Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Flow Boiling and Pressure Drop Measurements for R-134a/Oil Mixtures Part 2: Evaporation in a Plain Tube
Intube flow boiling experiments for refrigerant R-134a mixed with a lubricating oil are reported for a plain, horizontal tube. The tests were run at a nominal inlet pressure of 340 kPa over a wide range of vapor qualities at mass velocities of 100, 200, and 300 kg/(s·m2) (73,500, 147,000, and 220,500 lb/h·ft2) for inlet oil concentrations from 0 to 5 mass % oil. At low to intermediate vapor qualities (0.2 < x < 0.60), the oil tended to increase the local boiling coefficient, while significant deterioration in boiling performance occurred at high vapor qualities for the higher concentrations. As opposed to similar tests with a microfin tube, no evidence of oil holdup inside the plain tube test sections was noted. However, the effect of flow pattern appears to be important; the effect of local physical properties on the heat transfer coefficient at high vapor qualities was confirmed.
Flow Boiling and Pressure Drop Measurements for R-134a/Oil Mixtures Part 2: Evaporation in a Plain Tube
Intube flow boiling experiments for refrigerant R-134a mixed with a lubricating oil are reported for a plain, horizontal tube. The tests were run at a nominal inlet pressure of 340 kPa over a wide range of vapor qualities at mass velocities of 100, 200, and 300 kg/(s·m2) (73,500, 147,000, and 220,500 lb/h·ft2) for inlet oil concentrations from 0 to 5 mass % oil. At low to intermediate vapor qualities (0.2 < x < 0.60), the oil tended to increase the local boiling coefficient, while significant deterioration in boiling performance occurred at high vapor qualities for the higher concentrations. As opposed to similar tests with a microfin tube, no evidence of oil holdup inside the plain tube test sections was noted. However, the effect of flow pattern appears to be important; the effect of local physical properties on the heat transfer coefficient at high vapor qualities was confirmed.
Flow Boiling and Pressure Drop Measurements for R-134a/Oil Mixtures Part 2: Evaporation in a Plain Tube
Zürcher, Olivier (Autor:in) / Thome, John R. (Autor:in) / Favrat, Daniel (Autor:in)
HVAC&R Research ; 3 ; 54-64
01.01.1997
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
| British Library Conference Proceedings | 1997
| British Library Online Contents | 1997
| British Library Online Contents | 1997
| British Library Conference Proceedings | 1997
| Taylor & Francis Verlag | 1997