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Artículos de revistas sobre el tema "Combined exergy and pinch analysis"

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Publicado: 23 de noviembre de 2024

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1

Sorin, M. "Combined Exergy and Pinch Approach to Process Analysis". Computers & Chemical Engineering 21, n.º 1-2 (1997): S23—S28. http://dx.doi.org/10.1016/s0098-1354(97)00020-3.

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2

Sorin, M. y J. Paris. "Combined exergy and pinch approach to process analysis". Computers & Chemical Engineering 21 (mayo de 1997): S23—S28. http://dx.doi.org/10.1016/s0098-1354(97)87473-x.

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3

Dhole, V. R. y J. P. Zheng. "Applying Combined Pinch and Exergy Analysis to Closed-Cycle Gas Turbine System Design". Journal of Engineering for Gas Turbines and Power 117, n.º 1 (1 de enero de 1995): 47–52. http://dx.doi.org/10.1115/1.2812780.

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Pinch technology has developed into a powerful tool for thermodynamic analysis of chemical processes and associated utilities, resulting in significant energy savings. Conventional pinch analysis identifies the most economical energy consumption in terms of heat loads and provides practical design guidelines to achieve this. However, in analyzing systems involving heat and power, for example, steam and gas turbines, etc., pure heat load analysis is insufficient. Exergy analysis, on the other hand, provides a tool for heat and power analysis, although at times it does not provide clear practical design guidelines. An appropriate combination of pinch and exergy analysis can provide practical methodology for the analysis of heat and power systems. The methodology has been successfully applied to refrigeration systems. This paper introduces the application of a combined pinch and exergy approach to commercial power plants with a demonstration example of a closed-cycle gas turbine (CCGT) system. Efficiency improvement of about 0.82 percent (50.2 to 51.02 percent) can be obtained by application of the new approach. More importantly, the approach can be used as an analysis and screening tool for the various design improvements and is generally applicable to any commercial power generation facility.
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4

Riadi, Indra, Johnner Sitompul y Hyung Woo Lee. "Pinch-Exergy Approach to Enhance Sulphitation Process Efficiency in Sugar Manufacturing". CHEESA: Chemical Engineering Research Articles 7, n.º 1 (22 de abril de 2024): 1. http://dx.doi.org/10.25273/cheesa.v7i1.17831.1-14.

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<p class="StyleE-JOURNALAbstrakKeywordsBold">This study aimed to enhance the thermal efficiency of the sulphitation process in the boiling house of sugar plants using a combined approach of pinch and exergy analyses. Pinch analysis is a reliable method for optimizing the design of energy recovery systems. However, the primary limitations arise from its exclusive focus on heat transfer processes. On the other hand, exergy balance provides valuable insight into the consumption of supplied exergy by individual process units, serving as a quantitative measure of inefficiency. The boiling house was evaluated and modified using pinch-exergy analysis with Sulphitation Process capacity production of 8000 TCD. The results showed a potential reduction in exergy destruction by approximately 10.25 MW. The optimization effort led to reductions of 18.18 and 14.70% in the use of hot and cold external utility, respectively.</p>
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5

Sharew, Shumet Sendek, Alessandro Di Pretoro, Abubeker Yimam, Stéphane Negny y Ludovic Montastruc. "Combining Exergy and Pinch Analysis for the Operating Mode Optimization of a Steam Turbine Cogeneration Plant in Wonji-Shoa, Ethiopia". Entropy 26, n.º 6 (27 de mayo de 2024): 453. http://dx.doi.org/10.3390/e26060453.

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In this research, the simulation of an existing 31.5 MW steam power plant, providing both electricity for the national grid and hot utility for the related sugar factory, was performed by means of ProSimPlus® v. 3.7.6. The purpose of this study is to analyze the steam turbine operating parameters by means of the exergy concept with a pinch-based technique in order to assess the overall energy performance and losses that occur in the power plant. The combined pinch and exergy analysis (CPEA) initially focuses on the depiction of the hot and cold composite curves (HCCCs) of the steam cycle to evaluate the energy and exergy requirements. Based on the minimal approach temperature difference (∆Tlm) required for effective heat transfer, the exergy loss that raises the heat demand (heat duty) for power generation can be quantitatively assessed. The exergy composite curves focus on the potential for fuel saving throughout the cycle with respect to three possible operating modes and evaluates opportunities for heat pumping in the process. Well-established tools, such as balanced exergy composite curves, are used to visualize exergy losses in each process unit and utility heat exchangers. The outcome of the combined exergy–pinch analysis reveals that energy savings of up to 83.44 MW may be realized by lowering exergy destruction in the cogeneration plant according to the operating scenario.
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6

Yushkova, E. A. y V. A. Lebedev. "Exergy analysis of the boiler using the pinch method". Power engineering: research, equipment, technology 21, n.º 4 (9 de diciembre de 2019): 58–65. http://dx.doi.org/10.30724/1998-9903-2019-21-4-58-65.

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This article will help to consider the problem of thermodynamic optimization of heat power equipment. Solving this issue will allow to increase the energy efficiency of thermal systems by reducing the cost of energy resources. There is a large number of methods for studying power plants, and we will combine two of them: the exergy method and the pinch method. Exergy analysis of thermal systems shows quantitative and qualitative characteristics of efficiency. The pinch method allows us to solve specific design problems to optimize the parameters of heat power facilities. The pinch analysis is based on enthalpy, which does not take into account the heat potential. We propose to conduct a pinch analysis of thermal energy sources using exergy, which can better assess the potential of heat fluxes and show the dependence of the energy of heat fluxes on the ambient temperature. The article provides an exergy analysis of a direct-flow boiler PP2650-255 GM using the pinch method. The results of our work show that in order to increase the energy efficiency of the boiler, it is possible to change the area of the heating surfaces of the economizer and air heater. Thus, exergy pinch analysis is an effective method for increasing the energy efficiency of heat power equipment.
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7

Arriola-Medellín, Alejandro, Emilio Manzanares-Papayanopoulos y César Romo-Millares. "Diagnosis and redesign of power plants using combined Pinch and Exergy Analysis". Energy 72 (agosto de 2014): 643–51. http://dx.doi.org/10.1016/j.energy.2014.05.090.

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8

Hamsani, Muhammad Nurheilmi, Timothy Gordon Walmsley, Peng Yen Liew y Sharifah Rafidah Wan Alwi. "Combined Pinch and exergy numerical analysis for low temperature heat exchanger network". Energy 153 (junio de 2018): 100–112. http://dx.doi.org/10.1016/j.energy.2018.04.023.

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9

Ochoa, Guillermo Valencia, Carlos Acevedo Peñaloza y Jhan Piero Rojas. "Thermoeconomic Modelling and Parametric Study of a Simple ORC for the Recovery of Waste Heat in a 2 MW Gas Engine under Different Working Fluids". Applied Sciences 9, n.º 21 (25 de octubre de 2019): 4526. http://dx.doi.org/10.3390/app9214526.

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This paper presents a thermo-economic analysis of a simple organic Rankine cycle (SORC) as a waste heat recovery (WHR) systems of a 2 MW stationary gas engine evaluating different working fluids. Initially, a systematic methodology was implemented to select three organic fluids according to environmental and safety criteria, as well as critical system operational conditions. Then, thermodynamic, exergy, and exergo-economic models of the system were developed under certain defined considerations, and a set of parametric studies are presented considering key variables of the system such as pump efficiency, turbine efficiency, pinch point condenser, and evaporator. The results show the influence of these variables on the combined power of the system (gas engine plus ORC), ORC exergetic efficiency, specific fuel consumption (∆BSFC), and exergo indicators such as the payback period (PBP), levelized cost of energy (LCOE), and the specific investment cost (SIC). The results revealed that heat transfer equipment had the highest exergy destruction cost rates representing 81.25% of the total system cost. On the other hand, sensitivity analyses showed that acetone presented better energetic and exergetic performance when the efficiency of the turbine, evaporator, and condenser pinch point was increased. However, toluene was the fluid with the best results when pump efficiency was increased. In terms of the cost of exergy destroyed by equipment, the results revealed that acetone was the working fluid that positively impacted cost reduction when pump efficiency was improved; and toluene, when turbine efficiency was increased. Finally, the evaporator and condenser pinch point increased all the economic indicators of the system. In this sense, the working fluid with the best performance in economic terms was acetone, when the efficiency of the turbine, pinch condenser, and pinch evaporator was enhanced.
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10

Riady, M. I., D. Santoso y M. D. Bustan. "Thermodynamics Performance Evaluation in Combined Cycle Power Plant by Using Combined Pinch and Exergy Analysis". Journal of Physics: Conference Series 1198, n.º 4 (abril de 2019): 042006. http://dx.doi.org/10.1088/1742-6596/1198/4/042006.

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11

Gonçalves, L. P. y F. R. P. Arrieta. "AN EXERGY COST ANALYSIS OF A COGENERATION PLANT". Revista de Engenharia Térmica 9, n.º 1-2 (31 de diciembre de 2010): 28. http://dx.doi.org/10.5380/reterm.v9i1-2.61927.

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The exergy analysis, including the calculation of the unit exergetic cost of all flows of the cogeneration plant, was the main purpose of the thermoeconomic analysis of the STAG (STeam And Gas) combined cycle CHP (Combined Heat and Power) plant. The combined cycle cogeneration plant is composed of a GE10 gas turbine (11250 kW) coupled with a HRSG (Heat Recovery Steam Generator) and a condensing extraction steam turbine. The GateCycleTM Software was used for the modeling and simulation of the combined cycle CHP plant thermal scheme, and calculation of the thermodynamic properties of each flow (Mass Flow, Pressure, Temperature, Enthalpy). The entropy values for water and steam were obtained from the Steam Tab software while the entropy and exergy of the exhaust gases were calculated as instructed by. For the calculation of the unit exergetic cost was used the neguentropy and Structural Theory of Thermoeconomic. The GateCycleTM calculations results were exported to an Excel sheet to carry out the exergy analysis and the unit exergetic cost calculations with the thermoeconomic model that was created for matrix inversion solution. Several simulations were performed varying separately five important parameters: the Steam turbine exhaust pressure, the evaporator pinch point temperature, the steam turbine inlet temperature, Rankine cycle operating pressure and the stack gas temperature to determine their impact in the recovery cycle heat exchangers transfer area, power generation and unit exergetic cost.
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12

Khoshgoftar Manesh, M. H. y M. A. Rosen. "Combined Cycle and Steam Gas-Fired Power Plant Analysis through Exergoeconomic and Extended Combined Pinch and Exergy Methods". Journal of Energy Engineering 144, n.º 2 (abril de 2018): 04018010. http://dx.doi.org/10.1061/(asce)ey.1943-7897.0000506.

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13

Bett, Alvin Kiprono y Saeid Jalilinasrabady. "Optimization of ORC Power Plants for Geothermal Application in Kenya by Combining Exergy and Pinch Point Analysis". Energies 14, n.º 20 (13 de octubre de 2021): 6579. http://dx.doi.org/10.3390/en14206579.

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Geothermal energy is a sustainable renewable source of energy. The installed capacity of geothermal energy in Kenya is 847.4 MWe of the total 2.7 GWe. This paper presents the effect of six different working fluids to optimize the geothermal of 21.5 MWe of reinjected brine at a single-flash power plant in Kenya. Engineering Equation Solver (EES) code was used to design and optimize simple organic Rankine (ORC) and regenerative cycles. The objective was to combine pinch point analysis and exergy analysis for the optimum utilization of geothermal energy by varying the turbine inlet pressure, pinch point, and reinjection temperature. The turbine inlet pressures, and pinch points were varied to obtain optimum pressures for higher net power output and exergy efficiencies. As the pressure increased, the efficiencies and net power generated increase to optimal at turbine inlet pressures between 2000 and 3000 kPa. By maintaining a condenser temperature at 46.7 °C, the turbine outlet pressures were 557.5 kPa for isobutene, 627.4 kPa for isobutane, 543.7 kPa for butene, 438.9 kPa for trans-2-butene, 412.3 kPa for R236ea, and 622.9 kPa for R142b. For the pinch point of 10 °C, the working fluid with a lower net power is trans-2-butene at 5936 kW for a flow rate of 138.8 kg/s and the highest reinjection at 89.05 °C. On the other hand, R236ae had a flow rate of 398.2 kg/s, a higher power output of 7273 kW, and the lowest reinjection temperature of 73.47 °C for a 5 °C pinch point. In the pinch point consideration, the suitable fluid will depend on the best reinjection temperatures. The pinch point affects the heat transfer rates and effectiveness in the heat exchangers. The best pinch point is 10 °C, since the reinjection temperatures are the highest between 83 and 89 °C. The analysis showed that for unlimited reinjection temperatures, basic ORC is suitable. The regenerative cycle would be best suited where reinjection temperature is constrained by brine geochemistry.
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14

Bett, Alvin Kiprono y Saeid Jalilinasrabady. "Optimization of ORC Power Plants for Geothermal Application in Kenya by Combining Exergy and Pinch Point Analysis". Energies 14, n.º 20 (13 de octubre de 2021): 6579. http://dx.doi.org/10.3390/en14206579.

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Geothermal energy is a sustainable renewable source of energy. The installed capacity of geothermal energy in Kenya is 847.4 MWe of the total 2.7 GWe. This paper presents the effect of six different working fluids to optimize the geothermal of 21.5 MWe of reinjected brine at a single-flash power plant in Kenya. Engineering Equation Solver (EES) code was used to design and optimize simple organic Rankine (ORC) and regenerative cycles. The objective was to combine pinch point analysis and exergy analysis for the optimum utilization of geothermal energy by varying the turbine inlet pressure, pinch point, and reinjection temperature. The turbine inlet pressures, and pinch points were varied to obtain optimum pressures for higher net power output and exergy efficiencies. As the pressure increased, the efficiencies and net power generated increase to optimal at turbine inlet pressures between 2000 and 3000 kPa. By maintaining a condenser temperature at 46.7 °C, the turbine outlet pressures were 557.5 kPa for isobutene, 627.4 kPa for isobutane, 543.7 kPa for butene, 438.9 kPa for trans-2-butene, 412.3 kPa for R236ea, and 622.9 kPa for R142b. For the pinch point of 10 °C, the working fluid with a lower net power is trans-2-butene at 5936 kW for a flow rate of 138.8 kg/s and the highest reinjection at 89.05 °C. On the other hand, R236ae had a flow rate of 398.2 kg/s, a higher power output of 7273 kW, and the lowest reinjection temperature of 73.47 °C for a 5 °C pinch point. In the pinch point consideration, the suitable fluid will depend on the best reinjection temperatures. The pinch point affects the heat transfer rates and effectiveness in the heat exchangers. The best pinch point is 10 °C, since the reinjection temperatures are the highest between 83 and 89 °C. The analysis showed that for unlimited reinjection temperatures, basic ORC is suitable. The regenerative cycle would be best suited where reinjection temperature is constrained by brine geochemistry.
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15

Javanshir, Nima, S. M. Seyed Mahmoudi y Marc A. Rosen. "Thermodynamic and Exergoeconomic Analyses of a Novel Combined Cycle Comprised of Vapor-Compression Refrigeration and Organic Rankine Cycles". Sustainability 11, n.º 12 (18 de junio de 2019): 3374. http://dx.doi.org/10.3390/su11123374.

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In this study, a cooling/power cogeneration cycle consisting of vapor-compression refrigeration and organic Rankine cycles is proposed and investigated. Utilizing geothermal water as a low-temperature heat source, various operating fluids, including R134a, R22, and R143a, are considered for the system to study their effects on cycle performance. The proposed cycle is modeled and evaluated from thermodynamic and thermoeconomic viewpoints by the Engineering Equation Solver (EES) software. Thermodynamic properties as well as exergy cost rates for each stream are found separately. Using R143a as the working fluid, thermal and exergy efficiencies of 27.2% and 57.9%, respectively, are obtained for the cycle. Additionally, the total product unit cost is found to be 60.7 $/GJ. A parametric study is carried out to determine the effects of several parameters, such as turbine inlet pressure, condenser temperature and pressure, boiler inlet air temperature, and pinch-point temperature difference, on the cycle performance. The latter is characterized by such parameters as thermal and exergy efficiencies, refrigeration capacity, produced net power rate, exergy destruction rate, and the production unit cost rates. The results indicate that the system using R134a exhibits the lowest thermal and exergy efficiencies among other working fluids, while the systems using R22 and R143a exhibit the highest energy and exergy efficiencies, respectively. The boiler and turbine contribute the most to the total exergy destruction rate.
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16

Ren, Jie, Chen Xu, Zuoqin Qian, Weilong Huang y Baolin Wang. "Exergoeconomic Analysis and Optimization of a Biomass Integrated Gasification Combined Cycle Based on Externally Fired Gas Turbine, Steam Rankine Cycle, Organic Rankine Cycle, and Absorption Refrigeration Cycle". Entropy 26, n.º 6 (12 de junio de 2024): 511. http://dx.doi.org/10.3390/e26060511.

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Adopting biomass energy as an alternative to fossil fuels for electricity production presents a viable strategy to address the prevailing energy deficits and environmental concerns, although it faces challenges related to suboptimal energy efficiency levels. This study introduces a novel combined cooling and power (CCP) system, incorporating an externally fired gas turbine (EFGT), steam Rankine cycle (SRC), absorption refrigeration cycle (ARC), and organic Rankine cycle (ORC), aimed at boosting the efficiency of biomass integrated gasification combined cycle systems. Through the development of mathematical models, this research evaluates the system’s performance from both thermodynamic and exergoeconomic perspectives. Results show that the system could achieve the thermal efficiency, exergy efficiency, and levelized cost of exergy (LCOE) of 70.67%, 39.13%, and 11.67 USD/GJ, respectively. The analysis identifies the combustion chamber of the EFGT as the component with the highest rate of exergy destruction. Further analysis on parameters indicates that improvements in thermodynamic performance are achievable with increased air compressor pressure ratio and gas turbine inlet temperature, or reduced pinch point temperature difference, while the LCOE can be minimized through adjustments in these parameters. Optimized operation conditions demonstrate a potential 5.7% reduction in LCOE at the expense of a 2.5% decrease in exergy efficiency when compared to the baseline scenario.
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17

Ghannadzadeh, Ali y Majid Sadeqzadeh. "Combined pinch and exergy analysis of an ethylene oxide production process to boost energy efficiency toward environmental sustainability". Clean Technologies and Environmental Policy 19, n.º 8 (31 de julio de 2017): 2145–60. http://dx.doi.org/10.1007/s10098-017-1402-5.

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18

Mehdizadeh-Fard, Mohsen, Fathollah Pourfayaz, Mehdi Mehrpooya y Alibakhsh Kasaeian. "Improving energy efficiency in a complex natural gas refinery using combined pinch and advanced exergy analyses". Applied Thermal Engineering 137 (junio de 2018): 341–55. http://dx.doi.org/10.1016/j.applthermaleng.2018.03.054.

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19

El Haj Assad, Mamdouh, Yashar Aryanfar, Amirreza Javaherian, Ali Khosravi, Karim Aghaei, Siamak Hosseinzadeh, Juan Pabon y SMS Mahmoudi. "Energy, exergy, economic and exergoenvironmental analyses of transcritical CO2 cycle powered by single flash geothermal power plant". International Journal of Low-Carbon Technologies 16, n.º 4 (1 de noviembre de 2021): 1504–18. http://dx.doi.org/10.1093/ijlct/ctab076.

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Abstract The need for energy is increasing worldwide as the population has a continuous trend of increase. The restrictions on energy sources are becoming tougher as the authorities set these developed and developing countries. This leads to looking for other alternative energy sources to replace the conventional energy sources, leading to greenhouse emissions. Environmentally friendly energy sources (renewable energies), for example, geothermal, solar and wind, are viewed as clean and sustainable energy sources. Among these kinds of energy sources, geothermal energy is one of the best options because, like solar and wind energy sources, it does not depend on weather conditions. In this work, a single flash geothermal power plant is used to power a transcritical CO2 power plant is proposed. The energy and exergy analysis of the proposed combined power plant has been performed and the best possible operating mode of the power plant has been discussed. The effects of parameters such as separator pressure, CO2 condenser temperature and CO2 turbine inlet pressure and the pinch point on the energy efficiency, exergy efficiency and output power are determined and discussed. Our results indicate that the highest exergy destruction is in the CO2 vapor generator of 182.4 kW followed by the CO2 turbine of 106 kW, then the CO2 condenser of 82.81 kW and then the CO2 pump 58.76 kW. The lowest exergy destruction rates occur in the single flash geothermal power plant components where the separator has exactly zero exergy destruction rate. The results also show that the combined power plant produces more power and has better efficiencies (first law and second law) than the stand-alone geothermal power plant. Finally, Nelder–Mead simplex method is applied to determine the optimal parameters such as separator pressure, power output and pumps input power and second law efficiency. The results show that the power plant should be operated at a lower pinch temperature to reduce damage to the environment. As the condenser pressure increases, the environmental damage effectiveness coefficient decreases sharply until it reaches the minimum value of 1.2 to 1.7 MPa and then starts to increase. The trend of the impact of sports on environmental improvement is exactly the opposite of the trend of the effectiveness of environmental damage. Therefore, from an environmental point of view, it is recommended to operate the gas turbine at a high inlet pressure.
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20

Silva Ortiz, Maciel Filho y Posada. "Mass and Heat Integration in Ethanol Production Mills for Enhanced Process Efficiency and Exergy-Based Renewability Performance". Processes 7, n.º 10 (27 de septiembre de 2019): 670. http://dx.doi.org/10.3390/pr7100670.

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This paper presents the process design and assessment of a sugarcane-based ethanol production system that combines the usage of both mass and heat integration (pinch analysis) strategies to enhance the process efficiency and renewability performance. Three configurations were analyzed: (i) Base case: traditional ethanol production (1G); (ii) mass-integrated (1G2G); and (iii) mass and heat-integrated system (1G2G-HI). The overall assessment of these systems was based on complementary approaches such as mass and mass–heat integration, energy and exergy analysis, exergy-based greenhouse gas (GHG) emissions, and renewability exergy criteria. The performances of the three cases were assessed through five key performance indicators (KIPs) divided into two groups: one is related to process performance, namely, energy efficiency, exergy efficiency, and average unitary exergy cost (AUEC), and the other one is associated to environmental performance i.e., exergy-based CO2-equation emissions and renewability exergy index. Results showed a higher exergy efficiency of 50% and the lowest AUEC of all the systems (1.61 kJ/kJ) for 1G2G-HI. Furthermore, the destroyed exergy in 1G2G-HI was lower by 7% and 9% in comparison to the 1G and 1G2G cases, respectively. Regarding the exergy-based GHG emissions and renewability performance (λindex), the 1G2G-HI case presented the lowest impacts in terms of the CO2-equivalent emissions (94.10 gCO2-eq/MJ products), while λindex was found to be environmentally unfavorable (λ = 0.77). However, λindex became favorable (λ > 1) when the useful exergy of the byproducts was considered.
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21

Senoussaoui, Noha-Lys, Raphaële Thery Hetreux y Gilles Hetreux. "Method combining exergy and pinch analysis for the optimisation of a methanol production process based on natural gas and recovered CO2". MATEC Web of Conferences 379 (2023): 01004. http://dx.doi.org/10.1051/matecconf/202337901004.

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Following the third part of the IPCC report (GIEC, 2022), carbon capture and utilisation of CO2 emitted by fossil fuel represents one of many ways to curb an increasingly alarming global warming. Reaching this goal implies the transition from a fossil fuel dependant and energy-intensive society to a sober and carbon-free one. According to the (ADEME et al., 2020), steam methane reforming, main production path for syngas, still generates 11 kg CO2/kg H2. Countless scientists have already studied different solutions aiming to lower these emissions, including through the design of innovative CO2 recovering processes. Among these solutions, the integration of CO2 within natural gas based methanol (MeOH) production processes appears to be promising (Nami et al., 2019 ; Wang et al., 2021). Contributing to the development of these more sober and sustainable production sectors involves the implementation of innovative conceptual approaches, along with the design of processes with excellent energetic performances. To this end, there has been a growing interest in exergy analysis in the last few years. This technique is able to identify and characterise a process’ thermodynamic inefficiencies, thus assisting the engineer in the development of innovative processes (Dincer and Rosen, 2015; Gourmelon et al., 2017). The COOPERE method (COmbiner Optimisation des ProcédEs, Récupération et analyse Exergétique), developed in the Laboratoire de Génie Chimique de Toulouse (Gourmelon, 2015), lies on the combined use of exergy analysis, a case based reasoning approach (Roldan Reyes, 2012) and pinch analysis. This method enables to design processes as energetically sober as economically viable. In this paper, the latter is applied to a MeOH production process based on natural gas and recovered CO2, described by (Yang et al., 2018).
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Han, Bing-Chuan, Yong-Dong Chen, Gai-Ge Yu, Xiao-Hong Wu y Tao-Tao Zhou. "Completely Recuperative Supercritical CO2 Recompression Brayton/Absorption Combined Power/Cooling Cycle: Performance Assessment and Optimization". International Journal of Photoenergy 2022 (20 de mayo de 2022): 1–22. http://dx.doi.org/10.1155/2022/3869867.

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Excessive heat losses and water consumption in cooling units are significant constraints restricting the application circumstances and performances for the SCO2 Brayton cycle, and the heat exchange capacity in the precooler (PRC) is typically 1.5 times that of power generation. Therefore, this research offers a high-integrated combined power/cooling system in which two waste heat exchangers (WHEs) and a rectifier (RET) are used instead of the PRC to achieve 100% exhaust heat recovery. Each component’s energy and exergy models are developed, and the operational characteristics, coupling relationships, and exergy destruction distribution are examined. Results indicate that, when compared to the Brayton cycle, the thermal and exergy efficiency is considerably increased, and the concentration difference and WHE1 pitch point difference have significant influences on system performance. Further exergoeconomic and optimization analysis reveals that the superior exergy case is mostly recommended for relevant thermal and exergy efficiency increasing rates of 13.7% and 9.17%, respectively, and the unit cost is 81.33% that of the base case. Turbine 1 (TUR1) and main compressor (MCP) are the first and second highest cost rates, respectively, and RET and generator (GEN) account for roughly 34% exergy destruction rate and 20% exergy destruction cost rate, respectively. In addition, reducing heat transfer differences in relevant equipment can further promote system performance.
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23

Zhao, Ying-jie, Yu-ke Zhang, Yang Cui, Yuan-yuan Duan, Yi Huang, Guo-qiang Wei, Usama Mohamed, Li-juan Shi, Qun Yi y William Nimmo. "Pinch combined with exergy analysis for heat exchange network and techno-economic evaluation of coal chemical looping combustion power plant with CO2 capture". Energy 238 (enero de 2022): 121720. http://dx.doi.org/10.1016/j.energy.2021.121720.

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Lebedev, Vladimir Aleksandrovich y Ekaterina Aleksandrovn Yushkova. "Mathematical Model for Optimization of Heat Exchange Systems of a Refinery". E3S Web of Conferences 161 (2020): 01001. http://dx.doi.org/10.1051/e3sconf/202016101001.

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The article is devoted to the issue of thermodynamic optimization of heat transfer systems. Optimization is carried out by an exergy pinch method. This method includes the advantages of exergy analysis and pinch method. Exergy analysis takes into account the quantitative and qualitative characteristics of thermal processes, the pinch method allows structural and parametric optimization of heat transfer systems. The article presents a mathematical model for optimization by exergy pinch analysis. This model allows automated system optimization. Exergy pinch analysis allows more efficient use of energy and resources at the enterprise, which is relevant today.
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25

Lebedev, Vladimir y Ekaterina Yushkova. "Mathematical model for optimization of heat exchange systems". E3S Web of Conferences 164 (2020): 02011. http://dx.doi.org/10.1051/e3sconf/202016402011.

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The article is devoted to the issue of thermodynamic optimization of heat transfer systems. Optimization is carried out by an exergy pinch method. This method includes the advantages of exergy analysis and pinch method. Exergy analysis takes into account the quantitative and qualitative characteristics of thermal processes, the pinch method allows structural and parametric optimization of heat transfer systems. The article presents a mathematical model for optimization by exergy pinch analysis. This model allows automated system optimization. Exergy pinch analysis allows more efficient use of energy and resources at the enterprise, which is relevant today.
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26

Lebedev, Vladimir, Ekaterina Yushkova y Ivan Churkin. "Exergy pinch analysis of a furnace in a primary oil refining unit". E3S Web of Conferences 124 (2019): 05088. http://dx.doi.org/10.1051/e3sconf/201912405088.

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The article considers the issue of thermodynamic optimization of heat power equipment. The solution to this problem allows one to increase the energy efficiency of heat systems by reducing the energy resources consumption. The article compares the traditional (enthalpy) pinch method and the exergy pinch method. The exergy method of thermodynamic analysis allows one to take into account both quantitative and qualitative characteristics of thermal processes. A furnace that heats oil in the ELOU AT-6 primary oil refining unit was selected as an object of the study. The results obtained using the traditional pinch method showed that the furnace does not require optimization. However, the exergy analysis showed that the furnace has exergy losses. The method of exergy pinch analysis allows us to formulate and justify specific design measures aimed at increasing the furnace energy efficiency. Using the exergy pinch analysis, one can identify the unused exergy and determine the part in which the loss occurs.
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27

Yushkova, Ekaterina, Vladimir Lebedev, Pavel Yakovlev y Maria Akmanova. "Exergy pinch analysis structural optimization". Energy Safety and Energy Economy 5 (noviembre de 2020): 37–41. http://dx.doi.org/10.18635/2071-2219-2020-5-37-41.

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Structural optimization is an important tool in the power system design process. This paper contains general principles of structural optimization in thermal power and an algorithm of developing interconnection between heat exchangers. As an example, pinch and exergy analysis for energy efficient design of a crude oil refinery facility was performed. The pinch and exergy analysis counts qualitative and quantitative parameters of thermal processes. This method showed a lack of energy efficiency in a given example and losses of exergy which can be potentially utilized in a manufacturing process.
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28

Bou Malham, Zoughaib, Tinoco y Schuhler. "Hybrid Optimization Methodology (Exergy/Pinch) and Application on a Simple Process". Energies 12, n.º 17 (28 de agosto de 2019): 3324. http://dx.doi.org/10.3390/en12173324.

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In the light of the alarming impending energy scene, energy efficiency and exergy efficiency are unmistakably gathering momentum. Among efficient process design methodologies, literature suggests pinch analysis and exergy analysis as two powerful thermodynamic methods, each showing certain drawbacks, however. In this perspective, this article puts forward a methodology that couples pinch and exergy analysis in a way to surpass their individual limitations in the aim of generating optimal operating conditions and topology for industrial processes. Using new optimizing exergy‐based criteria, exergy analysis is used not only to assess the exergy but also to guide the potential improvements in industrial processes structure and operating conditions. And while pinch analysis considers only heat integration to satisfy existent needs, the proposed methodology allows including other forms of recoverable exergy and explores new synergy pathways through conversion systems. A simple case study is proposed to demonstrate the applicability and efficiency of the proposed method.
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Лебедев, Владимир Александрович y Екатерина Александровна Юшкова. "ЭКСЕРГЕТИЧЕСКИЙ ПИНЧ-АНАЛИЗ ВСЕХ ЭЛЕМЕНТОВ КОТЕЛЬНОГО АГРЕГАТА И КОТЕЛЬНОГО АГРЕГАТА В ЦЕЛОМ". Izvestiya Tomskogo Politekhnicheskogo Universiteta Inziniring Georesursov 331, n.º 8 (24 de agosto de 2020): 92–98. http://dx.doi.org/10.18799/24131830/2020/8/2771.

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The relevance of the research is caused by the need to improve the energy efficiency of heating systems, since all types of fuel are becoming more expensive. In this regard, there is a need to create a method of thermodynamic improvement of heat engineering systems. The main aim of the research is the creation of a method for improving heating systems, the application of this method on the example of a boiler unit PP-2650-255 GM. Objects: a direct-flow boiler PP-2650-255 GM, for which a thermodynamic analysis of the processes occurring in individual elements of the boiler – an air heater, economizer, firebox, and superheater – is performed. The article analyzes all heat fluxes on each element of the boiler. Methods. An exergy method of thermodynamic analysis is used as a research tool. It allows taking into account the energy potential of thermal processes. To date, the most effective method of parametric optimization of heat and power processes is the method of integration of heat flows (pinch method). However, the pinch method is based on a change in flow enthalpy, which does not take into account the qualitative characteristics of energy. In the article, the development of the pinch method continues; flow exergy is used instead of flow enthalpy. Optimization of heat engineering parameters is carried out using an exergy pinch method. Results. Exergy pinch analysis allows you to identify unused exergy and determine in which part the loss occurs. According to the calculations and the graph, it can be seen that hot flows lost 1503,57 MW of exergy, cold flows took 1295,57 MW of exergy, taking into account cooling of the working fluid by bypass. Thus, 47,9 MW of unused exergy was detected in this boiler unit. The results of the exergy pinch analysis allow us to formulate and justify specific design measures to improve the energy efficiency of the boiler unit. This analysis allows you to effectively use the energy and resources of heating equipment.
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30

Sorin, M. y J. Paris. "Integrated exergy load distribution method and pinch analysis". Computers & Chemical Engineering 23, n.º 4-5 (mayo de 1999): 497–507. http://dx.doi.org/10.1016/s0098-1354(98)00288-9.

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31

Feng, X. y X. X. Zhu. "Combining pinch and exergy analysis for process modifications". Applied Thermal Engineering 17, n.º 3 (marzo de 1997): 249–61. http://dx.doi.org/10.1016/s1359-4311(96)00035-x.

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32

Walmsley, Timothy Gordon, Benjamin James Lincoln, Roger Padullés y Donald John Cleland. "Advancing Industrial Process Electrification and Heat Pump Integration with New Exergy Pinch Analysis Targeting Techniques". Energies 17, n.º 12 (8 de junio de 2024): 2838. http://dx.doi.org/10.3390/en17122838.

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The process integration and electrification concept has significant potential to support the industrial transition to low- and net-zero-carbon process heating. This increasingly essential concept requires an expanded set of process analysis tools to fully comprehend the interplay of heat recovery and process electrification (e.g., heat pumping). In this paper, new Exergy Pinch Analysis tools and methods are proposed that can set lower bound work targets by acutely balancing process heat recovery and heat pumping. As part of the analysis, net energy and exergy load curves enable visualization of energy and exergy surpluses and deficits. As extensions to the grand composite curve in conventional Pinch Analysis, these curves enable examination of different pocket-cutting strategies, revealing their distinct impacts on heat, exergy, and work targets. Demonstrated via case studies on a spray dryer and an evaporator, the exergy analysis targets net shaft-work correctly. In the evaporator case study, the analysis points to the heat recovery pockets playing an essential role in reducing the work target by 25.7%. The findings offer substantial potential for improved industrial energy management, providing a robust framework for engineers to enhance industrial process and energy sustainability.
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33

Radgen, Peter y Klaus Lucas. "Energy system analysis is fertilizer complex - pinch analysis vs. Exergy analysis". Chemical Engineering & Technology 19, n.º 2 (abril de 1996): 192–95. http://dx.doi.org/10.1002/ceat.270190213.

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34

Paudel, Ekaraj, Ruud G. M. Van der Sman, Nieke Westerik, Ashutosh Ashutosh, Belinda P. C. Dewi y Remko M. Boom. "More efficient mushroom canning through pinch and exergy analysis". Journal of Food Engineering 195 (febrero de 2017): 105–13. http://dx.doi.org/10.1016/j.jfoodeng.2016.09.021.

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35

Yushkova, E. A. y V. A. Lebedev. "Exergy pinch analysis of the primary oil distillation unit". Journal of Physics: Conference Series 1399 (diciembre de 2019): 044072. http://dx.doi.org/10.1088/1742-6596/1399/4/044072.

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36

Goodarzvand-Chegini, Fatemeh y Esmaeil GhasemiKafrudi. "Application of exergy analysis to improve the heat integration efficiency in a hydrocracking process". Energy & Environment 28, n.º 5-6 (29 de junio de 2017): 564–79. http://dx.doi.org/10.1177/0958305x17715767.

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Heat integration techniques are now widely used for energy saving in petroleum processes. In this paper, an industrial hydrocracking process (UOP license) is retrofitted by pinch analysis as a significant tool for heat integration. The hydrocracking process is a main important conversion process in oil refineries and there has been sustained effort to improve its energy efficiency. Application of pinch analysis in retrofit of this process shows the heat exchanger network is operated efficiently. However, a large amount of energy is wasted from the hydrocracking unit, which their condition make no of use directly by the process during pinch analysis. Actually, most of the refining petroleum processes use considerably more energy than the operational minimum energy requirements because of their energy losses. These external energy losses are due to many factors, including normally inefficient or outdated equipment and process design, inadequate heat recovery, and poor integration of heat sources and sinks. However, without identifying the quality of the energy losses, it is difficult to determine how much of that energy is feasible to recover under realistic plant operating conditions. This is where exergy analysis can significantly assist in determining energy recovery opportunities. Thus, this paper is addressed to researchers who are assessing the quality of energy wasted in hydrocracking process, by using the principles of both pinch and exergy analysis. Based on the result obtained, the flue gas exhaust and the high pressure drop in reaction section can be considered as the exergy loss sources in this process. Moreover, the portion of waste energy that can be practically recovered is quantified.
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37

Zheng, Yong. "Optimization of Chenzhuang Combined Station through Pinch Analysis". Journal of Physics: Conference Series 2442, n.º 1 (1 de febrero de 2023): 012036. http://dx.doi.org/10.1088/1742-6596/2442/1/012036.

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Abstract The energy flow relation in the heating and heat exchanging process in a combined station is complicated. The heat exchanging network of Chenzhuang combined station has unreasonable energy utilization. First, pinch analysis for Chenzhuang combined station is performed by selecting pinch temperature differences within a reasonable temperature range. The pinch situation and minimum heating and cooling load are determined through the problem table. Then the energy-saving potential of the heat-exchanging network, which is optimized and retrofitted, is calculated. Finally, according to the results of energy costs and heat exchanger costs, the relationship between minimum pinch temperature difference and costs is plotted, with obtaining the optimal pinch temperature difference. Hereafter, pinch analysis is performed again, and the pinch temperature and energy-saving potential are calculated under the optimal pinch temperature difference. The results show that when the temperature difference of the pinch point is 20°C, the total cost of the corresponding combined station is the lowest, and the energy-saving potential reaches 14.3%.
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38

Ma, Wenjiao, Shuguang Xiang y Li Xia. "Energy-Saving Analysis of Epichlorohydrin Plant Based on Entransy". Processes 11, n.º 3 (20 de marzo de 2023): 954. http://dx.doi.org/10.3390/pr11030954.

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To improve energy efficiency and to recover energy, various mathematical models, such as pinch analysis, entropy analysis, exergy analysis, and entransy analysis, have been established to analyze heat transfer networks. In this study, these methods were applied to analyze the energy-saving effect of the epichlorohydrin unit in a certain enterprise. The results showed that when the minimum heat transfer temperature difference (ΔTmin) was 10K, 15K, and 20K, the efficiencies of the second law of thermodynamics calculated by entropy analysis were 88.02%, 93.52%, and 99.49%, respectively. The analytical method calculated an efficiency of 61.01%, 59.28%, and 57.27%, respectively, with public works’ savings of 16.59%, 14.86%, and 12.02%. The pinch analysis method achieved public works’ savings of 22.80%, 21.50%, and 19.35%. The entransy analysis method calculated an entransy transfer efficiency of 42.81%, 42.13%, and 41.00%, respectively, with public works’ savings of 19.41%, 18.01%, and 15.70%. Based on the results, entropy analysis was found to be contrary to the principle of minimum entropy production. Exergy analysis was not able to establish a heat transfer network. The pinch analysis method was not suitable for determining the thermal efficiency of a heat transfer network as the criterion for evaluating energy saving. On the other hand, the entransy analysis method was able to establish a heat transfer network and evaluate the heat utilization of the network by entransy transfer efficiency. Overall, the data analysis was reasonable.
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39

Ali, Emad y Mohamed Hadj-Kali. "Energy efficiency analysis of styrene production by adiabatic ethylbenzene dehydrogenation using exergy analysis and heat integration". Polish Journal of Chemical Technology 20, n.º 1 (1 de marzo de 2018): 35–46. http://dx.doi.org/10.2478/pjct-2018-0006.

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Abstract Styrene is a valuable commodity for polymer industries. The main route for producing styrene by dehydrogenation of ethylbenzene consumes a substantial amount of energy because of the use of high-temperature steam. In this work, the process energy requirements and recovery are studied using Exergy analysis and Heat Integration (HI) based on Pinch design method. The amount of steam plays a key role in the trade-off between Styrene yield and energy savings. Therefore, optimizing the operating conditions for energy reduction is infeasible. Heat integration indicated an insignificant reduction in the net energy demand and exergy losses, but 24% and 34% saving in external heating and cooling duties, respectively. When the required steam is generated by recovering the heat of the hot reactor effluent, a considerable saving in the net energy demand, as well as the heating and cooling utilities, can be achieved. Moreover, around 68% reduction in the exergy destruction is observed.
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40

Moharamian, Anahita, Saeed Soltani, Faramarz Ranjbar, Mortaza Yari y Marc A. Rosen. "Thermodynamic analysis of a wall mounted gas boiler with an organic Rankine cycle and hydrogen production unit". Energy & Environment 28, n.º 7 (4 de agosto de 2017): 725–43. http://dx.doi.org/10.1177/0958305x17724211.

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A novel cogeneration system based on a wall mounted gas boiler and an organic Rankine cycle with a hydrogen production unit is proposed and assessed based on energy and exergy analyses. The system is proposed in order to have cogenerational functionality and assessed for the first time. A theoretical research approach is used. The results indicate that the most appropriate organic working fluids for the organic Rankine cycle are HFE700 and isopentane. Utilizing these working fluids increases the energy efficiency of the integrated wall mounted gas boiler and organic Rankine cycle system by about 1% and the organic Rankine cycle net power output about 0.238 kW compared to when the systems are separate. Furthermore, increasing the turbine inlet pressure causes the net power output, the organic Rankine cycle energy and exergy efficiencies, and the cogeneration system exergy efficiency to rise. The organic Rankine cycle turbine inlet pressure has a negligible effect on the organic Rankine cycle mass flow rate. Increasing the pinch point temperature decreases the organic Rankine cycle turbine net output power. Finally, increasing the turbine inlet pressure causes the hydrogen production rate to increase; the highest and lowest hydrogen production rates are observed for the working fluids for HFE7000 and isobutane, respectively. Increasing the pinch point temperature decreases the hydrogen production rate. In the cogeneration system, the highest exergy destruction rate is exhibited by the wall mounted gas boiler, followed by the organic Rankine cycle evaporator, the organic Rankine cycle turbine, the organic Rankine cycle condenser, the proton exchange membrane electrolyzer, and the organic Rankine cycle pump, respectively.
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41

Sun, Wenxu y Zhan Liu. "Parametric Assessment on the Advanced Exergy Performance of a CO2 Energy Storage Based Trigeneration System". Applied Sciences 10, n.º 23 (24 de noviembre de 2020): 8341. http://dx.doi.org/10.3390/app10238341.

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In this paper, conventional and advanced exergy analyses are comprehensively introduced on an innovative transcritical CO2 energy storage based trigeneration system. Conventional exergy analysis can quantify in an independent way the component exergy destruction. However, the advanced technology is able to evaluate the interactions among components and identify the tangible promotion potential by allowing for the technical and economic limitations. In this method, the component exergy destruction is separated into avoidable and unavoidable parts, as well as the endogenous/exogenous parts. Calculation of the split parts is carried out by utilizing the thermodynamic cycle-based approach. Results coming from conventional exergy analysis indicate that the first three largest exergy destructions are given by cold storage, compressor 1, and heat exchanger 3. However, advanced analysis results demonstrate that the cold storage, compressor 1, and compressor 2 should be given the first improvement priority in sequence by depending on the avoidable exergy destruction. The turbine efficiency produces a higher impact on overall exergy destruction than compressor efficiency. The pinch temperature in cold storage causes the highest effect on exergy destruction amongst all the heat exchangers. There exists an optimum value in the compressor inlet pressure and ambient temperature.
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42

Sun, Enhui, Han Hu, Hangning Li, Chao Liu y Jinliang Xu. "How to Construct a Combined S-CO2 Cycle for Coal Fired Power Plant?" Entropy 21, n.º 1 (27 de diciembre de 2018): 19. http://dx.doi.org/10.3390/e21010019.

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It is difficult to recover the residual heat from flue gas when supercritical carbon dioxide (S-CO2) cycle is used for a coal fired power plant, due to the higher CO2 temperature in tail flue and the limited air temperature in air preheater. The combined cycle is helpful for residual heat recovery. Thus, it is important to build an efficient bottom cycle. In this paper, we proposed a novel exergy destruction control strategy during residual heat recovery to equal and minimize the exergy destruction for different bottom cycles. Five bottom cycles are analyzed to identify their differences in thermal efficiencies (ηth,b), and the CO2 temperature entering the bottom cycle heater (T4b) etc. We show that the exergy destruction can be minimized by a suitable pinch temperature between flue gas and CO2 in the heater via adjusting T4b. Among the five bottom cycles, either the recompression cycle (RC) or the partial cooling cycle (PACC) exhibits good performance. The power generation efficiency is 47.04% when the vapor parameters of CO2 are 620/30 MPa, with the double-reheating-recompression cycle as the top cycle, and RC as the bottom cycle. Such efficiency is higher than that of the supercritical water cycle power plant.
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43

WANG, C., C. GUANG, Z. S. ZHANG y J. GAO. "DESIGN AND OPTIMIZATION OF HEAT EXCHANGE NETWORK AND EXERGY ANALYSIS FOR METHANATION PROCESS OF COAL-GAS". Latin American Applied Research - An international journal 49, n.º 1 (31 de enero de 2019): 47–54. http://dx.doi.org/10.52292/j.laar.2019.284.

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It has the significant meaning to design an energy-efficient heat exchange network (HEN) for the methanation process in the coal-gas industry in China. In this work, HENs are set up to produce multiple saturated steams with different pressure levels by software design and manual retrofit methodology based on pinch analysis, and evaluated from the economic and exergetic viewpoints. The result shows that high pressure steam (312℃, 10Mpa, 13000kg/h) and medium pressure saturated steam (175℃, 0.9Mpa, 500kg/h) can be cogenerated by the optimal HEN with lower exergy loss and economic cost as well as higher exergy efficiency.
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44

Linnhoff, B. "Pinch Technology for the Synthesis of Optimal Heat and Power Systems". Journal of Energy Resources Technology 111, n.º 3 (1 de septiembre de 1989): 137–47. http://dx.doi.org/10.1115/1.3231415.

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Over recent years a new methodology for the analysis and design of heat exchanger networks, called pinch technology, has led to significant energy savings in the chemical and process industries. The methodology has later been extended to apply to integrated heat and power systems (Townsend and Linnhoff, 1983). This paper shows that pinch technology is firmly based in Second Law Analysis. In contrast to conventional Second Law Analysis, however, it does not require a base case design. Rather, it performs true synthesis. Also, it is capable of a methodical distinction between “inevitable” and “avoidable” exergy losses.
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45

Barari, Bamdad, Abbasian Shirazi, Mohsen Keshavarzi y Iman Rostamsowlat. "Numerical analysis and field study of time dependent exergy-energy of a gas-steam combined cycle". Journal of the Serbian Chemical Society 77, n.º 7 (2012): 945–57. http://dx.doi.org/10.2298/jsc110708014b.

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In this study, time dependent exergy analysis of the Fars Combined Power Plant Cycle has been investigated. Exergy analysis has been used for investigating each part of actual combined cycle by considering irreversibility from Apr 2006 to Oct 2010. Performance analysis has been done for each part by evaluating exergy destruction in each month. By using of exergy analysis, aging of each part has been evaluated respect to time duration. In addition, the rate of lost work for each month has been calculated and variation of this parameter has been considered as a function of aging rate. Finally, effects of exergy destruction of each part have been investigated on exergy destruction of whole cycle. Entire analysis has been done for Unit 3 and 4 of gas turbine cycle which combined by Unit B of steam cycle in Fars Combined Power Plant Cycle located in Fars province in Iran.
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46

Abutorabi, Hossein y Ehsan Kianpour. "Modeling, exergy analysis and optimization of cement plant industry". Journal of Mechanical and Energy Engineering 6, n.º 1 (1 de julio de 2022): 55–66. http://dx.doi.org/10.30464/jmee.2022.6.1.55.

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Cement is the most widely used man-made material. The global cement industry produces about 3.3 billion tons of cement annually. A lot of energy is needed to produce cement. About 200 kg of coal is used to produce each ton of cement. The cement industry also produces about five percent of the world's greenhouse gases. In order to reduce the use of fossil fuels and greenhouse gas emissions, some cement producers have the potential to recover waste heat. The method studied in this research is based on heat recovery from boilers installed at the outlet of clinker cooler and preheater of cement factory. Due to the low temperature of the gases available, three different fluids, water, R123 and R245fa are considered as the operating fluid. Also, energy and exergy analysis is performed in a Rankin cycle and the selection of optimal parameters is considered by using genetic algorithm. By selecting the decision parameters in the optimization of the genetic algorithm such as pinch temperature, evaporator pressure and operating mass flow rate, the optimal values of exergy efficiency were obtained.
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47

Facchini, Bruno, Daniele Fiaschi y Giampaolo Manfrida. "Exergy Analysis of Combined Cycles Using Latest Generation Gas Turbines". Journal of Engineering for Gas Turbines and Power 122, n.º 2 (3 de enero de 2000): 233–38. http://dx.doi.org/10.1115/1.483200.

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The potential performance of optimized gas-steam combined cycles built around latest-generation gas turbine engines is analyzed, by means of energy/exergy balances. The options here considered are the reheat gas turbine and the H-series with closed-loop steam blade cooling. Simulations of performance were run using a well-tested Modular Code developed at the Department of Energy Engineering of Florence and subsequently improved to include the calculation of exergy destruction of all types (heat transfer, friction, mixing, and chemical irreversibilities). The blade cooling process is analyzed in detail as it is recognized to be of capital importance for performance optimization. The distributions of the relative exergy destruction for the two solutions—both capable of achieving energy/exergy efficiencies in the range of 60 percent—are compared and the potential for improvement is discussed. [S0742-4795(00)00902-9]
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48

Bandyopadhyay, Rajarshi, Ole Frej Alkilde y Sreedevi Upadhyayula. "Applying pinch and exergy analysis for energy efficient design of diesel hydrotreating unit". Journal of Cleaner Production 232 (septiembre de 2019): 337–49. http://dx.doi.org/10.1016/j.jclepro.2019.05.277.

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49

Xia, Xiao Xia, Nai Jun Zhou y Zhi Qi Wang. "Exergy Analysis of Energy Consumption for Central Air Conditioning System". Applied Mechanics and Materials 628 (septiembre de 2014): 332–37. http://dx.doi.org/10.4028/www.scientific.net/amm.628.332.

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The energy consumption of several central air conditioning systems in summer was researched by the method of exergy analysis. Combined with actual example,the exergy loss of all the equipments and the exergy efficiency of three systems were calculated. The results show that the exergy efficiency of three systems is very low. Relatively speaking, the exergy efficiency of primary return air conditioning system with supplying air in dew point is highest. The equipment of highest exergy loss is air-conditioned room, while the exergy loss of surface air cooler is smallest. Based on this, several improvement measures were proposed to reduce exergy loss and improve exergy efficiency.
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50

Galimova, L. V. y D. Z. Bairamov. "Thermodynamic analysis of combined cycle plant operation as part of an energy-saving system based on an absorption bromide-lithium refrigerating machine". Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering 4, n.º 4 (2020): 57–65. http://dx.doi.org/10.25206/2588-0373-2020-4-4-57-65.

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The main directions of research of the current energy-generating system, taking into account its technical limitations, are optimization and forecasting based on the analysis of its operating modes. Thermodynamic analysis involves determining the efficiency of the system based on the research of exergy efficiency and exergy losses. In this project, we propose methodic and results of exergy analysis of combined cycle gas plant operation as an object of energy production, the efficiency which is provided by cooling the outdoor air using an absorption bromide-lithium refrigerating machine. Conducting exergy analysis for determination of exergy destruction allow to determine the potential for increasing the efficiency of the system. A flow graph and an incident matrix are presented. The exergy efficiency of the combined cycle gas plant under the specified conditions is 46,5%. Based on the exergy analysis, the final diagram of the distribution of fluxes and losses of exergy of the combined cycle gas plant is presented
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