which was approximately 65–270 kg/h.
The average heat transfer coefficients for the evaporator and
condenser are shown in Figs. 12 and 13, respectively. The evaporator
performance is affected by the water inlet temperature. The heat
transfer coefficient is 214 W/m2/K when the water temperature is
50 C at the inlet and increases to 351 W/m2/K when the water temperature
is 90 C. Increasing the water inlet temperature increases
the heat transfer coefficient for the evaporator due to the increased
R134a mass flux in the evaporator. Compared to the evaporator, the
heat transfer coefficient variance is small in the condenser. Its value
is also quite small, approximately 60 W/m2/K. The water inlet temperature
has a negligible effect. The heat transfer performance
within the condenser surface is improved by increasing the R134a
mass flux due to the increased water inlet temperature. However,
the heat transfer resistance outside the surface dominates the heat
transfer resistance of the condenser and does not change when the
water inlet temperature increases. Therefore, the entire heat transfer
resistance variance for the condenser is small.