Experimental Investigation and CFD Analysis of Heat Transfer in Single Phase Subcooler of a Small Scale Waste Heat Recovery ORC

Research paper by Tryfon C.Roumpedakisa, SpirosChapalogloua, PlatonPallisa, Aris-DimitriosLeontaritisa, KonstantinosBraimakisa, SotiriosKarellasa, PanagiotisVourliotisa

Indexed on: 09 Nov '17Published on: 01 Sep '17Published in: Energy Procedia


In the present work, a detailed investigation of the single phase heat transfer mechanism in a novel subcooler of an experimental small scale waste heat recovery Organic Rankine Cycle (ORC) unit is presented. The ORC unit is operating with R134a and is designed to utilize the waste heat from the jacket water of marine diesel auxiliary internal combustion engines (ICEs). The ORC unit produces 3.7 kWel net electrical power at a cycle pressure of 25 bar and an expander inlet temperature of 82 °C. The application of subcooling in such systems is common practice, so as to ensure the cavitation-free operation of the pump.