Shell-side condensation heat transfer of R-134a. Part 3: Comparison with R-12
- Iowa State Univ., Ames, IA (United States). Dept. of Mechanical Engineering
Shell-side condensation heat transfer coefficient data are compared for refrigerants R-134a and R-12 on tube bundles constructed from two finned-tube geometries and two enhanced-tube geometries. The tube bundles tested are five rows wide by five rows deep and have a staggered tube arrangement with a horizontal pitch of 22.2 mm (0.875 in.) and it vertical pitch of 19.1 mm (0.75 in.). The data were obtained at a refrigerant saturation temperature of 35 C (95 F) over a bundle heat flux range of 18,000 to 40,000 W/m{sup 2} (5,700 to 12,700 Btu/[h {center_dot} ft{sup 2}]). Average condensing heat transfer coefficients for the bundle as well as the middle tube of each row were calculated. The data show that R-134a performs better than R-12 on all four tube geometries. The data also show that for a given tube bundle, the row-to-row behavior of both refrigerants is similar.
- OSTI ID:
- 33252
- Report Number(s):
- CONF-9406105--
- Country of Publication:
- United States
- Language:
- English
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