Browsing by Author "Abusoglu, Aysegul"

Now showing 1 - 3 of 3

Citation - WoS: 2
Citation - Scopus: 4
A numerical approach to exergy-based sustainability and environmental assessments of solar energy-powered district cooling systems using actual operational data
(ELSEVIER, 2024) Huseyin Gunhan Ozcan; Arif Hepbasli; Aysegul Abusoglu; Ozcan, Huseyin Gunhan; Hepbasli, Arif; Abusoglu, Aysegul
The demand for cooling in buildings has been increasing at a higher rate than heating and more energy is expected to meet this demand. Solar energy can be vital in fulfilling this energy requirement based on its unique renewable energy features. The solar thermal powered absorption cooling (STAC) and solar electrical assisted vapor compression cooling (SEVC) systems are assessed in this study by conducting the conventional and advanced exergy analyses and environmental assessment. Determining the unavoidable part of exergy destruction as in this study provides a unique convenience in design problems where the thermodynamic performances of distinct systems are compared. Under current technological conditions removing the thermodynamically optimized parameters of the designed systems from the minima-maxima dichotomy and rationally evaluating the avoidable part of exergy destruction will protect the researcher from the arbitrariness of the design. The obtained results based on conventional exergy analysis in a component manner showed that priority should be given to solar technologies due to their lowest exergy efficiencies (0.16 for a photovoltaic (PV) and 0.19 for a collector) and sustainability indices (1.20 for the PV and 1.24 for the collector). Advanced exergy analysis results revealed that the exergy destruction significantly originated from the unavoidable part of the total exergy destruction of the components for the solar technologies (93.02 % for the collector and 96.41 % for the PV) cooling (92.12 % for the absorption and 98.42 % for the vapor compression) and overall system (99.92 % for the SEVC and 99.99 % for the STAC). The initial estimated carbon dioxide emissions from the STAC were 0.28 kg CO2-eq attributed to pump power consumption. However these emissions varied dynamically for the SEVC ranging from 0 (when the solar PV field meets the total power) to 5.58 kg CO2-eq (when radiation is not available) depending on the power-consuming components (compressor and pumps).
Citation - WoS: 7
Citation - Scopus: 7
Advanced Exergy Analysis of Waste-Based District Heating Options through Case Studies
(MDPI, 2021) Huseyin Gunhan Ozcan; Arif Hepbasli; Aysegul Abusoglu; Amjad Anvari-Moghaddam; Ozcan, Huseyin Gunhan; Anvari‐moghaddam, Amjad; Anvari-Moghaddam, Amjad; Abusoglu, Aysegul; Hepbasli, Arif
The heating of the buildings together with domestic hot water generation is responsible for half of the total generated heating energy which consumes half of the final energy demand. Meanwhile district heating systems are a powerful option to meet this demand with their significant potential and the experience accumulated over many years. The work described here deals with the conventional and advanced exergy performance assessments of the district heating system using four different waste heat sources by the exhaust gas potentials of the selected plants (municipal solid waste cogeneration thermal power wastewater treatment and cement production) with the real-time data group based on numerical investigations. The simulated results based on conventional exergy analysis revealed that the priority should be given to heat exchanger (HE)-I with exergy efficiency values from 0.39 to 0.58 followed by HE-II and the pump with those from 0.48 to 0.78 and from 0.81 to 0.82 respectively. On the other hand the simulated results based on advanced exergy analysis indicated that the exergy destruction was mostly avoidable for the pump (78.32-78.56%) and mostly unavoidable for the heat exchangers (66.61-97.13%). Meanwhile the exergy destruction was determined to be mainly originated from the component itself (endogenous) for the pump (97.50-99.45%) and heat exchangers (69.80-91.97%). When the real-time implementation was considered the functional exergy efficiency of the entire system was obtained to be linearly and inversely proportional to the pipeline length and the average ambient temperature respectively.
Citation - WoS: 12
Citation - Scopus: 15
Energy exergy economic environmental and sustainability (4ES) analyses of a wastewater source heat pump system for district heating applications based on real operational data
(Elsevier Ltd, 2023) Huseyin Gunhan Ozcan; A. Hepbasli; Aysegul Abusoglu; Amjad Anvari-Moghaddam; Ozcan, Huseyin Gunhan; Anvari-Moghaddam, Amjad; Abusoglu, Aysegul; Hepbasli, Arif
In recent years worldwide interest in utilizing the heat energy from wastewater (WW) has increased significantly concurrently with establishing policies and strategies for the sustainable management of WW. This study evaluated the 4ES performance of a photovoltaic-thermal powered WW source heat pump system for district heating applications with a series of Engineering Equation Solver (EES) simulations based on 20 different cases using actual data. The results indicated that the WW might have an energy rate potential of up to 25470 kW and an exergy rate potential of up to 2263 kW in January in a Koppen-Geiger-classified Dfb (warm-summer humid continental) climate. The highest and lowest exergy efficiency values ranged from 2.85 % to 98.24 % and from 74.80 % to 94.54 % respectively for the employed components and the entire system. The environmental and sustainability studies utilized these simulated results to derive environmental effect factor (EEF) and exergy based-sustainability index (ExSI) values in the ranges of 0.58x10-5 to 4.95x10-5 and 3.97 to 18.32 respectively. In addition the levelized cost of energy (LCOE) was modeled to be between 0.0801 ¢/kWh and 0.1341 ¢/kWh. In terms of sustainability the proposed system demonstrated superior performance than the most common heating solution on the market (i.e. natural gas-fired heating system). © 2023 Elsevier B.V. All rights reserved.