Why don't supermarket of air-conditioner temperature drop down?

first, supermarket freezers adiabatic or sealed performance is poor, cold mass loss very big pipe, hot plate, such as the insufficient thickness of insulation, insulation materials and the result is bad. Mainly choose the wrong when the design of insulation layer thickness, or construction insulation quality is bad. In addition, in the process of construction, the insulation moisture resistance of the insulating layer, the moisture content in the thermal insulation layer, deformation may occur and corrosion, heat insulation ability to drop, cooling capacity loss also increases, the temperature drop will be at a discount greatly. Cooling loss of another important reason is that the sealing performance is bad, the introduction of more hot air from the leak. Generally speaking, if the threshold or commercial freezer adiabatic ends phenomenon in a seal, the seal is not strict. In addition, if many people often closed or open time is too long, cold mass loss will increase. Try not to open the door, in order to avoid the hot air in as much as possible. Of course, if the inventory is frequent or receive amount is too large, the heating load will rise sharply, cooling to the specified temperature usually takes a long time. Second, the evaporator surface frost is too thick or too much dust, heat transfer effect will slow down the temperature drop another important reason is the low efficiency of heat transfer in the evaporator. This is because of the frost on the surface of the evaporator is too thick, or dust accumulation is too much. Since most of the surface temperature of the air-conditioner evaporator is lower than 0 ℃ and relative humidity is higher, so the moisture in the air easy to frost and freezing in the surface of the evaporator, which affects the effect of heat transfer in the evaporator. Defrost regularly, in order to avoid the evaporator surface frost thickness. Here are two simple methods of defrosting. (1) stop the defrosting. Compressor stop working, and opened the door, to raise the temperature again, such as automatic melting frost layer, and then again to start the compressor. (2) the frost. After will move out of the contents of air-conditioner, with higher temperature of the water discharge pipe flushing evaporator surface directly, melted the frost layer or whereabouts. Frost thickness, effect of heat transfer in the evaporator is bad, and for a long time don't clean, evaporator surface dirt is too thick, heat transfer efficiency to be markedly reduced. Third, supermarkets have more air and refrigeration oil in the air-conditioner evaporator, fall evaporator heat transfer effect of the pipe inner surface attached more frozen oil, heat transfer coefficient should be reduced. Also, the more air in the pipe, the smaller area of heat transfer in the evaporator, the heat transfer efficiency decreases obviously, temperature drop speed will be slow. Therefore, in the daily operation and maintenance, in order to improve the efficiency of the evaporator heat transfer, must promptly remove the evaporator of the pipe inner surface oil, side by side out of the air inside the evaporator. Fourth, the throttle valve regulating improper or congestion, improper refrigerant flow is too big or too small throttle control or jam will directly affect the into the evaporator refrigerant flow. Throttle valve drive too large, refrigerant flow is big, evaporating pressure and high evaporation temperature, the temperature drop rate will reduce. In addition, if the throttle open or very small blockage, refrigerant flow would also reduce the system cooling capacity will reduce, warehouse would also reduce the temperature to reduce speed. In general, by observing the evaporation pressure, evaporation temperature and suction pipe frost, can ensure adequacy of throttling refrigerant flow. Throttle valve block is the important factors that affect the refrigerant flow, the main cause of throttle valve block is block of ice block and dirty. Block of ice for dryer drying effect is bad, because your port display field LengMei contains moisture, choke flow when the temperature fall below 0 ℃, LengMei water will freeze and plug the throttling hole; Dirty jams in throttle import filter accumulated more dirt, cold agent cannot normal circulation, resulting in a jam.

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