Experimental analysis of high temperature flow boiling heat transfer and pressure drop in a plate heat exchanger

• High temperature flow boiling of seven working fluids is experimentally analyzed. Two heat transfer mechanisms are identified among different fluids. A superposition model developed for the coefficient prediction. The propane up to 152% higher than that R236fa. Isobutane has lowest frictional pressure drop Organic Rankine cycle technology gained worldwide acceptance as an efficient way utilize low-grade sources. Plate exchangers most common type exchanger employed evaporators in small-scale organic units, which a high saturation prevailing condition. However, there lack research on plate exchangers. This paper presents experimental analysis and characteristics exchanger, development prediction methods drop. Seven fluids, R134a, R236fa, R245fa, R1234ze(E), R1233zd(E), isobutane, were tested at reduced pressures 0.45, 0.55 0.65, corresponding temperatures ranging from 55 °C 141 °C, various mass fluxes. mechanisms, nucleate thin-film evaporation, processes due diversity their thermo-physical properties. Moreover, results indicate isobutane have coefficients other while R236fa coefficient. drops show same all increasing with increase vapor quality flux decrease temperature. presented achieves good data, 12.8% mean absolute percentage deviation. correlation previous work by authors enables 11.1% deviation data. will facilitate modelling design units.