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

Christians, Marcel

 
9783639130669: Condensation of R-22 in Horizontal Smooth Tubes: Flow Pattern-Based Heat Transfer and Pressure Drop Correlations
Tapa blanda
ISBN 10: 3639130669 ISBN 13: 9783639130669
Editorial: VDM Verlag Dr. Müller, 2009

Sinopsis

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.

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Reseña del editor

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.

Biografía del autor

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.

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Editorial
VDM Verlag Dr. Müller
Año de publicación
2009
Idioma
Inglés
ISBN 10 
3639130669
ISBN 13 
9783639130669
Encuadernación
Tapa blanda
Número de páginas
248
Contacto del fabricante
no disponible
Persona responsable
no disponible