scholarly journals Multi-Criteria Optimization of a Biomass-Based Hydrogen Production System Integrated With Organic Rankine Cycle

2020 ◽  
Vol 8 ◽  
Author(s):  
Xiaoqi Zhang ◽  
Yuling Zhou ◽  
Xiaotong Jia ◽  
Yuheng Feng ◽  
Qi Dang
Keyword(s):  
Hydrogen Production ◽  
Production System ◽  
Organic Rankine Cycle ◽  
Rankine Cycle

Thermodynamic analysis of a wall mounted gas boiler with an organic Rankine cycle and hydrogen production unit

2017 ◽  
Vol 28 (7) ◽  
pp. 725-743 ◽  
Author(s):  
Anahita Moharamian ◽  
Saeed Soltani ◽  
Faramarz Ranjbar ◽  
Mortaza Yari ◽  
Marc A Rosen
Keyword(s):  
Hydrogen Production ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Inlet Pressure ◽  
Pinch Point ◽  
Working Fluids ◽  
Turbine Inlet ◽  
Energy And Exergy ◽  
Cogeneration System ◽  
Net Power Output

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.

scholarly journals Thermodynamic performance analysis and optimization of a power and hydrogen generation system based on geothermal flash, dual-pressure organic Rankine cycle using zeotropic mixtures, and PEM electrolyzer

2020 ◽  
Author(s):  
Seyed Saman Ashraf Talesh
Keyword(s):  
Hydrogen Production ◽  
Proton Exchange Membrane ◽  
Hydrogen Generation ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Proton Exchange ◽  
Geothermal System ◽  
Base Case ◽  
Geothermal Heat ◽  
Exchange Membrane

Abstract In this study, a thermodynamic model and optimization of a flash-binary geothermal system are proposed for power and hydrogen production. The binary cycles contain a dual-pressure ORC cycle and proton exchange membrane electrolyzer for power and hydrogen production. The combination of dual-pressure organic Rankine cycle with zeotropic mixtures enhances the performance of the system considerably, and selection of the best kind of zeotropic mixture as the working fluids of the DORC unit is one of the important methods to improve the performance of the suggested system. Also, the Genetic algorithm is employed to optimize the net output power of the system, in which the results of optimization show that the best performance belongs to Pentane (0.467)/Butane (0.533) with first and second-law efficiencies of 16.66%, 58.03%, respectively, and hydrogen production of 0.3683 kg/hr. Besides, for the base case simulation, the energy and exergy efficiencies of the whole system are reported by about 16.66% and 58.03%, respectively, also for this condition, the derived power from the proposed model and overall exergy destruction is calculated approximately 132.41 kW, and 90.08 kW, respectively and geothermal heat source generates 0.306 kg/hr hydrogen by the proton exchange membrane electrolyzer.

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