HTGR is an advanced gas reactor that utilized high temperature and high pressure. This paper investigated five different working gas in four Brayton cycle configurations in HTGR 10MWth. Thermodynamic analysis using gas-cold standard assumption were applied to measure the efficiencies. This paper also considered temperature interaction in heat exchangers and capability turbine to drive compressor. Particular gas would be suitable for particular pressure ratio and diagram. 1T2C diagram with pressure ratio 9 and carbon dioxide as the working gas were able to reach optimum thermal efficiency, were about 52 %.
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