Browsing by Author "Unal, Canberk"

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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.
Citation - WoS: 15
Citation - Scopus: 18
Sustainability analysis of a solar driven hydrogen production system using exergy- extended exergy- and thermo-ecological methods: Proposing and comparing of new indices
(PERGAMON-ELSEVIER SCIENCE LTD, 2021) Sevgi Erzen; Canberk Unal; Emin Acikkalp; Arif Hepbasli; Erzen, Sevgi; Acikkalp, Emin; Hepbasli, Arif; Unal, Canberk
This paper aims at investigating and comparing some sustainability indices in the literature while proposing some new indices. A solar driven hybrid system made of a PV cell an alkaline electrolyzer and a PEM fuel cell is chosen to apply these indices because renewable-based stand-alone hybrid systems for generating electricity seem to be very promising for the future. Some sustainability indices and methods such as sustainability index exergetic sustainability index extended exergy accounting and thermo ecological cost analysis exist in the literature. In addition to these indices new indices proposed in this paper contain thermo-ecological cost (TEC) of irreversibilities extended TEC extended exergy-based sustainability index and the extended exergetic ecological index. A daily dynamic performance analysis is made for one year. According to the results exergy efficiency values range from 0.027 to 0.121 while extended exergy efficiencies vary between 0.08 and 0.14. Finally the proposed indices are classified for designing environmental cycles assessing environmental effects under operation conditions and evaluating sustainability in every aspect.