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Experimental analysis of high temperature flow boiling of zeotropic mixture R134a/R245fa in a plate heat exchanger by Xiaohui Huang; Ji Zhang; Fredrik Haglind is a Engineering article available to read on EtoBox.

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The potential to improve the performance of organic Rankine cycle systems by using zeotropic mixtures as working fluids has been demonstrated in the open literature. However, there are very few research works in the open literature studying the mixture flow boiling in plate heat exchangers, and none of the existing works address high temperature boiling, which is the prevailing working condition in the evaporator of organic Rankine cycle systems. This paper presents an experimental study of high temperature flow boiling of zeotropic mixtures of R134a/R245fa in a plate heat exchanger. Five compositions were tested at the reduced pressures 0.45, 0.55 and 0.65 and various heat fluxes and mass fluxes. In addition, the predictive performance of several existing prediction methods for the heat transfer coefficient and pressure drop were evaluated, and based on the results, new heat transfer and pressure drop prediction methods were developed. The experimental results suggest that the heat transfer is dominated by the nucleate boiling. The mixture having a 0.427/0.573 mass composition presents the largest heat transfer degradation, up to 42 %, compared with the pure fluids. As far as the

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Author

Xiaohui Huang; Ji Zhang; Fredrik Haglind

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)