Performance comparison of internal reversible Rallis cycles at maximum effective power and maximum power
XUE Xiaoqing
GE Yanlin
CHEN Lingen
FENG Huijun
Abstract：Based on the internally reversible Rallis cycle model,the performance characteristics of it under the effective power(Ep)target are studied,and the analytical formula of Ep is derived.The isothermal process expansion ratio(σ)is taken as the optimization variable to analyze the influences of compression ratio(ε),pressurization ratio(λ),pre-expansion ratio(ρ),and heat transfer loss(B)on the cycle performance.And compare the performance differences of the cycle under the Ep and power(P)targets.The results showed that the cyclic relationship curve between Ep and σ presents a parabolic shape,σ is the best value(σEp)make cycle Ep to achieve the maximum(Ep)max.The relationship curve between the cyclic Ep and efficiency(η)presents a twisted leaf shape that returns to the origin.When ε,λ and ρ increase while B decreases,(Ep)max and its corresponding efficiency(ηEp)increase.When other conditions are constant,the η corresponding to the maximum Ep of the cycle is greater than that corresponding to the maximum P.When Ep is selected as the objective function,the loop can achieve an efficiency improvement at the expense of less power.
Keywords：finite-time thermodynamicsinternal reversible Rallis cycleseffective powerheat transfer lossperformance comparison
Publication Date：2025-12-25
Online Publishing Date：2026-01-26(First online date of this platform, not the publication date of the document)
Pages：5( 43-47 )