Deleted Journal, Journal Year: 2025, Volume and Issue: unknown, P. 100084 - 100084

Published: Jan. 1, 2025

<p>Thermodynamic graphical methods are useful tools for visualizing thermodynamic state equations and widely applied in the design optimization of systems. However, integration renewable energy thermal storage systems introduces finite heat capacity characteristics, resulting continuous dynamic variations system performance, which poses challenges to existing methods. To accurately describe performance under boundary conditions, this study investigates analysis characteristics Energy-Energy (<i>E</i>-<i>E</i>) diagram. Based on ideal gas model, mathematical expressions mechanical derived, systematic comparisons between <i>E</i>-<i>E</i> Temperature (<i>T</i>)-Entropy (<i>s</i>) diagrams conditions conducted, elucidating intrinsic relationships among geometric parameters, initial performance. Through parametric analysis, we reveal that increasing reservoir temperature from 500 K <styled-content style-type="number">1500</styled-content> enhances conversion potential, with rotation angle 20.77° 37.15°. Additionally, cold ratio results a decreased angle, indicating lower efficiency. The diagram achieves visualization by analogizing processes rotational motion radius circle. Compared <i>T</i>-<i>s</i> diagram, it employs lines slopes instead areas area ratios, exhibiting advantages analyzing varying conditions. This complementary coupling provides new perspective describing systems.</p>

Language: Английский