Browsing by Author "Ozcan, Huseyin Gunhan"

Now showing 1 - 11 of 11

Citation - WoS: 26
Citation - Scopus: 29
A comprehensive evaluation of PV electricity production methods and life cycle energy-cost assessment of a particular system
(ELSEVIER SCI LTD, 2019) Huseyin Gunhan Ozcan; Huseyin Gunerhan; Nurdan Yildirim; Arif Hepbasli; Ozcan, Huseyin Gunhan; Yildirim, Nurdan; Hepbasli, Arif; Gunerhan, Huseyin
This paper presents the study about electricity generation from solar photovoltaic technology based on four different methodologies with some performance indicators namely performance ratio system efficiency fill and capacity utilization factors respectively. In this regard not only theoretical approach and simulation programs (PVSOL and TRNSYS) were used to determine annual production but also experimental studies were carried out for the validation. While annual sum of electricity generation was evaluated between 3913.84 and 4323.94 kWh the PVSOL program was determined to be the method that best reflected the experimental studies with a rate of 94.33%. Moreover while fill and capacity utilization factors were annually obtained to be almost similar annual values for the performance ratio and system efficiency were evaluated to be partially close to each other based on the theoretical approach and PVSOL program. Besides evaluation of the power production and performance indicators a life cycle energy analysis was also made for a particular system with a capacity of 2.55 kWp and energy payback periods were obtained to be between 1.99 and 2.54 years considering four different methodologies. Moreover the life cycle cost analysis was performed with or without battery option and some improvement proposals were presented for the energy market to become investable. (C) 2019 Elsevier Ltd. All rights reserved.
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.
Comparative Forecasting of Energy Generation Using ARIMA and BiLSTM Models with Hyperparameter Optimization
(Springer Science and Business Media Deutschland GmbH, 2025) Ozcan, Huseyin Gunhan; Emaminia, Sara; Demirkiran, Gokhan
Citation - WoS: 31
Citation - Scopus: 33
Energy and exergy analysis of a PV-T integrated ethanol PEM electrolyzer
(Elsevier Ltd, 2021) Başar Ca̧ǧlar; Mustafa Araz; Huseyin Gunhan Ozcan; Atalay Calisan; A. Hepbasli; Ozcan, Huseyin Gunhan; Calisan, Atalay; Araz, Mustafa; Hepbasli, Arif; Caglar, Basar
A photovoltaic-thermal (PV-T) integrated ethanol proton exchange membrane electrolyzer (PEME) was proposed as a low-energy consuming energy storage option for renewable-sourced electricity as well as a way for simultaneous chemical production in this study. Energy and exergy analyses were applied to each component of the system (e.g. pumps heat exchanger PV-T PEME and separation unit (SPU)) and the whole system to assess the system performance. The mathematical modelling of the whole system along with its main components except for the SPU was done using the Engineering Equation Solver (EES) software package while the SPU was modelled through the ASPEN Plus. A detailed modelling of the PEME was also included. The effects of the PV-T and PEME parameters on energy and exergy efficiencies of the system were evaluated while the improvement potentials and scale up options were discussed. Energy and exergy efficiencies of the proposed system at the optimum operation of the PEME and under average climatic conditions in the city of Izmir Turkey were determined to be 27.8% and 3.1% respectively. Energy and exergy efficiencies of the system were mainly regulated by the PV-T and PEME whose energy and exergy efficiencies were 40.6% 56.6% and 13.8% 14.1% respectively. Effective PEME parameters for energy and exergy efficiencies of the system were membrane conductivity membrane thickness anode catalyst and the operation temperature of the PEME. By changing the PV-T and PEME parameters and by scale-up energy and exergy efficiencies of the system could be improved. © 2021 Elsevier B.V. All rights reserved.
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.
Citation - WoS: 64
Citation - Scopus: 74
Neural network-based energy management of multi-source (battery/UC/FC) powered electric vehicle
(John Wiley and Sons Ltd, 2020) Huseyin Ayhan Yavasoglu; Yusuf Engin Tetik; Huseyin Gunhan Ozcan; Ozcan, Huseyin Gunhan; Tetik, Yusuf E.; Yavasoglu, Huseyin A.
Due to increased environmental pollution and global warming concerns the use of energy storage units that can be supported by renewable energy resources in transportation becomes more of an issue and plays a vital role in terms of clean energy solutions. However utilization of multiple energy storage units together in an electric vehicle makes the powertrain system more complex and difficult to control. For this reason the present study proposes an advanced energy management strategy (EMS) for range extended battery electric vehicles (BEVs) with complex powertrain structure. Hybrid energy storage system (HESS) consists of battery ultra-capacitor (UC) fuel cell (FC) and the vehicle is propelled with two complementary propulsion machines. To increase powertrain efficiency traction power is simultaneously shared at different rates by propulsion machines. Propulsion powers are shared by HESS units according to following objectives: extending battery lifetime utilizing UC and FC effectively. Primarily to optimize the power split in HESS a convex optimization problem is formulated to meet given objectives that results 5 years prolonged battery lifetime. However convex optimization of complex systems can be arduous due to the excessive number of parameters that has to be taken into consideration and not all systems are suitable for linearization. Therefore a neural network (NN)-based machine learning (ML) algorithm is proposed to solve multi-objective energy management problem. Proposed NN model is trained with convex optimization outputs and according to the simulation results the trained NN model solves the optimization problem within 92.5% of the convex optimization one. © 2020 Elsevier B.V. All rights reserved.
Citation - WoS: 26
Citation - Scopus: 28
Numerical and experimental work to assess dynamic advanced exergy performance of an on-grid solar photovoltaic-air source heat pump-battery system
(Elsevier Ltd, 2021) Huseyin Gunhan Ozcan; Szabolcs G. Varga; Huseyin Gunerhan; A. Hepbasli; Ozcan, Huseyin Gunhan; Varga, Szabolcs; Hepbasli, Arif; Gunerhan, Huseyin
In the near future renewable energy powered air conditioning systems will play an important role in the building sector. In this study a solar photovoltaic powered air source heat pump with a battery system was modeled and numerically simulated using Transient System Simulation Tool. The experimental studies were also carried out to validate the developed model. The novelty concerns to integrate conventional and advanced exergy analyses into the numerical model to annually determine the exergy destructions with main sources (exogenous endogenous unavoidable avoidable and their combination) at a component level. The results obtained from the experiments showed that on-site weather conditions air temperature difference occurring between inlet and outlet of the evaporator unit and the power flow between the main system components were considerably modeled well. Based on the simulated studies conventional exergy analysis revealed that the highest annual exergy destruction amount was due to the photovoltaic panels with 23.3 MWh while the lowest one occurred in the batteries with 156.1 kWh. This also indicated that the highest potential for improvement lays within the photovoltaic panels. According to the simulated results considering the advanced exergy analysis the yearly exergy destruction amount in the photovoltaic panels and in the heat pump (920.6 kWh) were fully endogenous corresponding to unavoidable values of 21.3 MWh and 455.3 kWh respectively. On the other hand all the main sources of exergy destruction were seen for both inverter and batteries where the contribution of the unavoidable endogenous (429.9 kWh) and unavoidable exogenous (66.2 kWh) parts were annually found to be significant for the inverter and the batteries respectively. © 2020 Elsevier B.V. All rights reserved.
Citation - WoS: 14
Citation - Scopus: 16
Numerical simulation and parametric study of various operational factors affecting a PV-battery-air conditioner system under prevailing European weather conditions
(Elsevier Ltd, 2021) Huseyin Gunhan Ozcan; Szabolcs G. Varga; Huseyin Gunerhan; A. Hepbasli; Ozcan, Huseyin Gunhan; Varga, Szabolcs; Hepbasli, Arif; Gunerhan, Huseyin
The building sector currently accounts for approximately 40 % of final energy consumption. In the near future renewable energy driven heat pump systems will play an important role in the thermal management of buildings. The work described here deals with the effect of weather conditions as well as operational characteristics on the energy and economic performances of a solar PV powered air conditioning unit (ACU) with a battery system (PBAS) based on numerical and experimental investigations. The experiments were carried out to test the developed TRNSYS model. In the assessment various performance indicators were used while a novel performance indicator the so-called annual grid independence ratio was also proposed. The simulated studies revealed that annual energy performance indicators (self-consumption self-sufficiency grid independence and energy conversion ratios) are greatly affected by climatic conditions and operational characteristics. Besides the economic analysis has shown that the net present value and the energy consumption profiles or diverging values for state of charges are directly proportional for the hottest (Seville) climate. However they are inversely proportional for the coldest (Stockholm) climate for the considered PBAS configuration (PV-2.5 kWp ACU-2.52 kW cooling and 2.84 kW heating batteries-9.6 kW h) under the selected economic status of the sites. © 2022 Elsevier B.V. All rights reserved.
Citation - WoS: 6
Citation - Scopus: 6
Performance evaluation of a mobile air conditioning unit: An exergetic approach
(Inderscience Publishers, 2019) Huseyin Gunhan Ozcan; A. Hepbasli; Huseyin Gunerhan; Ozcan, Huseyin Gunhan; Hepbasli, Arif; Gunerhan, Huseyin
This study considers a public bus (having a capacity of 99 passengers and a volume of 69 m3) along with its vapour compressed mobile air conditioning (MAC) unit (utilising R134a as a refrigerant) together as a low exergy (so-called LowEx) system. The LowEx analysis which has been mostly applied to buildings and conventional exergy analyses method are utilised together (coupled up analysis method) to assess the performance of this system for the first time to the best of the authors’ knowledge. Based on the LowEx analysis total exergy efficiency and exergy flexibility factor are calculated to be 11.92% and 0.56 for the heating mode and 3.41% and 0.19 for the cooling mode respectively. Furthermore through on the conventional exergy analyses the highest exergy efficiency belongs to condenser with 93.08% in the cooling mode while it is 93.20% for the water heat exchanger in the heating mode respectively. © 2020 Elsevier B.V. All rights reserved.
Citation - WoS: 3
Citation - Scopus: 4
Thermodynamic analysis and assessment of a geothermal cooling system for a house
(INDERSCIENCE ENTERPRISES LTD, 2019) Buket Ozcan; Ilkyaz Ekin Aykurt; Melisa Akpak; Tuna Tacer; Nurdan Yildirim; Arif Hepbasli; Huseyin Gunhan Ozcan; Ozcan, Huseyin Gunhan; Tacer, Tuna; Akpak, Melisa; Yildirim, Nurdan; Hepbasli, Arif; Aykurt, Ilkyaz Ekin; Ozcan, Buket
In this study a geothermal assisted cooling system with a vapour absorption chiller (VAC) was designed in order to meet the cooling demand of a 140 m(2) detached single-family house in Izmir Turkey. In the considered system the geothermal fluid is transported to the VAC where water and ammonia are used as an absorbent and a refrigerant respectively. Energy and exergy analyses methods are utilised to assess the performance of the whole system while some operational properties of the VAC such as pressure temperature ammonia concentration and flow rate are determined. Based on the parametric studies optimum operating conditions of the VAC are obtained to be 30 degrees C 90 degrees C and 2 degrees C for the condenser boiler and evaporator respectively. Under these conditions the system has a coefficient of performance (COP) value of 0.30 with a simple payback period of 6.4 years the highest exergy destruction occurs within the absorber with a rate of 38.2%.