Experimental Determination of Forced Convection Evaporative Heat Transfer Coefficients for Nonazeotropic Refrigerant Mixtures.
Experimental Determination of Forced Convection
Evaporative Heat Transfer Coefficients for Nonazeotropic
Radermacher, R.; Ross, H.; Didion, D. A.
Winter Annual Meeting, 1983. American Society of
Mechanical Engineers (ASME). November 1983, 1983.
refrigerants; forced convection; heat transfer;
mixtures; experiments; conservation; heating; data
A number of experiments were conducted in the 1960's to
determine the two phase heat transfer coefficient of
pure refrigerants. Recently energy conservation
requirements spurred interest in nonazeotropic
refrigerant mixtures, because such mixtures can improve
theoretically the COP of certain refrigerant cycles. The
two phase heat transfer coefficient of such mixtures
under forced convection conditions is virtually unknown.
An experimental rig has been constructed to investigate
where it is possible to predict the heat transfer
coefficient of the mixture based on the coefficients of
the components. Initially data was taken on R-22 and
compared to literature data and to existing predictive
correlations. Good agreement was found with the
literature's data on forced convection, single phase
heat transfer correlations, and some to two phase
evaporative correlations. Single phase,heating and two
phase boiling experiments were conducted then on R22 and
R22 individual and in various mixture concentrations.
The results of these tests are reported in the paper.