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Engineering analysis of uncertainties in the performance evaluation of CHP systems

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  • Dentice d’Accadia, Massimo
  • Musto, Marilena

Abstract

From January 1, 2011, in all UE countries the combined production of electric (or mechanical) and thermal energy (also called Combined Heat and Power, CHP, or cogeneration) is recognized as a high efficiency technology only when it is able to ensure a minimum value of energy saving with respect to the separate production of the same energy flows. The Directive 8/2004/EC, and a few successive Decisions of the European Commission, introduced a methodology to establish whether any cogeneration plant, existing or new, can be acknowledged as a high-efficiency CHP plant, and can therefore be supported from the UE member states. In the paper, such methodology, based on the evaluation of a standard Primary Energy Saving (PES) index, is briefly described, and then a metrological analysis is presented, in order to evaluate the uncertainties affecting the field evaluation of such index. Three numerical examples are also presented and discussed, referred to natural gas plants, showing that the evaluation of the PES index can be quite critical, especially for values close to the minimum limit fixed by the Directive, and in particular for small and medium scale CHP units, mainly due to the low accuracy that usually affect, in such cases, the measures of the fuel input.

Suggested Citation

  • Dentice d’Accadia, Massimo & Musto, Marilena, 2011. "Engineering analysis of uncertainties in the performance evaluation of CHP systems," Applied Energy, Elsevier, vol. 88(12), pages 4927-4935.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:12:p:4927-4935
    DOI: 10.1016/j.apenergy.2011.06.037
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    References listed on IDEAS

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    1. Giaccone, L. & Canova, A., 2009. "Economical comparison of CHP systems for industrial user with large steam demand," Applied Energy, Elsevier, vol. 86(6), pages 904-914, June.
    2. Hinnells, Mark, 2008. "Combined heat and power in industry and buildings," Energy Policy, Elsevier, vol. 36(12), pages 4522-4526, December.
    3. Cardona, E. & Piacentino, A., 2005. "Cogeneration: a regulatory framework toward growth," Energy Policy, Elsevier, vol. 33(16), pages 2100-2111, November.
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