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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
Condensation of R-22 in Horizontal Smooth Tubes

Condensation of R-22 in Horizontal Smooth Tubes

Christians, Marcel

Paperback

Technology & Engineering

ISBN10: 3639130669
ISBN13: 9783639130669
Publisher: Blues Kids Of Amer
Published: Mar 4 2009
Pages: 248
Weight: 0.81
Height: 0.56 Width: 6.00 Depth: 9.00
Language: English
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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