Thermodynamic analysis and optimization of an integrated solar thermochemical hydrogen production system

Sadeghi, Shayan; Ghandehariun, Samane

doi:10.1016/j.ijhydene.2020.07.203

Cited by 49 publications

(11 citation statements)

References 34 publications

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“…As it can be seen, even though the proposed process contains a power generation unit, has higher efficiency rather than Temiz and Dincer 67 and Yilmaz and Selbaş 43 works. In Sadeghi and Ghandehariun 65 and Lee et al 66 works because of employing a sustainable energy source such as PCM energy storage, the system obtains higher efficiency than the presented work.…”

Section: Model Validationmentioning

confidence: 70%

Investigation of hydrogen production by sulfur‐iodine thermochemical water splitting cycle using renewable energy source

Mehrpooya

Ghorbani

Ekrataleshian

et al. 2021

Intl J of Energy Research

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In this study, a novel integrated structure for generation of the oxygen, hydrogen, power, and hot water by employing thermochemical reactors and solar dish collectors is proposed. The presented process including solar dish collectors, sulfuriodine thermochemical cycle, and Organic Rankine Cycle. In this configuration, for 5854 kmol/h of inlet water, 2236 kmol/h of oxygen, and 4432 kmol/h of hydrogen are produced. This system can provide 22 666 kW of power that 22 026 kW is utilized in the sulfur-iodine reaction. So, the net electrical power is found to be 640 kW. A general exergy analysis is carried out on the whole structure and equipment to find its exergy losses and improvement potential to enhance the exergy efficiency of the system. The total exergy efficiency of the process is calculated 56.33% and its exergy destruction is obtained 382 301.31 kW.Heat exchangers and solar collectors have the highest values of destructed exergy, which about 69% of destructed exergy is related to them. These devices have a strong potential for enhancement. The results showed that component P1 (pump) has the lowest exergy efficiency that is 15.58%, while its exergy destruction is not the greatest. Therefore, for having a better examination of this structure, both exergy efficiency and exergy destruction parameters should be evaluated simultaneously. Moreover, a sensitivity analysis is applied to survey the performance of some performance indicators vs different design parameters. It is concluded that by an increase in generated heat by solar collectors, exergy efficiency, energy efficiency, oxygen, and hydrogen production faces increment.

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Section: Model Validationmentioning

confidence: 70%

Investigation of hydrogen production by sulfur‐iodine thermochemical water splitting cycle using renewable energy source

Mehrpooya

Ghorbani

Ekrataleshian

et al. 2021

Intl J of Energy Research

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show abstract

“…24,26 In addition, it is reported that the lowest process heat supply temperature should be about 50 C higher than the thermochemical cycle's minimum temperature requirement. 38 In this work, the temperatures of the helium heat carrier entering and exiting the Cu-Cl plant are considered to be 580 C 39 and 400 C 40 respectively.…”

Section: Parameter Settingsmentioning

confidence: 99%

Thermodynamic analysis and optimization of the combined supercritical carbon dioxide Brayton cycle and organic Rankine cycle‐based nuclear hydrogen production system

Wang

Liu

Luo

et al. 2021

Intl J of Energy Research

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The Supercritical Carbon Dioxide Brayton Cycle (SCBC) with high efficiency is a very promising thermodynamic cycle to replace the Steam Rankine Cycle (SRC) as the power cycle of a Nuclear Hydrogen Production (NHP) system. However, detailed research on the NHP system using SCBC as a power cycle has not been carried out so far and the system's thermodynamic characteristics are not well known. To fill this research gap, three promising very high-temperature gas-cooled reactor and copper-chlorine cycle-based NHP systems using different power cycles including SRC, SCBC, and combined SCBC and Organic Rankine Cycle (ORC) are proposed and studied in this work. The energy and exergy analysis method and the particle-swarm optimization algorithm have been used respectively to model and optimize the system. In addition, a parametric analysis based on two typical reactor concepts has been performed to comprehensively investigate the system's thermodynamic characteristics. Finally, a performance comparison of three systems under different hydrogen production loads has been conducted. Major results show that under different hydrogen production loads, the variations in the thermodynamic performance of the SCBC-based NHP system are sensitive to the reactor inlet temperature.Under low reactor inlet temperatures (≤587 C), the thermal efficiency of the SCBC is less than 37%. Besides, increasing the compressor pressure ratio of SCBC can enhance the system's thermodynamic performance, and the system's thermal and exergy efficiencies are improved by about 0.7% to 3.7% and 1.0% to 5.3% respectively by using ORC.

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“…As mentioned earlier, a high temperature latent heat TES medium is utilized to achieve higher efficiency in the unfired gas turbine cycle. The PCM considered here is a eutectic mixture of CaF2( 49)-CaSO4(41.4)-CaMoO4(9.6) with the melting temperature of 943 ℃ [34].…”

Section: Solar Heliostat Field and Pressurized Cavity Receivermentioning

confidence: 99%

“…The proposed multigeneration system includes a solar heliostat field, pressurized cavity receiver, PCM tank, unfired gas turbine cycle, four-step Cu-Cl cycle, heat recovery steam generator unit and regenerative Rankine cycle. The TES material selected for this study is an eutectic mixture of CaF2( 49)-CaSO4(41.4)-CaMoO4(9.6) fluoride salt with melting temperature of 943 ℃ and fusion enthalpy of 237 kJ/kg [34].…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analyses of a solar-based multi-generation energy plant integrated with heat recovery and thermal energy storage systems

Sadeghi

Ghandehariun

Rezaie

2021

Applied Thermal Engineering

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An innovative multigeneration energy system driven by solar energy is proposed in this paper. The integrated model produces electricity, hydrogen, oxygen, and steam for heating purposes. The energy system comprises of pressurized cavity based solar power tower, latent thermal energy storage (TES) unit, unfired gas turbine (GT) unit, regenerative steam Rankine cycle (SRC), copper-chlorine (Cu-Cl) thermochemical cycle, and heat recovery units. By utilization of a high temperature ternary eutectic phase change material (PCM), a dynamic model is developed to deal with the intermittency of the solar energy. Using energy and exergy approaches, the proposed system is investigated to assess exergy destruction rates and the overall system performance. A parametric study is performed to investigate the influence of design parameters such as number of heliostats, pressure ratio of GT, and temperatures of reactions on the system performance. The results showed that the energy system produces electricity, steam, hydrogen, and oxygen at a rate of 41.9 MW, 12.6 kg/s, 0.19 kg/s, and 0.76 kg/s, respectively. Energy and exergy efficiencies of the integrated system are found to be 49.9%, and 44.9%, respectively.

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Thermodynamic analysis and optimization of an integrated solar thermochemical hydrogen production system

Cited by 49 publications

References 34 publications

Investigation of hydrogen production by sulfur‐iodine thermochemical water splitting cycle using renewable energy source

Investigation of hydrogen production by sulfur‐iodine thermochemical water splitting cycle using renewable energy source

Thermodynamic analysis and optimization of the combined supercritical carbon dioxide Brayton cycle and organic Rankine cycle‐based nuclear hydrogen production system

Energy and exergy analyses of a solar-based multi-generation energy plant integrated with heat recovery and thermal energy storage systems

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