Browsing by Author "Bozgeyik, Ahmet"

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Citation - WoS: 38
Citation - Scopus: 52
A parametric study of a renewable energy based multigeneration system using PEM for hydrogen production with and without once-through MSF desalination
(PERGAMON-ELSEVIER SCIENCE LTD, 2022) Ahmet Bozgeyik; Lutfiye Altay; Arif Hepbasli; Hepbasli, Arif; Bozgeyik, Ahmet; Altay, Lutfiye
The importance of renewable energy compared to fossil fuels is increasing due to growing energy demand and environmental challenges. Multi-generation systems use one or more energy sources and produce several useful outputs. The present study aims at investigating and comparing solar energy based multi-generation systems with and without once -through MSF desalination unit from the thermodynamic point of view. Firstly hydrogen electricity and hot water for space heating and domestic usage are produced using the system which consists of a parabolic trough collector an organic Rankine cycle (ORC) and a PEM electrolyzer and heat exchanger as sub-systems. The performance of the entire system is evaluated from the energetic and exergetic points of view. Various parameters affecting hydrogen production rate and efficiency values are also investigated with the thermodynamic model implemented in the Engineering Equation Solver (EES) package. The system can produce hydrogen at a mass flow rate of 20.39 kg/day. The results of the study show that the energy and exergy efficiency values of the ORC are calculated to be 16.80% and 40% while those for the overall system are determined to be 78% and 25.50% respectively. Secondly once-through MSF desalination unit is integrated to the system between ORC evaporator and heat exchanger producing domestic hot water in the solar cycle in order not to affect hydrogen production rate while thermodynamic values are compared. Fresh water production capacity of the system is calculated to be at a volumetric flow rate of 5.74 m(3)/day with 10 stages. (C) 2022 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
Citation - WoS: 64
Citation - Scopus: 68
Energetic- exergetic- exergoeconomic- environmental and sustainability analyses of a solar- geothermal and biomass based novel multi-generation system for production of power- hydrogen- heating- cooling and fresh water
(ELSEVIER, 2023) Ahmet Bozgeyik; Lutfiye Altay; Arif Hepbasli; Hepbasli, Arif; Bozgeyik, Ahmet; Altay, Lutfiye
The present study proposes and investigates a novel solar geothermal and biomass based multi-generation system producing multiple outputs to generate power hydrogen heating cooling and fresh water. Parabolic trough solar collectors a two stages Rankine cycle two organic Rankine cycles two absorption cooling systems a gas turbine system a once-through (OT) multi stage flash (MSF) desalination unit a geothermal unit a heat pump an electrolyser and a thermal energy storage are used as sub-systems. The novelty of the system is to focus on novel sub-system design pattern for the proposed multi-generation system by using multiple energy inputs as there is a gap about those studies in the literature. The overall system performance is evaluated from energetic exergetic exergo-economic environmental (4E) and sustainability points of view by using the EES software package. The total installed power and hydrogen mass flow rates are 7.76 MW and 3.52 kg/h respectively. The energy and exergy efficiency values of the overall system are found to be 65.55% and 27.09%. Fresh water flow rate is calculated to be 6.16 kg/s with 10 stages. The overall unit product cost is determined to be 2179 $/GJ and the overall social ecologic factor is calculated to be 1.37.