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Analysis of a carbon dioxide transcritical power cycle using a low temperature source

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  • Cayer, Emmanuel
  • Galanis, Nicolas
  • Desilets, Martin
  • Nesreddine, Hakim
  • Roy, Philippe

Abstract

A detailed analysis of a carbon dioxide transcritical power cycle using an industrial low-grade stream of process gases as its heat source is presented. The methodology is divided in four steps: energy analysis, exergy analysis, finite size thermodynamics and calculation of the heat exchangers' surface. The results have been calculated for fixed temperature and mass flow rate of the heat source, fixed maximum and minimum temperatures in the cycle and a fixed sink temperature by varying the high pressure of the cycle and its net power output. The main results show the existence of an optimum high pressure for each of the four steps; in the first two steps, the optimum pressure maximises the thermal or exergetic efficiency while in the last two steps it minimises the product UA or the heat exchangers' surface. These high pressures are very similar for the energy and exergy analyses. The last two steps also have nearly identical optimizing high pressures that are significantly lower that the ones for the first two steps. In addition, the results show that the augmentation of the net power output produced from the limited energy source has no influence on the results of the energy analysis, decreases the exergetic efficiency and increases the heat exchangers' surface. Changing the net power output has no significant impact on the high pressures optimizing each of the four steps.

Suggested Citation

  • Cayer, Emmanuel & Galanis, Nicolas & Desilets, Martin & Nesreddine, Hakim & Roy, Philippe, 2009. "Analysis of a carbon dioxide transcritical power cycle using a low temperature source," Applied Energy, Elsevier, vol. 86(7-8), pages 1055-1063, July.
    • Handle: RePEc:eee:appene:v:86:y:2009:i:7-8:p:1055-1063
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    References listed on IDEAS

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    1. Zhang, X.R. & Yamaguchi, H. & Fujima, K. & Enomoto, M. & Sawada, N., 2007. "Theoretical analysis of a thermodynamic cycle for power and heat production using supercritical carbon dioxide," Energy, Elsevier, vol. 32(4), pages 591-599.
    2. Hung, T.C. & Shai, T.Y. & Wang, S.K., 1997. "A review of organic rankine cycles (ORCs) for the recovery of low-grade waste heat," Energy, Elsevier, vol. 22(7), pages 661-667.
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