The Experts below are selected from a list of 11550 Experts worldwide ranked by ideXlab platform
Wafa Ben Youssef - One of the best experts on this subject based on the ideXlab platform.
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assessment viability of a concentrating photovoltaic thermal energy Cogeneration System cpv t with storage for a textile industry application
Solar Energy, 2018Co-Authors: Wafa Ben Youssef, Taher Maatallah, Christophe Menezo, Sassi Ben NasrallahAbstract:Abstract In this paper, a simulation model of a Concentrating Photovoltaic Thermal-energy Cogeneration System (CPV/T) is investigated in order to evaluate its thermal and electrical performances for hot water loads referring to a textile industry application. Simultaneous production of electrical and high-grade thermal energy is provided with a CPV/T System at high temperature. The electrical and thermal performances of the System operating in Monastir city, Tunisia, are numerically investigated. Using our developed simulation, the heat and electrical power of the System have been analyzed for four typical days of the year. Furthermore, the effect of water flow rate, the outlet fluid temperature and the loss coefficient of the collector have been involved to identify their impact on the output power. The simulation process led to evaluate the energy feasibility of the CPV/T System and a comprehensive economic analysis study of the System under investigation was performed proving its viability in comparison with the conventional one.
Sassi Ben Nasrallah - One of the best experts on this subject based on the ideXlab platform.
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assessment viability of a concentrating photovoltaic thermal energy Cogeneration System cpv t with storage for a textile industry application
Solar Energy, 2018Co-Authors: Wafa Ben Youssef, Taher Maatallah, Christophe Menezo, Sassi Ben NasrallahAbstract:Abstract In this paper, a simulation model of a Concentrating Photovoltaic Thermal-energy Cogeneration System (CPV/T) is investigated in order to evaluate its thermal and electrical performances for hot water loads referring to a textile industry application. Simultaneous production of electrical and high-grade thermal energy is provided with a CPV/T System at high temperature. The electrical and thermal performances of the System operating in Monastir city, Tunisia, are numerically investigated. Using our developed simulation, the heat and electrical power of the System have been analyzed for four typical days of the year. Furthermore, the effect of water flow rate, the outlet fluid temperature and the loss coefficient of the collector have been involved to identify their impact on the output power. The simulation process led to evaluate the energy feasibility of the CPV/T System and a comprehensive economic analysis study of the System under investigation was performed proving its viability in comparison with the conventional one.
Laura Vanoli - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of a biomass powered micro Cogeneration System based on gasification and syngas conversion in a reciprocating engine
Energy Conversion and Management, 2018Co-Authors: M La Villetta, M Costa, D Cirillo, N Massarotti, Laura VanoliAbstract:Abstract The present paper describes an experimental characterisation of a biomass powered micro-Cogeneration System based on the coupling between a gasifier and an internal combustion engine. The ECO 20 unit is sized to deliver a maximum electrical and thermal power of 20 kWe and 40 kWth, respectively. In order to highlight possible inefficiencies along the biomass-to-energy conversion chain, the global energy balance of the System under real working conditions is derived. Ultimate and proximate analyses of the processed biomass are performed, accompanied by temperature and mass flow rate measurements and gas chromatograph characterization of collected samples of the produced syngas. The greatest inefficiency is found in the gasification section with a value of the cold gas efficiency in the range of 57–60%. The low quality of the syngas (lower heating value equal to 3731 kJ/Nm3) affects the engine combustion efficiency, hence its electrical efficiency that does not exceed 22.5%. The global electrical efficiency of the plant is equal to about 13.5%. As a further analysis, waste heat recovery is considered under different conditions by decreasing the temperature of the water flowing in the secondary circuit from 68.35 °C to 20.50 °C for the use of the provided thermal energy. This determines an increase of the thermal efficiency of the engine from 11.3% to 56.2%, while the global thermal efficiency increases from 6.46% to 33.72%. A feature of the ECO 20 System is the cooling of the syngas delivered to the engine by its same cooling water, for a considerable advantage on volumetric efficiency with respect to other analogous Systems, also in the cases the thermal power is not utilised.
Hassan K Abdulrahim - One of the best experts on this subject based on the ideXlab platform.
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the effect of elevated inlet air temperature and relative humidity on gas turbine Cogeneration System exergy assessment
International Journal of Exergy, 2011Co-Authors: F N Alasfour, S F Alfahed, Hassan K AbdulrahimAbstract:This research aims to quantify the exergy destructions of Gas Turbine (GT) Cogeneration System under different inlet air temperatures and humidity. Three different Cogeneration schemes were examined in this research: conventional GT, GT-Single Pressure HRSG and GT-Dual Pressure HRSG. A parametric study was carried out in terms of exergy destruction and second-law efficiency. The exergy utilisation factor had been investigated in this research. Results showed that inlet air temperature and relative humidity play an important role in determining exergetic performance. Integrating GT with dual pressure HRSG can be considered as an option during summer season and would improve the production of electricity and desalted water.
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the effect of elevated inlet air temperature and relative humidity on Cogeneration System
International Journal of Energy Research, 2009Co-Authors: S F Alfahed, F N Alasfour, Hassan K AbdulrahimAbstract:The effect of elevated inlet air temperature and relative humidity on a gas turbine (GT) Cogeneration System performance was investigated. The analysis was carried out on a GT of a capacity 171 MW at ISO condition, which is integrated with a dual pressure heat recovery steam generator (HRSG), the Cogeneration System had been tested under Kuwait summer climate conditions. A computational model was developed and solved using engineering equation solver professional package to investigate the performance of a dual pressure GT-HRSG System. The suggested HRSG is capable of producing high-pressure superheated steam at 150 bar and 510°C to operate a power generation steam turbine cycle, and a medium pressure saturated steam at 15 bar to run a thermal vapor compression (TVC) desalination System. In this research, the influence of elevated inlet air temperature and relative humidity on the energy assessment of the suggested Cogeneration System was thoroughly investigated. Results indicated that operating GT under elevated values of inlet air temperatures is characterized by low values of net power and thermal efficiency. At elevated inlet air temperatures, increasing relative humidity has a small positive impact on GT cycle net power and thermal efficiency. Integrating the GT with HRSG to generate steam for power generation and process heat tends to increase energy utilization factor of the System at elevated inlet air temperatures. Increasing inlet air temperature plays a negative impact on power to heat ratio (PHR), while relative humidity has no effect on PHR. Copyright © 2009 John Wiley & Sons, Ltd.
S M S Mahmoudi - One of the best experts on this subject based on the ideXlab platform.
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exergoeconomic analysis and optimization of a novel hybrid Cogeneration System high temperature proton exchange membrane fuel cell kalina cycle driven by solar energy
Energy Conversion and Management, 2019Co-Authors: Niloufar Sarabchi, Mortaza Yari, S M S Mahmoudi, Ali FarziAbstract:Abstract Designing energy conversion Systems with high efficiencies and low pollutant emission is essential for sustainable development. A new Cogeneration System including a high-temperature proton exchange membrane fuel cell, integrated with a solar methanol steam reformer, and a Kalina cycle is proposed to produce electricity and heat. Using energy, exergy and cost balance, the proposed System is analyzed from the viewpoints of exergy, economy, and environmental impact. A Parametric study is performed and shows that a higher fuel cell temperature is in favor of the total product unit cost and carbon dioxide mass specific emission. Also, the exergy efficiency is maximized, and the total product unit cost as well as the carbon dioxide mass specific emission are minimized at some specific values of anode recirculation ratio. Optimization results show that the average daily exergy efficiency can increase by up to 29.3% and the total product unit cost as well as the carbon dioxide mass specific emission can decrease by up to 17.72% and 16.3%, respectively compared to the corresponding values under the base conditions. It is concluded that combining a Kalina cycle with a high-temperature proton exchange membrane fuel cell along with utilizing solar energy for reforming process yields an efficient energy conversion System with low emission.
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exergy economic and environmental impact assessment and optimization of a novel Cogeneration System including a gas turbine a supercritical co2 and an organic rankine cycle gt hrsg sco2
Applied Thermal Engineering, 2017Co-Authors: Hossein Nami, S M S Mahmoudi, Arash NematiAbstract:Abstract Exergoeconomic and exergoenvironmental analyses are reported for a novel Cogeneration System including a gas turbine, a heat recovery steam generator, a supercritical carbon dioxide recompression Brayton cycle and an organic Rankine cycle. A comprehensive parametric study is carried out to clarify the effects of some decision parameters on the exergoeconomic performance of the proposed System. Also, the payback period is determined for the proposed System. The sum of capital investment cost, total exergy destruction cost and environmental impact cost is considered as an objective function which is optimized with respect to the decision parameters. The variation in overall exergoeconomic factor is determined and its implication to the System design is discussed. It is observed that under the optimized condition the average product unit cost of the System (cost of produced power and steam) is decreased by 0.56 $/GJ when compared to the value obtained under a base condition.
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proposal exergy analysis and optimization of a new biomass based Cogeneration System
Applied Thermal Engineering, 2016Co-Authors: Ehsan Gholamian, S M S Mahmoudi, V ZareAbstract:Abstract A new Cogeneration System consisting of a biomass gasifier, a gas turbine, a S-CO 2 cycle and a domestic water heater is proposed and analyzed in detail. Applying the conservation of mass and energy as well as the exergy balance for each System component and using the engineering equation solver (EES), the System performance is simulated. The combustion chamber and the gasifier are observed to be two major sources of irreversibility in the System. Through a parametric study it is observed that the gas turbine and the S-CO 2 turbine pressure ratios play key roles in the System performance. In addition, considering the System as a combination of three subSystems, i.e. the standalone gas turbine, the whole System without the domestic water heater (power generation System) and the Cogeneration System, an environmental impact assessment in terms of CO 2 emission is carried out. Wood and paper are examined as biomasses and it is observed that using wood leads to a maximum exergy efficiency of 40.11% with a CO 2 emission of 4.99 × 10 − 2 t / M W h for the Cogeneration System. The values of these parameters are 39.12% and 4.95 × 10 − 2 t / M W h when paper is used as biomass.