Forthcoming Articles

International Journal of Exergy

International Journal of Exergy (IJEX)

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International Journal of Exergy (6 papers in press)

Regular Issues

  • Energy and Exergy Analysis of a Solar Air Collector with Evacuated Tubes under Different Flow and Reflector Configurations   Order a copy of this article
    by Nitin Panwar, Rajesh Attri 
    Abstract: This study investigates the energy and exergy performance of a solar air collector (SAC) integrated with evacuated tubes under varying air flow rates and reflector configurations. Experiments conducted from 08:0018:00 h showed outlet air temperatures up to 105.2. This study investigates the energy and exergy performance of a solar air collector (SAC) integrated with evacuated tubes under varying air flow rates and reflector configurations. Experiments conducted from 08:0018:00 h showed outlet air temperatures up to 105.2C. Energy efficiency ranged between 3571%, while exergy efficiency varied from 2.165%. Exergy input, output and loss averaged 104.6, 3.0 and 101.6 kJ/kg, respectively. Efficiency decreased near midday but improved later. Overall, the reflector-assisted high-flow system demonstrated superior thermal and exergy performance, highlighting its potential for sustainable and efficient solar air heating applications.
    Keywords: Evacuated tube; Solar air collector; Thermal Performance; Exergy; flow rates.
    DOI: 10.1504/IJEX.2026.10075494
     
  • Exergy, Energy, and Exergoeconomic Assessment of a Solar Based Novel Power Generation System using Helium Brayton Cycle   Order a copy of this article
    by Achintya Sharma, Anoop Shukla, Onkar Singh, Meeta Sharma 
    Abstract: This study presents a novel solar power tower (SPT)-based power plant integrating a helium Brayton cycle (HBC) as the topping cycle and a recuperative organic Rankine cycle as waste heat recovery cycle. Energy, exergy, and exergoeconomic analyses were performed numerically. Results demonstrate that the proposed system achieved improvements of 19.86% in energy efficiency and 19.85% in exergy efficiency, however, at a 9.41% increase in overall plant cost compared to the conventional SPT-HBC configuration. Therefore, the proposed system achieved energy and exergy efficiencies of 34.45% and 36.89%, respectively, and a levelised cost of electricity of 43.23 $/MWh.
    Keywords: solar power tower; recuperative ORC; working fluid selection; helium Brayton cycle; exergoeconomic analysis.
    DOI: 10.1504/IJEX.2026.10075560
     
  • Exergy and Energy Performance Analysis of Hybrid Photovoltaic Thermal (PVT) Systems for Sustainable Energy Transition   Order a copy of this article
    by Areeba Rehman, Naeem Abas, Muhammad Shoaib Saleem 
    Abstract: The rising global energy demand and reliance on fossil fuels intensify climate change, urging renewable integration. This study investigates a hybrid photovoltaic thermal (PV/T) system installed at University of Gujrat, modelled in TRNSYS under Lahore's semi-arid climate. The system simultaneously generated electricity and thermal energy, with peak electrical output and energy gain in September, and maximum collector efficiency of 43.23% in August. The annual average efficiency was 10.63%. Results confirm the technical viability of PV/T systems as a sustainable solution for combined heat and power generation in regions with high solar insolation.
    Keywords: Hybrid renewable energy; Photovoltaic thermal; Sustainability; TRNSYS simulation.
    DOI: 10.1504/IJEX.2026.10076688
     
  • A Novel Hybrid Experimental-ANN Framework for Thermo-Exergetic Evaluation of Salinity Gradient Solar Ponds   Order a copy of this article
    by Yasin Özcan, Emrah Deniz, Mehmet Gürdal, Ismail Ekmekçi 
    Abstract: In the hybrid experimental study conducted, the thermal and exergy performance of a salinity gradient solar pond (SGSP) was tested under real outdoor conditions and later neural network (ANN) method was developed to predict temperatures at various depths of the pond. The SCG algorithm was used in the optimised ANN model. The highest thermal efficiency was found to be around 20.68%, and the exergy efficiency was close to 0.81%. The ANN model performed well, reaching an average R2 value above 0.998. These outcomes show that the proposed model can successfully forecast pond temperatures with high reliability.
    Keywords: Salinity gradient solar pond; Energy and Exergy analyses; Machine Learning.
    DOI: 10.1504/IJEX.2026.10076841
     
  • Design, Exergy Analysis, and Heat Transfer Investigation of a New Automotive Brake Disc   Order a copy of this article
    by Mohamed Ben Jamel Hadder, Ahmed Ghorbel, Fathi Djmal, Mohamed Haddar, Mounir Baccar 
    Abstract: This study investigates the thermal behaviour of four brake disc geometries using Computational Fluid Dynamics (CFD). A Standard Full Rotor (SFR), a Standard Radial Vane rotor (SRV-R), a Circular Pillar design (CP), and a novel Y-shaped disc with cooling fins are analysed under identical braking conditions. In addition to heat distribution and airflow characteristics examination, an exergy analysis is conducted to identify the most efficient configuration. Results indicate that the Y-shaped design delivers superior cooling with 20%-30% lower heat build-up and reduce exergy destruction, demonstrating its clear thermodynamic advantage for enhancing braking performance and safety.
    Keywords: Brake disc; Exergy; Heat transfer; SFR; SRV-V; CP; Y-shaped disc.
    DOI: 10.1504/IJEX.2026.10077235
     
  • EXPERIMENTAL PERFORMANCE AND ENHANCED EXERGY ANALYSIS OF A DOMESTIC REFRIGERATOR   Order a copy of this article
    by Samuel Oyedepo 
    Abstract: Experimental performance and enhanced exergy analysis of a domestic refrigerator is carried out in this study using pure LPG and LPG/R134A blends as refrigerants. The investigation was carried out under natural and forced convection conditions. Results of the study show that the least exergy destruction of 0.53 kW was recorded when LPG/R134A (50:50) blend was used under forced convection. On the component-wise exergy-analysis, the evaporator has the highest exergetic efficiency (40.695.4%) for all the refrigerants used. This study reveals existence of strong interconnections among the components. Also, the endogenous avoidable is much higher than the exogenous avoidable exergy destruction for all components.
    Keywords: Enhanced exergy; exergetic efficiency; irreversibility; endogeneous exergy destruction; exogeneous exergy destruction.
    DOI: 10.1504/IJEX.2026.10077323
     

 

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