Browsing by Author "Caliskan, Hakan"

Now showing 1 - 9 of 9

Citation - Scopus: 9
Assessment of Maisotsenko combustion turbine cycle with compressor inlet cooler
(Springer International Publishing, 2015) Hakan Caliskan; I. Dincer; A. Hepbasli; Hepbasli, Arif; Dincer, Ibrahim; Caliskan, Hakan
In this study a Maisotsenko combustion turbine cycle (MCTC) with compressor inlet cooling system is proposed and studied through energy exergy and exergoeconomic analysis methods. The present system consists of a Maisotsenko air cooler a compressor a turbine a generator a combustor and a compressed air saturator. The results show that an exergy efficiency of 58.27 % is higher than the corresponding energy efficiency of 51.55 % for the MCTC system due to the fact that the exergy content of the fuel fed into the combustion chamber is lower than its energy content. Also the maximum exergy destruction rates occur in the compressor and turbine with the values of 166.964 kW and 150.864 kW respectively. Furthermore the exergoeconomic results indicate that the highest exergetic cost factor defined as the destruction in the component per cost is determined to be 0.013148 kW/$ for the turbine while the Maisotsenko cycle air cooler has a minimum rate of 0.000006 kW/$. The better optimization of this component may be considered. It is concluded that Maisotsenko cycle systems can be effectively integrated to turbine cycle systems. Also energy exergy and exergoeconomic analyses give more useful information together about assessing the MCTC system and minimizing the thermodynamic inefficiencies. © 2017 Elsevier B.V. All rights reserved.
Citation - WoS: 111
Citation - Scopus: 129
Energy exergy and sustainability analyses of hybrid renewable energy based hydrogen and electricity production and storage systems: Modeling and case study
(Elsevier Ltd, 2013) Hakan Caliskan; I. Dincer; A. Hepbasli; Hepbasli, Arif; Dincer, Ibrahim; Caliskan, Hakan
In this study hybrid renewable energy based hydrogen and electricity production and storage systems are conceptually modeled and analyzed in detail through energy exergy and sustainability approaches. Several subsystems namely hybrid geothermal energy-wind turbine-solar photovoltaic (PV) panel inverter electrolyzer hydrogen storage system Proton Exchange Membrane Fuel Cell (PEMFC) battery and loading system are considered. Also a case study based on hybrid wind-solar renewable energy system is conducted and its results are presented. In addition the dead state temperatures are considered as 0 °C 10 °C 20 °C and 30 °C while the environment temperature is 30 °C. The maximum efficiencies of the wind turbine solar PV panel electrolyzer PEMFC are calculated as 26.15% 9.06% 53.55% and 33.06% through energy analysis and 71.70% 9.74% 53.60% and 33.02% through exergy analysis respectively. Also the overall exergy efficiency ranging from 5.838% to 5.865% is directly proportional to the dead state temperature and becomes higher than the corresponding energy efficiency of 3.44% for the entire system. © 2017 Elsevier B.V. All rights reserved.
Citation - Scopus: 5
Environmental impact assessment of building energy systems
(Springer New York, 2013) Mustafa Tolga Balta; I. Dincer; A. Hepbasli; Balta, M. Tolga; Dincer, Ibrahim; Hepbasli, Arif; Caliskan, Hakan
This chapter deals with energy/exergy and environmental analyses of a low exergy heating system. A building with a volume of about 392 m3and a floor area of 140 m2is presented as a case study. For this building four different heating options are investigated namely (1) electric boiler (2) ground heat pump system (3) standard boiler and (4) solar collector. In this regard an energy and exergy analysis is employed to assess their performances and compare them through energy and exergy efficiencies. Also CO2 NOx SO2emissions of the considered systems are determined and compared with each other. Overall exergy efficiencies of the heating systems are found to be 4.0 10.1 7.6 and 35.7 %. CO2 NOx SO2emissions rate per year (kg emission/year) calculated for considered cases as 10726.32 4224.17 3737.56 and 337.67 11.14 4.39 3.40 and 3.35 and 116.34 45.82 3.68 and 3.66 respectively. The lowest environmental impact is provided by case 4. © 2017 Elsevier B.V. All rights reserved.
Citation - WoS: 67
Citation - Scopus: 75
Exergoeconomic and environmental impact analyses of a renewable energy based hydrogen production system
(Pergamon-Elsevier Science Ltd, 2013) Hakan Caliskan; I. Dincer; A. Hepbasli; Hepbasli, Arif; Dincer, Ibrahim; Caliskan, Hakan
In this study exergoeconomic and environmental impact analyses through energy exergy and sustainability assessment methods are performed to investigate a hybrid version renewable energy (including wind and solar) based hydrogen and electricity production system. The dead state temperatures considered here are 10 °C 20 °C and 30 °C to undertake a parametric study. An electrolyzer and a metal hydride tank are used for hydrogen production and hydrogen storage respectively. Also the Proton Exchange Membrane Fuel Cell (PEMFC) and battery options are utilized for electricity generation and storage respectively. As a result the energy and exergy efficiencies and the sustainability index for the wind turbine are found to be higher than the ones for solar photovoltaic (PV) system. Also the overall exergy efficiency of the system is found to be higher than the corresponding overall energy efficiency. Furthermore for this system it can be concluded that wind turbine with 60 gCO2/month is more environmentally-benign than the solar PV system with 75 gCO2/month. Finally the total exergoeconomic parameter is found to be 0.26 W/$ when the energy loss is considered while it is 0.41 W/$ when the total of exergy loss and destruction rates are taken into account. Copyright © 2013 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. © 2013 Elsevier B.V. All rights reserved.
Citation - WoS: 138
Citation - Scopus: 156
Exergoeconomic- enviroeconomic and sustainability analyses of a novel air cooler
(ELSEVIER SCIENCE SA, 2012) Hakan Caliskan; Ibrahim Dincer; Arif Hepbasli; Hepbasli, Arif; Dincer, Ibrahim; Caliskan, Hakan
This study presents the energy exergy environmental exergoeconomic enviroeconomic and sustainability analyses of the Maisotsenko cycle based novel air cooler considering the nine different dead state temperatures while the environment temperature is kept constant. In the energy analysis the wet bulb and dew point effectivenesses cooling capacity energetic coefficient of performance and primary energy ratio rates are calculated. Also in the exergy analysis exergy input output loss and destruction rates as well as exergetic coefficient of performance and primary exergy ratio and exergy efficiency values are determined. Furthermore sustainability analysis of the system is conducted through a sustainability index method. The electrical energy consumption cost of this novel air cooler shows that it consumes only 59.85 $/year when it is operated 8 h a day and 125 days in a year. The maximum exergetic cost rate is found to be 0.0228 kWh/$-year at a dead state temperature of 37.77 degrees C. Also according to the enviroeconomic (environmental cost) analysis this novel air cooler has very CO2 emissions cost as 6.96 $/year. Consequently these results show the originality of the Maisotsenko cycle based novel air cooler. (C) 2012 Elsevier B.V. All rights reserved.
Letter to Editor: Rebuttal to "some comments to the paper 'Energy exergy and sustainability analyses of hybrid renewable energy based hydrogen and electricity production and storage systems: Modeling and case study'"
(Elsevier Ltd, 2013) Hakan Caliskan; I. Dincer; A. Hepbasli; Hepbasli, Arif; Dincer, Ibrahim; Caliskan, Hakan
[No abstract available]
Citation - WoS: 23
Citation - Scopus: 24
Novel combined extended-advanced exergy analysis methodology as a new tool to assess thermodynamic systems
(PERGAMON-ELSEVIER SCIENCE LTD, 2021) Emin Acikkalp; Hakan Caliskan; Onder Altuntas; Arif Hepbasli; Altuntas, Onder; Acikkalp, Emin; Hepbasli, Arif; Caliskan, Hakan
In this study a novel combined extended-advanced exergy analysis method is developed for assessing thermodynamic systems. The method is established by combining extended exergy analysis with advanced exergy analysis and the so-called extended-advanced exergy analysis. The methodology used in the novel analysis method is different from only extended exergy analysis and only advanced exergy analysis but the criteria are the same to reach the goal. This proposed method is applied to a gas turbine system as a case study to show its variability. The gas turbine system considered consists of a combustion chamber a compressor and turbine units. The conventional (Fuel-Product approach) advanced and extended exergy analyses are separately applied to the case study system for the comparison with the novel combined extended-advanced exergy analysis. It is seen that the combined extended-advanced exergy analysis results of the case study are not exactly the same with the advanced and extended exergy analyses? results. The reason for this is its comprehensive joint of various thermodynamic analysis methodologies integrating all materials capital labor energy and environmental effect instead of the relation between components and their improvement potentials in one analysis. But it is assessed that the novel analysis tool is able to apply all of those analyses into one simple methodology. The exergy efficiencies of the case study are 28% and 31% by considering the conventional and extended exergy analyses respectively. This means that all input parameters including labor capital and environment are used with better efficiency. Also the exogenous exergy destruction rate (159 kW) is higher for the combined extended-advanced exergy analysis (384 kW). This shows that the relations between other components are increased for the turbine. Another important change is shown in avoidable exogenous exergy destruction rate for the turbine increasing from 374 kW to 833 kW. This new combined method is useful to those who wish to apply advanced and extended exergy analyses through a new practical assessment way.
Citation - WoS: 75
Citation - Scopus: 81
Thermodynamic analyses and assessments of various thermal energy storage systems for buildings
(Pergamon-Elsevier Science Ltd, 2012) Hakan Caliskan; I. Dincer; A. Hepbasli; Hepbasli, Arif; Dincer, Ibrahim; Caliskan, Hakan
In this study energetic exergetic environmental and sustainability analyses and their assessments are carried out for latent thermochemical and sensible thermal energy storage (TES) systems for phase change material (PCM) supported building applications under varying environment (surrounding) temperatures. The present system consists of a floor heating system System-I System-II and System-III. The floor heating system stays at the building floor supported with a floor heating unit and pump. The System-I includes a latent TES system and a fan. The latent TES system is comprised of a PCM supported building envelope in which from outside to inside, glass transparent insulation material PCM air channel and insulation material are placed respectively. Furthermore System-II mainly has a solar-thermochemical TES while there are an aquifer TES and a heat pump in System-III. Among the TESs the hot and cold wells of the aquifer TES have maximum exergetic efficiency values of 88.782% and 69.607% at 8°C dead state temperature respectively. According to the energy efficiency aspects of TESs the discharging processes of the latent TES and the hot well of the aquifer TES possess the minimum and maximum values of 5.782% and 94.118% at 8°C dead state temperature respectively. Also the fan used with the latent TES is the most environmentally-benign system component among the devices. Furthermore the most sustainable TES is found for the aquifer TES while the worst sustainable system is the latent TES. © 2012 Elsevier Ltd. All rights reserved. © 2012 Elsevier B.V. All rights reserved.
Citation - WoS: 25
Citation - Scopus: 27
Thermoeconomic analysis of a building energy system integrated with energy storage options
(Pergamon-Elsevier Science Ltd, 2013) Hakan Caliskan; I. Dincer; A. Hepbasli; Hepbasli, Arif; Dincer, Ibrahim; Caliskan, Hakan
This study deals with exergetic and thermoeconomic analyses of thermal energy storage (TES) systems such as latent sensible and thermochemical options coupled with different units for building heating applications under varying reference (dead-state) temperatures of 8 C 9 C and 10 C respectively. It is found that the variation reference temperature affects the thermoeconomic parameters. The exergetic cost of the system becomes higher at the higher reference conditions as directly proportional to the varying dead state conditions. It also becomes minimum at 8 C reference temperature as 196.96 $/h while it is maximum at 10 C dead-state temperature with 357.60 $/h. Furthermore the maximum capital cost of the equipment is determined for the thermochemical TES as 4.612 $/h. So the better optimization of this equipment may be considered. © 2013 Elsevier Ltd. All rights reserved. © 2013 Elsevier B.V. All rights reserved.