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IIR document

Experimental and analytical investigation of CO₂/R32 condensation heat transfer in a microchannel.

Author(s) : WANG P., LI M., DAI B., WANG Q., MA Y., DANG C., TIAN H.

Type of article: IJR article

Summary

Previous research has shown that CO₂ mixtures can improve the thermal performance of CO₂ refrigeration systems. Moreover, the use of a microchannel heat exchanger can reduce the refrigerant charge and improve the heat transfer coefficient. Therefore, in this experimental study, we investigated the condensation heat transfer characteristics of CO₂/R32 in a porous flat microchannel with a hydraulic diameter of 0.715 mm. According to the results, the convective heat transfer coefficient decreased rapidly then increased slowly with an increase in the CO₂ mass fraction. The minimum value was achieved when the CO₂ mass fraction was approximately 55%. In addition, the convective heat transfer coefficient decreased with an increase in the condensation temperature. Higher vapour quality and mass flow rate conditions corresponded to higher convective heat transfer coefficients. The prediction correlations applicable to the in-tube condensation heat transfer exhibited low prediction results for CO₂/R32, with a heat transfer coefficient prediction error for the newly established prediction model of 16.77%. This study provides theoretical support for analysis of the CO₂/R32 condensation heat transfer mechanism in microchannels and the future design of microchannel condensers.

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Pages: 338-352

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Details

Original title: Experimental and analytical investigation of CO₂/R32 condensation heat transfer in a microchannel.
Record ID : 30030821
Languages: English
Subject: Technology
Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 145
Publication date: 2023/01
DOI: http://dx.doi.org/10.1016/j.ijrefrig.2022.08.023

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Indexing

Themes: Evaporators, condensers and other heat exchangers;
Heat transfer;
CO2
Keywords: Microchannel; Expérimentation; Mixture; R32; R744; Heat transfer; Condensation