Computational Model and Experimental Data on the Natural Circulation of Supercritical Carbon Dioxide

by Douglas V. Milone
Knolls Atomic Power Laboratory

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Supercritical carbon dioxide is investigated for its capability to passively remove heat through natural circulation. Experimental data is collected measuring the temperature differential needed to remove 500W of heat at loop pressures from 1100 to 2000 psia and temperatures from 88 to 140°F. Data is compared to a computational model developed in TRACE, a power plant modeling tool developed by the NRC. The computational model gave reasonable agreement to data, but significant enhanced mass flow was observed at some conditions near the pseudo-critical temperature.