Article
Chemistry, Physical
Onur Oruc, Ibrahim Dincer
Summary: This study examines the Cobalt-Chlorine (Co-Cl) cycle in detail in terms of thermodynamics as a carbon-free and sustainable hydrogen production method. Results show that the cycle has an exergy efficiency of 33%, with the hydrolysis reaction leading to the greatest exergy destruction and the hydrochlorination reaction having the lowest exergy destruction. In terms of kinetics, the high exergy efficiency indicates that the cycle is feasible in terms of thermodynamics.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Aysenur Ozdemir, Gamze Genc
Summary: This paper presents an analysis of energy and exergy for a thermochemical hydrogen production facility based on solar power. Different thermochemical cycles are compared, and the use of a recompression S-CO2 Brayton power cycle is found to enhance system performance. The maximum achieved efficiency is 27%, and the energy and exergy efficiencies vary with solar radiation and concentration ratio. The solar energy unit is identified as the main source of exergy destruction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Yarkin Gevez, Ibrahim Dincer
Summary: This study presents a novel integrated energy system based on renewable geothermal energy source with a Copper Chlorine (CuCl) thermochemical cycle for hydrogen production production and a multistage desalination subsystem for freshwater production. The system achieves high efficiency in terms of energy and exergy through thermodynamic analysis. Parametric studies are conducted to observe the effects of different conditions on the system.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Onur Oruc, Ibrahim Dincer
Summary: This study focuses on the system integration approach of the NaOH thermochemical cycle for hydrogen production, utilizing Aspen Plus and SAM software to simulate and generate high efficiency hydrogen and electricity.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Fatih Sorgulu, Ibrahim Dincer
Summary: This study assesses a newly developed solar energy-driven thermochemical cycle for hydrogen generation and injection into the natural gas pipeline. The blended hydrogen, produced by the heavy element halide cycle, is utilized in gas turbine systems, gas cookers, and combi boilers in a community. Desalination units are integrated to produce freshwater for the community. The overall exergetic and energetic efficiencies of the integrated system are obtained as 21.3% and 26.1% for the selected operating conditions.
Article
Green & Sustainable Science & Technology
Mert Temiz, Ibrahim Dincer
Summary: This study investigates a newly developed supercritical geothermal and solar-based integrated energy system applied to a local community in Japan. The system integrates various subsystems including thermochemical copper-chlorine cycle, bifacial photovoltaic plant, Rankine cycle, heat pump, and multi-effect water desalination to produce electricity, heat, and freshwater from solar, geothermal, and sea sources.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Chemistry, Physical
Merve Ozturk, Ibrahim Dincer
Summary: This study presents an analysis and assessment study of an integrated system for producing ammonia, consisting of a cryogenic air separation unit, polymer electrolyte membrane electrolyzer, and reactor. The system's efficiency is impacted by solar radiation intensity and inlet air conditions, with an increase in solar influx leading to decreased efficiencies. Additionally, the mass flow rate of inlet air significantly affects ammonia production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Kaiyu Li, Yitong Gao, Shengan Zhang, Guilian Liu
Summary: The hydrogen liquefaction process combined with bioethanol producing hydrogen process and multistage compressor process has been designed, simulated and analyzed, showing improved system performance and optimized energy consumption and efficiency. The study reveals a significant impact of hydrogen liquefaction ratio on system performance, with an optimal ratio of 0.89 resulting in a 12.94% reduction in energy consumption and a total exergy efficiency of 43.60%.
Article
Thermodynamics
Fatih Sorgulu, Ibrahim Dincer
Summary: In this study, a novel renewable energy-based trigeneration system integrated with a thermochemical cycle is developed and evaluated for residential applications. Solar radiation and wind kinetic energy are utilized for electricity production, while a biomass-driven thermochemical cycle for hydrogen generation is analyzed. The system provides necessary electricity and heat for residential appliances, and fresh water for a community of 10,000 houses.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Fan Jiao, Buchu Lu, Chen Chen, Qibin Liu
Summary: Thermochemical cycles are a promising method for hydrogen production but have challenges. A novel analysis method based on exergy and energy levels is proposed to explain the mechanism of triggering endothermic reactions. It is found that a certain exergy (or energy level) standard must be satisfied to trigger a thermochemical reaction.
Article
Thermodynamics
Ali M. M. Qureshy, Ibrahim Dincer
Summary: A novel photoelectrochemical cell design has been developed to enhance solar to hydrogen conversion efficiency and increase the hydrogen evolution rate. Through various analyses and simulations, the effects of different conditions on hydrogen generation rate and solar to hydrogen efficiency have been investigated.
Article
Chemistry, Physical
Faran Razi, Kasun Hewage, Rehan Sadiq
Summary: This study investigated and compared the exergoenvironmental performance of copper-chlorine, iron-chlorine, and magnesium-chlorine thermochemical hydrogen generation processes. The environmental impact rates of exergy destruction were found to be relatively higher, and the magnesium-chlorine cycle had the highest environmental impact rate of exergy destruction, while the iron-chlorine cycle had the highest component-related environmental impact rate.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Sibel Uygun Batgi, Ibrahim Dincer
Summary: This study describes a multigeneration system that utilizes a hybrid sulfur cycle and solar power towers to produce useful outputs such as hydrogen and freshwater. The overall energy and exergy efficiencies for the system are determined to be 8.15% and 3.73%, respectively. This integrated system represents a promising solution for renewable hydrogen production and freshwater generation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
H. Ishaq, I Dincer
Summary: A new configuration of solar energy-driven integrated system for ammonia synthesis and power generation is proposed in this study. The system is analyzed dynamically to explore its performance under different radiation intensities, with focus on parameters such as power production and efficiency. The findings highlight the system's capability in hydrogen and ammonia production, as well as power generation efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Mohamed M. Ismail, Ibrahim Dincer
Summary: A multigenerational waste to energy system has been developed to generate hydrogen, electricity, heating, domestic hot water, and fresh water. The system utilizes plastic waste gasification to produce syngas, which is then processed through multiple sub-systems. Energy and exergy analyses were conducted to evaluate the overall system and determine its energy and exergy efficiencies. The system also incorporates geothermal energy to generate steam for plastic waste gasification. The current system has a power capacity of 73,550 kW and produces hydrogen at a rate of 1.05 kg/s, while a reverse osmosis water desalination sub-system produces fresh water at a rate of 12 kg/s. The achieved energy efficiency and exergy efficiency for the reference case are 66.24% and 48.10%, respectively.
