Abstract
Interest in hydrofluoroolefins (HFOs) based refrigerants, which have significantly lower global warming potential compared to currently used hydrofluorocarbons (HFCs) refrigerants, is increasing. However, heat transfer experiments of HFO refrigerants are limited in double-tube heat exchangers and square channels. Therefore, in this study, the flow boiling heat transfer characteristics and pressure drop of HFO-1234yf in a plate-fin heat exchanger were analyzed. The main results are as follows. The flow boiling heat transfer coefficient increases as the vapor quality increases; however, at certain point of high vapor quality, it decreases rapidly. As the mass flux, heat flux and saturation temperature increase, the flow boiling heat transfer coefficient increases.
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