Ye Jinting Li Qingpu Zhang Chen Chen Weijian Jiang Bo Zhu Ting.R134a Flow-Condensation Heat Transfer in Horizontal Micro-Fin Tube[J].Journal of Refrigeration,
Ye Jinting Li Qingpu Zhang Chen Chen Weijian Jiang Bo Zhu Ting.R134a Flow-Condensation Heat Transfer in Horizontal Micro-Fin Tube[J].Journal of Refrigeration,DOI:10.12465/issn.0253-4339.20251123002.
R134a Flow-Condensation Heat Transfer in Horizontal Micro-Fin Tube
To promote the development of high-efficiency tubular condensation heat exchangers, we studied R134a flow-condensation heat transfer characteristics in six micro-fin tubes with different structures, evaluated the prediction performance of four correlations (Koyama et al., Miyara et al., Cavallini et al., and Oliver et al.), and explored the influence mechanisms of experimental conditions and tube structural parameters. The results show that the R134a heat transfer coefficient increases with the increase of mass flux (500~1 100 kg/(m²·s)) and the decrease of condensation temperature (35~45 ℃); the Koyama et al.'s correlation exhibits the best prediction concentration (deviation range of -43.6% to -27.4%), the Cavallini et al.'s correlation has the optimal overall prediction performance but poor concentration, the Miyara et al.'s correlation overestimates (deviation range of 21.3%~56.4%), and the Oliver et al.'s correlation underestimates (deviation range of -31.4% to -52.5%) the heat transfer characteristics. Therefore, based on the prediction performance of the Koyama et al.'s correlation for the flow-condensation heat transfer characteristics in micro-fin tubes, the dimensionless variable characterizing the fluid turbulence in the model was redefined. The obtained model can accurately predict R134a flow-condensation heat transfer characteristics in 1# (14.6%) & 2# (-11.0%) & 3# (4.9%) & 4# (-12.0%) & 5# (8.4%) & 6# (2.7%) micro-fin tubes. The average prediction deviation, which ranges from -12.0% to 14.6%, sufficiently validates practical values provided by the model developed.
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