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Exergy Efficiency Research Articles

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11676 Articles

Published in last 50 years

Related Topics

  • Exergetic Efficiency
  • Exergetic Efficiency
  • Law Efficiency
  • Law Efficiency
  • Total Exergy
  • Total Exergy
  • Exergy Destruction
  • Exergy Destruction

Articles published on Exergy Efficiency

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Experimental study of exergy efficiency, rheological behavior, thermal performance, and entropy generation/destruction in graphene-ZrO2/water hybrid nanofluids

ABSTRACT The present investigation established the heat transfer coefficient, thermal and frictional entropy generation, entropy destruction, exergy efficiency, dynamic viscosity, and thermal performance of G-ZrO2/water nanofluid. The two-step fabrication method developed the hybrid nanofluid with distinct particle loading ϕ = 0.0%, 0.05%, 0.75%, 0.1%, and 0.125% and Reynolds numbers ranging from 2000 to 23,200. As a result, the increases in Nu and hnf are 33.03% and 59.4% for particle loading ϕ = 0.125% at Reynolds number (Re) 15,608, respectively. Moreover, the temperature variance decreases from 31.06% to 61.63% as the particle loading of ϕ = 0.125 is modified at Reynolds numbers 2000–15,608, respectively. The friction factor increases by 5.089% at Reynolds number (Re) 2456 and particle loading ϕ = 0.125%, increasing to 16.52% at higher Reynolds numbers than base fluid. Similarly, with a Re number of 15,608 and 1.0% volume of nanofluid, the development of frictional entropy (Sg, F) increases by 94.23% while the production of thermal entropy (Sg, T) decreases by 33.61%. Similarly, the higher reduction in thermal exergy destruction (Exdes, T) and increases of frictional exergy destruction (Exdes, F) value of 20.46% and 158.097% were observed at Re number Re = 23255 for higher particle loading of ϕ = 0.125%. Moreover, the exergy efficiencies demonstrated improvements of 11.76%, 15.38%, 19.84%, and 20.58% at Re of 23,255, 21023, 18058, and 15,608, respectively, in assessment to the distilled water. The TPF is 1.252 times higher than the base fluid, demonstrating the favorable characteristics of G-ZrO2/water nanofluids as heat transfer hybrid nanofluids.

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  • Journal IconExperimental Heat Transfer
  • Publication Date IconMay 14, 2025
  • Author Icon Pradeep Kumar Singh + 8
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Exergy Assessment and Exergetic Resilience of the Large-Scale Gas Oil Hydrocracking Process

Fossil fuels remain essential to the world’s energy supply, but the decline in the quality of the oil extracted has increased the relevance of processes such as hydrocracking. Despite its potential, this process involves high energy consumption. In order to assess its efficiency, an exergy analysis of a conventional hydrocracking unit was carried out using Computer Aided Process Engineering (CAPE) tools. After simulations, the physical and chemical exergies of the input and output streams were calculated, which showed a remarkable energy efficiency of 98.76%, attributable to the high exergy content of the products obtained (171,243,917.70 MJ/h) compared to the residues generated (1,065,290.8 MJ/h). The most significant irreversibilities were found in the Recycle Gas Sweetening stage, while the lowest exergy efficiency, 87.16%, was observed in the Residual Gas Sweetening phase. By valorizing the waste, the overall efficiency of the process increased to 99.26%, which allowed for a 40% reduction in the total irreversibilities. Optimization of the stages with the highest unavoidable losses and better energy integration of the process are suggested to maximize its performance.

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  • Journal IconSci
  • Publication Date IconMay 12, 2025
  • Author Icon Luisa José Acosta-Esalas + 1
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Exergoeconomic Analysis and Optimization of a Combined Cooling, Heating, and Power System Based on a Super-Trans-Subcritical Regenerative Cycle Using the Liquefied Natural Gas Cold Energy and Steam Methane Reforming Waste Heat

Abstract This article designs and analyzes a combined cooling, heating, and power system based on the step utilizing liquefied natural gas cold energy and steam methane reforming flue gas waste heat. The system performance is evaluated through thermodynamic analysis, exergoeconomic analysis, and multi-objective optimization of the system. The influence of the turbine inlet pressure P4, split ratio x, and mole fraction of carbon tetrafluoride NR14 on the system performance is analyzed. The results show that increasing P4 and T10 can improve the net work output, the thermal efficiency, the exergy efficiency, and lower the average unit cost. Reducing x, P14, and NR14 can reduce the average unit cost, and improve the exergy efficiency. The system energy is mainly distributed in the heat exchangers. In the actual optimal state, the thermal efficiency, exergy efficiency, and average unit cost of the system are 72.35%, 52.16%, and 31.24 $/GJ, the annual net economic value is 1.507 × 106 $, and the discounted payback period is 3.38 years. The research results are conducive to capturing carbon dioxide from flue gas, saving resources, and protecting the environment.

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  • Journal IconJournal of Thermal Science and Engineering Applications
  • Publication Date IconMay 7, 2025
  • Author Icon Changshun Wang + 5
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Comprehensive investigation of rooftop photovoltaic power plants with monocrystalline polycrystalline and thin-film technologies for exergy economic and environmental assessments

This research aims to conduct an exergy, economic, and environmental analysis of a 6.57 kWp rooftop photovoltaic (PV) power plant that combines different PV technologies, comprising 2 kWp of poly-crystalline (p-Si), 1.87 kWp of mono-crystalline (m-Si), and 2.7 kWp of thin-film amorphous silicon (a-Si) technologies. A comprehensive assessment was conducted to evaluate the environmental and techno-economic parameters of a PV plant system. This study is based on the performance data obtained over four years of energy production under the weather conditions of Kuala Lumpur, Malaysia. The embodied energy required for the manufacturing of the PV power plant was estimated using embodied energy indices available in the literature. Additionally, a detailed economic evaluation was conducted based on the electricity costs in Malaysia. Moreover, the environmental impact was assessed over the plant’s life cycle, considering the emission factors of coal power plants. Results indicate that the exergy payback time for the different technologies i.e., m-Si, p-Si, a-Si, when operated individually, and when combined within a single PV system, are found to be ~ , and years, respectively. Over its life cycle, it was found that the PV plant emits about . Emission breakdown analysis has revealed that the manufacturing process of the m-Si, p-Si, a-Si, and the monitoring systems contribute to , , , and of emissions, respectively. However, the PV power plant could offset about annually, equivalent to the emission of a car over approximately 3 years. This study offers critical insights into the exergy efficiency, environmental impact, and economic viability of a grid-connected rooftop PV power plant that integrates multiple PV technologies under tropical climate conditions.

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  • Journal IconScientific Reports
  • Publication Date IconMay 3, 2025
  • Author Icon Abdelhak Lekbir + 6
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Heat transfer enhancement of a solar air heater using capsule-shaped turbulators: a numerical analysis

The development of a laminar sublayer inside the channel of the solar collector results in a poor heat transfer coefficient. Adding artificial roughness to the absorber plate in the form of turbulators is an effective and promising method of increasing heat transmission by interrupting the laminar sublayer. In this study, a capsule-shaped turbulator is used to enhance the thermal performance of the solar air heater. With flow Re (Reynolds number) fluctuating from 3000 to 21,000, the flow and heat transfer-related parameters of an air heater fitted with turbulators were numerically examined. The orientation angle of the capsule turbulator corresponding to the flow direction is modified from 0° to 90° in steps of 15°. The outcomes indicated that the overall thermal performance of the solar collector was optimized for the orientation angle of 45° at all the Reynolds numbers chosen for the study. Beyond this angle, the turbulators block the flow, increasing the pumping power. The number of rows of turbulator, pitch and height ratios of the optimized turbulator design is varied in the range of 1–3, 0.025–0.25 and 0.004–0.008, respectively, to determine their optimum values for better performance. It is observed that the turbulator having two rows with a pitch ratio of 0.05 and height ratio of 0.006 produces a relatively higher overall thermal enhancement by about 15.76% when compared with the base model without turbulators. The same configuration yields about 52.64% improvement in the exergy efficiency with respect to the base model.

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  • Journal IconScientific Reports
  • Publication Date IconMay 2, 2025
  • Author Icon N Madhwesh + 2
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Influence of operational modes on the system performance and exergy efficiency of carbon fiber film heater-assisted heat pump drying systems

Influence of operational modes on the system performance and exergy efficiency of carbon fiber film heater-assisted heat pump drying systems

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  • Journal IconThermal Science and Engineering Progress
  • Publication Date IconMay 1, 2025
  • Author Icon Ahmet Yüksel + 2
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Exergy Analysis of Heat Pump Polygeneration System

ABSTRACTEnvironmental degradation and sustainable development are currently two of the most significant global challenges. Among these, producing drinking water, chill air, hot air, and expanding renewable energy methods are paramount. The effective use of advanced technology to produce multiple outputs has demonstrated itself to be a reliable, affordable, and competitive approach to energy generation. Polygeneration technologies' high productivity stems from their ability to recover energy that would otherwise be wasted. So, this study aims to combine the solar‐powered heat pump/VCR with a humidification, dehumidification, and desalination cycle for polygeneration. In order to minimize the thermal pollution from this system, waste heat from the VCR's condenser has been recovered and utilized to produce hot water and fresh water along with a cooling effect. The investigation evaluates the effect of seawater temperature, humidifier efficiency, relative humidity, and the surrounding temperature on the performance factors, that is, thermodynamic and exergy analysis. A mathematical model has been simulated using MATLAB, yielding key performance metrics: a gained output ratio of 1.909, a coefficient of performance of 1.724, a thermal performance factor of 3.786 for the cycle and 0.565 for the plant, and an exergy efficiency of 27.52%. These results highlight the potentiality of the heat pump polygeneration system in providing sustainable and efficient solution for domestic needs.

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  • Journal IconHeat Transfer
  • Publication Date IconApr 30, 2025
  • Author Icon Vajeer Baba Shaik + 2
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Multi-Objective optimization of a parabolic trough solar power plant integrated with an organic Rankine cycle: based on high pressure and working fluid mass flow rate

The optimization of a parabolic trough solar power plant is conducted using a multi-objective optimization algorithm in this study. Initially, the design of the plant, planned to be built in Afyonkarahisar province, is developed. Thermodynamic and thermo-economic analyses are performed based on this design. Key variables significantly affecting the system's outputs are identified as the fluid flow rate used in the Organic Rankine Cycle (ORC) and the turbine inlet pressure. A parametric study is carried out for these variables. However, optimizing the system requires more than just these parameters. The system is optimized multi-objectively, considering all relevant variables. A graphical multi-objective optimization algorithm is applied in this process. For the base case values of a 30 kg/s flow rate and 3500 kPa turbine inlet pressure, the net energy production, exergy efficiency, and unit energy cost are 0.8443 MW, 2.32%, and 0.2230 $/kWh, respectively. After optimization, the best results are achieved at a flow rate of 42 kg/s and a pressure of 4000 kPa. For the optimized case, the net energy production, exergy efficiency, and unit energy cost improve to 1.228 MW, 3.37%, and 0.1781 $/kWh, respectively.

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  • Journal IconInternational Advanced Researches and Engineering Journal
  • Publication Date IconApr 29, 2025
  • Author Icon Ömer Faruk Güler
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Thermodynamic and technoeconomic feasibility assessment on liquefaction of CO2 by-product of Afyon biogas power plant

The composition of the biogas produced in Afyon biogas power plant is approximately as follows: 55% CH4 (methane) - 40% CO2 (carbon dioxide)- 4.5% H2O (water) and trace amounts of other components. The methane produced is used in gas engines to generate electricity. Carbon dioxide, however, increases greenhouse gas emissions when released into the atmosphere. The model designed in this study includes the liquefaction and storage of CO2 and the technoeconomic analysis of this process. The analysis was performed in the Aspen Plus software, which is widely used in the analysis of complex processes involving numerious chemical reactions. According to the results of the thermodynamic analysis, the energy efficiency, exergy efficiency, net electrical power and liquid CO2 production rate of the plant were determined as 14.92%, 13.08%, 4,000 kW and 99 kg/h, respectively. According to the results of the technoeconomic analysis, unit electricity cost, liquid CO2 flow cost and TCC (total capital cost) are 77.5 $/MWh, 993.68 $/h and 47,548,200 $ respectively. The designed model has the potential to prevent the release of CO2 into the atmosphere at reasonable prices.

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  • Journal IconInternational Advanced Researches and Engineering Journal
  • Publication Date IconApr 29, 2025
  • Author Icon Muhammed Arslan
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Optimizing Hydrogen Liquefaction Efficiency Through Waste Heat Recovery: A Comparative Study of Three Process Configurations

Hydrogen (H2) liquefaction is an energy-intensive process, and improving its efficiency is critical for large-scale deployment in H2 infrastructure. Industrial waste heat recovery contributes to energy savings and environmental improvements in liquid H2 processes. This study proposes a comparative framework for industrial waste heat recovery in H2 liquefaction systems by examining three recovery cycles, including an ammonia–water absorption refrigeration (ABR) unit, a diffusion absorption refrigeration (DAR) process, and a combined organic Rankine/Kalina plant. All scenarios incorporate 2 MW of industrial waste heat to improve precooling and reduce the external power demand. The simulations were conducted using Aspen HYSYS (V10) in combination with an m-file code in MATLAB (R2022b) programming to model each configuration under consistent operating conditions. Detailed energy and exergy analyses are performed to assess performance. Among the three scenarios, the ORC/Kalina-based system achieves the lowest specific power consumption (4.306 kWh/kg LH2) and the highest exergy efficiency in the precooling unit (70.84%), making it the most energy-efficient solution. Although the DAR-based system shows slightly lower performance, the ABR-based system achieves the highest exergy efficiency of 52.47%, despite its reduced energy efficiency. By comparing three innovative configurations using the same industrial waste heat input, this work provides a valuable tool for selecting the most suitable design based on either energy performance or thermodynamic efficiency. The proposed methodology can serve as a foundation for future system optimization and scale-up.

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  • Journal IconProcesses
  • Publication Date IconApr 28, 2025
  • Author Icon Seyed Masoud Banijamali + 3
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Computational Fluid Dynamics–Discrete Element Method Numerical Simulation of Hydrothermal Liquefaction of Sewage Sludge in a Tube Reactor as a Linear Fresnel Solar Collector

This paper discusses the thermal and exergy efficiency analysis of the hydrothermal liquefaction (HTL) process, which converts sewage sludge into biocrude oil in a continuous plug–flow reactor using a linear Fresnel solar collector. The investigation focuses on the influence of key operational parameters, including slurry flow rate, temperature, pressure, residence time, and the external heat transfer coefficient, on the overall efficiency of biocrude oil production. A detailed thermodynamic evaluation was conducted using process simulation principles and a kinetic model to assess mass and energy balances within the HTL reaction, considering heat and mass momentum exchange in a multiphase system using UDF. The reactor’s receiver, a copper absorber tube, has a total length of 20 m and is designed in a coiled configuration from the base to enhance heat absorption efficiency. To optimize the thermal performance of biomass conversion in the HTL process, a Computational Fluid Dynamics–Discrete Element Method (CFD-DEM) coupling numerical method approach was employed to investigate improved thermal performance by obtaining a heat source solely through solar energy. This numerical modeling approach allows for an in-depth assessment of heat transfer mechanisms and fluid-particle interactions, ensuring efficient energy utilization and sustainable process development. The findings contribute to advancing solar-driven HTL technologies by maximizing thermal efficiency and minimizing external energy requirements.

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  • Journal IconSolar
  • Publication Date IconApr 28, 2025
  • Author Icon Artur Wodołażski
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3E (Energy–Exergy–Environmental) Performance Analysis and Optimization of Seawater Shower Cooling Tower for Central Air Conditioning Systems

The thermodynamic, exergy and carbon reduction potential of seawater shower cooling towers for central air conditioning systems was investigated under various geometric, physical and environmental conditions. A mathematical model of the shower cooling tower was proposed, and the governing equations considering droplet diameter changes were numerically solved during evaporation. The results showed that compared with the downward-spraying tower, the upward-spraying tower achieved 15.59% higher cooling efficiency, 4.89% higher exergy efficiency and 34.58% higher heat dissipation. Increasing droplet diameter significantly weakened the tower’s cooling capacity, with heat dissipation decreasing by 78.11% as the diameter increased from 1 mm to 2.25 mm. The cooling efficiency, thermal efficiency and exergy efficiency demonstrated consistent declining trends with increasing droplet diameter. Under high-salinity conditions (105 g/kg), compared with standard salinity (35 g/kg), the average reduction of cooling efficiency was 2.96%, and exergy efficiency decreased by 2.73%. The increase in air velocity from 2.5 m/s to 4.0 m/s led to a 13.76% improvement in cooling efficiency and a 22.44% increase in heat dissipation, and exergy efficiency decreased by less than 2%. Through multi-objective optimization analysis, the cooling efficiency increased by 14.69% and exergy destruction decreased by 37.87%, demonstrating significant potential for energy conservation and carbon emission reduction in central air conditioning applications.

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  • Journal IconProcesses
  • Publication Date IconApr 27, 2025
  • Author Icon Lincong Luo + 2
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Performance assessment of thermal energy storage system for solar thermal applications

Low-temperature and solar-thermal applications of a new thermal energy storage system (TESS) powered by phase change material (PCM) are examined in this work. At varying mass flow rates (0.0119 kg/s and 0.00277 kg/s) and heat transfer fluid (HTF) temperatures (75 °C and 85 °C), three distinct PCMs—paraffin wax, fatty acid, and a cascaded combination of both—had their charging and discharging properties studied. Evaluated across a 240-minute charging and discharging cycle were key performance parameters including energy efficiency, exergy efficiency, entransy analysis, and heat transfer efficacy. According to the results, higher HTF temperatures reduce exergy efficiency because to increased entropy formation even when they raise charging rate. Moreover, thermodynamic performance of the cascaded PCM system increased heat transfer efficiency by 100% and by 30% respectively. Moreover, charging and exergy efficiencies were realized as at 85.2% and 47.5% respectively. The liquid percentage of the PCM was found to be 0.85 under a mass flow rate of 0.0277 kg/s after 200 min of charging. These findings demonstrate the possibility of cascaded PCM-based TESS to optimize solar energy storage for usage requiring high efficiency and constant heat transfer.

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  • Journal IconScientific Reports
  • Publication Date IconApr 22, 2025
  • Author Icon Pranav Mehta + 5
Open Access Icon Open AccessJust Published Icon Just Published
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Exergy Analysis of an On-Vehicle Floating Piston Hydrogen Compression System for Direct-Injection Engines

Direct injection of hydrogen at high pressures into an otherwise unmodified heavy-duty diesel engine offers a near-term pathway to near-zero greenhouse gas emissions for commercial vehicles. Hydrogen direct-injection engines maintain diesel-like performance with equal or better thermal efficiency. Supplying the hydrogen for injection pressures of ~30 MPa requires a high-pressure supply. Onboard hydrogen compression enables more complete utilization of the stored compressed hydrogen; however, it introduces a significant parasitic load on the engine. The magnitude of this load depends on factors such as the compressor’s configuration, capacity, pressure ratio, efficiency, and the engine’s operating conditions. This paper presents an exergy analysis of an onboard hydrogen compression system that uses hydraulically driven free-floating pistons, sized for heavy-duty commercial vehicles. Minimizing the parasitic loads from the compressor is essential to retain vehicle performance and maximize system-wide efficiency. The exergy analysis approach provides a comprehensive understanding of the whole compression system by comparably quantifying the losses across all components. A one-dimensional model of the compression system, developed in GT-SUITETM and validated with experimental data, is used to quantify the main exergy loss components. Exergy efficiency ranges from 12% to 45% under varying pressure ratios and cycle frequencies, with a pronounced increase in efficiency observed at higher cycle frequencies. Major exergy losses occur in the hydraulic driving system up to 79%, especially during retracting and idle phases for lower pressure ratios and cycle frequencies. Within the compression cylinder, exergy destructions account for less than 10% of the total work input, wherein heat transfer and piston friction are identified as the dominant contributors to exergy destruction, with their effects intensifying at higher pressure ratios. This work highlights the challenges of onboard gas compression and develops a systematic framework that can compare compressor design alternatives for different driving cycles.

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  • Journal IconEnergies
  • Publication Date IconApr 22, 2025
  • Author Icon Mehdi Nikkhah Koojehri + 3
Open Access Icon Open AccessJust Published Icon Just Published
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Thermodynamic-Environmental-Economic Evaluations of a Solar-Driven Supercritical CO2 Cycle Integrated with Cooling, Heating, and Power Generation

The combined cooling, heating, and power system is based on the principle of energy cascade utilization, which is conducive to reducing fossil energy consumption and improving the comprehensive utilization efficiency of energy. With the characteristics of a lower expansion ratio and larger recuperation of a supercritical carbon dioxide (SCO2) power cycle, a combined cooling, heating, and power (CCHP) system is proposed. The system is based on a SCO2 cycle and is driven by solar energy. The system is located in Qingdao and simulated by MATLAB/Simulink software (R2022b). Firstly, the thermodynamic performance of the CCHP system at the design condition is analyzed. The energy utilization efficiency of the CCHP system is 79.75%, and the exergy efficiency is 58.63%. Then, the thermodynamic, environmental, and economic performance analyses of the system under variable conditions are carried out. Finally, the solar multiple is optimized. The results show that the minimum levelized cost of electricity is 10.4 ¢/(kW·h), while the solar multiple is 4.8. The annual primary energy saving rate of the CCHP system is 85.04%, and the pollutant emission reduction rate is 86.05%, compared with the reference system. Therefore, an effective way to reduce environmental pollution and improve the utilization efficiency of solar energy is provided.

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  • Journal IconEnergies
  • Publication Date IconApr 13, 2025
  • Author Icon Shuang Yang + 4
Open Access Icon Open Access
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Energy, exergy, and enviro‐economic analysis of a solar receiver with phase change material for a parabolic dish collector

AbstractThis study presents a new solar receiver that incorporates a phase change material (PCM) and a water flow channel to maximize the efficiency of parabolic dish solar collectors. Stagnation and water heating experiments were conducted at 90–150 kg/h flow rates. The stagnation temperature was as high as 388°C, and the total heat loss coefficient was 342 W/m2 K. The primary and finned PCM channels enhanced energy absorption and decreased receiver temperature. The spiral water coil and rectangular fins efficiently transferred heat to the incoming water. The receiver had a maximum power of 2.81 kW at 150 kg/h, 32% and 16% greater than 90 and 120 kg/h, respectively. Heat loss decreased at higher flow rates, with the heat loss coefficient 17.9% lower at 150 kg/h than at 90 kg/h. The system had maximum and average energy efficiencies of 75.6% and 50.7%, respectively, at 150 kg/h. Exergy efficiency was reduced with a higher flow rate, with peak and mean values of 9.4% and 5% at 90 kg/h. Economically, the system offers low‐cost clean energy for $0.11/kW, and the CO₂ emission is reduced by 14.7 tons. Payback time is estimated at 1.1 years. The thermal, economic, and environmental performance of the proposed receiver indicates that it is an efficient choice for industrial and commercial water heating applications.

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  • Journal IconEnvironmental Progress & Sustainable Energy
  • Publication Date IconApr 13, 2025
  • Author Icon Ravi Saravanan + 4
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The Impact of Shaft Power Extraction on Small Turbofan Engines: A Thermodynamic and Exergy-Based Analysis for No-Bleed Architectures

In “no-bleed” engine architectures, bleed air is replaced by shaft power extraction to run the subsystems, avoiding the inefficiencies of traditional bleed systems. This approach is increasingly used in small turbofan engines, prompting analysis of its impact on engine performance and exergy efficiency. A small high-bypass turbofan engine was modeled in software under two control strategies: constant thrust (CT) and constant speed (CS), with shaft power extraction up to 18 kW. Exergy analysis evaluated efficiency losses and sustainability metrics (exergy efficiency, environmental effect factor, and exergetic sustainability index). Simulations indicate that an 18 kW shaft power extraction increases SFC by 13.6% (CT) and 42.1% (CS). Exergy efficiency rises from 47.3% to 50.7% (CT) and 54.2% (CS). However, these power draws also increase irreversibility and the environmental effect factor (EEF) grows from 0.678 to 0.732 (CT) and 0.744 (CS), while the exergetic sustainability index (ESI) drops from 1.48 to 1.34, signaling reduced sustainability at high extraction. Maintaining constant thrust during extraction incurs smaller fuel consumption and exergy efficiency penalties than constant speed control. The findings highlight the need for adaptive control strategies (e.g., limiting extraction levels or using variable-geometry components) to mitigate losses and enhance sustainability in no-bleed engine designs.

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  • Journal IconElectronics
  • Publication Date IconApr 11, 2025
  • Author Icon Runcun Li + 4
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Thermodynamic modelling of a power generation plant using solar concentrators assisted by organic Rankine cycle for João Pessoa city, Brazil

The potential for generating electricity through solar energy makes Brazil a very promising country in this segment, with several possibilities for the use of solar energy, whether in the thermal or photovoltaic part, due to the high incidence of solar radiation throughout much of the country, especially in the Northeast region. In this study, an analysis of the perfor-mance of the organic Rankine cycle (ORC) that produces electricity using solar concentrators was performed. The fluids used in the system were classified as dry type  toluene, isobutane, isopentane, R227ea, R113, R114, R245fa and R600. During the study, the energy and exergy analysis of the system was conducted for different evaporator pressures (500−2500 kPa), and two types of solar collectors were tested (parabolic trough collector and parabolic compound collec-tor). In addition, a system case study was simulated for radiation and temperature conditions in the city of João Pessoa, Brazil. Based on this analysis, the performance of the cycle components was examined, and the first and second law effi-ciencies of the system were compared for different configurations. The solar collector (parabolic trough collector) proved to be the most suitable for the studied cycle. With the adequate selection of the refrigerant, collector and evaporation pressure, the first and second law efficiencies of the cycle improve up to 41% and 44%, respectively. For the city of João Pessoa, the highest exergy efficiency occurs in the month of January, the hottest month of the year when the sun shines brightly, and the lowest exergy efficiency occurs in the month of June.

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  • Journal IconArchives of Thermodynamics
  • Publication Date IconApr 11, 2025
  • Author Icon Taynara G.S Lago + 5
Open Access Icon Open Access
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A Comprehensive Review of Inorganic Refrigerants in LNG Liquefaction Cycles: Thermodynamic Performance and Environmental Impact

As the demand for Liquefied Natural Gas (LNG) continues to rise, the need for efficient and environmentally friendly refrigeration technologies has become more critical. This study presents a comprehensive review of inorganic refrigerants used in Liquefied Natural Gas (LNG) liquefaction cycles, concentrating on their thermodynamic performance and environmental effects. Using a thorough literature study, important refrigerants such as nitrogen, argon, krypton, xenon, and ammonia were examined in terms of efficiency, energy consumption, and sustainability. The findings show that inorganic refrigerants can improve energy efficiency by lowering power consumption and increasing exergy performance. Nitrogen was found to require the least amount of energy, whereas ammonia significantly increased the coefficient of performance (COP) in mixed refrigerant applications. Krypton and xenon both demonstrated great exergy efficiency, making them attractive candidates for future LNG operations. While these refrigerants have a lesser environmental effect than standard hydrocarbons, more advances are needed. The study recommends optimizing hybrid refrigerant systems, including renewable energy, and improving safety measures. Advancing these strategies can make LNG production more sustainable, reducing its carbon footprint while maintaining efficiency.

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  • Journal IconInternational Journal of Applied and Natural Sciences
  • Publication Date IconApr 11, 2025
  • Author Icon Chukwuka Dennis Offodum + 1
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Energy and Exergy Analysis of a Hybrid Photovoltaic–Thermoelectric System with Passive Thermal Management

Hybrid photovoltaic (PV) and thermoelectric generator (TEG) systems combine heat and light energy harvesting in a single module by utilizing the entire solar spectrum. This work analyzed the feasibility and performance of a hybrid photovoltaic–thermoelectric generator system with efficient thermal management by integrating heat pipe (HP), radiative cooling (RC), and heat sink (HS) systems. The proposed system effectively reduces the PV operation temperature by evacuating the residual heat used in the TEG system to generate an additional amount of electricity. The remaining heat is evacuated from the TEG’s cold side to the atmosphere using RC and HS systems. This study also analyzed the inclusion of two TEG arrays on both sides of the HP condenser section. This numerical analysis was performed using COMSOL Multiphysics 5.5 software and was validated by previous analysis. The performance was evaluated through an energy and exergy analysis of the TEG and PV systems. Enhancing the thermal management of the hybrid PV-TEG system can increase energy production by 2.4% compared to a PV system operating under the same ambient and solar radiation conditions. Furthermore, if the proposed system includes a second array of TEG modules, the energy production increases by 5.8% compared to the PV system. The exergy analysis shows that the enhancement in the thermal management of the PV operating temperature decreases the thermal exergy efficiency of the proposed system but increases the electricity exergy efficiency. Including TEG modules on both sides of the condenser section of the HP shows the system’s best thermal and electrical performance. These results may be helpful for the optimal design of realistic solar-driven hybrid systems for globally deserted locations.

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  • Journal IconEnergies
  • Publication Date IconApr 9, 2025
  • Author Icon Francisco J Montero + 5
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