Browsing by Author "Yucer, Cem Tahsin"

Now showing 1 - 6 of 6

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: 15
Citation - Scopus: 18
Advanced life cycle integrated exergoeconomic analysis of building heating systems: An application and proposing new indices
(Elsevier Ltd, 2018) Emin Açıkkalp; A. Hepbasli; Cem Tahsin Yucer; Hikmet Tahir Karakoc; Açıkkalp, Emin; Yucer, Cem Tahsin; Karakoc, T. Hikmet; Hepbasli, Arif
Advanced exergy-based analysis and assessment tools have been considered very useful tools for detecting the interactions among components of energy-conversion systems and the real potential for improving each component in any system. In this study a building heating system is analyzed using advanced life cycle integrated (LCI)exergoeconomic analysis method which combines cost and environmental impacts. Some new indices (metrics) such as advanced exergy destruction ratio advanced LCIexergoeconomic ratio advanced LCIexergoeconomic sustainability index and advanced indices are presented. These metrics are also applied to the main components of the system. The boiler has the maximum LCI endogenous exergy destruction cost ratio while the maximum LCI exogenous destruction ratio is due to the water heater. The advanced LCIexergoeconomic depletion ratios are 0.187 0.599 0.414 and 0.371 for the endogenous exogenous unavoidable and avoidable parts respectively. © 2018 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: 9
Citation - Scopus: 9
Exergoeconomic analyses of an energy supply chain for space heating in a building
(ELSEVIER SCIENCE SA, 2013) Cem Tahsin Yucer; Arif Hepbasli; Hepbasli, Arif; Yucer, Cem Tahsin
This study evaluates both exergetically and exergoeconomically a building along with its heating system which is examined from the generation stage to the envelope of the building. The energy and exergy flows between all the stages are determined using a predesign tool which has been recently used to optimize various building designs. The findings based on applying the proposed new term the lowexergoeco (a combination of the low exergy and exergoeconomics) analysis method is utilized to investigate the system performance. A steam boiler a heat exchanger and a radiator in a room are considered to analyze the heating system. The ratio of thermodynamic loss rate over cost ((R) over dot(ex)) is calculated to be 4.52 W/US$ for the generation stage while it is 19.77 W/US$ for the steam boiler. A new indicator exergetic cost effectiveness defined as the multiplication of the components' contribution to the total cost and contribution to the total exergy destruction in the system is also proposed. This parameter gives designer or researcher the possibility to decide which components of the system to be improved. First two high values are found to be 0.278 and 0.063 for the generation and the building envelope respectively. (C) 2013 Elsevier B.V. All rights reserved.
Citation - WoS: 27
Citation - Scopus: 31
Exergoeconomic and enviroeconomic analyses of a building heating system using SPECO and Lowex methods
(Elsevier Science SA, 2014) Cem Tahsin Yucer; A. Hepbasli; Hepbasli, Arif; Yucer, Cem Tahsin
This study deals with exergetic and exergoeconomic analyses of a building heating system which is examined from the generation component to the envelope of the building. The energy and exergy flows between the components are calculated using the predesign tool for an optimized building design. To the best of the authors' knowledge the specific exergy costing (SPECO) method is applied to a building along with a low-exergy (also referred to as Lowex) analysis for the first time. By adding the value from the generation to the emission components the exergetic cost coefficients of the products are determined to be 174.67 $/GJ and 256.89 $/GJ respectively. Exergetic cost effectiveness (ECE) parameter is used to decide about which components will be improved. The first two high values are found to be 0.469 and 0.0057 for the generation and the building envelope respectively. © 2014 Elsevier B.V. © 2014 Elsevier B.V. All rights reserved.
Citation - WoS: 2
Citation - Scopus: 2
IMPROVING THE PERFORMANCE OF A HEATING SYSTEM THROUGH ENERGY MANAGEMENT BY USING EXERGY PARAMETERS
(Serbian Society of Heat Transfer Engineers, 2020) Cem Tahsin Yucer; A. Hepbasli; Hepbasli, Arif; Yucer, Cem Tahsin
Energy management systems are used to analyze the efficiency of energy systems and identify any problem areas to lower costs and save energy typically using energy based performance measurements. Our aim was to use exergy parameters instead to see if more accurate information could be obtained about which energy saving application would result in greater energy savings. Exergy analysis is based on the Second law of thermodynamics and focuses on the environment and the quality of the energy. Implementing an exergetic approach to analyze a steam heating system we examined data related to exergy flows and exergy losses and ultimately improved the performance of the system through this energy management model. The following seven energy saving applications were identified and ranked according to their improvement potentials: adjusting the air to fuel ratio – 1 preventing steam leaks – 2 installing an automatic blow down system – 3 insulating the pipes – 4 insulating valves and flanges –5 insulating fuel tank –6 and recovering heat loss from the waste condensate –7. The optimum ranking obtained through the exergy analysis was 3-1-2-5-7-6-4. A reduction of 15.918 kW in exergy consumption was achieved by installing an automatic blowdown system. This meant a total reduction of 1779.03 kg per year in total fuel consumption $1458.81 per year of cost reduction and the total cost reduction achieved was $1829.25 per year. Making improvements to the seven selected areas in the system 38.4% of the energy loss was recovered while the recovery in the exergy consumption was 44.5%. © 2022 Elsevier B.V. All rights reserved.