Title: Effect of exergy optimisation on a cogeneration system's CO₂ emissions according to different demand patterns

Authors: Joao Gari da Silva Fonseca Junior, Hitoshi Asano, Terushige Fujii, Shigeki Hirasawa

Addresses: Department of Mechanical Systems, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan. ' Department of Mechanical Systems, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan. ' Department of Mechanical Systems, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan. ' Department of Mechanical Systems, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan

Abstract: The objective of this work is to verify how different operational strategies affect the CO₂ emissions of a cogeneration system according to different demand patterns. The operation strategies studied were focused in running cost and exergetic efficiency. The results show that the optimal exergetic efficiency strategy generated the highest emissions reduction. The operation with the highest average ratio between heat and power loads presented the best reduction of CO₂ emissions, around 13%. Minimising the running cost reduced CO₂ emissions in 11.7% for the highest average heat and power ratio demand whereas for the lowest ratio the emissions increased 24.3%.

Keywords: CHP systems; CO₂ emissions; exergy analysis; partial load modelling; operation strategy optimisation; carbon dioxide; cogeneration systems; combined heat and power.

DOI: 10.1504/IJEX.2008.018112

International Journal of Exergy, 2008 Vol.5 No.3, pp.296 - 308

Published online: 02 May 2008 *

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