Condensation of R-134a inside micro-fin helical coiled tube-in-shell type heat exchanger

Moreover, the effect of mass flux, vapor quality and saturation temperature of R-134a on the heat transfer coefficients and pressure drops are examined. Comparisons between smooth straight tube and micro-fin helical coiled tube are also discussed. The experimental results show that the micro-fin helical coiled tube produces a higher heat transfer coefficient and a frictional pressure drop compared to smooth straight tube. The new correlations have been proposed to predict the Nusselt number and frictional pressure drop multiplier during condensation of R-134a inside micro-fin helical coil tube.