Browsing by Author "Tosun, Demet Canpolat"

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Citation - WoS: 22
Citation - Scopus: 22
Dynamic performance and sustainability assessment of a PV driven Carnot battery
(Elsevier Ltd, 2023) Demet Canpolat Tosun; Emin Açıkkalp; Onder Altuntas; A. Hepbasli; Ana I. Palmero-Marrero; David Borge-Diez; Altuntas, Onder; Açıkkalp, Emin; Tosun, Demet Canpolat; Borge-Diez, David; Hepbasli, Arif; Palmero-Marrero, Ana I.; Canpolat Tosun, Demet
This study investigates the performance of a Carnot Battery and performs a thermodynamic-based sustainability analysis using different methods. Carnot batteries have two different operational processes charge and discharge. Electricity generated from a renewable source is used to operate a heat pump and the heat rejected by the heat pump is stored in the battery which is then used to generate electricity in the Organic Rankine Cycle (ORC) at night and called as the discharge process. Climatic data from the city of Izmir the third largest city by population in Turkey has been chosen for the dynamic analysis. Exergy-based sustainability and thermo-ecological cost analyses are performed. The results show that the maximum Coefficient of Performance (COP) of the heat pump system is 4.5 the exergy efficiency can reach 0.78 and its the maximum sustainability index is 4.5. For the discharge process energy efficiency of the ORC is 0.118 while the exergy efficiency is around 0.49 with a sustainability value of about 2.0. © 2023 Elsevier B.V. All rights reserved.
Citation - WoS: 15
Citation - Scopus: 16
Proposal of novel exergy-based sustainability indices and case study for a biomass gasification combine cycle integrated with liquid metal magnetohydrodynamics
(Institution of Chemical Engineers, 2023) Demet Canpolat Tosun; Emin Açıkkalp; Başar Ca̧ǧlar; Onder Altuntas; A. Hepbasli; Altuntas, Onder; Açıkkalp, Emin; Tosun, Demet Canpolat; Hepbasli, Arif; Caglar, Basar
Exergy is considered a way to sustainability. Exergy-based analyses have been recently widely used for performance assessment and comparison purposes of energy systems from production to end-user while different sustainability related indices or indicators including exergetic concepts have been developed in the literature. In this regard the present study proposed five different indices: (i) Exergetic Fuel Based Environmental Remediation Index (χ) (ii) Exergetic Product Based Environmental Remediation Index (δ) (iii) Exergetic Fuel Based Total Environmental Remediation Index (β) (iv) Exergetic Product Based Total Environmental Remediation Index (α) and (v) Improved Sustainability Index (ISI). These indices were applied to a novel Biomass-integrated Gasification Combine Cycle (BIGCC) integrated with Liquid Metal Magnetohydrodynamics (LMMHD). They allowed to perform a more complete environmental analysis by considering the exergetic cost of environmental remediation of the process. The average exergy efficiency values for the BIGCC LMMHD and the overall system were determined as 0.491 0.222 and 0.688 under daily ambient temperatures for a year and different air to fuel ratio (AFR) conditions respectively. The average values for χ β δ α and ISI were 1.636 2.389 1.949 2.848 and 0.513 respectively. © 2023 Elsevier B.V. All rights reserved.