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Integration of absorption refrigeration systems into Rankine power cycles to reduce water consumption: A thermodynamic analysis

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  • Salgado, R.
  • Belmonte, J.F.
  • Almendros-Ibáñez, J.A.
  • Molina, A.E.

Abstract

A high percentage of the heat that is supplied to thermoelectric power plants is discarded to ambient and must be handled by an external cooling system. This cooling system typically consists of wet cooling towers because of the excellent thermo-physical properties of water. However, the amount of water consumed for power production has reached alarming levels in developed countries. Air-cooled heat exchangers (ACHXs) appear to be the most adequate technology to substitute for wet cooling towers, but the use of this technology has some limitations. The most important limitation is the higher condenser pressures in the cycle, which produce backpressures at the condensing turbine's exit, increases in heat rejection and losses in the net plant efficiency. This paper presents a concept for the use of ACHXs in the cooling systems of power plants using an absorption refrigeration system (ARS) as an intermediary. Heat from the steam condenser is handled by the evaporator of the ARS and “lifted” to a higher temperature level, where the ACHXs are fitted to work. The generator of the ARS is fed by the power plant itself, extracting (bleeding off) some of the steam that flows through the steam turbine at the correct pressure and temperature.

Suggested Citation

  • Salgado, R. & Belmonte, J.F. & Almendros-Ibáñez, J.A. & Molina, A.E., 2017. "Integration of absorption refrigeration systems into Rankine power cycles to reduce water consumption: A thermodynamic analysis," Energy, Elsevier, vol. 119(C), pages 1084-1097.
    • Handle: RePEc:eee:energy:v:119:y:2017:i:c:p:1084-1097
    DOI: 10.1016/j.energy.2016.11.065
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    References listed on IDEAS

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    1. Gadhamshetty, Venkataramana & Gude, Veera Gnaneswar & Nirmalakhandan, Nagamany, 2014. "Thermal energy storage system for energy conservation and water desalination in power plants," Energy, Elsevier, vol. 66(C), pages 938-949.
    2. Besagni, Giorgio & Mereu, Riccardo & Inzoli, Fabio, 2016. "Ejector refrigeration: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 373-407.
    3. Rosegrant, Mark W. & Cai, Ximing & Cline, Sarah A., 2002. "Global water outlook to 2025," Food policy reports 14, International Food Policy Research Institute (IFPRI).
    4. Barigozzi, G. & Perdichizzi, A. & Ravelli, S., 2011. "Wet and dry cooling systems optimization applied to a modern waste-to-energy cogeneration heat and power plant," Applied Energy, Elsevier, vol. 88(4), pages 1366-1376, April.
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    Cited by:

    1. Ramírez, F. Javier & Salgado, R. & Almendros-Ibáñez, J.A. & Belmonte, J.F. & Molina, A.E., 2020. "Integration of absorption refrigeration systems into rankine power cycles to reduce water consumption: An economic analysis," Energy, Elsevier, vol. 205(C).

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