Topic
Subcooling
About: Subcooling is a research topic. Over the lifetime, 6150 publications have been published within this topic receiving 99125 citations.
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TL;DR: In this article, condensation heat transfer coefficients (HTCs) were measured on a horizontal plain tube, low fin tube, and Turbo-C tube at the saturated vapor temperature of 39°C for R22, R407C, and R410A with the wall subcooling of 3-8°C.
Abstract: In this study, condensation heat transfer coefficients (HTCs) were measured on a horizontal plain tube, low fin tube, and Turbo-C tube at the saturated vapor temperature of 39 °C for R22, R407C, and R410A with the wall subcooling of 3–8 °C. R407C, a non-azeotropic refrigerant mixture, exhibited a quite different condensation phenomenon from those of R22 and R410A and its condensation HTCs were up to 50% lower than those of R22. For R407C, as the wall subcooling increased, condensation HTCs decreased on a plain tube while they increased on both low fin and turbo-C tubes. This was due to the lessening effect of the vapor diffusion film with a rapid increase in condensation rate on enhanced tubes. On the other hand, condensation HTCs of R410A, almost an azeotrope, were similar to those of R22. For all refrigerants tested, condensation HTCs of turbo-C tube were the highest among the tubes tested showing a 3–8 times increase as compared to those of a plain tube.
55 citations
TL;DR: In this paper, the heat transfer coefficient (HTC) during condensation of HFC-134a and R-404A in a smooth (8.56mm ID) and micro-fin tubes were experimentally investigated.
55 citations
TL;DR: In this paper, a microgrooved surfaces with reentrant cavities (MSRCs) were fabricated on pure copper substrates by employing the orthogonal ploughing/extrusion (P/E) method.
55 citations
TL;DR: In this paper, a new model for upward vertical subcooled flow boiling at low pressure has been proposed, which considers the most relevant closure relationships of one-dimensional thermal-hydraulic codes that are important for accurate prediction of vapour contents.
55 citations
TL;DR: In this article, a numerical model of simultaneous mass and heat transfers between the liquid and gas phases in the jet ejector was developed, and the steady-state model was based on unidimensional balance equations of mass, energy and momentum.
55 citations