Forthcoming Articles

International Journal of Exergy

International Journal of Exergy (IJEX)

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International Journal of Exergy (7 papers in press)

Regular Issues

  • Financial Inclusion as a Catalyst for Reducing Social Entropy: Application of Thermodynamics   Order a copy of this article
    by Sabana Parveen, Souvik Dey 
    Abstract: This scientific research uses thermodynamic laws to model the relationship between Financial and Social inclusion in 113 nations (20052022). Unlike other models, it regards FII as economic energy, SII as the ordered state, and capital-labour ratio as economic temperature. Using two-stage PCA, we constructed the composite index of SII and FII then employed the neo-classical theory of Cobb-Douglas function and logit model to test three thermodynamic hypotheses. Results indicate that FII significantly boosts SII, particularly in middle-and low-income countries with rising returns to scale, and reduces SII variation (entropy), implying more stability. The Boltzmann-type pattern of high inclusion, tempered by FII and structural balance, provides new perceptions into equality, efficiency, and convergence.
    Keywords: Financial Inclusion; Social Inclusion; Thermodynamic Laws; Capital; Labor.
    DOI: 10.1504/IJEX.2026.10074164
     
  • Energy and Exergy Analysis of Solar Stills by using Single and Hybrid Nanofluid and Experimentally Determined Climatic Conditions   Order a copy of this article
    by Fatih Selimefendigil, Fethi Ahmet Çakmak, Hakan Fehmi Oztop 
    Abstract: In this study, the performance improvement of solar stills using different nanofluids was investigated analytically. Addition of CNTs to water (case 1), addition of Cu-Al2O3 nanoparticles (case 2) and addition of Al2O3-MWCNT-Graphene nanoparticles (case 3) were considered. By using binary nanofluid, 26.67% more water was obtained compared to the traditional distiller. Similarly, a 24.41% energy efficiency and 33.32% increase in exergy efficiency was achieved. Outcomes is useful for selection of appropriate hybrid nanoparticles in nano-enhanced solar stills as hybrid nanofluids in energy systems is considered due to the cost, stability and synergistic impacts of individual nanoparticles on the overall performance.
    Keywords: energy efficiency; nanofluid; nanoparticle; solar still; heat transfer.
    DOI: 10.1504/IJEX.2026.10074230
     
  • Recuperative Solar Organic Rankine Cycle a Comparative Parametric Analysis based on Energy and Exergy Approaches   Order a copy of this article
    by Nalluri Samuel, Dr Adusumilli Srinath, Venu M, Sharma Noble, T. Anup 
    Abstract: Thermodynamic analysis of 1 MW r-SORC with toluene (ORC fluid), therminol VP-1 (HTF) is conducted and heat source temperature (THTF,in), turbine operating parameters (pevp, T5) are optimized for exergetic efficiency maximization. This improved ?Sys,I and ?Sys,II by 17.87%, 179.91% respectively against study [1].Variation of ?OWF, ?HTF and ?Sys,I, ?Sys,II with respect to THTF,in are evaluated. Benefits accrued by operating r-SORC at exergy analysis based optimal conditions are: Improved performance of r-ORC i.e. ?r-ORC,I, ?r-ORC,II by 34.90%, 5.92% and the system i.e. ?r-Sys,I, ?r-Sys,II by 35.16%, 6.51% respectively, as against Nr-SORC[2]. ?HTF decreased by 0.79% and ?OWF increased by 0.05%.
    Keywords: energy; exergy; solar energy; recuperative organic Rankine cycle; thermal energy storage; stable power output; optimization.
    DOI: 10.1504/IJEX.2026.10074279
     
  • Energy Exergy and Environmental Analyses of Mango Leather Drying in Greenhouse Solar Dryer with Evacuated Tube Collector and Finned Tray   Order a copy of this article
    by Amit Shrivastava, Manoj Kumar Gaur, Parul Saxena 
    Abstract: This research evaluates the performance of a hybrid greenhouse solar dryer (HGSD) combined with an evacuated tube collector (ETC) for drying mango pulp. The experiments were conducted in June 2021 using a finned aluminium tray placed inside the drying chamber. The system demonstrated significant environmental advantages, including the mitigation of approximately 86.21 tons of CO2 emissions. The average exergy efficiency was 4.62%, with a corresponding sustainability index of 1.048. The energy payback period was calculated as 3.98 years, and the carbon credit earned $817.31. The findings highlight the system's potential for optimization to improve efficiency and sustainability.
    Keywords: Mango leather; energy balance; exergy balance; solar energy; greenhouse.
    DOI: 10.1504/IJEX.2026.10074718
     
  • Enhancing Performance by Incorporating Solar Feedwater Heating instead of Steam Bleeding of an Existing Steam Power Plant: Energy and Exergy Analyses   Order a copy of this article
    by Sayan Mandal, Sudip Simlandi, Nilkanta Barman 
    Abstract: This study presents energy and exergy analyses to improve the performance of a 500 MW thermal power plant by adding a direct solar feedwater heating system, rather than steam bleedings, resulting in a significant increase in energy efficiency. The energy efficiency increases from 44.33% to 48.50%, if off-bleeding is considered at the reheater inlet or at low- and intermediate-pressure turbines. A lower solar energy requirement of 134 MW is found when off-bleeding is established at the reheater inlet, but it demands an increase in temperature to 337.40C. The approach enhances energy efficiency and introduces a new concept.
    Keywords: Existing thermal power plant; reduce bleedings; direct solar heating; increasing efficiency; energy and exergy analyses.
    DOI: 10.1504/IJEX.2026.10075150
     
  • Investigating the Sectional Thrust and Exergy Efficiency of a Turbojet Engine   Order a copy of this article
    by Mustafa Akbas, Onder Altuntas, Arif Hepbasli 
    Abstract: This study delves into the performance characteristics of a turbojet engine, focusing on the impact of varying compressor pressure ratios and component geometries on thrust and exergy efficiency. The effects of Mach number and compressor pressure ratio on exergy utilisation efficiency at varying altitude values are also examined. Utilising the MATLAB, the analysis was conducted within a range of sea level to 12,000 m altitude. The results obtained provide valuable insights into the potential for optimising turbojet engine performance through strategic adjustments to pressure ratios and component geometries.
    Keywords: Exergy Analysis; Energy Analysis; Exergy Utilization Efficiency; Aeroengine Performance; Turbojet Engine.
    DOI: 10.1504/IJEX.2026.10075252
     
  • The History of the Universe: an Exergetic Study   Order a copy of this article
    by Birol I. Kilkis 
    Abstract: The cosmic age has been calculated as 13.819 Gyr, using the Second Law of Thermodynamics to predict a twin universe, and confirms the literature's age of 13.787 Gyr. The first exergy-based research addressing the cosmic age, published in this journal in 2004 and 2014, predicted a cosmic age of 14.885 Gyr. This paper resolves the age discrepancy by postulating a second epoch spanning between 14.885 Gyr and 13.819 Gyr, which connects the universe twins as a transition and transformation of the observable universe into its twin, following the same time arrow.
    Keywords: Cosmic age; Exergy flow; Twin universe; Radiating Universe Model; Second Law of thermodynamics.
    DOI: 10.1504/IJEX.2025.10075297
     

 

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