Experimental evaluation reveals improved heat transfer in R-600a condensation over copper coated tubes, suggesting benefits for HVAC applications.
In this study, heat transfer characteristics of vapor condensation of R-600a over horizontal copper coated tubes were evaluated experimentally at saturated temperature of 40, wall sub-cooling temperatures of 4-18 and heat flux of 32-176 kW/m2. The present study emphasized on surface modification through coating so that dropwise condensation could be promoted and condensate could be easily drained out from the tube surface. Also, this study investigated the omniphobic behavior of different coating parameters by comparing their heat transfer characteristics. The effect of different operating parameters on required outcomes were analyzed and represented through different graphs. Results were validated through modified Wilson plot method which underpredicted heat transfer coefficient by 11.9 to 26.8 %.
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Sajjan et al. (2025) studied this question.
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