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Power, efficiency, ecological function and ecological coefficient of performance optimizations of irreversible Diesel cycle based on finite piston speed

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  • Wu, Heng
  • Ge, Yanlin
  • Chen, Lingen
  • Feng, Huijun

Abstract

By connecting the finite time thermodynamics and the finite speed thermodynamics, an irreversible reciprocating Diesel cycle model is established with considering the irreversibilities caused by finite piston speed, heat transfer, friction, and internal irreversible loss. Through numerical calculations, the relationships among net power output (P), thermal efficiency (η), ecological function (E), ecological coefficient of performance (ECOP) and compression ratio (γ), piston speed and piston speed ratio are analyzed. As it is shown in the results, the relation curves of P−γ, η−γ, E−γ, ECOP−γcharacteristics of the cycle are parabolic ones, and those of P−ηand E−ηcharacteristics of the cycle are loop-shaped ones. When piston speed ratio is a constant, the maximum net power output increases, the maximum ecological function first increases and then decreases, the maximum thermal efficiency and the maximum ecological coefficient of performance both decrease with the increase of piston speed. When piston speed is a constant, the maximum net power output and the maximum ecological function both first increase and then decrease, and the maximum thermal efficiency and maximum ecological coefficient of performance both decrease with the increase of piston speed ratio.

Suggested Citation

  • Wu, Heng & Ge, Yanlin & Chen, Lingen & Feng, Huijun, 2021. "Power, efficiency, ecological function and ecological coefficient of performance optimizations of irreversible Diesel cycle based on finite piston speed," Energy, Elsevier, vol. 216(C).
    • Handle: RePEc:eee:energy:v:216:y:2021:i:c:s0360544220323422
    DOI: 10.1016/j.energy.2020.119235
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    References listed on IDEAS

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    Citations

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    Cited by:

    1. Jin, Qinglong & Xia, Shaojun & Chen, Lingen, 2023. "A modified recompression S–CO2 Brayton cycle and its thermodynamic optimization," Energy, Elsevier, vol. 263(PE).
    2. Shuangshuang Shi & Yanlin Ge & Lingen Chen & Huijun Feng, 2021. "Performance Optimizations with Single-, Bi-, Tri-, and Quadru-Objective for Irreversible Atkinson Cycle with Nonlinear Variation of Working Fluid’s Specific Heat," Energies, MDPI, vol. 14(14), pages 1-23, July.
    3. Ge, Yanlin & Wu, Heng & Chen, Lingen & Feng, Huijun & Xie, Zhihui, 2023. "Finite time and finite speed thermodynamic optimization for an irreversible Atkinson cycle," Energy, Elsevier, vol. 270(C).
    4. Chen, Lingen & Xia, Shaojun, 2022. "Maximizing power output of endoreversible non-isothermal chemical engine via linear irreversible thermodynamics," Energy, Elsevier, vol. 255(C).
    5. Chen, Lingen & Xia, Shaojun, 2022. "Maximizing power of irreversible multistage chemical engine with linear mass transfer law using HJB theory," Energy, Elsevier, vol. 261(PB).

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