Abstract
Liquid hydrogen is expected to be an alternative to fossil fuel. In this study, the gas turbine cycle with the precooler and hydrogen turbine is proposed to utilize the cryogenic exergy contained in the liquid hydrogen effectively. Since the geometry of the precooler greatly affects the performance of the system, it is optimized to give the maximum specific work output and/or the maximum exergy efficiency. In addition, the mass flow rate of hydrogen in the precooler is not restricted to that used for combustion. The ratio α of hydrogen mass flow rate is introduced as a measure indicating the precooling effect. The surplus hydrogen is assumed to be consumed in the external gas turbine system. The effect of α on the output and the exergy efficiency of the total system is made clear.
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