Modeling of the heat transfer characteristics of the effective thermal conductivity test facility for high temperature gas-cooled reactors

REN Cheng; YANG Xingtuan; LI Congxin; SUN Yanfei; LIU Zhiyong

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Journal of Tsinghua University(Science and Technology) ›› 2015, Vol. 55 ›› Issue (9) : 991-997.

Modeling of the heat transfer characteristics of the effective thermal conductivity test facility for high temperature gas-cooled reactors

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Abstract

The effective thermal conductivity is a characteristic parameter which represents the macroscopic heat transfer ability of the pebble bed type core of the high temperature gas-cooled reactor. A full-scale effective thermal conductivity measurement facility was developed by the Institute of Nuclear and New Energy Technology of Tsinghua University to improve calculations and safety analyses of the Chinese high temperature gas-cooled reactor design using experiments in a static graphite pebble bed in a vacuum or helium environment. A simplified two-dimensional model was used to simulate the thermal conduction and radiation characteristics of the facility under vacuum and at high temperatures. The steady and transient heat transfer characteristics were calculated to assess the radial temperature distribution in the pebble bed zone, the influences of different materials in the top and bottom insulating layers, overheating of the central heaters and temperature increases and decreases to guide operation of the experimental facility.

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high temperature gas-cooled reactor / effective thermal conductivity / high temperature and vacuum condition / temperature distribution calculation

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REN Cheng, YANG Xingtuan, LI Congxin, SUN Yanfei, LIU Zhiyong. Modeling of the heat transfer characteristics of the effective thermal conductivity test facility for high temperature gas-cooled reactors[J]. Journal of Tsinghua University(Science and Technology). 2015, 55(9): 991-997

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