Tuesday, August 22nd, 2017

Fluids and parameters optimization for a novel cogeneration system driven by low-temperature geothermal sources

Publication year: 2011brbSource:/b Energy, In Press, Corrected Proof, Available online 12 March 2011brT., Guo , H.X., Wang , S.J., ZhangbrA novel cogeneration system was proposed and techno-economically investigated, consisting of a low-temperature geothermally-powered organic Rankine cycle (ORC) subsystem, an intermediate heat exchanger subsystem and a heat pump subsystem. The main purpose is to identify suitable working fluids (among 27 fluids with boiling point temperature ranging from −47.69 to 47.59°C) and optimized cycle parameters for the ORC-based power generation subsystem. The screening criteria include net power output per unit mass flow rate of hot source (Pnet), the ratio of total heat transfer area to net power output (A/Wnet), and electricity production cost (epc). Results show that there exists optimum evaporating…br Highlights: ►A new power and heat cogeneration system using low-temperature geothermal sources was proposed and techno-economically investigated. ►It consisted of an organic Rankine cycle (ORC) subsystem, an intermediate heat exchanger subsystem and a heat pump subsystem. ►Suitable working fluids among 27 pure fluids and optimized cycle parameters for the ORC subsystem were identified with three different screening criteria. ►Different screening criteria led to different fluid and cycle parameter recommendations. ►E170, R600 and R141b presented better performances comprehensively.


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