Forthcoming and Online First Articles

International Journal of Exergy

International Journal of Exergy (IJEX)

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International Journal of Exergy (9 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
     
  • 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
     
  • Impact of support pillars geometry on thermal insulation performance of vacuum glazing: CFD research and exergy analysis   Order a copy of this article
    by Pinar Mert Cuce, Erdem Cuce, Harun Sen 
    Abstract: Vacuum glazing technology is based on evacuating the gas between the double glass and aims to prevent heat losses by eliminating convection effects. This study evaluates the effect of thermal conductivity and column design on the window heat transfer coefficient with a 2D CFD study, taking 200
    Keywords: vacuum glazing; heat transfer coefficient; support pillar design; thermal resistance; exergy analysis.
    DOI: 10.1504/IJEX.2024.10063157
     
  • Performance Evaluation of Geothermal Assisted VAC Systems for Residential Cooling Purposes   Order a copy of this article
    by Nurdan Yildirim 
    Abstract: Nowadays renewable energy sources are being integrated to HVAC-R system to reduce energy consumption of the buildings since buildings have the biggest share of the total energy consumption of nearly every country in the World. In this study, a geothermal assisted cooling system with a vapour absorption refrigeration system having ammonia water or lithium bromide-water solution pair is studied in order to meet 10 kW cooling demand of a 150 m2 detached house in Izmir, Turkey. The thermodynamic performances of the refrigeration systems are compared by conducting detailed energy, exergy analyses and parametric studies. The exergetic efficiency of the lithium bromide-water vapour absorption refrigeration system is determined as 30%, while it is 19.8% for ammonia-water vapour absorption refrigeration system. The vapour absorption refrigeration system with lithium bromide-water working pair is a better alternative for the considered house at the base case operating conditions.
    Keywords: geothermal cooling; building; VAC; performance assessment; exergy analysis.
    DOI: 10.1504/IJEX.2024.10063643
     
  • An exergy-based efficiency analysis framework for industrial pneumatic systems   Order a copy of this article
    by Zecheng Zhao, Zhiwen Wang, Hu Wang, Rupp Carriveau, David S-K. Ting, Wei Xiong 
    Abstract: Pneumatic systems are widely used in industrial production. It is valuable to conduct detailed analyses on pneumatic systems in the interest of improving their energy performance. In this study, an exergy-based efficiency analysis framework is proposed for industrial pneumatic systems. The product exergy, fuel exergy, and exergy efficiency of various pneumatic components are clearly defined. The exergy sensors and exergy analysis toolbox are developed in the software AMESim. Finally, both simulation and experiment of a typical pneumatic system are conducted and compared to validate the feasibility of the proposed exergy-based efficiency analysis framework.
    Keywords: pneumatic; exergy; energy saving; exergy efficiency; compressed air.
    DOI: 10.1504/IJEX.2024.10063645