Effect of non-ideal gas working fluid on power and efficiency performances of an irreversible Otto cycle

Di Wu; Yanlin Ge; Lingen Chen; Lei Tian

doi:10.1515/jnet-2023-0036

Published by De Gruyter September 7, 2023

Effect of non-ideal gas working fluid on power and efficiency performances of an irreversible Otto cycle

Di Wu , Yanlin Ge , Lingen Chen and Lei Tian

From the journal Journal of Non-Equilibrium Thermodynamics

https://doi.org/10.1515/jnet-2023-0036

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Abstract

Based on the irreversible Otto cycle model, applying finite-time-thermodynamic theory, this paper takes power and efficiency as the objective functions, further studies the cycle performance under the condition of non-ideal gas working fluid, analyzes the effects of different loss items and freedom degree (d) of monatomic gas on the cycle performance, and compares performance differences of ideal gas and non-ideal gas under different specific heat models. The results demonstrate that, with the increase of d, the maximum-power-output (P _max), the maximum-thermal-efficiency (η _max), the corresponding optimal compression-ratio ( ( γ opt ) p ) and efficiency (η _P) at the P _max point, and the corresponding optimal compression ratio ( ( γ opt ) η ) and power (P _η) at the η _max point will all increase; the P _max, ( γ opt ) p , η _max, ( γ opt ) η , η _p and P _η will decrease with the increases of three irreversible losses; the specific heat model has only quantitative effect on cycle performance but no qualitative effect; under condition of non-ideal gas specific heat model, the power and efficiency are the smallest.

Keywords: irreversible Otto cycle; power; efficiency; non-ideal gas; finite-time-thermodynamics

Corresponding author: Lingen Chen, Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan, 430205, P.R. China; Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment, Wuhan 430205, P.R. China; and School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, Wuhan, 430205, P.R. China, E-mail: lingenchen@hotmail.com

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Competing interests: The authors declare no conflicts of interest regarding this article.
Research funding: This work is supported by the National Natural Science Foundation of China (Project Nos. 52171317 and 51779262) and Graduate Innovative Fund of Wuhan Institute of Technology (Project No. CX2022072). The authors wish to thank the reviewer for careful, unbiased, and constructive suggestions, which led to this revised manuscript.

Nomenclature

B: heat-transfer-loss coefficient (W/K)
C _v: specific heat at constant volume (J/(mol K))
d: freedom degree of monatomic gas
M: molar flow rate (mol/s)
P: power output (W)
Q: heat-transfer rate (W)
T: temperature (K)

Greek symbols
γ: compression-ratio (–)
η: thermal efficiency (–)
η _c: compression-process efficiency (–)
η _e: expansion-process efficiency (–)
μ: friction-coefficient (–)

Subscripts
In: input
leak: heat leak
max: maximum
out: output
0: environment
1–4, 2s, 4s: cycle state points

Abbreviations
FTT: finite time thermodynamics
OC: Otto cycle
POW: power output
SH: specific heat
TEF: thermal efficiency
WF: working fluid

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Received: 2023-04-13

Accepted: 2023-08-24

Published Online: 2023-09-07

Published in Print: 2023-10-26

Effect of non-ideal gas working fluid on power and efficiency performances of an irreversible Otto cycle

Abstract

Nomenclature

References

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