Optimization of a construction of the compact heat exchanger with thermal stresses

The purpose of the present activity was analytical investigation of heat transfer and state of stress in primary heat exchanger 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 thermal stresses 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 known activities: 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 range -50-100 °C. In an heat channel input temperature was set in range 400-500 °C. The major factors contributing to drop of thermal stresses 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 lowering temperature stresses in the heat exchanger are obtained. The obtained outcomes allow to prolong resource of activity of heat exchangers of the given type working in heat-stressed conditions.