Keywords: second law analysis, entropy generation minimisation, exergy, heat exchangers, two-phase flow regimes, heat transfer, pressure drop modelling, fluid flow
Second law analysis of condenser by using new heat transfer and pressure drop model based on flow regimes
A new heat transfer and pressure drop model is used for second law analysis of condenser by considering three mainly occurring two phase flow regimes such as annular, stratified wavy and fully stratified flows. A single pass double pipe two phase heat exchanger is considered for the analysis with refrigerant R134a as two phase fluid. For each type of flow patterns, the behaviour of entropy generation number due to heat transfer and pressure drop were studied by varying different input parameters of two phase fluid flow such as diameter of two phase tube, mass velocity, difference between saturation and tube wall temperature, quality and saturation temperature.