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Combined heat and power considered as a virtual steam cycle heat pump

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  • Lowe, Robert

Abstract

The first aim of this paper is to shed light on the thermodynamic reasons for the practical pursuit of low temperature operation by engineers involved in the design and the operation of combined heat and power (CHP) and district heating (DH) systems. The paper shows that the steam cycle of a combined heat and power generator is thermodynamically equivalent to a conventional steam cycle generator plus an additional virtual steam cycle heat pump. This apparently novel conceptualisation leads directly to (i) the observed sensitivity of coefficient of performance of CHP to supply and return temperatures in associated DH systems, and (ii) the conclusion that the performance of CHP will tend to be significantly higher than real heat pumps operating at similar temperatures. The second aim, which is pursued more qualitatively, is to show that the thermodynamic performance advantages of CHP are consistent with the goal of deep, long-term decarbonisation of industrialised economies. As an example, estimates are presented, which suggest that CHP based on combined-cycle gas turbines with carbon capture and storage has the potential to reduce the carbon intensity of delivered heat by a factor of ~30, compared with a base case of natural gas-fired condensing boilers.

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  • Lowe, Robert, 2011. "Combined heat and power considered as a virtual steam cycle heat pump," Energy Policy, Elsevier, vol. 39(9), pages 5528-5534, September.
    • Handle: RePEc:eee:enepol:v:39:y:2011:i:9:p:5528-5534
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    1. Sayegh, M.A. & Danielewicz, J. & Nannou, T. & Miniewicz, M. & Jadwiszczak, P. & Piekarska, K. & Jouhara, H., 2017. "Trends of European research and development in district heating technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P2), pages 1183-1192.
    2. Jiménez Navarro, Juan Pablo & Kavvadias, Konstantinos C. & Quoilin, Sylvain & Zucker, Andreas, 2018. "The joint effect of centralised cogeneration plants and thermal storage on the efficiency and cost of the power system," Energy, Elsevier, vol. 149(C), pages 535-549.
    3. Jimenez-Navarro, Juan-Pablo & Kavvadias, Konstantinos & Filippidou, Faidra & Pavičević, Matija & Quoilin, Sylvain, 2020. "Coupling the heating and power sectors: The role of centralised combined heat and power plants and district heat in a European decarbonised power system," Applied Energy, Elsevier, vol. 270(C).
    4. Li, Yan & Chang, Shanshan & Fu, Lin & Zhang, Shuyan, 2016. "A technology review on recovering waste heat from the condensers of large turbine units in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 287-296.
    5. Anna Kwiotkowska & Bożena Gajdzik & Radosław Wolniak & Jolita Vveinhardt & Magdalena Gębczyńska, 2021. "Leadership Competencies in Making Industry 4.0 Effective: The Case of Polish Heat and Power Industry," Energies, MDPI, vol. 14(14), pages 1-21, July.
    6. Colmenar-Santos, Antonio & Rosales-Asensio, Enrique & Borge-Diez, David & Blanes-Peiró, Jorge-Juan, 2016. "District heating and cogeneration in the EU-28: Current situation, potential and proposed energy strategy for its generalisation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 62(C), pages 621-639.
    7. García Kerdan, Iván & Raslan, Rokia & Ruyssevelt, Paul & Morillón Gálvez, David, 2017. "The role of an exergy-based building stock model for exploration of future decarbonisation scenarios and policy making," Energy Policy, Elsevier, vol. 105(C), pages 467-483.
    8. Ommen, Torben & Markussen, Wiebke Brix & Elmegaard, Brian, 2016. "Lowering district heating temperatures – Impact to system performance in current and future Danish energy scenarios," Energy, Elsevier, vol. 94(C), pages 273-291.
    9. Staffell, Iain, 2015. "Zero carbon infinite COP heat from fuel cell CHP," Applied Energy, Elsevier, vol. 147(C), pages 373-385.
    10. Kavvadias, Konstantinos C. & Quoilin, Sylvain, 2018. "Exploiting waste heat potential by long distance heat transmission: Design considerations and techno-economic assessment," Applied Energy, Elsevier, vol. 216(C), pages 452-465.
    11. Razmara, M. & Maasoumy, M. & Shahbakhti, M. & Robinett, R.D., 2015. "Optimal exergy control of building HVAC system," Applied Energy, Elsevier, vol. 156(C), pages 555-565.
    12. Werner, Sven, 2017. "International review of district heating and cooling," Energy, Elsevier, vol. 137(C), pages 617-631.
    13. Bach, Bjarne & Werling, Jesper & Ommen, Torben & Münster, Marie & Morales, Juan M. & Elmegaard, Brian, 2016. "Integration of large-scale heat pumps in the district heating systems of Greater Copenhagen," Energy, Elsevier, vol. 107(C), pages 321-334.
    14. Ommen, Torben & Markussen, Wiebke Brix & Elmegaard, Brian, 2014. "Heat pumps in combined heat and power systems," Energy, Elsevier, vol. 76(C), pages 989-1000.
    15. Michel Feidt & Monica Costea, 2012. "Energy and Exergy Analysis and Optimization of Combined Heat and Power Systems. Comparison of Various Systems," Energies, MDPI, vol. 5(9), pages 1-22, September.
    16. Liao, Chunhui & Ertesvåg, Ivar S. & Zhao, Jianing, 2013. "Energetic and exergetic efficiencies of coal-fired CHP (combined heat and power) plants used in district heating systems of China," Energy, Elsevier, vol. 57(C), pages 671-681.

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