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The Condensation Pressure Drop of R-22 and R-410A in Small Diameter Tube  

Son, Chang-Hyo (School of Mechanical Engineering, Pukyong National University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.19, no.2, 2008 , pp. 156-162 More about this Journal
Abstract
The condensation pressure drop for R-22 and R-410A flowing in a small diameter tube was investigated. The test section is a counterflow heat exchanger with refrigerant flowing in the inner tube and coolant flowing in the annulus. The test section consists of 1220 mm length with horizontal copper tube of 3.38 mm outer diameter and 1.77 mm inner diameter. The refrigerant mass fluxes ranged from 450 to $1050\;kg/m^2{\cdot}s$ and the average inlet and outlet qualities were 0.05 and 0.95, respectively. The main experimental results were summarized as follows : In the case of two-phase flow, the pressure drop increases with increasing mass flux and decreasing quality. The pressure drop of R-22 is slightly higher than that of R-410A for the same mass flux. Most of correlations proposed in the large diameter tube showed enormous deviations with experimental data.
Keywords
Evaporation; Heat transfer coefficient; Supercritical cycle;
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