Energy, exergy and environmental analysis of a novel combined system producing power, water and hydrogen

Parham, Kiyan; Alimoradiyan, Hamed; Assadi, Mohsen

doi:10.1016/j.energy.2017.06.016

Cited by 24 publications

(7 citation statements)

References 30 publications

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“…Considering the heat source temperature variation from 110°C to 200°C, and the available range of thermal power from the cell, it is decided that the ORC is the most suitable fit for this application. Organic Rankine cycle is an outstanding cycle for taking advantage of mid‐/low‐level temperature sources and power generation by means of a turbine . It is worth mentioning that both the first and second law efficiencies of ORC depend on heat sink temperature .…”

Section: Heat Utilization System Design Modelling and Evaluationmentioning

confidence: 99%

“…Organic Rankine cycle is an outstanding cycle for taking advantage of mid-/low-level temperature sources and power generation by means of a turbine. 19 It is worth mentioning that both the first and second law efficiencies of ORC depend on heat sink temperature. 20 The design aspects and equipment specifications of an appropriate ORC for coupling with the proposed system are investigated and presented in the following sections.…”

Section: Heat Utilization System Design Modelling and Evaluationmentioning

confidence: 99%

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A waste heat recovery system development and analysis using ORC for the energy efficiency improvement in aluminium electrolysis cells

2017

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Summary The present work investigates an active waste heat recovery system for the side walls of the aluminium electrolysis cells, enabling utilization of the extracted heat in power generation. This will potentially lead to energy efficiency improvement in the primary aluminium production industry and an enhanced aluminium production rate. An experimentally validated loop thermosyphon heat pipe model was used for heat extraction from the cell side wall. Boosting system thermal efficiency through waste heat recovery, by means of a heat utilization system, and increasing the level of control, as well as thermal equilibrium, stand as the main addressed objectives of the current study, which consequently result in an increased aluminium production rate. An organic Rankine cycle is incorporated into the system, and its performance is evaluated, taking into consideration the operating situations in terms of available temperature and thermal power range.

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Section: Heat Utilization System Design Modelling and Evaluationmentioning

confidence: 99%

Section: Heat Utilization System Design Modelling and Evaluationmentioning

confidence: 99%

A waste heat recovery system development and analysis using ORC for the energy efficiency improvement in aluminium electrolysis cells

2017

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“…The results showed a good conversion efficiency with improved system performance. Similarly, other researchers [23][24][25][26] investigated an energy-based multi-generation plant, with ORC and Kalina cycle as the bottoming plants. Marques et al [5] conducted exergoeconomic analysis of a macro-trigeneration system.…”

Section: Introductionmentioning

confidence: 99%

Exergoeconomic and Environmental Modeling of Integrated Polygeneration Power Plant with Biomass-Based Syngas Supplemental Firing

et al. 2020

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There is a burden of adequate energy supply for meeting demand and reducing emission to avoid the average global temperature of above 2 °C of the pre-industrial era. Therefore, this study presents the exergoeconomic and environmental analysis of a proposed integrated multi-generation plant (IMP), with supplemental biomass-based syngas firing. An in-service gas turbine plant, fired by natural gas, was retrofitted with a gas turbine (GT), steam turbine (ST), organic Rankine cycle (ORC) for cooling and power production, a modified Kalina cycle (KC) for power production and cooling, and a vapour absorption system (VAB) for cooling. The overall network, energy efficiency, and exergy efficiency of the IMP were estimated at 183 MW, 61.50% and 44.22%, respectively. The specific emissions were estimated at 122.2, 0.222, and 3.0 × 10−7 kg/MWh for CO2, NOx, and CO, respectively. Similarly, the harmful fuel emission factor, and newly introduced sustainability indicators—exergo-thermal index (ETI) and exergetic utility exponent (EUE)—were obtained as 0.00067, 0.675, and 0.734, respectively. The LCC of $1.58 million was obtained, with a payback of 4 years, while the unit cost of energy was estimated at 0.0166 $/kWh. The exergoeconomic factor and the relative cost difference of the IMP were obtained as 50.37% and 162.38%, respectively. The optimum operating parameters obtained by a genetic algorithm gave the plant’s total cost rate of 125.83 $/hr and exergy efficiency of 39.50%. The proposed system had the potential to drive the current energy transition crisis caused by the COVID-19 pandemic shock in the energy sector.

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“…A tri-generation ORC was investigated from exergoenvironmental point of view by Ahmadi et al [17], while a small scale integrated hydrogen and power generation system was exergo-economically analyzed by Caliskan et al [18]. Parham et al [19] accomplished a comprehensive thermodynamic and environmental analysis of a multi-production system having ORC, internal heat exchanger, open absorption heat transformation and an electrolyser. Hydrogen can be used as a fuel and offers exceptional advantages helping hydrogen to become one of the most important energy carrier in the future [20].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of solar assisted multigenerational system using therminol VP1 based nanofluids: A comparative study

et al. 2020

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The application of the nanofluids is suggested to enhance and improve the efficiency of solar thermal power system. In the present study, three different nanofluids (Fe2O3/therminol VP1, SiO2/therminol VP1, and Cu/therminol VP1) are numerically investigated in parabolic dish solar collector that is further integrated to a combined cycle for power and hydrogen production. Heat rejects from the power cycle is also utilized to drive a single effect absorption (LiBr-water) system. Furthermore, a comprehensive energy, exergy and exergo-environmental analysis are carried out by varying several input parameters and their influence on overall energetic and exergetic efficiencies, network output and rate of hydrogen generation is assessed. The engineering equation solver is employed to conduct the parametric study. Outcomes of the study demonstrate that the SiO2/VP1 has the better characteristics among the investigated nanofluids. The overall energetic efficiency of the SiO2/VP1, Fe2O3/VP1, and Cu/VP1 is almost 38.79%, 38.74%, and 37.53%, while overall exergetic efficiency is 41.72%, 41.66%, and 40.36%, respectively at 1000 Wm-2. The exergoenvironmental impact coefficient and impact index are noticed to be reduced for all the three nanofluids as mass-flow rate increases. The hy-drogen production rate for SiO2/VP1 is maximum and has observed to be increased by increasing the ambient temperature. Increase in nanoparticles concentration also rises the exergetic efficiency but reduces the thermal conductivity of the nanofluids. Coefficient of performance is noticed to be increased with rise in evaporator temperature, whereas, it is reduced by increasing the generator temperature.

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Energy, exergy and environmental analysis of a novel combined system producing power, water and hydrogen

Cited by 24 publications

References 30 publications

A waste heat recovery system development and analysis using ORC for the energy efficiency improvement in aluminium electrolysis cells

A waste heat recovery system development and analysis using ORC for the energy efficiency improvement in aluminium electrolysis cells

Exergoeconomic and Environmental Modeling of Integrated Polygeneration Power Plant with Biomass-Based Syngas Supplemental Firing

Performance analysis of solar assisted multigenerational system using therminol VP1 based nanofluids: A comparative study

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