Seminar 34 -- Thermal and Hydraulic Performance of Low GWP Refrigerants under Flow Condensation PDF

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The environmental impact of conventional HFC refrigerants and their subsequent phasing out has led to the evaluation of heat transfer and pressure drop performance of alternative low-GWP refrigerants. This seminar highlights the flow condensation performance of several low-GWP refrigerants, both pure and HFC/HFO mixtures, in 0.95 mm multi-channels tube, and smooth and internally enhanced microfin tubes of 4 mm to 9 mm diameter. R-32, R-1234yf, R-454C, R-450A, and R-513A were experimentally investigated to compare with R134a and R410A, and with existing correlations. This session benefits engineers with refrigerant selection and design of air-to-refrigerant and liquid-to-refrigerant heat transfer equipment.

1. Condensation Heat Transfer Performance of R513A and R450A in Minichannel Square Tubes
   Melanie Derby, Ph.D., Member, Kansas State University, Manhattan, KS
2. Condensation Heat Transfer and Pressure Drop for Single Component and Refrigerant Mixtures in Smooth and Enhanced Tube Geometries
   Saad Jajja, Ph.D., Oak Ridge National Laboratory, Oak Ridge, TN
3. Condensation of R32 inside Microfin and Smooth ID 4mm Tubes: A Direct Experimental Comparison
   Simone Mancin, Ph.D., University of Padova, Padua, TN, Italy
4. Condensation of Low Global Warming Potential Non-Azeotropic Mixture R454C in Horizontal Microfin Tubes
   Brian Fronk, Ph.D., Member, Oregon State University, Corvallis, OR