will increase the cooling capacity loss to the Treasury. Avoid opening the door to prevent large amounts of hot air into the Treasury. Of course, the Treasury into stock frequently or purchase quantity is too large, the thermal load grows, it is necessary to cool down to provide temperature generally take a long time.

2, evaporator surface frosting too thick or too much dust, heat transfer efficiency decline

Result in slow decline in the library-another important reason is the evaporator heat low, this is mainly due to the evaporator surface Frost layer too thick or too much dust. Due to the cold evaporator surface temperature are lower than 0 ° c and relative humidity to the Treasury, the moisture in the air is extremely vulnerable in the evaporator surface frosting, even ice, affect the evaporator effect. In order to prevent the evaporator surface Frost layer too thick, it regularly defrosting. The following describes two simple methods of defrosting: defrost ① downtime. That is, stop the compressor running, open the door to the Treasury, let the library temperature rebound to melt frost layer automatically, and then restart the compressor. ② Red cream. The warehouse of goods moved out, the direct use of temperature higher water flushing evaporator tube surface, so that the Frost melts or shedding. In addition to the frosting is too thick will cause the evaporator heat transfer is not optimal, the evaporator surface for a long time is not too thick dust clean-up and, with the heat also decreased significantly.

3, evaporator in more air or frozen oil, heat transfer efficiency decline

Once the evaporator inside surface attached more frozen oil, heat transfer coefficient will decrease, similarly, if the tubes in more air, evaporator heat transfer area decreases, its heat has a significant drop, drop rate Treasury temperature with ease. Therefore, in the day-to-day operation and maintenance, it should be noted that the timely clear evaporator heat transfer tubes surface oil and exhaust air evaporator to enhance the evaporator heat transfer efficiency.

4. improper or blocking throttle modulation, the refrigerant flow is too large or too small

Throttle valve regulated inappropriate or blocked, have a direct impact on the access to the refrigerant flow evaporator. When the throttle opening through large, refrigerant flow on the high side, evaporation pressure and evaporation temperature is the temperature rises, the Treasury will slow down the rate of decline; at the same time, when the throttle opening to spend small or plug, refrigerant flow is reduced, the systems of cooling capacity will decrease the temperature drops, the Treasury will slow down the speed. Generally available through observation of evaporation pressure, evaporation temperature and suction tube frosting to judge the appropriateness of throttle refrigerant flow. Throttle valve plug is an important factor of refrigerant flow, caused the throttle valve plug is mainly due to blockage and dirty plugging. Ice barrier is due to the dryer drying effect, refrigerant contains water, flowing through the throttle, the temperature drops to 0 degrees centigrade, refrigerant water ice and blocking throttle valve hole; dirty plugging is due to the throttle valve inlet filter online accumulated more dirt, refrigerant circulation impeded, forming a plug.

5, the amount of refrigerant in the system is insufficient, inadequate refrigeration capacity

Refrigerant recycling capacity is insufficient for two main reasons, first is the refrigerant charge, at this point, simply fill in the amount of refrigerant foot. Another reason is that the system refrigerant leakage, caught in this situation, you should find a leak, the key to check if the connection pipe, valve, identified leaking part patch, then filling in plenty of refrigerant.

6, compressor efficiency low, cooling capacity cannot meet Treasury load requirements

Compressor due to long-term operation, cylinder liner and piston rings, etc due to wear, with clearance increases, the sealing property will decrease, compressor gas coefficient is lower, the cooling capacity will be reduced. When the cooling capacity is less than the heat load to the Treasury, will cause the temperature slowly to the Treasury. You can observe the compressor suction and discharge pressure substantially determine the compressor refrigeration capacity. If the compressor refrigeration capacity decreases, a common approach is to replace a compressor cylinder liner and piston rings, if replacement is not pooled effect, you should consider other factors, even dismantle, troubleshooting and repair.
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