Factors influencing the heat transfer of refrigerant

1, steam flow and flow velocity in the condenser, refrigerant vapor condensed after come in contact with the wall of low temperature heat release is a layer of liquid membrane, and under the action of gravity flow down. Liquid membrane has the thermal resistance of thermal conductivity, its thickening will lead to thermal resistance increases, the refrigerant heat transfer is reduced. Therefore, when the refrigerant vapor and condensate film towards the same direction, the separation of the liquid film and wall heat transfer quickly, increase heat transfer system apply. Beijing refrigerant manufacturer hint when the refrigerant vapor and condensate film movement in the opposite direction, the heat transfer coefficient to reduce or increase will depend on the flow rate of the refrigerant vapor. Velocity is small, the liquid film flow is slow, thickened liquid membrane, heat transfer coefficient; Velocity is larger, the liquid film will be refrigerant vapor with upward mobility, and blow, then heat transfer coefficient increases. 2, the roughness of the wall heat transfer heat transfer surface roughness has a great influence on the thickness of the condensate film. When the surface is very rough, liquid film flow resistance will increase, so that the flow is slow, liquid membrane thickening, then reduce the heat transfer coefficient. Beijing refrigerant manufacturer hint according to the test, heat transfer surface is rough, serious can make the heat transfer coefficient by 20% - 30%. So, the heat transfer surface should be kept smooth and clean. 3, refrigerant vapor in the air or other no non-condensable gas in the refrigeration system, there are always some air and coolant and lubricant at high temperature decomposition of non-condensable gas, the non-condensable gas entering the condenser, the attached near the condensate film, the refrigerant vapor partial pressure to reduce, thus affecting the refrigerant vapor condensation heat, the heat transfer coefficient decreased significantly. * * take measures, therefore, to prevent air infiltration of the refrigeration system, and in a timely manner will not non-condensable gas discharge in the system. 4, refrigerant vapor containing lubricating oil when the refrigerant vapor containing lubricating oil, lubricating oil in oil film is formed on the heat transfer surface, increases the thermal resistance of thermal conductivity, reduces the heat transfer coefficient. Oil's influence on the condensation heat of refrigerant vapor, depends on the degree of lubricating oil in the refrigerant dissolved. For freon refrigeration system, when the oil concentration less than 6% ~ 7%, don't consider it's influence on the heat transfer, but more than this limit, coefficient of heat transfer would be reduced. Therefore, in the refrigeration equipment to set up the effective oil separation equipment, to reduce the oil content of refrigerants. 5, the structure of the condenser form the structure of the condenser, the heat transfer of refrigerant vapor side is also different. But no matter what form of condenser, Beijing refrigerant manufacturer suggested to improve the heat transfer coefficient, * * guarantee can quickly will eliminate condensation on the surface of the heat transfer liquid, and to ensure that the heat transfer surface is smooth and clean.

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