Theoretical and experimental thermodynamic analyses of a chevron type heat exchanger

In this study, the theoretical results of energy and exergy analyses of the chevron type heat exchanger are compared with experimental ones. A test ring is set up and water is used as working fluid. While mass flow rate of hot water was kept constant as 0.083kgs−1, the mass flow rate of cold water varies from 0.027kgs−1 to 0.083kgs−1, the hot water temperature from 35 to 60°C, cold water temperature from 21 to 25.35°C in the experiments. The energy efficiency increases linearly with respect to hot water inlet temperature at the cold water mass flow rate values, however, in exergy efficiency, the optimum conditions comes out. Energy efficiency of the chevron type heat exchanger has the theoretical and experimental values ranging from 45% to 78%. When it comes to the exergy efficiency of the chevron type, the heat exchanger has the theoretical values ranging from 16% to 39.5% and experimental values from 13% to 47.8%. It is found that the theoretical results have a good agreement with the experimental ones.