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Experimental analysis of local condensation and evaporation heat transfer of zeotropic mixture in a plate heat exchanger.

Number: 2224

Author(s) : HASAN A., MIYARA A.

Summary

Plate Heat Exchangers (PHEs) are gaining popularity as condensers and evaporators for their compact design and high efficiency. The demand of PHEs for air-to-water heat pumps has increased significantly in recent years. Enhancing the efficiency of the PHEs is crucial to save energy usage and reduce carbon emissions. To achieve this improvement, gathering data on the local heat transfer characteristics is essential since uneven fluid distribution in channels poses a challenge to effective heat transfer. In addition, there has been a noticeable surge in the need for refrigerants with low Global Warming Potential (GWP), due to the limited availability of pure low GWP refrigerants, which are insufficient to meet all applications, various blends of refrigerants have been suggested such as R454B, R454C, R455A, and others. However, there is currently no available data on the local heat transfer characteristics of these refrigerant mixtures. Existing literature lacks experimental analysis of local heat transfer coefficients for pure and zeotropic mixture refrigerants in plate heat exchangers. In this study, a specially constructed test section was used in the conducted inquiry to measure the local heat transfer coefficient of refrigerants. This study experimentally analyzed the three-component zeotropic mixture R455A's local heat transfer at various conditions. The local distribution of heat transfer coefficients is essential for both condensation and evaporation. This information aids in establishing a connection between the heat transfer coefficient and the flow regime, allowing for a more accurate correlation for predicting heat transfer. This, in turn, facilitates enhancements in the design of heat exchangers, leading to improved heat transfer performance.

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  • Original title: Experimental analysis of local condensation and evaporation heat transfer of zeotropic mixture in a plate heat exchanger.
  • Record ID : 30033092
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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