Abstract
In this paper, exergy effectiveness is defined to describe the thermodynamic performance of three-fluid heat exchangers with three thermal communications. It is systemically discussed that the effects of eight non-dimensional design parameters, which include the ratio of the thermal resistances between fluids, the ratio of thermal capacity between fluids, the number of transfer units, the dimensionless inlet temperature of fluid, and the ratio of the inlet temperature of fluids on exergy effectiveness of three-fluid heat exchangers. Furthermore, the exergy effectiveness of the parallel flow is compared with that of the counter flow. The obtained results are helpful for engineers to evaluate and improve the performances of three-fluid heat exchangers.
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