Forthcoming and Online First Articles

International Journal of Exergy

International Journal of Exergy (IJEX)

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International Journal of Exergy (11 papers in press)

Regular Issues

  • Comparative Energy and Exergy Analysis of Water-LiBr Absorption Chiller Configurations with Ejector Integration, and Implementation of Artificial Neural Network on the Optimal Selection   Order a copy of this article
    by Hamid-Reza Bahrami, Samane Fazli 
    Abstract: Refrigeration, a fossil fuel-intensive industry causing ozone depletion, is exploring energy-efficient alternatives like absorption chillers. Ejectors show promise in improving absorption chiller efficiency. Four ejector-assisted single-effect absorption chillers using LiBr as refrigerant were examined. The ejectors are used in different locations of the cycle in each configuration. Results reveal that Type D performs best (COP of 1.4 and lowest condenser heat rejection). The study also demonstrates the efficacy of artificial neural networks in accurately predicting cycle performance, which is useful for HVAC applications. Additionally, the genetic algorithm is employed to determine the optimal performance of the selected configuration.
    Keywords: ejector; absorption chiller; exergy; second law of thermodynamics; LiBr.
    DOI: 10.1504/IJEX.2024.10059737
     
  • Experimental Exergy Destruction Analysis of an Air to Air Heat Pump in Cooling Mode   Order a copy of this article
    by Hayati Tore, Ali Kilicarslan 
    Abstract: This experimental study investigates the destruction values of exergy of air source heat pump (ASHP) components with R404a refrigerant. The destruction values of exergy of the components were observed according to the atmospheric air temperatures between 24.8
    Keywords: air source heat pump; cooling; destruction of exergy; R404a.
    DOI: 10.1504/IJEX.2024.10060553
     
  • Assessment of exergy-based performance and sustainability indicators of a sewagewater source heat pump system   Order a copy of this article
    by Aysegul Gungor Celik, Arif Hepbasli 
    Abstract: Exergy analysis helps identify the amount and the positions of exergy losses in any system along with its main components. To achieve sustainability, these irreversibilities should be diminished. This study aims at presenting the exergetic-based performance of a sewage water source heat pump system based on experimental data. Initially, the exergetic performance assessments are carried out and then the exergetic performance results are evaluated using exergy-based sustainability indicators. The SWSHP system had the values for exergetic efficiency 57.7763.81% and overall sustainability index 2.312.72, respectively. Eight other exergy-based indicators are applied to determine and compare the most impacted component among the others.
    Keywords: advanced exergy analysis; enhanced exergy analysis; sewage water source heat pump; conventional exergy analysis; waste heat.
    DOI: 10.1504/IJEX.2024.10061106
     
  • Exergetic investigation and performance optimization of a supercritical power plant   Order a copy of this article
    by Mohammadreza Dalirazar, Mostafa Zakariapour, Iman Mazrouei Mangoodehi, Seyed Mahdi Mahnama, Abbas Rahdan, Reza Babaei 
    Abstract: The purpose of the present work is to optimise a supercritical power plant considering various natural gas extracted of Iran based on energy, exergy and environmental (3E) analysis. The results display that the optimisation is able to reduce the cost of emission (3.55%) and increase the energy and exergy efficiencies (1%). Also, the boiler is the major source of the destroyed exergy by 87%, followed the turbine by 7%. The present study shows that the gas extracted from the region of Khangiran is the best fuel due reduction of NOx and the cost of emission by 93.74% and 29.7%, respectively.
    Keywords: exergetic analysis; environmental analysis; steam power plant; natural gas; optimisation.
    DOI: 10.1504/IJEX.2024.10061731
     
  • Development and performance analysis of a solar-powered multigeneration plant with a reheat CO2 cycle for sustainable outputs   Order a copy of this article
    by Fatih Yilmaz 
    Abstract: In this research work, thermodynamic modelling and assessment are conducted to produce sustainable outputs using the energetic and exergetic efficiency approaches. The suggested cycle comprises a reheat carbon dioxide-based Brayton cycle for power production, a solar parabolic collector cycle, a Proton exchange membrane unit for hydrogen generation, a Reverse osmosis desalination unit for freshwater generation and a hot water generation process. The developed combined plant can provide 1131 kW of clean power and 0.001978 kg/s green hydrogen. Moreover, the entire irreversibility is computed as 8224 kW, in which the maximum irreversibility occurs in the solar collector. Finally, the developed multigeneration plant has 47.99% energetic performance and 17.14% exergetic performance.
    Keywords: energy; exergy; freshwater; green hydrogen; power; solar energy; multigeneration.
    DOI: 10.1504/IJEX.2024.10061824
     
  • Y shaped fins positioning effect on latent heat energy storage unit   Order a copy of this article
    by Abdeldjalil Belazreg, AISSA Abderrahmane, Mohammed Sahnoun, Zied Driss, Mohamed Salah Abid 
    Abstract: Phase transition materials (PCMs) store energy efficiently in latent heat thermal energy storage systems (LHTES). LHTES's key advantage is storing thermal energy and reducing temperature changes. Due to their poor heat conductivity, thermal performance improved. In the present investigation, Y-shaped fins with different position angles and nanoparticle concentrations were considered as investigating parameters to enhance the melting performance inside a vertical enclosure. The TES unit features wings and paraffin wax PCM with copper nano-additives. Cu concentrations (0%, 4%, and 8% by volume) and various angles of fins (60
    Keywords: Y-shaped fins; phase transition material; PCM; liquid fraction; melting process; thermal energy storage fin location; rectangular enclosure; numerical simulation; heat transmission.
    DOI: 10.1504/IJEX.2024.10062437
     
  • Thermodynamic Analysis of a Cascade Vapour Compression Refrigeration System Integrated Linde-Hampson Cycle   Order a copy of this article
    by Selcuk Kizilcaoglu, Ali Kilicarslan, Irfan Kurtbas 
    Abstract: The four-stage cascade vapor compression refrigeration system (CVCRS) integrated Linde-Hampson cycle (CVCRS-LH) is proposed in order to liquefy methane gas. The effects of isentropic efficiency of compressors, methane mass flow rate, evaporating and condensing temperatures on the performance of the four-stage CVCRS-LH and exergy efficiency are investigated with respect to the refrigerants R290, R600a and R161used in the fourth stage. The highest COP and exergy efficiency values were obtained by using R600a as refrigerant for all values of isentropic efficiency of compressors, methane mass flow rate, evaporating and condensing temperatures under the study in the fourth stage of the four stage CVCRS-LH.
    Keywords: vapour compression system; cascade refrigeration; refrigerants; Linde-Hampson; COP; exergy efficiency; exergy destruction.
    DOI: 10.1504/IJEX.2024.10062457
     
  • Enhanced Exergy Analysis of a Solar-Biomass Hybrid System for Micro-scale Combined Heat and Power Generation   Order a copy of this article
    by Mohammad Ali Sabbaghi  
    Abstract: This study investigates the thermodynamic performance of a cogeneration system activated by combining solar and biomass energies from an enhanced exergy analysis viewpoint. The results show that in the conventional exergy analysis, the biomass boiler has the highest exergy destruction with 79% of the total destruction. The results of the enhanced exergy analysis provide that the superheater has the highest portion of exergy destruction of the avoidable exogenous component. The share of exergy destruction in the endogenous avoidable part of the pump and the thermal storage tank is 69% and 55% higher than the values of other components, respectively.
    Keywords: cogeneration system; enhanced exergy analysis; biomass; solar; exergy destruction.
    DOI: 10.1504/IJEX.2024.10062626
     
  • Thermodynamic analysis of solar tower collector integrated with steam Rankine cycle, organic Rankine cycle and absorption refrigeration cycles for cogeneration of power and cooling   Order a copy of this article
    by Mohd Asjad Siddiqui, T. M. Yunus Khan 
    Abstract: A configuration of solar tower collector is developed to drive the proposed system integrated with steam Rankine cycle (SRC), organic Rankine cycle (ORC), and two absorption refrigeration cycles (ARCs) for power and cooling, and a thermodynamic analysis is performed. A detailed assessment of energy and exergy issues has been conducted in this paper. Results show that this study found the thermal efficiency of the system to be 70.87% for R123, 70.79% for R245fa, and 72.57% for toluene. Additionally, the exergy efficiency was obtained at 21.82% for R123, 21.51% for R245fa, and 28.79% when toluene is used as a working fluid.
    Keywords: absorption refrigeration cycle; ARC; energy; exergy; organic Rankine cycle; ORC; solar power tower; steam Rankine cycle; SRC.
    DOI: 10.1504/IJEX.2024.10062939
     
  • Exergy Analysis and Boiler Efficiency Enhancement of a Dairy Plant for Milk and Derivative Production   Order a copy of this article
    by Najwa Jbira, Anass Lebnaiti, Sanaa Hayani Mounir 
    Abstract: This paper presents an exergy analysis of a dairy plant in Beni Mellal/Khenifra, examining milk and derivative production. Exergy destruction rate and exergetic efficiency are calculated for each component of each process. The results indicate the boiler as the primary contributor to exergy destruction with a value of 6,402.40 kW, followed by the sterilisation line, the refrigeration system, the yogurt line and finally the pasteurisation line with percentages of 87.6%, 6.12%, 2.9%, 1.76%, 1.61%, respectively. To reduce boiler exergy loss, economiser design is proposed to recover waste heat. The design considers parameters like tube dimensions, count, passes, shell dimensions, and baffle thickness. The objective is cost-effective design with maximum performance. Optimisation led to substantial fuel savings, the economiser's initial cost was approximately $24,968 with payback period of only three months.
    Keywords: energy efficiency; exergy analysis; exergy destruction; dairy process; boiler efficiency; economiser design; energy saving; boiler performance.
    DOI: 10.1504/IJEX.2024.10062946
     
  • Comparative energy and exergy analyses of pumice and vermiculite based salt-in-matrix composites for low-grade thermochemical heat storage applications   Order a copy of this article
    by Abdullah Al-Ghosini, Devrim Aydin 
    Abstract: Thermochemical heat storage (THS) is a promising technology for enhancing renewable energy utilisation, with thermochemical materials (TCMs) playing a pivotal role in THS performance. This study aims to experimentally evaluate the cyclic thermodynamic performance of nine different composite TCMs based on pumice and vermiculite. According to the results, V-LiCl achieved the highest four-cycle average energetic efficiency of 74%, followed by P-CaCl2-LiCl with 70%. Peak exergetic efficiency was obtained with V-LiCl at 17.5% in the first cycle, which gradually dropped to 5.5% in the fourth cycle. Based on the testing results, pumice-based TCMs showed more stable hygro-cyclic and exergetic efficiency.
    Keywords: thermochemical heat storage; THS; salt in matrix; pumice; vermiculite; sorption; energy and exergy; experimental analyses; energy storage density; composite sorbent.
    DOI: 10.1504/IJEX.2024.10062981