Reason for drop in shell-and-tube condenser performance when replacing R22 with zeotropic mixtures. Part 1. Analysis of experimental findings
Journal article, 2004

An experimental and theoretical investigation was made to find out the reasons for the drop in shell-and-tube condenser performance when replacing R22 with a zeotropic mixture R407C. Measurements show that at lower condenser loads the reduction in performance can be as large as 70% compared to the full condenser load. Calculation results are compared with experimental results for two different condensers, one with micro-finned tubes and one with 3-D finned tubes. Calculations show that the degree of mixing of the newly formed condensate on a tube and the drained condensate is a factor influential enough to explain the performance drop. 3-D finned tubes seem to have better mixing in the condensate than integral finned tubes.

Shell-and-tube exchanger

R22

Heat transfer

Measurement

Experiment

Tube

Condensation

R407C

Parameter

Mass transfer

Author

Dave Sajjan

Chalmers, Department of Chemical Engineering and Environmental Sciences, Heat and Power Technology

Tord Karlsson

Chalmers, Department of Chemical Engineering and Environmental Sciences, Heat and Power Technology

Lennart Vamling

Chalmers, Department of Chemical Engineering and Environmental Sciences, Heat and Power Technology

Journal of Refrigeration

Vol. 27 5 552-560

Subject Categories

Chemical Sciences

More information

Created

10/7/2017