Forthcoming and Online First Articles

International Journal of Exergy

International Journal of Exergy (IJEX)

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International Journal of Exergy (14 papers in press)

Regular Issues

  • Thermodynamic Assessment of A Desalination System Integrated with Combined Cycle Power Plant via Throttling Process by Using a Vapour Compressor   Order a copy of this article
    by Ahmad Zikri, Muhsin Kilic 
    Abstract: This study aims to conduct a thermodynamic analysis of desalination system integrated with combined cycle power plant (CCPP), with a focus on the throttling process method combined with a steam compressor, the influence of pinch point temperature difference (PPTD) on distilled water production (specific aquadest production/SAP) and specific energy consumption (SEC). Reducing condenser pressure from 10.89 to 8.43 kPa and PPTD of 10 can increase steam turbine power by 2.18% and allow the wastewater temperature to drop to 32.5
    Keywords: electricity; freshwater; pinch point temperature difference; PPTD; specific aquadest production; SAP; specific energy consumption; SEC.
    DOI: 10.1504/IJEX.2025.10066839
     
  • Energetic and Exergetic Analysis of Multi-Energy Hybrid System Including Geothermal, Green Hydrogen, and Cold Energy Storage   Order a copy of this article
    by Gamze Soyturk, Onder Kizilkan 
    Abstract: This research delves into a thorough examination of a multi-energy system, combining geothermal energy, hydrogen (H2) generation, and cold energy storage. The system aims to establish an eco-friendly energy infrastructure by integrating these sustainable sources and storage methods. The study evaluates the system’s energy performance, scrutinising energy inputs, outputs, losses, and conversions across various components and subsystems. Furthermore, it conducts an exergy analysis to assess the effectiveness of energy transformations within the system, pinpointing areas of irreversibility and exergy dissipation. The findings reveal that the overall energetic efficiency stands at 11.31%, while the exergetic efficiency reaches 31.69%.
    Keywords: geothermal energy; green hydrogen; cold energy storage; energy; exergy.
    DOI: 10.1504/IJEX.2025.10067147
     
  • An Exergetic Performance Improvement Potential of a Modified Ejector-Enhanced Auto-Cascade Refrigeration Cycle   Order a copy of this article
    by Ibrahim Karacayli, Lutfiye Altay, Arif Hepbasli 
    Abstract: This study examines both conventional and advanced exergy analyses of a modified ejector-enhanced auto-cascade refrigeration (MEACR) cycle. Conventional exergy analysis shows that the proposed model significantly improves exergy efficiency compared to similar ejector-enhanced auto-cascade refrigeration cycles in the literature. Advanced exergy analysis reveals that 63.47% of the total exergy destruction is avoidable. When the components of the MEACR cycle are investigated, 56.31% of the exergy destruction is attributed to the endogenous part. The low-temperature cycle (LTC) compressor has the highest avoidable endogenous exergy destruction rate of 12.64 kW with 38.5%.
    Keywords: refrigeration; auto-cascade refrigeration; ejector; exergy analysis; advanced exergy analysis.
    DOI: 10.1504/IJEX.2025.10067148
     
  • Exergy based Design and Analysis of Spiral Circular and Square Coils for EV Wireless Battery Charging Application   Order a copy of this article
    by Balaji Subramanian, Thangavelu Anuradha 
    Abstract: This paper investigates the impact of misalignment on mutual inductance (MI) in wireless power transfer systems using spiral circular and square coils. Finite element analysis (FEA) and experimental validation compare the performance of square and circular geometry coils. Results show that square coils maintain higher mutual inductance under various misalignments, making them more suitable for practical applications. Experimental results validate simulation data, demonstrating the superiority of square coils for robust WIPTS. Analytical and FEM simulations show minimal error for both circular and square coil mutual inductance and coupling coefficients at 200m air gap, with square coils exhibiting superior exergetic efficiency.
    Keywords: electric vehicle; coupling co-efficient; wireless power transfer; mutual inductance; spiral circular; square coil.
    DOI: 10.1504/IJEX.2025.10067438
     
  • Exergoeconomic Analysis of the Utilisation of Microalgae Derived Biostimulants for Sustainable Agriculture   Order a copy of this article
    by Nicholas Melenek, Murilo Rampi, Jose Viriato Coelho Vargas, Gabriela Conor, Anne Oliveira, Andre B. Mariano, Juan Ordonez, Vanessa Kava 
    Abstract: This study addresses a biorefinery system that enables the production of microalgae derived biostimulants, which includes a municipal solid waste (MSW) incinerator, heat recovery steam generator (HRSG), an emissions fixation column, a photobioreactor, a flocculator, a centrifuge, and a dryer. The output is dry biomass to be utilised as fertiliser. The system technical and economic viability is investigated via an exergoeconomic analysis, which evaluates the systems performance accounting for energy consumption, exergy losses, and economic features related to each stage. The exergoeconomic evaluation established an exergetic cost of 1.022
    Keywords: agricultural practices; plant growth promoters; PGP; mathematical model; sustainability; cogeneration; exergy analysis; municipal solid waste.
    DOI: 10.1504/IJEX.2025.10067746
     
  • Exergy assessment on multi-evaporator cascade refrigeration system using R515B/R170 refrigerant pair: an experimental study   Order a copy of this article
    by Parthiban Kasi, M. Cheralathan 
    Abstract: This research explores the exergy analysis of a multiple evaporator cascade refrigeration system (MECRS), employing R515B for the higher temperature cycle and R170 for the lower temperature cycle. The MECRS achieves a maximum exergy efficiency of 28.27% and a minimum efficiency of 16.47% under both food storage and non-food storage conditions. Despite its lower exergy efficiency compared to conventional systems, the MECRS outperforms them in terms of coefficient of performance (COP) due to its utilisation of multiple evaporators in the low temperature circuit. According to this exergy analysis, refrigerant R515B is identified as the preferable choice for HTC, while refrigerant R170 is recommended as the better replacement for LTC.
    Keywords: cascade refrigeration; exergy analysis; exergy efficiency; R515B; R170; coefficient of performance; COP.
    DOI: 10.1504/IJEX.2024.10066428
     
  • Energy management in smart grids for optimal IoT integration with enhanced energy and exergy efficiencies using Garra rufa fish optimisation approach   Order a copy of this article
    by V.V. Rajasegharan, Bharatha Babu K, R. Jeyabharath, Vasan Prabhu V 
    Abstract: The day-to-day increased usage of power appliances by consumers is a growing concern. This manuscript presents an approach for IoT-based energy management in smart grid (SG) with proposed Garra rufa-fish optimisation (GRFO). The objectives of the proposed technique are to satisfy consumer energy demands while preserving energy-efficiency and minimising-cost. The GRFO algorithm optimises the consumption of energy to achieve optimal-energy in SG. The proposed method is analysed and compared to other existing-strategies in the MATLAB software. The proposed technique provides optimum outcomes in all existing PSO, WHO and HBO methods. The proposed method attains €0.015 cost. The result shows that the proposed method provides better results.
    Keywords: internet of things; IoT; distribution system; DS; shiftable loads; SLs; photovoltaic; wind turbine; energy management system.
    DOI: 10.1504/IJEX.2024.10066574
     
  • Evaluation of entropy generation in different microchannels and heat transfer properties in a triangular microchannel   Order a copy of this article
    by Brahim Kalech, Hana Ouri, Mourad Bouterra 
    Abstract: This study investigates the effects of nanoparticles in a water-based fluid on minimising entropy generation in a microchannel, with nanoparticle volume concentrations of 2% at 6%. The total entropy generation rates of nanofluids have been analysed in different cross-sectional shapes of microchannels. Nanofluid mixtures were studied under varying wall heat flux levels, and the total entropy generation rates were compared for three different types of nanofluids. This investigation introduces a model to calculate the dimensionless entropy generation for various duct cross-sections. The results indicate that the minimum total entropy generation value was observed for the nanofluid CuO-water with a concentration of 6% in the equilateral triangular cross-section duct.
    Keywords: microchannel; nanofluid; entropy generation; thermophysical properties; heat transfer; thermodynamic optimisation.
    DOI: 10.1504/IJEX.2024.10066744
     
  • A computer package to model wind speed distribution using six different methods including maximum entropy principle   Order a copy of this article
    by Muhammad Mustaqeem Zahid, Ahmed Ali Rajput, Shafiq Ur Rehman, Muhammad Adeel, Zaheer Uddin 
    Abstract: The Weibull probability distribution is widely used to model wind speed. In this study, a Python library package (windz) was developed to analyse wind speed data. This package includes various methods (method of the moment, empirical method, energy pattern factor method, maximum likelihood method, modified maximum likelihood method, and maximum entropy principle) to find the parameters of Weibull distribution. The package was used to model wind speed distribution for three years (2021-2023) in three cities of Pakistan: Harnai, Jacobabad and Talagang. The statistical errors goodness-of-fit test, including mean square, chi-square, and R-square errors, were used to check the fit's validity.
    Keywords: Python; wind speed distribution; Weibull distribution; maximum entropy principle; method of moments; maximum likelihood method; empirical method.
    DOI: 10.1504/IJEX.2024.10067018
     
  • Thermodynamic and economic evaluation of a developed solar-driven system for efficient production of power and cooling   Order a copy of this article
    by Ibrahim Alsaduni, Mohd Asjad Siddiqui 
    Abstract: This study proposes and evaluates the thermodynamic and economic aspects of a solar-powered combined power and cooling system. It comprises a solar tower collector, a supercritical carbon dioxide (s-CO2) power cycle, an organic Rankine cycle, and an absorption refrigeration cycle to meet building energy demands. The power and cooling outputs of the proposed combined system and its levellised cost of electricity (LEC) and efficiencies were analysed by varying parameters. Results show the highest energy and exergy efficiencies using toluene at 52.32% and 46.67%, respectively. Furthermore, the economic feasibility of the system design is supported by a LEC of ȼ8.856/kWh.
    Keywords: S-CO2 power cycle; organic Rankine cycle; ORC; absorption refrigeration cycle; solar tower collector; exergy; economic.
    DOI: 10.1504/IJEX.2024.10066573
     
  • Exergetic design and analysis of a freeze-out heat exchanger for helium purification   Order a copy of this article
    by Duncan Kroll, Nusair Hasan 
    Abstract: The freeze-out purification process is very effective in removing moisture contamination and can be utilised for purification of helium gas in cryogenic applications. A process model for a freeze-out helium purifier (up to 30 g/s of contaminated helium at 10 ppmv) with a coiled finned-tube heat exchanger is developed. An extensive 1st and 2nd law (exergy) analysis is carried out and the exergetically optimal heat exchanger configuration (diameter and number of flow passes) for a given heat exchanger surface area ranging from 42.5 m2 to 57.5 m2 are found.
    Keywords: gas purification; frost accretion; freeze-out; heat exchanger; cryogenics.
    DOI: 10.1504/IJEX.2024.10067091
     
  • Enhanced exergy analysis of the modified condensate gas treatment process   Order a copy of this article
    by Liqiong Chen, Cai He, Guoguang Ma 
    Abstract: This paper presents a comparative analysis of the process before and after the modification. Furthermore, the modified process was subjected to both conventional and enhanced exergy analysis. The results demonstrated a reduction in energy consumption and the number of main equipment units in the modified system. The primary source of exergy destruction within the system was the MDEA (N-Methyldiethanolamine) regeneration tower. The total destruction of the system is 39.23%, which could be mitigated by enhancing the efficiency of the components. The proposed measures aim to provide guidance for the reduction of exergy destruction in similar oil and gas treatment processes.
    Keywords: condensate gas treatment; energy consumption; enhanced exergy analysis; exergy destruction; improvement strategies.
    DOI: 10.1504/IJEX.2024.10067085
     
  • Exergy and emission analyses of a methanol fumigated dual-fuel engine employing biodiesel as a pilot fuel   Order a copy of this article
    by Krishnamani Selvaraj 
    Abstract: In this study, a single-cylinder direct ignition diesel engine was converted to a dual-fuel compression ignition engine, with methanol as the primary fuel and Gossypium herbaceum methyl ester (biodiesel) as the pilot fuel. In this work, the engine is operated as a dual-fuel engine by fumigating methanol into the intake air stream with different energy substitution percentages of 10%, 20%, and 30% using biodiesel as pilot fuel. The results indicate that with methanol fumigation, the exergy and fuel conversion efficiency reach a maximum of 49.84% and 31.58% with methanol fumigation of 30% 'energy substitution percentage' in the dual-fuel engine, which is comparatively higher than the conventional biodiesel reading.
    Keywords: methanol fumigation; biodiesel; dual-fuel engines; engine performance; exhaust emissions; exergy analysis.
    DOI: 10.1504/IJEX.2024.10067701
     
  • Design and analysis of a novel multi-generation plant utilising geothermal energy   Order a copy of this article
    by Fatih Yilmaz, Murat Ozturk, Resat Sebas 
    Abstract: This developed combined plant focuses on the thermodynamic and environmental impact analysis of clean and sustainable electricity, heating, green hydrogen, and distilled water production with geothermal energy. This work includes a double flashing geothermal cycle, a reheat CO2 Rankine cycle (re-tRC), a desalination unit (MED), and PEM electrolysis. Using energetic and exergetic efficiency methodologies, the system's performance changes are examined parametrically. The results are impressive: our system produces a net of 1,857 kW of electricity, and 28.33 kgs-1 distilled water. As a result, the system can produce 0.004595 kgs-1 of green hydrogen at 18.40% energy efficiency and 17.71% exergy efficiency.
    Keywords: energy; exergy; geothermal energy; hydrogen; transcritical cycle.
    DOI: 10.1504/IJEX.2024.10067254