Development of a Correlation for Predicting Condensation
Heat Transfer Coefficients for Refrigerant HFO-1234yf 2019-01-0150
In last few years, the author has conducted a number of experimental studies with refrigerant HFO-1234yf. In these experimental studies, the author has experimentally determined overall system performance along with detailed condenser thermal and hydrodynamic performances by experimentally measuring condensation heat transfer coefficients for HFO-1234yf for typical automotive parallel flow condensers. In some of the studies by the author, the experimentally measured heat transfer coefficients for condensation were compared to the predictions from standard correlations available in the literature. The experimentally measured magnitudes of the heat transfer coefficients were within ±14~21% of the predicted numbers. However, these correlations were not specifically developed for HFO-1234yf refrigerant. Hence, it is important that we develop a correlation specifically for HFO-1234yf that could be used by engineers and designers for predicting heat transfer coefficients for condensation of HFO-1234yf in condenser tubes.
In this paper, the author has presented a correlation that has been specifically developed for prediction of condensation heat transfer coefficients for HFO-1234yf for typical automotive condensers and refrigerant mass flow fluxes. Experimental data has been used with MINITAB software, Version 16.1.0 to develop this correlation. Multivariate nonlinear regression analysis has been done to develop this correlation. Experimental data along with refrigerant properties, hydraulic diameter that affects Reynolds number, Prandtl number and other appropriate variables have been used to develop this correlation. Details of the newly developed correlation will be presented in the paper. Currently at this time, we do not have a correlation in the open literature that has been specifically developed for predicting condensation heat transfer coefficients for HFO-1234yf for automotive application.