Research on Refrigerant Distribution and Heat Transfer Performance of Dry Evaporator
A coupled heat transfer model for a dry evaporator was established,and the flow distribution of R410A and water were simulated.The refrigerant distribution and flow heat transfer performance inside evaporator were studied by calculating the relative standard deviation STD of branch pipes.The results show that an equalizing plate can significantly reduce the uneven flow rate distribution of refrigerant in the tube and lower the outlet temperature of the refrigerant carrier.The heat transfer of branch pipe is affected by heat transfer coefficient inside and outside the pipe.The heat transfer coefficient distribution on pipe side is consistent with the refrigerant flow distribution characteristics.While the heat transfer coefficient on the shell side is mainly affected by working conditions and shell side structure.The optimal flow equalizing plate scheme can reduce refrigerant unevenness by 72.0％,the total heat exchange increased simultaneously by 37.4％.
Dry EvaporatorUnevennessHeat Transfer PerformanceNumerical Simulation
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