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**Harvard**

Karlsson, T. och Vamling, L. (2004) *Reasons for drop in shell-and-tube condenser performance when replacing R22 with zeotropic mixtures. Part 2: investigation of mass transfer resistance effects *.

** BibTeX **

@article{

Karlsson2004,

author={Karlsson, Tord and Vamling, Lennart},

title={Reasons for drop in shell-and-tube condenser performance when replacing R22 with zeotropic mixtures. Part 2: investigation of mass transfer resistance effects },

journal={Journal of Refrigeration},

volume={27},

issue={5},

pages={561-566},

abstract={Detailed calculations of condensation outside a column of horizontal smooth tubes have been carried out in order to investigate the influence of mass transfer resistance for a zeotropic refrigerant mixture. Diffusive transport is calculated locally in both phases. Calculation results show that mass transfer resistance in the gas phase reduces heat transfer by 1020% for a binary mixture with a glide similar to that of R407C.
The decrease in heat transfer due to poor mixing in the condensate is from 15 to 65% for the conditions investigated; the lower the duty, the greater the decrease. Results show that if assuming mixing in the condensate by diffusion only, the degrees of mixing and the duty dependency are similar to results in earlier work where calculations were matched to experimental data. Diffusion is likely to be the dominant mixing mechanism in the condensate, and the mixing is poor under certain conditions, which might explain the drop in condenser performance for some heat pump applications.},

year={2004},

keywords={Condensation; R22; R407C; Shell-and-tube exchanger; Experiment; Measurement; Heat transfer; Mass transfer; Parameter; Tube },

}

** RefWorks **

RT Journal Article

SR Electronic

ID 1190

A1 Karlsson, Tord

A1 Vamling, Lennart

T1 Reasons for drop in shell-and-tube condenser performance when replacing R22 with zeotropic mixtures. Part 2: investigation of mass transfer resistance effects

YR 2004

JF Journal of Refrigeration

VO 27

IS 5

SP 561

OP 566

AB Detailed calculations of condensation outside a column of horizontal smooth tubes have been carried out in order to investigate the influence of mass transfer resistance for a zeotropic refrigerant mixture. Diffusive transport is calculated locally in both phases. Calculation results show that mass transfer resistance in the gas phase reduces heat transfer by 1020% for a binary mixture with a glide similar to that of R407C.
The decrease in heat transfer due to poor mixing in the condensate is from 15 to 65% for the conditions investigated; the lower the duty, the greater the decrease. Results show that if assuming mixing in the condensate by diffusion only, the degrees of mixing and the duty dependency are similar to results in earlier work where calculations were matched to experimental data. Diffusion is likely to be the dominant mixing mechanism in the condensate, and the mixing is poor under certain conditions, which might explain the drop in condenser performance for some heat pump applications.

LA eng

LK http://dx.doi.org/10.1016/j.ijrefrig.2004.03.012

OL 30