Browsing by Author "Gunerhan, H."

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Citation - WoS: 12
Citation - Scopus: 13
A comparative study on estimating the landfill gas potential: Modeling and analysis
(Taylor and Francis Inc. 325 Chestnut St Suite 800 Philadelphia PA 19106, 2016) Ali Kemal Çakir; Huseyin Gunerhan; A. Hepbasli; Hepbasli, A.; Gunerhan, H.; Cakir, A. K.
The main objective of this study is to investigate the use of the landfill gas as potential energy and electricity obtained from the municipal solid waste (domestic industrial medical waste and sewage sludge) stored regularly in the Harmandali solid waste landfill area within the boundaries of the contiguous area of Izmir. The most important factor in making a decision about energy potential in the landfill is the amount of methane in the landfill gas. There are several approaches that have been used to determine the amount of the landfill gas. In this study three different methods and one approach in the literature were used for this purpose. The methods used are the Multi-Phase the LandGEM and the IPCC 2006. The results of the landfill gas obtained using the three methods namely the Multi-Phase the LandGEM (k = 0.35 k = 0.1 and k = 0.05) and the IPCC 2006 were as follows respectively: 291897215 792073359 769734749 681685027 and 491752247 m3. It may be concluded that the Harmandali Landfill has high landfill gas potential based on the measurements and mathematical methods used in the Harmandali landfill. © 2017 Elsevier B.V. All rights reserved.
Citation - Scopus: 1
Exergetic performance analysis and comparison of various building heating options
(IEEE Computer Society help@computer.org, 2014) H. Tuzcu; Huseyin Gunerhan; A. Hepbasli; Hepbasli, A.; Gunerhan, H.; Tuzcu, H.
Heating cooling and lighting appliances in buildings account for more than one third of the world's primary energy demand. Therefore they are considered one of the main parts of the energy consumption in buildings. This study deals with energy/exergy and sustainability performance comparison of a building heating energy system from the primary energy production to the building envelope. A four story building located in Eskisehir Turkey is considered for the analysis. The indoor and outdoor air temperatures of the building are 22°C and -12°C respectively. For heating applications three options are studied namely (i) standard boiler (ii) condensing boiler and (iii) ground heat pump water-water as driven by renewable and nonrenewable energy sources. Energy and exergy analysis methods which are based on the lowex approach are performed to evaluate their performances and compare them through energy and exergy efficiencies and sustainability index. Energy and exergy flows are also studied and illustrated accordingly to have an insight into for possible improvements in the system components. Also the energetic and exergetic renewability ratios are employed here along with sustainability index. For a building with a net area of 2430.4 m2 the total exergy efficiencies of the considered heating systems are 25.3% 6.1% and 6.9% respectively for three cases. The sustainability index for three cases found as 1.196 1.236 and 1.274 respectively. © 2014 Asian Institute of Technology. © 2014 Elsevier B.V. All rights reserved.
Renewable energy effect in a building heating system
(CRC Press/Balkema Pub.NL@taylorandfrancis.com, 2015) H. Tuzcu; Huseyin Gunerhan; A. Hepbasli; Hepbasli, A.; Gunerhan, H.; Tuzcu, H.; W.-P. Sung , J.C.M. Kao
This study deals with performance of net zero energy building and comparable energy/ exergy analyses. Heating energy system is investigated from the primary energy production to the building envelope. As a building a two story detached house located in İzmir Turkey is considered for the analysis. Energy and exergy analysis methods which are based on the lowex (low exergy) method are performed to evaluate their energy performances and compare them through energy and exergy efficiencies. For heating applications three options are studied namely (i) standard boiler (ii) condensing boiler (iii) solar collector as driven by renewable and non-renewable energy sources to determine energy consumption of the detached house. For the detached house with a net area of 526.8 m2 solar collectors provide almost 31% more primary energy savings than standard boiler. The total exergy efficiencies of considered heating systems also are 3.4% 4.0% and 25.7% respectively for three cases. © 2020 Elsevier B.V. All rights reserved.
Citation - Scopus: 2
Thermoeconomic Analysis of a Mobile Air Conditioning Unit Using the Specific Exergy Cost (SPECO) Method
(IOP PUBLISHING LTD, 2020) A. Hepbasli; H. G. Ozcan; H. Gunerhan; Ozcan, H. G.; Hepbasli, A.; Gunerhan, H.
In recent years many researchers have used exergy-based analysis and assessment methods such as exergy exergoeconomic and exergoenvironmental as powerful tools to solve practical problems in the design and to improve energy-related systems. The main objectives of this contribution are to analyse and assess the performance of a mobile air conditioning (MAC) system from the thermoeconomic point of view that combines energy quality and economic issues. We used the specific exergy cost (SPECO) method to calculate exergy-related parameters and display cost flows for all streams and components in the whole system. In this context we considered a vapour compressed MAC unit (utilizing R134a as a refrigerant) of a public bus with a capacity of 99 passengers and a volume of 69 m 3 . In the analysis we utilized the real data obtained from the measurements. Based on the exergetic analysis while the highest exergy destruction rate was determined to be 3.7 kW for the compressor with a minimum value of 0.15 kW due to the condenser unit. Furthermore through the SPECO method the highest and lowest exergoeconomic factors belonged to the condenser with 0.63 and the expansion valve with 0.05 respectively.