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Thermo-economic analysis of transcritical CO2 cycles with bounded and unbounded reheats in low-temperature heat recovery applications

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  • Mirkhani, Nima
  • Amini, Ali
  • Ashjaee, Mehdi

Abstract

Performance of transcritical CO2 Rankine cycles with and without reheat process is investigated thermo-economically in low-grade waste heat recovery applications. Two reheating scenarios are proposed to evaluate the effect of bounded and unbounded reheats on the cycle. In the first method, the constant available heat flow is distributed between the evaporator and the reheater via an optimized ratio, while in the second, the required energy for the reheat process is provided with optimized additional fuel consumption. The proposed cycles are modeled and optimized for source temperatures ranging from 150 to 300 °C at fixed flow rate of 1000 kg/s. The results obtained from thermodynamic optimization indicate that reheat cycle with burning additional fuel leads to the largest power generations ranging from 14 to 57 MW depending on the source temperature, while the reheat cycle with heat stream division shows the weakest performance by producing 8–37 MW. In the thermo-economic optimization, the ratio of power output to the cycle total bare module cost has been maximized. Under these conditions, the reheat cycle with burners still shows the highest rate of power production, while economic indicators limit the power generation and introduce the simple Rankine cycle as the best option.

Suggested Citation

  • Mirkhani, Nima & Amini, Ali & Ashjaee, Mehdi, 2017. "Thermo-economic analysis of transcritical CO2 cycles with bounded and unbounded reheats in low-temperature heat recovery applications," Energy, Elsevier, vol. 133(C), pages 676-690.
  • Handle: RePEc:eee:energy:v:133:y:2017:i:c:p:676-690
    DOI: 10.1016/j.energy.2017.05.162
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    Cited by:

    1. Aljolani, Osama & Heberle, Florian & Brüggemann, Dieter, 2024. "Thermo-economic and environmental analysis of a CO2 residential air conditioning system in comparison to HFC-410A and HFC-32 in temperate and subtropical climates," Applied Energy, Elsevier, vol. 353(PA).
    2. Cao, Yue & Rattner, Alexander S. & Dai, Yiping, 2018. "Thermoeconomic analysis of a gas turbine and cascaded CO2 combined cycle using thermal oil as an intermediate heat-transfer fluid," Energy, Elsevier, vol. 162(C), pages 1253-1268.
    3. Ramadan, Mohamad & Khaled, Mahmoud & Haddad, Ahmad & Abdulhay, Bakri & Durrant, Andy & El Hage, Hicham, 2018. "An inhouse code for simulating heat recovery from boilers to heat water," Energy, Elsevier, vol. 157(C), pages 200-210.
    4. Chowdhury, Jahedul Islam & Hu, Yukun & Haltas, Ismail & Balta-Ozkan, Nazmiye & Matthew, George Jr. & Varga, Liz, 2018. "Reducing industrial energy demand in the UK: A review of energy efficiency technologies and energy saving potential in selected sectors," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 1153-1178.
    5. Guo, Yumin & Guo, Xinru & Wang, Jiangfeng & Li, Zhanying & Cheng, Shangfang & Wang, Shunsen, 2024. "Comprehensive analysis and optimization for a novel combined heating and power system based on self-condensing transcritical CO2 Rankine cycle driven by geothermal energy from thermodynamic, exergoeco," Energy, Elsevier, vol. 300(C).

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