4010 -- The Effect of R134a Inundation on Enhanced Tube Geometries PDF

Data showing the effect of refrigerant R134a condensate inundation on the shell-side heat transfer coefficient are presented for four enhanced tube geometries. The test bundle consists of five instrumented tubes in a five-row test bundle surrounded by inactive tubes in a staggered tube arrangement with a horizontal pitch of 22.2mm (0.875in.) and a vertical pitch of 19.1mm (0.75in.). Simulations of the effect of inundation up to a depth of 30 rows are presented. The data were obtained at a saturation temperature of 35degC (95degF) at heat fluxes of approximately 27,000 and 55,000W/m2 (8,560 and 17,400Btu/[h.ft2 ) on 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.

KEYWORDS: year 1996, refrigerants, R134a, condensate, finned tubes, heat transfer coefficient, performance, heat flow, testing, calculating