Experimental Validation of Condensation Heat Transfer in PCCS (Passive Containment Cooling System) Heat Exchanger

摘要

Experiment on the performance of condensation heat exchanger in the PCCS was successfully performed with a single tube having an equivalent dimension and material to the prototype design. The results of the performance verification test using a single bare heat exchanger tube show similar tendency to the results reported by the external wall condensation experiments of the conventional heat exchanger. As the wall subcooling degree increases, the heat flux increases, but the condensation heat transfer coefficient tends to decrease due to an accumulation effect of non-condensable gas around the wall. Also, when compared to JNU experimental results, the present test results showed the reasonable trend for the pressure and diameter effects on the condensation heat transfer characteristics. The present experimental result will be utilized to develop a mechanistic model for the condensation heat transfer of the PCCS and evaluate the cooling capability of the prototypic heat exchanger tube. As for a further work, flow instability inside the PCCS will be experimentally investigated and a heat transfer characteristics will be evaluated for bundle heat exchanger of PCCS.