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<p>Plate heat exchangers (PHE) are increasingly adopted as evaporators in refrigeration systems due to their compactness, high heat transfer efficiency, and reduced refrigerant charges lead to a critical advantage for environmentally sustainable systems using low-global-warming-potential refrigerants. However, refrigerant flow maldistribution within PHEs can degrade thermal performance, often necessitating oversized designs that counteract their inherent refrigerant minimization benefits. This study experimentally investigates the quasi local heat transfer coefficient distribution in a PHE evaporator, revealing asymmetric and non-uniform profiles under operational conditions. Two correlations were developed: a physics-based approach and a data-driven symbolic regression technique implemented in Python. Both approaches produced correlations predicting HTC with high accuracy, demonstrating a mean absolute percentage deviation of approximately 7% against experimental data.</p>

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Experimental analysis of quasi local evaporation heat transfer coefficient of zeotropic mixture R455A

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Afnan Hasan,
  • Ikramul Hasib,
  • Akio Miyara

摘要

Plate heat exchangers (PHE) are increasingly adopted as evaporators in refrigeration systems due to their compactness, high heat transfer efficiency, and reduced refrigerant charges lead to a critical advantage for environmentally sustainable systems using low-global-warming-potential refrigerants. However, refrigerant flow maldistribution within PHEs can degrade thermal performance, often necessitating oversized designs that counteract their inherent refrigerant minimization benefits. This study experimentally investigates the quasi local heat transfer coefficient distribution in a PHE evaporator, revealing asymmetric and non-uniform profiles under operational conditions. Two correlations were developed: a physics-based approach and a data-driven symbolic regression technique implemented in Python. Both approaches produced correlations predicting HTC with high accuracy, demonstrating a mean absolute percentage deviation of approximately 7% against experimental data.