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Numerical analysis of high temperature minichannel heat exchanger for recuperative microturbine system

Author

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  • Wajs, Jan
  • Kura, Tomasz
  • Mikielewicz, Dariusz
  • Fornalik-Wajs, Elzbieta
  • Mikielewicz, Jarosław

Abstract

Considering the development of energy sector, distributed small-scale power generation, e.g., gas micro-CHP, is attracting considerable interest. In such installations, the heat exchanger is one of the key components possessing a significant influence on overall performance. Most studies concentrate on units operating below 900 °C, which do not fulfil the requirements of gas micro-CHP. Therefore, there remains a challenge to design a compact heat exchanger with passive technologies of heat transfer enhancement. This work describes the implementation of the own construction of a plate minichannel heat exchanger for high-efficiency gas microturbine engines with an external combustion chamber, supplied with air at a temperature of about 1000 °C. The results of this study will greatly contribute to the increase of system efficiency. To understand transport phenomena occurring inside it, a numerical model of the entire heat exchanger was developed in OpenFOAM. Defined boundary conditions were based on experimental data used also to validate the numerical model. The pressure drop experimental and numerical results agreed within the 2%–14% range, while the heat rate ones – within the 1%–8% of the range. In addition, numerical analysis exhibited the limits of thermal and exergetic efficiency values possible to be obtained, when the boundary conditions are strongly controlled.

Suggested Citation

  • Wajs, Jan & Kura, Tomasz & Mikielewicz, Dariusz & Fornalik-Wajs, Elzbieta & Mikielewicz, Jarosław, 2022. "Numerical analysis of high temperature minichannel heat exchanger for recuperative microturbine system," Energy, Elsevier, vol. 238(PA).
    • Handle: RePEc:eee:energy:v:238:y:2022:i:pa:s0360544221019319
    DOI: 10.1016/j.energy.2021.121683
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    References listed on IDEAS

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    1. Zhang, Pan & Ma, Ting & Li, Wei-Dong & Ma, Guang-Yu & Wang, Qiu-Wang, 2018. "Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases," Energy, Elsevier, vol. 160(C), pages 3-18.
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    4. Wajs, Jan & Mikielewicz, Dariusz & Jakubowska, Blanka, 2018. "Performance of the domestic micro ORC equipped with the shell-and-tube condenser with minichannels," Energy, Elsevier, vol. 157(C), pages 853-861.
    5. Dariusz Mikielewicz & Krzysztof Kosowski & Karol Tucki & Marian Piwowarski & Robert Stępień & Olga Orynycz & Wojciech Włodarski, 2019. "Gas Turbine Cycle with External Combustion Chamber for Prosumer and Distributed Energy Systems," Energies, MDPI, vol. 12(18), pages 1-19, September.
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    Cited by:

    1. Li, Mingqiang & Ngwaka, Ugochukwu & Moeini Korbekandi, Ramin & Baker, Nick & Wu, Dawei & Tsolakis, Athanasios, 2023. "A closed-loop linear engine generator using inert gases: A performance and exergy study," Energy, Elsevier, vol. 281(C).
    2. Magdalena Piasecka & Artur Piasecki & Norbert Dadas, 2022. "Experimental Study and CFD Modeling of Fluid Flow and Heat Transfer Characteristics in a Mini-Channel Heat Sink Using Simcenter STAR-CCM+ Software," Energies, MDPI, vol. 15(2), pages 1-20, January.
    3. Daniarta, Sindu & Imre, Attila R. & Kolasiński, Piotr, 2022. "Thermodynamic efficiency of subcritical and transcritical power cycles utilizing selected ACZ working fluids," Energy, Elsevier, vol. 254(PA).
    4. Močnik, Urban & Čikić, Ante & Muhič, Simon, 2024. "Numerical and experimental analysis of fluid flow and flow visualization at low Reynolds numbers in a dimple pattern plate heat exchanger," Energy, Elsevier, vol. 288(C).

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