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Thermodynamic analysis and optimization of an (organic Rankine cycle) ORC using low grade heat source

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  • Wang, Jiangfeng
  • Yan, Zhequan
  • Wang, Man
  • Ma, Shaolin
  • Dai, Yiping

Abstract

Organic Rankine cycle can effectively recover the low grade heat source due to its distinctive thermodynamic performance. Based on the thermodynamic mathematical models of an ORC (organic Rankine cycle) system, this study examines the effects of key thermodynamic design parameters, including turbine inlet pressure, turbine inlet temperature, pinch temperature difference and approach temperature difference in (heat recovery vapor generator) HRVG, on the net power output and surface areas of both the HRVG and the condenser using R123, R245fa and isobutane. Considering the economic factor for the system optimization design, a ratio of net power output to total heat transfer area is selected as the performance evaluation criterion to predict the system performance from the view of both thermodynamics and economics. Genetic algorithm is employed to optimize the system performance. The results show that turbine inlet pressure, turbine inlet temperature, pinch temperature difference and approach temperature difference have significant effects on the net power output and surface areas of both the HRVG and the condenser. By parametric optimization, the ORC system with isobutane has the best system performance than that with R123 or R245fa. The optimum pinch temperature difference and approach temperature difference are generally located at upper boundary over their parametric design ranges.

Suggested Citation

  • Wang, Jiangfeng & Yan, Zhequan & Wang, Man & Ma, Shaolin & Dai, Yiping, 2013. "Thermodynamic analysis and optimization of an (organic Rankine cycle) ORC using low grade heat source," Energy, Elsevier, vol. 49(C), pages 356-365.
    • Handle: RePEc:eee:energy:v:49:y:2013:i:c:p:356-365
    DOI: 10.1016/j.energy.2012.11.009
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    References listed on IDEAS

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    1. Roy, J.P. & Mishra, M.K. & Misra, Ashok, 2010. "Parametric optimization and performance analysis of a waste heat recovery system using Organic Rankine Cycle," Energy, Elsevier, vol. 35(12), pages 5049-5062.
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    3. Roy, J.P. & Misra, Ashok, 2012. "Parametric optimization and performance analysis of a regenerative Organic Rankine Cycle using R-123 for waste heat recovery," Energy, Elsevier, vol. 39(1), pages 227-235.
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