Comparative performance analysis of concentric-tube-type heat exchanger at various operating conditions with copper and aluminium tube materials

摘要

Concentric-tube-type heat exchanger is selected as a thermodynamic system for this research work. Different materials (copper and aluminium) are used for tube of heat exchanger. Entropy generation, exergy destruction, entransy and entransy-based thermal resistance are evaluated at different mass flow rates/inlet temperatures/specific heats of working fluids (hot/cold fluids). In addition, different tube materials and various outer/inner tube diameters of heat exchanger are also taken as parameters. And then combined effects of all these parameters are analysed. Finally, performance characteristic charts are generated. Analyses are done for counter flow heat exchanger as well as for parallel flow heat exchanger. Computer software is developed and all these analyses are done using prepared computer software. These evaluations are important to identify those operating conditions at which the heat exchanger's performance is best and optimised.