In addition to cold storage without refrigeration and cold storage insulation performance difference between the previously mentioned evaporator cooling problem, there are two common problems also affect the storage temperature decreases slowly below to explain to everyone:
First, there are more [evaporator air or frozen oil, heat transfer effect is reduced]
Once the inner surface of the evaporator heat transfer tubes attached more refrigeration oil, the heat transfer coefficient will be reduced. Similarly, if there is more air, heat transfer tube evaporator heat transfer area is reduced, heat transfer efficiency will be significantly decreased, the temperature drop rate on the Treasury subsequently slowed. Thus, in the daily operation and maintenance, attention should be promptly removed in the evaporator heat transfer tube surface oil and exhaust air in the evaporator, the evaporator in order to improve heat transfer efficiency.
Second, [the throttle improperly adjusted or blocked, the refrigerant flow is too large or too small]
Throttle improperly adjusted or blocked, it will directly affect the refrigerant into the evaporator flow rate. When the throttle valve opening too large, the refrigerant flow rate is too large, the evaporation pressure and evaporation temperature also increased, the Treasury temperature rate of decline will slow; the same time, or when the throttle valve opening is too small blockage, the refrigerant traffic is also reduced, capacity of the system is also decreased, the Treasury will also slow the rate of temperature decrease. Usually by observing the evaporation pressure, temperature and evaporation frost situation to determine the intake pipe throttle the refrigerant flow is appropriate. Throttle valve blockage is an important factor affecting the flow of refrigerant, the main cause of the throttle valve is clogged ice blocking and fouling. Ice block is due to poor drying effect of the dryer, the refrigerant contains water that flows through the throttle valve, the temperature dropped below 0 ℃, the refrigerant in the water into ice clogging the throttle bore; fouling is Since the throttle valve inlet filter medium accumulated more dirt, refrigerant circulation by the formation of blockages.
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