Hepbaşli, Arif
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Hepbasli Arif
Job Title
Prof.Dr.
Email Address
Main Affiliation
01.01.09.04. Enerji Sistemleri Mühendisliği Bölümü
Status
Current Staff
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ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
2
Research Products
3GOOD HEALTH AND WELL-BEING
0
Research Products
4QUALITY EDUCATION
0
Research Products
5GENDER EQUALITY
0
Research Products
6CLEAN WATER AND SANITATION
12
Research Products
7AFFORDABLE AND CLEAN ENERGY
92
Research Products
8DECENT WORK AND ECONOMIC GROWTH
22
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
16
Research Products
10REDUCED INEQUALITIES
0
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
13
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
17
Research Products
13CLIMATE ACTION
17
Research Products
14LIFE BELOW WATER
1
Research Products
15LIFE ON LAND
1
Research Products
16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
17PARTNERSHIPS FOR THE GOALS
2
Research Products
Documents
401
Citations
19938
h-index
80
Documents
280
Citations
14280
Scholarly Output
169
Articles
137
Views / Downloads
3/1
Supervised MSc Theses
0
Supervised PhD Theses
0
WoS Citation Count
5590
Scopus Citation Count
6387
Patents
0
Projects
0
WoS Citations per Publication
33.08
Scopus Citations per Publication
37.79
Open Access Source
24
Supervised Theses
0
| Journal | Count |
|---|---|
| Energy Conversion and Management | 21 |
| International Journal of Exergy | 18 |
| Energy and Buildings | 16 |
| International Journal of Hydrogen Energy | 11 |
| Energy | 8 |
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169 results
Scholarly Output Search Results
Now showing 1 - 10 of 169
Article Citation - WoS: 37Citation - Scopus: 46Low exergy modelling and performance analysis of greenhouses coupled to closed earth-to-air heat exchangers (EAHEs)(ELSEVIER SCIENCE SA, 2013) Arif Hepbasli; Hepbasli, ArifThe present study deals with modelling analyzing and assessing the performance of greenhouse heating systems with earth-pipe-air heat exchangers (EAHEs) in closed loop mode. In this regard an EAHE system is considered as an illustrative example. This system starts with the power plant through the production of heat (EAHE) via a distribution system to the heating system and from there via the greenhouse air across the greenhouse envelope to the outside environment. Exergy analysis method (the so-called low exergy or LowEx approach) has been and still being successfully used to design and evaluate sustainable buildings. It is applied to all components of this EAHE system for the first time to the best of the author's knowledge in this study. The overall energy efficiency value for the EAHE system studied is determined to be 72.10% while the overall exergy efficiency value is calculated to be 19.18% at a reference state temperature of 0 degrees C. The exergy efficiency of the whole EAHE system decreases from 19.18% to 0.77% with the increase in the reference environment temperature from 0 to 18 C. The sustainability index values for the whole EAHE system decrease from 1.24 to 1.01 as the reference state temperature increases. (C) 2013 Elsevier B.V. All rights reserved.Article Citation - WoS: 78Citation - Scopus: 81Energy and exergy analyses of a hybrid hydrogen energy system: A case study for Bozcaada(Elsevier Ltd, 2017) Yildiz Kalinci; I. Dincer; A. Hepbasli; Hepbasli, Arif; Kalinci, Yildiz; Dincer, IbrahimIn the study a hybrid energy system for hydrogen and electric production is conceptually developed and applied to an island Bozcaada. A thermodynamic analysis is performed using energy and exergy approaches. The conceptual system is examined from the viewpoints of economic and energy load distributions by the Hybrid Optimization Model for Electric Renewable (HOMER) tool. In the study stand-alone island model is selected for analysis scenarios. The model consists of photo voltaic (PV) array wind turbines electrolyzer polymer electrolyte membrane fuel cell (PEMFC) hydrogen tank and converter. Energy and exergy analyses are applied to determine of the locations and magnitudes of system inefficiencies. The analyses are essentially made for the main equipment under dynamically changing operating and environmental conditions. In addition hourly distributions of changing energy and exergy rates are illustrated. As a result the daily average energy and exergy efficiencies of the PV array are 13.31% and 14.26%. Also the efficiency values are calculated for the wind turbine as 46% for energy and 50.12% for exergy and the electrolyzer equipment as 59.68% for energy and 60.26% for exergy respectively. © 2017 Elsevier B.V. All rights reserved.Article Citation - WoS: 38Citation - Scopus: 40A comparative study on conventional and advanced exergetic analyses of geothermal district heating systems based on actual operational data(Elsevier Science SA, 2013) A. Hepbasli; Ali Keçebaş; Hepbasli, Arif; Kecebas, AliThis paper comparatively evaluates exergy destructions of a geothermal district heating system (GDHS) using both conventional and advanced exergetic analysis methods to identify the potential for improvement and the interactions among the components. As a real case study the Afyon GDHS in Afyonkarahisar Turkey is considered based on actual operational data. For the first time advanced exergetic analysis is applied to the GDHSs in which the exergy destruction rate within each component is split into unavoidable/avoidable and endogenous/exogenous parts. The results indicate that the interconnections among all the components are not very strong. Thus one should focus on how to reduce the internal inefficiency (destruction) rates of the components. The highest priority for improvement in the advanced exergetic analysis is in the re-injection pump (PM-IX) while it is the heat exchanger (HEX-III) in the conventional analysis. In addition there is a substantial influence on the overall system as the total avoidable exergy destruction rate of the heat exchanger (HEX-V) has the highest value. On the overall system basis the value for the conventional exergetic efficiency is determined to be 29.29% while that for the modified exergetic efficiency is calculated to be 34.46% through improving the overall components. © 2013 Elsevier B.V. © 2013 Elsevier B.V. All rights reserved.Conference Object Citation - WoS: 40Citation - Scopus: 47Performance assessment of solar-driven integrated Mg-Cl cycle for hydrogen production(Elsevier Ltd, 2014) Mustafa Tolga Balta; I. Dincer; A. Hepbasli; Hepbasli, Arif; Balta, M. Tolga; Dincer, IbrahimThe present study develops a new solar energy system integrated with a Mg-Cl thermochemical cycle for hydrogen production and analyzes it both energetically and exergetically for efficiency assessment. The solar based integrated Mg-Cl cycle system considered here consists of five subsystems such as: (i) heliostat field subsystem (ii) central receiver subsystem (iii) steam generation subsystem (iv) conventional power cycle subsystem and (v) Mg-Cl subsystem. Also the inlet and outlet energy and exergy rates of all of subsystems are calculated and illustrated accordingly. We also undertake a parametric study to investigate how the overall system performance is affected by the reference environment temperature and operating conditions. As a result the overall energy and exergy efficiencies of the considered system are found to be 18.18% and 19.15% respectively. The results show that the Mg-Cl cycle has good potential and attractive overall cycle efficiencies over 50%. © 2021 Elsevier B.V. All rights reserved.Review Citation - WoS: 347Citation - Scopus: 419A key review of building integrated photovoltaic (BIPV) systems(Elsevier B.V., 2017) Emrah Biyik; Mustafa Araz; A. Hepbasli; Mehdi Shahrestani; Runming Yao; Li Shao; Emmanuel A. Essah; Armando Coelho Oliveira; Teodosio del Caño; Elena Rico; Shahrestani, Mehdi; Hepbasli, Arif; Biyik, Emrah; Yao, Runming; Shao, Li; Araz, Mustafa; Atli, Yusuf BaverRenewable and sustainable energy generation technologies have been in the forefront due to concerns related to environment energy independence and high fossil fuel costs. As part of the EU's 2020 targets it is aimed to reach a 20% share of renewable energy sources in final energy consumption by 2020 according to EU's renewable energy directive. Within this context national renewable energy targets were set for each EU country ranging between 10% (for Malta) and 49% (for Sweden). A large share of renewable energy research has been devoted to photovoltaic systems which harness the solar energy to generate electrical power. As an application of the PV technology building integrated photovoltaic (BIPV) systems have attracted an increasing interest in the past decade and have been shown as a feasible renewable power generation technology to help buildings partially meet their load. In addition to BIPV building integrated photovoltaic/thermal systems (BIPV/T) provide a very good potential for integration into the building to supply both electrical and thermal loads. In this study we comprehensively reviewed the BIPV and BIPVT applications in terms of energy generation amount nominal power efficiency type and performance assessment approaches. The two fundamental research areas in the BIPV and BIPVT systems are observed to be i) improvements on system efficiency by ventilation hence obtaining a higher yield with lowering the panel temperature ii) new thin film technologies that are well suited for building integration. Several approaches to achieve these objectives are reported in the literature as presented in this paper. It is expected that this comprehensive review will be beneficial to researchers and practitioners involved or interested in the design analysis simulation and performance evaluation financial development and incentives new methods and trends of BIPV systems. © 2018 Elsevier B.V. All rights reserved.Article Citation - WoS: 49Citation - Scopus: 53Advanced exergoeconomic evaluation of a heat pump food dryer(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2014) Zafer Erbay; Arif Hepbasli; Hepbasli, Arif; Erbay, ZaferIn this study the results of conventional and advanced exergoeconomic analyses of the performance of a pilot scale air-source heat pump food dryer were compared for the first time. The contributions of the components of the drying system to the exergetic cost effectiveness of the dryer were evaluated and the effects of changing the inlet drying temperature were determined. The most important system component was determined to be the heat recovery unit followed by the condenser with respect to the reducing potentials for the total costs of the overall system. Decreasing temperature caused an increase in the cost performance of drying. The modification of the system components for improving the efficiency of the system can be effectively determined through advanced exergoeconomic approach by stating the realistic potential improvements and the priorities in the system. (c) 2014 IAgrE. Published by Elsevier Ltd. All rights reserved.Article Citation - WoS: 2Citation - Scopus: 4A 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, AysegulThe 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).Article Citation - WoS: 296Citation - Scopus: 321Techno-economic analysis of a stand-alone hybrid renewable energy system with hydrogen production and storage options(PERGAMON-ELSEVIER SCIENCE LTD, 2015) Yildiz Kalinci; Arif Hepbasli; Ibrahim Dincer; Hepbasli, Arif; Kalinci, Yildiz; Dincer, IbrahimIn the present study a hybrid renewable energy system using hydrogen energy as energy storage option is conceptually modeled for the Bozcaada Island in Turkey. The system is investigated from the techno-economic point of view. The Hybrid Optimization Model for Electric Renewable (HOMER) tool is used to define the optimum size of the equipment based on the geographical and meteorological data of the island. The HOMER uses the net present cost (NPC) method while ranking the system suitability. Also the cost of energy (COE) is calculated with the total annual cost (ACT). The study considers two scenarios which are only wind turbine and wind turbine/PV hybrid systems. Using the wind turbine/PV array system instead of wind turbine only decreases the NPC from $14624343 to $11960698. Also it decreases the hydrogen tank capacity to 400 kg and hence affects other equipment size and NPC. So the COE varies between $1.016/kWh and $0.83/kWh. According to this the optimum system components are defined as PV array-300 kW wind turbine (E33x2) fuel cell-100 kW converter-150 kW electrolyzer-200 kW and hydrogen tank-400 kg to supply a 1875 kWh/d primary load. Furthermore the effects of some parameters and the equipment on NPC are examined. Increasing potential of the renewable energy sources such as annual average wind speed or solar radiation decreases both COE and NPC. While the annual average solar radiation increases to 5 kWh/m(2)/d the NPC and CUE decrease to $11673704 and $0.81/kWh. Likewise an increase in the annual average wind speed will decrease the costs to $11452712 and $0.795/kWh respectively. Also increasing the real interest i to 5% increases the COE to $1.043/kWh as expected. Copyright (c) 2014 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.Article Citation - WoS: 21Citation - Scopus: 22Performance Assessment of a Potato Crisp Frying Process(Bellwether Publishing Ltd., 2015) Seda Genc; A. Hepbasli; Hepbasli, Arif; Genc, SedaFrying is a common and popular cooking method which has been widely used in food manufacturing though it is a very energy-intensive process. Energy analysis has been commonly used to assess the performance of fryers. In this study we attempted to exergetically assess the performance of a potato crisp frying system which consists of three main components a combustor a heat exchanger and a fryer. In the analysis we utilized the actual operational data obtained from the literature. We determined exergy destruction in each system component and the whole system. We calculated universal and functional exergy efficiency values for the system components and compared them with each other. We also undertook a parametric study to investigate how the overall cycle performance was affected by changing the reference environment temperature and some operating conditions. We illustrated the exergy results through the Grassmann (exergy loss and flow) diagram. We calculated the universal exergetic efficiency values of 58 82 and 77% for the combustor heat exchanger and fryer respectively with a universal exergetic efficiency value of 4% for the whole frying system. We found that the fryer had the highest functional exergetic efficiency value of 74% followed by the heat exchanger with 47% and the combustor with 0.08%. © 2021 Elsevier B.V. All rights reserved.Article Citation - WoS: 14Citation - Scopus: 18Performance assessment of an ice rink refrigeration system through advanced exergoeconomic analysis method(Elsevier Ltd, 2017) Gulcan Özel Erol; Emin Açıkkalp; A. Hepbasli; Hepbasli, Arif; Açıkkalp, Emin; Erol, Gulcan OzelAdvanced exergy analysis has gained great importance as a comprehensive evaluation tool for energy conversion systems in recent years. In this regard splitting the exergy destruction into avoidable/unavoidable parts has enabled us to identify the improvement potential of component while endogenous/exogenous parts of the exergy destruction have been detailed studied to get more information about interactions among the components. An ice rink refrigeration system was investigated using both conventional and advanced exergoeconomic analyses in this paper. The ice rink refrigeration system has a cooling load of 300 kW and ammonia was chosen as refrigerant. Exergy destruction investment cost rates and exergy destruction cost rates based on these two analyses were calculated first. Endogenous/exogenous and avoidable/unavoidable parts of the exergy destruction investment cost rates and exergy destruction cost rate for each system component were then presented. Finally possible solutions to reducing inefficiencies were discussed. It was determined that 47.15% of the total exergy destruction of the system was avoidable while 22.89% of the total exergy destruction of the system was exogenous. The evaporator with 18% endogenous available investment cost rate and the condenser with 64.3% endogenous available exergy destruction cost rate were the two most important components in the ice rink refrigeration system. © 2017 Elsevier B.V. All rights reserved.
