Condensation of R-22 in Horizontal Smooth Tubes: Flow Pattern-Based Heat Transfer and Pressure Drop Correlations - Brossura

Christians, Marcel

Brossura

ISBN 10: 3639130669 ISBN 13: 9783639130669

Casa editrice: VDM Verlag Dr. Müller, 2009

Riassunto

The phase-out of ozone-depleting refrigerants, such as R-12 and R-22, according to the Montreal Protocol of 1987, has provided the incentive to increase the thermal efficiency of current heating and refrigeration systems. The purpose of this study was to increase the accuracy of the predictions of both the heat transfer and pressure drop correlations for condensing refrigerants in the Intermittent flow regime. This was done utilizing a novel method involving the temporal and spectral analysis of the light intensity of the local flow regime, as seen through a sight glass. An experimental setup was designed, built and commissioned specifically for this purpose using refrigerant R-22 and a smooth tube. It was found that the accuracy of the mean heat transfer coefficient predictions increased substantially compared to other leading correlations, particularly at low mass fluxes. In terms of the pressure drop, the predictions also increased in accuracy, and it was found that the time fraction method allows for continuous predictions over flow regime transitions when using local flow pattern-based pressure drop models.

Su questo libro

L'autore

Marcel Christians received his B.Eng., B.Eng.(Hons) and M.Eng. degrees in Mechanical Engineering (cum laude) at the University of Pretoria in Pretoria, South Africa. He is currently employed at the Laboratory of Heat and Mass Transfer, at the Swiss Federal Institute of Technology in Lausanne, Switzerland.

Dettagli dell'edizione

• Editore: VDM Verlag Dr. Müller
• Data di pubblicazione: 2009
• Lingua: Inglese
• ISBN 10: 3639130669
• ISBN 13: 9783639130669
• Rilegatura: Copertina flessibile
• Numero di pagine: 248
• Contatto del produttore: non disponibile
• Persona responsabile: non disponibile