Optimization of the heat exchanger of an air conditioning system

摘要

The purpose of the present activity was investigation of heat transfer in heat exchanger (condensator) of air conditioning systems. For this purpose the two dimensional model of calculation of heat transfer in the heat exchanger (cross-precise compact plate-ribbed) is designed. As a result of calculations the two dimensional fields of temperatures of a heat-transport surface received, ground which one the zones of an icing in a design were calculated. The model allows for features of heat rejection on initial segments of channels. The veracity of model is tested by matching predicted data with experiments: the qualitative and quantitative consent is obtained. The numerical research is executed in a broad band of parameters. Input temperature of scavenging air was set in the range -50...0/spl deg/C. In a heat channel input temperature was set in the range 20...60/spl deg/C. The major factors contributing to drop of zones of an icing in the heat exchanger are established. As a result of optimization of parameters of a finning the versions of a design of heat exchangers with favourable reallocating of temperatures of a heat-transport surface in the heat exchanger are obtained. The obtained outcomes allow to prolong resource of activity of heat exchangers of the given type working on two-phase heat carriers at negative temperatures.