The influence of N2 mass fraction

coolant mass flux and mixture mass flux on condensation heat transfer in the horizontal rectangular channel have been investigated

with the mixture mass flux ranging from 38 kg·m-2·s-1 to 132 kg·m-2·s-1. The results show that when the steam flows at high speed

the deterioration of noncondensable gas on the condensation heat transfer is relatively decreased

8% noncondensable gas results in the reduction of 26.4% in condensation heat transfer coefficient. The condensation heat transfer coefficient increases with the increase of the mixture mass flux and decreases with the increase of the coolant mass flux. Moreover

the variations of the condensation heat transfer along the mixture flow direction are also obtained

the results show that the local condensation heat transfer coefficient decreases along the mixture flow direction.