Abstract
This article presents the results of experimental research of heat transfer coefficient in air cooled vertical pipe minichannels during R404A, R407C and R410A high-pressure refrigerants condensation. The study determined local and average heat transfer coefficient values in full range of vapour quality, x = 0 ÷ 1. On the basis of experimental investigations, the dependence of heat transfer on the vapour quality x, mass flux density G and minichannel's internal diameter dw was obtained.
Highlights
The dynamic expansion in global development forces the unceasing need for innovative solutions in design and construction of equipment. These solutions aim at intensifying utility parameters such as power, efficiency and reducing their size while lowering production costs [1]
The results showed that the local condensation heat transfer coefficient increases with increasing mass flux and decreases with decreasing local vapor quality
Thermo-flow parameters were measured at mass flux density G = 400, 600 and 800 kg·m-2·s-1 and the full range of refrigerant's vapor quality x
Summary
The dynamic expansion in global development forces the unceasing need for innovative solutions in design and construction of equipment. Authors fabricated a new experimental apparatus in order to obtain explicit local condensation heat transfer coefficient measurements over a range of test conditions. The effects of vapour quality, mass fluxes, channel geometry, and saturation temperature on the heat transfer coefficient have been clarified and analyzed. An experimental investigation was carried out in paper [20] for the benefit of refrigerant mass flux, local vapor quality, coolant flow rate and inlet coolant temperature on the local condensation heat transfer coefficient. The results showed that the local condensation heat transfer coefficient increases with increasing mass flux and decreases with decreasing local vapor quality. Thermo-flow parameters were measured at mass flux density G = 400, 600 and 800 kg·m-2·s-1 and the full range of refrigerant's vapor quality x. For the heat transfer coefficient, the best agreement was for authors [6,7,8,9] data
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