Browsing by Author "Balta, Mustafa Tolga"

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Citation - WoS: 10
Citation - Scopus: 10
Dynamic thermo-ecological cost assessment and performance analyses of a multi generation system
(Elsevier Ltd, 2021) Canberk Ünal; Emin Açıkkalp; Mustafa Tolga Balta; A. Hepbasli; Acikkalp, Emin; Balta, Mustafa Tolga; Hepbasli, Arif; Unal, Canberk
The main objectives of this study are to perform a dynamic thermo-ecological cost (TEC) assessment and performance analyses of a multi generation system using the TRNSYS 18 software package for comparison purposes. The system has five outputs consisting of electricity clean water heating hydrogen and cooling. Multigeneration is made of an internal combustion engine fueled by natural gas a heat pump a reverse osmosis desalination plant and a magnesium-chlorine (Mg–Cl) thermochemical (TC) water splitting cycle. This cycle which appears to be a promising TC hydrogen production method is integrated to the multi generation system for producing hydrogen for waste heat recovery. Environmental effect of the system is also considered using the TEC method. In this contribution a new index namely the TEC of the irreversibility is presented and applied. Variation of emissions electricity exergy destruction and energy loss values for the considered system and Mg–Cl TC water splitting cycle as well as TECs of the electricity heat and the hydrogen are calculated through some parametric studies undertaken and presented in figures. It is determined that the multigeneration system has an energy efficiency value of 0.43 and a corresponding exergy efficiency of 0.38. As a result TECEL TECHEAT and TECH2values of the considered system are obtained to be 2.98 0.72 and 2.90 respectively. It may be concluded that the TEC is an effective method to assess the environmental performance of various energy systems and compare them with each other. © 2021 Elsevier B.V. All rights reserved.
Thermodynamic analysis of geothermally driven high-temperature steam electrolysis system for hydrogen production
(Springer International Publishing, 2014) Mustafa Tolga Balta; I. Dincer; A. Hepbasli; Hepbasli, Arif; Balta, Mustafa Tolga; Dincer, Ibrahim
Hydrogen production by high-temperature steam electrolysis (HTSE) has been receiving increasing attention worldwide due to its high efficiency and carbon-free operation. Although it is still considered in its early developmental stage it offers a promising solution for highly efficient hydrogen production. From the thermodynamic viewpoint of water decomposition it is more advantageous to electrolyse water at high temperatures because the energy is supplied in mixed form of electricity and heat. In this study a HTSE process coupled with and powered by a geothermal power plant is considered for analysis and assessment and as a case study. In this regard its thermodynamic analysis through energy and exergy is conducted for performance evaluation and comparison purposes. As a result compared to conventional water electrolysis the operation at high temperatures reduces the electrical energy requirement for the electrolysis and also increases the efficiency. © 2017 Elsevier B.V. All rights reserved.