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Session: Poster session & Sponsor Exhibition
Session starts: Monday 07 October, 14:00

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Yuanwei Lu (Beijing Univrsity of Technology)
Guanglin Liu (North China Electric Power University)
Yu-Ting Wu (Beijing University of Technology)
Chong-Fang Ma (Beijing University of Technology)

Abstract:
Organic Rankin cycle for power generation can make an effective use of geothermal heat. Organic working fluids with low boiling point can take advantage of low-to-medium temperature of geothermal fluid for power generation, which has less pollution to the environment than other forms of power generation. Therefore, people pay more attentions on it. Supercritical organic Rankin cycle system can theoretically form a "triangular" shape of cycle, during which the working fluids can change directly from sub-critical to supercritical state in the evaporator and the temperature of it can change continuously with no phase change. Researches showed that exergy efficiency of supercritical organic rankine system can reach 50%. However, there is few research on the effect of expander inlet temperature and pressure on the net power at different geothermal temperature. The working fluids are also need to be studied in supercritical geothermal power generation system. In this paper, a supercritical organic Rankin cycle with heat recovery process (as shown in Fig.1) using medium-temperature geothermal fluid (150 ℃ - 180 ℃) as heat source was built to study the effect of different parameters on the net power. In order to form a supercritical organic Rankin cycle, the critical temperature of working fluids should be lower than the heat source temperature. For the fluorocarbons working fluids can be decomposed when it contact with oil, steel or iron at the temperature above 122℃. Therefore, in this paper the R290 (propane) was choiced as working fluid. The experimental results showed that at the different geothermal temperature there existed an optimal temperature and at the optimal temperature condition there existed the optimal evaporating pressure.