The cooler heat transfer factor

< p > freezers factors of heat transfer in the commercial freezer, if heat transfer effect is not good, so the cooler cooling speed becomes slow, and even produce the phenomenon that no refrigeration. This is because the internal heat out of air-conditioner, it leads to the result. The air-conditioner in the unit heat transfer effect? That is the evaporator. Let the cooler price to tell it in the commercial freezer. ( 1) The influence of the frost layer and dirt on the heat transfer. The evaporator is through the metal surface heat exchange of air. The thermal conductivity of metals is very high, for example: the coefficient of thermal conductivity of aluminum is 203 w/( m。 K) , the copper of 380 w/( m· K) , but the ice and frost thermal conductivity of 2 respectively. 3W/( m· K) And 0. 58W/( m· K) To hundreds of times lower than copper and aluminum. price so evaporator to surface has the thick ice or frost, heat transfer efficiency will be greatly reduced. Especially strong nearly convection finned coil evaporators, frost layer savings will lead to fin narrow gap even blocked duct, make the cold air can't circulation, can cause of air-conditioner work properly. In addition, in the freezer evaporator heat transfer, such as the surface adhesion of dirt, can cause a lot of heat resistance, impact surface of refrigerant liquid lubrication ability, bring down the heat transfer efficiency. In addition, such as refrigerants with lubricating oil, will also affect the heat transfer. ( 2) The influence of air convection velocity on heat transfer. By the higher air velocity on the surface of the evaporator, the higher the heat transfer efficiency. ZhiLengShi freezers is to rely on natural convection air cooling, if between food and the food without the proper clearance between the inside wall, and was very full, very tight, can't normal air convection, heat transfer efficiency and thus reduce the evaporator. Forced convection cooling evaporator, the wind speed is too low or poor duct can make the lower heat transfer efficiency. ( 3) The influence of heat transfer temperature difference of heat transfer efficiency. Evaporator and the bigger the temperature difference of the surrounding air, the higher heat transfer efficiency of the evaporator: phase at the same time, when the temperature difference of air-conditioner in the higher the temperature, the lower the heat transfer efficiency. ( 4) Characteristics of refrigerant to the evaporator heat transfer. Refrigerant boiling ( Vaporization) When the cooling intensity, the refrigerant flow velocity and the size of the coefficient of thermal conductivity of will directly affect the performance of heat transfer in the evaporator. When the refrigerant boiling heat intensity with heated surface temperature increased with the increase of the difference between the saturation temperature and. K value increases the heat transfer area can be reduced accordingly. Air-conditioner refrigerant flow velocity in the heat transfer coefficient is also big. Everything the R12 worse than heat transfer efficiency, also is a bit poor in R600a, and the heat transfer efficiency of R12 had better. < br / > < / p >
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