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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 12    December 2019

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Coupling effect of evaporation and condensation processes of organic Rankine cycle for geothermal power generation improvement
YANG Hua(杨华), MENG Nan(孟楠), LI Tai-lu(李太禄)

School of Energy and Environmental Engineering, Hebei University of Technology,
Tianjin 300401, China

Abstract:Organic Rankine cycle (ORC) is widely used for the low grade geothermal power generation. However, a large amount of irreversible loss results in poor technical and economic performance due to its poor matching between the heat source/sink and the working medium in the condenser and the evaporator. The condensing temperature, cooling water temperature difference and pinch point temperature difference are often fixed according to engineering experience. In order to optimize the ORC system comprehensively, the coupling effect of evaporation and condensation process was proposed in this paper. Based on the laws of thermodynamics, the energy analysis, exergy analysis and entropy analysis were adopted to investigate the ORC performance including net output power, thermal efficiency, exergy efficiency, thermal conductivity, irreversible loss, etc., using geothermal water at a temperature of 120℃ as the heat source and isobutane as the working fluid. The results show that there exists a pair of optimal evaporating temperature and condensing temperatures to maximize the system performance. The net power output and the system comprehensive performance achieve their highest values at the same evaporating temperature, but the system comprehensive performance corresponds to a lower condensing temperature than the net power output.

 

Key words: Organic Rankine cycle; geothermal power generation; coupling effect of evaporation and condensation; exergy analysis

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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