Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Convective Vaporization Data for Pure Refrigerants in Tube Banks Part II: Enhanced Tubes
Convective vaporization data were obtained for two different enhanced tube geometries in a staggered tube bank made of 18.9 mm (0.75 inch) outside diameter tubes having an equilateral pitch-to-diameter ratio of 1.25. Data are presented for pure refrigerants R-11, R-123, and R-134a at saturation temperatures of 4.4°C (40°F) and 26.7°C (80°F). The data span vapor qualities of 0.0 to 0.9, mass velocities (based on minimum flow cross section area) of 10 to 30 kg/(m2· s) (7,400 to 22,000 lb/h·ft2), and heat fluxes of 15 to 45 kW/m2 (4,760 to 14,300 Btu/h·ft2). The apparatus allowed independent control of vapor quality, mass velocity, and heat flux. The data were correlated in the form of an asymptotic model with a root mean squared error of less than 15%. A modified superposition model with a suppression factor of unity correlated all the Tu-B (R-11 and R-123) data and approximately 90% of the W-SE (R-134a) data within ±20%. The experimental results for the two enhanced tube geometries tested show that the tube bundle performance is reasonably predicted by the nucleate pool boiling data at the same saturation temperature and heat flux.
Convective Vaporization Data for Pure Refrigerants in Tube Banks Part II: Enhanced Tubes
Convective vaporization data were obtained for two different enhanced tube geometries in a staggered tube bank made of 18.9 mm (0.75 inch) outside diameter tubes having an equilateral pitch-to-diameter ratio of 1.25. Data are presented for pure refrigerants R-11, R-123, and R-134a at saturation temperatures of 4.4°C (40°F) and 26.7°C (80°F). The data span vapor qualities of 0.0 to 0.9, mass velocities (based on minimum flow cross section area) of 10 to 30 kg/(m2· s) (7,400 to 22,000 lb/h·ft2), and heat fluxes of 15 to 45 kW/m2 (4,760 to 14,300 Btu/h·ft2). The apparatus allowed independent control of vapor quality, mass velocity, and heat flux. The data were correlated in the form of an asymptotic model with a root mean squared error of less than 15%. A modified superposition model with a suppression factor of unity correlated all the Tu-B (R-11 and R-123) data and approximately 90% of the W-SE (R-134a) data within ±20%. The experimental results for the two enhanced tube geometries tested show that the tube bundle performance is reasonably predicted by the nucleate pool boiling data at the same saturation temperature and heat flux.
Convective Vaporization Data for Pure Refrigerants in Tube Banks Part II: Enhanced Tubes
Gupte, Neelkanth S. (Autor:in) / Webb, Ralph L. (Autor:in)
HVAC&R Research ; 1 ; 48-60
01.01.1995
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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