Browsing by Author "Açikkalp, Emin"

Now showing 1 - 8 of 8

Citation - WoS: 67
Citation - Scopus: 70
Advanced exergoeconomic analysis of a trigeneration system using a diesel-gas engine
(PERGAMON-ELSEVIER SCIENCE LTD, 2014) Emin Acikkalp; Haydar Aras; Arif Hepbasli; Aras, Haydar; Hepbasli, Arif; Açikkalp, Emin
In this paper a trigeneration system was analyzed using an advanced exergy analysis. The trigeneration system is located in the Eskisehir Industry Estate Zone in Turkey. The exergy efficiency of the system is 0.354 and the total exergy destruction of the system is 16.695 MW. The total exergoeconomic factor of the system is 0.069 and unit electricity generating cost is 56.249 $/GJ. The exergy destruction and investment cost rates within the facility's components are generally divided into four parts: endogenous exogenous avoidable and unavoidable exergy destruction. Through this analysis the improvement potential of the costs of the components and the investment and the overall system were determined along with the economic relationships between the components. The results of the analysis indicate that the combustion chamber high pressure steam turbine and condenser exhibit significant economic improvement potential because of their high exergy destruction costs. Similarly the heat recovery steam generator and condenser exhibit significant potential to reduce their investment costs. In addition suggestions for improving system economical parameters are provided. (C) 2014 Elsevier Ltd. All rights reserved.
Citation - WoS: 62
Citation - Scopus: 66
Advanced exergoeconomic analysis of an electricity-generating facility that operates with natural gas
(Pergamon-Elsevier Science Ltd, 2014) Emin Açıkkalp; Haydar Aras; A. Hepbasli; Aras, Haydar; Hepbasli, Arif; Açikkalp, Emin
This paper presents an advanced exergy analysis of an electricity generation facility in the Eskisehir Industry Estate Zone in Turkey. The total electricity generation rate is approximately 55 MW. The exergy efficiency of the system is 0.402 and the total exergy destruction rate of the system is 78.242 MW. The unit exergy cost of electrical power that is generated by the system is 25.660 $/GJ and the total exergoeconomic factor of the system is 0.247. Advanced exergetic and exergoeconomic analyses were applied to the considered system. The advanced exergoeconomic analysis shows that the combustion chamber the high-pressure steam turbine and the condenser have great economic improvement potential because of their high exergy destruction cost rates. Similarly the heat recovery steam generator and the condenser have significant potential because of their investment costs. In addition suggestions to improve the system economical parameters are provided. Finally it can be concluded that relations between the components are strong. © 2013 Elsevier Ltd. All rights reserved. © 2013 Elsevier B.V. All rights reserved.
Citation - WoS: 19
Citation - Scopus: 24
Advanced exergoenvironmental assessment of a building from the primary energy transformation to the environment
(ELSEVIER SCIENCE SA, 2015) Emin Acikkalp; Arif Hepbasli; Cem Tahsin Yucer; T. Hikmet Karakoc; Açikkalp, Emin; Yucer, Cem Tahsin; Karakoc, T. Hikmet; Hepbasli, Arif
Buildings are of great importance in terms of consumption of energy all over the world. Building sector has a significant influence over the total natural resource consumption and is significant contributors of greenhouse gases. Exergy-based methods in assessing the performance of buildings have become very popular in recent years. In this context conventional exergoenvironmental methods include exergy and life cycle analysis and are considered to be very reliable to evaluate environmental impacts of any system. Advanced exergoenvironmental analysis is a combination of advanced exergy analysis and life cycle assessment. This study deals with determining the environmental effects of a building heating system at various stages. Advanced exergoenvironmental method is applied to the system from the primary energy transformation to the environment. Using advanced exergoenvironmental analysis relations between the components and the stages (endogenous exogenous parts) the improvement potentials (avoidable and unavoidable parts) and the advanced exergoenvironmental rates for the system stages are determined. A parametric study is undertaken to investigate effects of the environment temperature on exergy destruction rates and the environment temperature on efficiencies. Based on the environmental temperature a sensitivity analysis is also performed for exergy destruction rates and efficiencies. Results show that the exogenous environmental impact of the system is 68.6% while the avoidable exergoenvironmental impact is only 7%. (C) 2014 Elsevier B.V. All rights reserved.
Citation - WoS: 38
Citation - Scopus: 40
Advanced exergoenvironmental assessment of a natural gas-fired electricity generating facility
(PERGAMON-ELSEVIER SCIENCE LTD, 2014) Emin Acikkalp; Haydar Aras; Arif Hepbasli; Aras, Haydar; Hepbasli, Arif; Açikkalp, Emin
This paper presents conventional and advanced exergoenvironmental analyses of an electricity generation facility located in the Eskisehir Industry Estate Zone Turkey. This facility consists of gas turbine and steam cycles which generate electrical power of approximately 37 MW and 18 MW respectively. Exergy efficiency of the system is 0.402 and exergy destruction rate of the system is 78.242 MW. Unit exergy cost of electrical power generated by the system is 25.66 $/GJ and total exergoeconomic factor of the system is 0.279. Conventional exergy analysis method was applied to the system first. Next exergy environmental impacts of exergy destruction rate within the facility's components were divided into four parts generally as endogenous exogenous avoidable and unavoidable environmental impact of exergy destruction rate. Through this analysis improvement potential of the environmental impacts of the components and the overall system and the environmental relations between the components were then determined. Finally exergoenvironmental factor was determined as 0.277 and environmental impact of the electricity was 8.472 (Pts/h). The system has 33% development potential for environmental impacts while its components have weak relations because of big endogenous parts of environmental impacts (80%). It may be concluded that advanced exergoenvironmental analysis indicated that priority should be given to the GT and CC while defining the improvement strategies. (C) 2014 Elsevier Ltd. All rights reserved.
Citation - WoS: 38
Citation - Scopus: 41
Advanced exergy analysis of a trigeneration system with a diesel-gas engine operating in a refrigerator plant building
(Elsevier Ltd, 2014) Emin Açıkkalp; Haydar Aras; A. Hepbasli; Aras, Haydar; Hepbasli, Arif; Açikkalp, Emin
In this paper a trigeneration system is analyzed using an advanced exergy analysis. The trigeneration system is located in the Eskisehir Industry Estate Zone in Turkey. The exergy efficiency of the system was found to be 0.354 while the total exergy destruction rate of the system was 16.695 MW. The purpose of this study is to determine the improvement potential of the system. The exergy destruction within the components of the facility is divided into four parts: endogenous exogenous avoidable and unavoidable exergy destruction. The components of the trigeneration system have strong relationships with each other since the endogenous exergy destruction of the components is smaller than the exogenous exergy destruction. The avoidable exergy destruction rates are generally greater than the unavoidable ones. Thus the trigeneration system possesses a high potential for improvement. This analysis indicates that from a thermodynamic perspective the turbo air compressor is the most important component in the system. Through the advanced exergy analysis information about the relationships among the system components as well as the potential for further improvements may be provided in more detail. © 2014 Elsevier B.V. © 2014 Elsevier B.V. All rights reserved.
Citation - WoS: 14
Citation - Scopus: 16
Advanced low exergoeconomic (ALEXERGO) assessment of a building along with its heating system at various stages
(ELSEVIER SCIENCE SA, 2015) Emin Acikkalp; Cem Tahsin Yucer; Arif Hepbasli; T. Hikmet Karakoc; Açikkalp, Emin; Yucer, Cem Tahsin; Karakoc, T. Hikmet; Hepbasli, Arif
The present study deals with evaluating the performance of a building heating system along with its main components using advanced low exergoeconomic analysis method. This method combines advanced exergoeconomic with low exergy (LowEx) and is shortly called ALEXERGO. A building heating system is investigated from the energy production to the building envelope stage by stage through the ALEXERGO for the first time by the authors. Based on the results the generation and distribution stages are found to have bigger exogenous exergy destruction cost rates meaning that the components in these stages have strong interconnections. The emission (heating) stage has however a bigger endogenous exergy destruction cost rate. The generation and emission stages have low improvement potentials while the distribution stage has a big improvement potential. A sensitivity analysis is also made based on the environmental temperature for exergy destruction rates and efficiencies. (C) 2014 Elsevier B.V. All rights reserved.
Citation - WoS: 5
Citation - Scopus: 6
Application of net zero extended exergy buildings concept for sustainable buildings analysis
(ELSEVIER, 2023) Emin Acikkalp; Arif Hepbasli; Ana I. Palmero-Marrero; David Borge-Diez; Açikkalp, Emin; Borge-Diez, David; Hepbasli, Arif; Palmero-Marrero, Ana I.
Different Zero-Energy Building (ZEB)-related definitions considering its four main dimensions such as zero energy zero carbon zero exergy and zero cost have been proposed by different investigators. Among these exergy-based definitions are relatively low in numbers. In this regard the main objective of this present study is to propose net zero extended exergy buildings as a new concept which combines extended exergy and net zero exergy building concepts and is a measure of the exergetic footprint. This concept setups a balance between extended exergy accounting of electricity from the grid and electricity generated in building. The proposed methodology is applied to a building available in the literature for heating and cooling seasons. Results show that 450Wp peak power and 44.181 kWh electrical energy must be obtained for meeting the electricity demand of the building. Another novel result is that the extended exergy accounting of the electricity generated by PV panels is bigger than the extended exergy of the electricity taken from the gird meaning that exergetic footprint of the electricity generated by PV panels is bigger. However this result must be interpreted for the whole life time of the system.
Citation - Scopus: 3
Off-grid hybrid systems based on combined conventional and unconventional technologies: Design analyses and illustrative examples
(Elsevier, 2021) Sevgi Erzen; Emin Açıkkalp; A. Hepbasli; Hepbasli, Arif; Erzen, Sevgi; Açikkalp, Emin
In this section off-grid hybrid systems based on combined conventional and unconventional technologies are examined. Some non-conventional and relatively novel systems are considered. Some simple illustrative examples are provided to better evaluate the hybrid systems while their performance evaluations have been made. Considering the results obtained it can be concluded that these systems are quite promising on the basis of waste heat utilization and very promising for electricity generation from low-temperature heat sources. © 2022 Elsevier B.V. All rights reserved.