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Effects of market and climatic conditions over a gas turbine combined cycle integrated with a Heat Pump for inlet cooling

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  • Giugno, Andrea
  • Sorce, Alessandro
  • Cuneo, Alessandra
  • Barberis, Stefano

Abstract

The growing need of dispatchable units, capable to balance the variable renewable energy electrical production leads to the development of strategies aimed at increasing power plants operational flexibility and global efficiency in part-load operation. A highly efficient heat pump (integrated in a conventional natural gas combined cycle is here proposed as a flexibility enhancement solution. Such concept, applied to power oriented combined cycle, allows to modify the compressor intake temperature with a consequent increase of the power production. While this operation for open cycle gas turbine is beneficial also to electric efficiency, combined cycles’ efficiency is less sensitive to the temperature variation and thus more influenced by the auxiliary consumption. The selection of the proper heat pump size for the proposed layout was based on an optimization process considering both combined cycle and heat pump off-design performance. After a statistical analysis of climatic data and their correlations with energy market condition for the six Italian price zones, the models developed were applied to assess the thermoeconomic potential of the proposed layout. This work highlights how a proper optimization process influences both revenues and size optimization and to highlight how such integrated system can be selected at its best considering typical market and climatic frames. The ratio between the air-cooled heat pump electrical consumption and the electrical combined cycle capacity that maximize power production increase was found to be 1/100. This finding can be extended to the others world Humid subtropical climate and Mediterranean hot summer climates zones. It is underlined how electrical market conditions could jeopardize the installation profits even under favourable climatic potential reducing the optimal economic heat pump size. Using off-design curves and optimization algorithm in performing coupling analysis appears to be more effective, with respect to simplified calculations under unfavourable economic and climate conditions.

Suggested Citation

  • Giugno, Andrea & Sorce, Alessandro & Cuneo, Alessandra & Barberis, Stefano, 2021. "Effects of market and climatic conditions over a gas turbine combined cycle integrated with a Heat Pump for inlet cooling," Applied Energy, Elsevier, vol. 290(C).
    • Handle: RePEc:eee:appene:v:290:y:2021:i:c:s0306261921002415
    DOI: 10.1016/j.apenergy.2021.116724
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    References listed on IDEAS

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    1. Moon, Seong Won & Kwon, Hyun Min & Kim, Tong Seop & Kang, Do Won & Sohn, Jeong Lak, 2018. "A novel coolant cooling method for enhancing the performance of the gas turbine combined cycle," Energy, Elsevier, vol. 160(C), pages 625-634.
    2. Gareta, Raquel & Romeo, Luis M. & Gil, Antonia, 2004. "Methodology for the economic evaluation of gas turbine air cooling systems in combined cycle applications," Energy, Elsevier, vol. 29(11), pages 1805-1818.
    3. Antonelli, Marco & Desideri, Umberto & Franco, Alessandro, 2018. "Effects of large scale penetration of renewables: The Italian case in the years 2008–2015," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P2), pages 3090-3100.
    4. Kwon, Hyun Min & Kim, Tong Seop & Sohn, Jeong Lak & Kang, Do Won, 2018. "Performance improvement of gas turbine combined cycle power plant by dual cooling of the inlet air and turbine coolant using an absorption chiller," Energy, Elsevier, vol. 163(C), pages 1050-1061.
    5. Singh, Omendra Kumar, 2016. "Performance enhancement of combined cycle power plant using inlet air cooling by exhaust heat operated ammonia-water absorption refrigeration system," Applied Energy, Elsevier, vol. 180(C), pages 867-879.
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    Cited by:

    1. Zhang, Yuanzhe & Liu, Pei & Li, Zheng, 2023. "Gas turbine off-design behavior modelling and operation windows analysis under different ambient conditions," Energy, Elsevier, vol. 262(PA).

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