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Utilizing primary energy savings and exergy destruction to compare centralized thermal plants and cogeneration/trigeneration systems

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  • Espirito Santo, Denilson Boschiero do
  • Gallo, Waldyr Luiz Ribeiro

Abstract

Rising energy conversion processes efficiencies reduces CO2 emissions and global warming implications. Decentralized electricity production through cogeneration/trigeneration systems can save primary energy if it operates with high efficiency. High efficiency is obtained when the system produces electricity and a substantial amount of the energy rejected by the prime mover is used to meet site thermal demands. Environmental concerns and international agreements are directing governments of different countries to incentive high efficiency solutions. Centralized thermal plants and cogeneration/trigeneration efficiency are compared through efficiency indicators using the first law of thermodynamics and the second law of thermodynamics. This paper proposes the use of the primary energy savings analysis and the exergy destruction analysis to compare decentralized power production through cogeneration/trigeneration systems and centralized thermal plants. The analysis concluded that both methods achieve the same results if the thermal efficiency indicator is used to compare the methods. The analysis also revealed that trigeneration systems with the same energy input are comparable with quite different thermal efficiency centralized thermal plants. Case 1 is comparable to a 53% thermal efficiency power plant and case 2 is comparable to a 77% thermal efficiency power plant.

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  • Espirito Santo, Denilson Boschiero do & Gallo, Waldyr Luiz Ribeiro, 2017. "Utilizing primary energy savings and exergy destruction to compare centralized thermal plants and cogeneration/trigeneration systems," Energy, Elsevier, vol. 120(C), pages 785-795.
    • Handle: RePEc:eee:energy:v:120:y:2017:i:c:p:785-795
    DOI: 10.1016/j.energy.2016.11.130
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    1. Urbanucci, Luca & Bruno, Joan Carles & Testi, Daniele, 2019. "Thermodynamic and economic analysis of the integration of high-temperature heat pumps in trigeneration systems," Applied Energy, Elsevier, vol. 238(C), pages 516-533.

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