基于实际换热的ORC亚/跨临界综合评价

Based on the latest research results of heat transfer characteristics of organic Rankine cycle (ORC) transcritical and subcritical refrigerants, a thermodynamic and economic model considering actual heat transfer conditions is established by using the thermodynamic index heat recovery efficiency and the concept of net present value in economics. The thermodynamic and economic analysis is more comprehensive and reliable which provides a reference for the selection of subcritical and transcritical cycles in engineering practice. When the heat exchanger area and NPV are taken into account, the superiority of supercritical cycles over subcritical cycles in simple thermodynamic analysis is reduced. For industrial waste heat, the optimization interval of the system crosses the supercritical and sub-critical, P/P_c=0.82~1.30, T₃=103~147℃, and the recovery efficiency of heat source can reach 61%. The economic benefit is high, and the change of temperature and pressure is not sensitive, so the system can accommodate certain fluctuations.