Reason for drop in shell-and-tube condenser performance when replacing R22 with zeotropic mixtures. Part 1. Analysis of experimental findings
Artikel i vetenskaplig tidskrift, 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

Författare

Dave Sajjan

Chalmers, Institutionen för kemiteknik och miljövetenskap, Värmeteknik och maskinlära

Tord Karlsson

Chalmers, Institutionen för kemiteknik och miljövetenskap, Värmeteknik och maskinlära

Lennart Vamling

Chalmers, Institutionen för kemiteknik och miljövetenskap, Värmeteknik och maskinlära

Journal of Refrigeration

Vol. 27 552-560

Ämneskategorier

Kemi