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Evaporation and Condensation Heat Transfer Performance of Flammable Refrigerants in Brazed Plate Heat Exchangers

Published

Author(s)

Mark A. Kedzierski, J C. Chato, T J. Rabas

Abstract

Measured overall Nusselt numbers were determined for R22, R290, R290/600a, and R32/152a undergoing evaporation and condensation in a brazed plate heat exchanger. The refrigerants experienced wavy, stratified flow at low heat and mass fluxes, 1.3 to 8.3 kW/m2 and 1.6 to 19 kg/m2 s, respectively. Heat transfer correlations from the literature for in-tube and channel flow of refrigerants with similar heat and mass fluxes were compared to the measured Nusselt numbers and found unsatisfactory. Evaporation and condensation correlations were developed from the data for this study for the combined data of R22, R290, and R290/600a and the data for R32/152a. Separate correlations were needed because the lubricant used for R32/152a is different than the lubricant used for the other refrigerants.
Citation
NIST Interagency/Internal Report (NISTIR) - 6541
Report Number
6541
Volume
10

Keywords

brazed plate heat exchanger, condensation, evaporation, flammable refrigerants, refrigerant mixtures

Citation

Kedzierski, M. , Chato, J. and Rabas, T. (2000), Evaporation and Condensation Heat Transfer Performance of Flammable Refrigerants in Brazed Plate Heat Exchangers, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD (Accessed April 24, 2024)
Created July 1, 2000, Updated February 19, 2017