Abstract
To generate electric power from unused heat, realization of heat engines that can work under small temperature difference during the heat exchange processes are required. Trilateral cycle can maximize the exergy recovery from waste heat. The working fluid is maintained in a liquid phase during the heating process and it expands in the expander in gas-liquid two phase. In the present study, a novel reciprocating positive displacement expander for two phase expansion which can achieve large expansion ratio, high airtightness and low vibration is proposed. And issues for practical application is discussed.
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