Yazar "Tan, Husamettin" seçeneğine göre listele

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  • Küçük Resim
    Öğe
    Investigation of Thermal Conductivity of Ceramic Cuttin Edge Based Sialon- Si3N4
    (Gazi Univ, 2018) Dogan, Battal; Tan, Husamettin
    High speed processing of ferrous or non-ferrous metal products used cutting edge can be produced from high-tech ceramics. Used as a cutting tool in the study Sialon(KY 2000) and silicon nitride(KY3500) (Si3N4) based thermal conductivity of the two comers are determined experimentally and numerically. Studies conducted in experimental density by liquid displacement method (rho) measurement, differential scanning calorimetry (DSC) using system specific heat (c) measurement and Laser using Flash technology thermal diffusivity coefficient (alpha) measurements were performed. Experimental measurement of the effective thermal conductivity of the material (k=alpha.rho.c) is found from the expression. For numerical solution scanning electron microscope images (SEM) was used. These images using AutoCAD software finite element based software that has been made ready for Ansys. Ansys two -dimensional and effective thermal conductivity calculated at constant surface temperature boundary conditions. A new numerical method based on the thermal conductivity principle of the inserts was used in the study using SEM images and Element Analysis (EDS) results.
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    Öğe
    Novel Design and Thermodynamic Analyses of Cascade Refrigeration System at Ultra-Low Temperature
    (Int Center Applied Thermodynamics, 2022) Tan, Husamettin; Erisen, Ali
    In this study, a cascade refrigeration system comprising gas and vapor compression cycles operating at ultra-low temperature was designed. In the thermodynamic analyses, R744, R404A, and R410A refrigerants in the high temperature cycle (HTC), and R1150, R170, and R23 in the low temperature cycle ( LTC) were used. Thermodynamic analyses were carried out using the Engineering Equation Solver package program. Outputs considered were: system performance(COP), compression ratio, mass flow ratio and HTC cascade outlet temperature. Results show that, at different LTC condenser temperature values, R404A/R23 has the highest COP value, in the LTC, R23 has the highest compression ratio, while R1150 has the lowest one, in the HTC, R404A has the highest compression ratio, while R744 has the lowest one, the performance of the system increased with the decrease of the mass flow ratio.
  • Küçük Resim
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    The Numerical and Experimental Investigation of the Change of the Thermal Conductivity of Expanded Polystyrene at Different Temperatures and Densities
    (Hindawi Ltd, 2019) Dogan, Battal; Tan, Husamettin
    The determination of the thermal conductivity of insulation materials depending on which parameters in the application as well as the production is very important. In this direction, the parameters affecting thermal conductivity should be determined to improve the efficiency of the insulation materials. It is also a fact that expanded polystyrene blocks have different thermal conductivities at the same density value depending on the production process. In this study, it was determined, experimentally and numerically, that the thermal conductivity of expanded polystyrene material at different densities is dependent on which parameters and changes in temperature. Expanded polystyrene materials consist of blocks of 30x30cm with density of 16, 21, and 25kg/m(3) and a thickness of 20mm. Thermal conductivity measurements were performed in FOX 314 (Laser Comp., USA) operating in accordance with ISO 8301 and EN 12667 standards. The measurements were made for expanded polystyrene blocks at the average temperatures of 10 degrees C, 20 degrees C, 30 degrees C, and 40 degrees C. The numerical study has three stages as the acquisition of electron microscope images (SEM) of expanded polystyrene blocks, modeling of internal structure geometry with CAD program, and realization of solutions with a finite element-based ANSYS program. Findings from experimental and numerical studies and the parameters affecting thermal conductivity were determined. Finally, it is thought that numerical methods can be used to obtain a preliminary idea for EPS material in determining thermal conductivity by comparing the findings of experimental and numerical studies.