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A combined cooling and power transcritical CO2 cycle for waste heat recovery from gas turbines

Sabzpoushan, S ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.tsep.2022.101423
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. A transcritical carbon dioxide (T-CO2) cycle is analyzed for waste heat recovery from a gas turbine. The cycle is proposed to produce combined power and cooling using carbon dioxide as a single pure working fluid. Simple, cascade and split cycle configurations are compared for power generation using a recuperator while a low-temperature loop is added for the cascade and split cycles. In a previous report in the literature the power generation part alone was presented for the three configurations and it was concluded that the split cycle can produce the highest power among the three systems. Here, the same configurations are studied combined with a compression refrigeration cooling effect with the same working fluid, and a parametric study is conducted. The power cycle is a T-CO2 cycle which absorbs the waste heat from a gas turbine. The effect of different parameters like cooling load, splitters mass fractions, turbine pressure and condenser pressure are investigated and a comparison between the three configurations are demonstrated. It is shown that, for instance, in case of higher temperatures of gas turbine exhaust the split configuration has the highest net power production while using gas turbine exhaust flow of temperatures less than 420 °C the simple configuration produces the maximum output power. From the cooling perspective, for values of turbine inlet pressure higher than 222 bar, abs. the cascade cycle indicates the best cooling performance while the split one takes this position at lower turbine inlet pressures. © 2022 Elsevier Ltd
  6. Keywords:
  7. Cogeneration ; Cycle efficiency ; Waste heat recovery ; Cooling ; Gas turbines ; Gases ; Rankine cycle ; Temperature ; Waste heat ; Waste heat utilization ; Combined cooling ; Combined cooling and power ; Power ; Recuperation ; Simple++ ; Transcritical carbon dioxide ; Waste-heat recovery ; Working fluid ; Carbon dioxide
  8. Source: Thermal Science and Engineering Progress ; Volume 34 , 2022 ; 24519049 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S2451904922002293