Browsing by Subject "Specifications"

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    A key review on performance improvement aspects of geothermal district heating systems and applications
    (2007) Ozgener L.; Hepbasli A.; Dincer I.
    This paper deals with a comprehensive analysis and discussion of geothermal district heating systems and applications. In this regard, case studies are presented to study the thermodynamic aspects in terms of energy and exergy and performance improvement opportunities of three geothermal district heating systems, namely (i) Balcova geothermal district heating system (BGDHS), (ii) Salihli geothermal district heating system (SGDHS), and (iii) Gonen geothermal district heating system (GGDHS) installed in Turkey. Energy and exergy modeling of geothermal district heating systems for system analysis and performance evaluation are given, while their performances are evaluated using energy and exergy analysis method. Energy and exergy specifications are presented in tables. In the analysis, the actual system operational data are utilized. In comparison of the local three district heating systems with each other, it is found that the SGDHS has highest energy efficiency, while the GGDHS has highest exergy efficiency. © 2006 Elsevier Ltd. All rights reserved.
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    Study on lubricant quality and its effect on engine component performance
    (2008) Beşergil B.; Sabih Özer M.; Eskici M.; Atik E.
    Purpose- This paper aims to determine the usage time of the test lubricant N0, prepared from base oils of Aliaga Plant, Izmir, in gasoline and diesel-engines, and the investigations of high-temperature oxidation, engine-protective properties, and property changes of the lubricant in performance time.Design/methodology/approach- Physical and chemical properties of the lubricating oil were initially established, and the oil was then subjected to Petter W-1 gasoline and Petter AV-1 diesel test engines. Dismantling of the engine parts was followed by the examination of pistons, piston rings and bearings, and analysis of the lubricant was also undertaken. The engine performance test results and the quality control of the lubricating oil assessments were evaluated according to the International Engine Lubricant Specifications.Findings- The lubricating oil, under sluggish experimental conditions, appears to meet a 40-hour test in gasoline engines and a 120-hour test in diesel engines with the specifications. This means that under usual working conditions the lubricants keep the engine protective properties in 7,000 km distance for gasoline run-vehicles, and in 5,000 km distance for diesel run-vehicles, after which change of the oil is required.Originality/value- The paper provides information of value to those involved with lubrication and engine performance. © 2008, Emerald Group Publishing Limited
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    Comparison of Turkish Steel Building Specifications, TS 648 and SDCCSS 2018
    (Techno-Press, 2022) Bozkurt M.B.; Ergüt A.; Özkılıç Y.O.
    This study presents similarities and differences between Turkish Building Code for Steel Structures, which are TS 648 and SDCCSS (Specification for Design, Calculation and Construction of Steel Structures) in terms of the design of the members. Hot-rolled I-shaped steel sections for symmetrical and U-shaped steel sections (i.e., channels) for monosymmetric sections were elaborated in detail. The design strength of tension members under tensile load, compression members under axial load and flexural members under flexure and shear were examined separately. Connection details for tension members, slenderness for compression members and distance between lateral supports for flexural members were considered as prime variables. Analysis results revealed the design strength of the tension members where at least one of the cross-sectional parts is not connected to the connection plates, I-shaped compression members where a slenderness ratio is below 39 (λ<39), U-shaped compression members and flexural members where Lb is between Lp and Lr (Lp