Inaugural US-EU-China Thermophysics Conference-Renewable Energy 2009 (UECTC 2009 Proceedings)
22 Performance Analysis for an Organic Rankine Cycle Using Engine Exhaust Gas as Heat Source
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In the present study, organic Rankine cycle uses an HCCI (Homogeneous Charge Compression Ignition) engine exhaust gas as high-temperature reservoir. The working fluids under investigation are refrigerant and benzene-series. Four non-flammable refrigerants: R141b, R123, R245ca, R245fa have been compared under different engine speed and turbine inlet pressures. R141b shows the best performance. In the mean time, R141b has also been compared with toluene under the same engine working condition. Toluene shows not only higher efficiency in power generation but also less mass flow rate than that of R141b. The influences of engine inlet air pressure on the thermal efficiency of ORC and the overall efficiency of HCCI-ORC system have been also investigated. Low speed with high engine inlet pressure performs higher efficiency; while a naturally aspirated engine has the better performance when the engine speed is higher.