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CONDENSATION HEAT TRANSFER COEFFICIENT AND PRESSURE DROP OF R12 AND ITS SUBSTITUTE R134A WERE MEASURED INSIDE A HORIZONTAL SMOOTH TUBE. THE LOCAL HEAT TRANSFER COEFFICIENT OF R134A IS ABOUT 20% HIGHER THAN THAT OF R12 AT THE SAME SATURATION TEMPERATURE, MASS VELOCITY, VAPOR QUALITY AND HEAT FLUX. THE LOCAL NUSSELT NUMBER OF BOTH REFRIGERANTS IS WELL CORRA. THE FRICTIONAL PRESSURE DROP OF R134A IS ABOUT 30% LOWER THAN THE LOCKHART-MARTINELLI CORRELATION CURVE. THEREFORE, R134A IS ADEQUATE AS A SUBSTITUTE OF R12 FROM THE STANDPOINT OF THE CONDENSATION HEAT TRANSFER.
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Details
- Original title: CONDENSATION OF CFC-12 AND ITS SUBSTITUTE HFC-134A INSIDE A HORIZONTAL SMOOTH TUBE.
- Record ID : 1992-2143
- Languages: English
- Source: New challenges in refrigeration. Proceedings of the XVIIIth International Congress of Refrigeration, August 10-17, 1991, Montreal, Quebec, Canada.
- Publication date: 1991/08/10
- Document available for consultation in the library of the IIR headquarters only.
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Indexing
- Themes: Mass transfer
- Keywords: R134a; Horizontal tube; Heat transfer coefficient; Mass transfer; Heat transfer; Bare pipe; R12; Substitute; Refrigerant; Condensation; Pressure drop
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