4024 (RP-676) -- The Effect of Noncondensable Gas on the Condensation of R-123 on Enhanced Tube Geometries ✓ Most Recent

Data showing the effect of several concentrations of non-condensable gas on the condensation of R123 (scheduled non-CFC replacement for R11) are presented for bundles of four enhanced tube geometries - a 1,024-fpm (26-fpi) tube; a low-fin, 1,475-fpm (40-fpi) tube; and two enhanced tubes, designated the Tu-Cii and the G-SC. The test bundles are five columns wide by five-rows deep in a staggered tube arrangement with a 22.2-mm (0.875-in) horizontal pitch and a 19.1-mm (0.75-in) vertical pitch. Tests for the effect of noncondensable gases were conducted at four concentrations of nitrogen by volume - 0.5%, 1.0%, 2.0%, and 5.0%, at four heat fluxes between 18,000 W/m2 (5,700 Btu/h.ft2) and 34,000 W/m2 (10,780 Btu/h.ft2). All the data were obtained at a saturation temperature of 35degC (95degF).

KEYWORDS: year 1997, Condensation, refrigerants, R123, heat transfer coefficient, nitrogen dioxide, comparing, finned tubes, heat flow, testing, measuring, experiment, performance, fluorocarbons