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Session: Session 2C: Experimental prototypes (1)
Session starts: Monday 09 September, 14:00
Presentation starts: 14:40
Room: Templar's

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Puyao Wang (703 Research Institute of China Shipbuilding Industry Corporation, Harbin 150078, China)
Zhe Wu (703 Research Institute of China Shipbuilding Industry Corporation, Harbin 150078, China)
Long Chen (703 Research Institute of China Shipbuilding Industry Corporation, Harbin 150078, China)
Qingyang Han (703 Research Institute of China Shipbuilding Industry Corporation, Harbin 150078, China)
Zhiwei Yuan (703 Research Institute of China Shipbuilding Industry Corporation, Harbin 150078, China)

Abstract:
The experimental study of a 315kW organic Rankine cycle (ORC) system using a radial-flow turbine, brazed plate heat exchangers (BHPE) and R134a has been investigated. An ORC system start-up mode of matching R134a flux with heat source temperature is introduced in this paper. In order to maintain the stable operation of each device of the ORC system, R134a flux should be gradually increased with the rise of the heat source temperature. Experiments were conducted for R134a flux ranging from 5.1kg/s to 19.0kg/s with the hot source temperature from 65℃ to 95℃, cold source temperature from 5.2℃ to 12.1℃.The effects of electrical power, turbine back pressure, heat exchangers pressure drop and exergy loss during the process of system start-up are examined. The experimental results show that the temperature of cold source and the R134a flux have great influence on the turbine back pressure, thus affecting the turbine output power. The lower the temperature of the cold source, the smaller the flux of R134a required for the generator to achieve the full power. Under the condition that the temperature of cold source is 5.2℃, the minimum R134a flux required for the electrical power to reach 315 kW is 17.7 kg/s, and the corresponding net power generation efficiency is 6.5%.