Sürdürülebilir Kalkınma Amaçları

• 2

Alt birimler

• Raylı Sistemler Elektrik ve Elektronik Teknolojisi Pr.
• Raylı Sistemler Yol Teknolojisi Pr.

Araştırmacılar(4)

• Bulut, Nüsret
• Dalgakıran, Mehmet
• Firat, Ilker
• Köse, Nurten

• ArticleAçık Erişim2025/r/ebyu/19352
  Effects of rectangular-shaped turbulators on heat transfer, friction factors, and entropy

  Fırat, İlker

  In this study, the effects of turbulators with different P ratios placed in a circular cross-section test pipe under turbulent flow conditions using water as the working fluid on heat transfer, friction factor (f), and entropy production were investigated using Ansys-Fluent 2021. The lowest Nu was calculated as 111 at Re=11825 for P=6, while the highest Nu was calculated as 219 at Re=19133 for P=1. The increase in Nu values for P = 6, 3, 2, 1.5, 1.2, and 1 compared to the plain pipe is 10.34%-11.64%; 17.39%-18.78%; 25.31%-26.56%; 34.42%-35.88%; 43.53%-44.87%; and 50.36%-51.47%, respectively. In turbulent situations, the highest entropy production rate was found to be 0.3631 W/mK at Re=11825 for P=6, while the lowest entropy production rate was found to be 0.2215 W/mK at Re=19133 for P=1. The minimum and maximum Ns reduction compared to the empty pipe was calculated as 7.13% for Re=19133 at P=6 and 46.62% for Re=11825 at P=1, respectively. In turbulent conditions, the highest Bejan number was found to be 0.9931 at Re=11825 for P=6. As a result, it was concluded that a ratio of P=1 provides maximum benefit in terms of heat transfer, while a ratio of P=6 is ideal in terms of total entropy production.

  • 
  İncele
• ArticleAçık Erişim2018/r/ebyu/22526
  The Investigation of Heating Conduction Coefficients of Different Heating Isolation Materials Used in buildings in Circumstance of Erzincan Province Using Thermocouple and Thermal Camera

  Kaya, Mehmet; Ulusu, İsmet; Kotan, Temel; Fırat, İlker

  Given the fact that 35 % of total energy is consumed in buildings and % 80 of that energy is used as heating purposes, it is of importance that heating isolation material applied to buildings as well as more efficient heating systems set up in buildings provides large energy savings. Providing desired performance in heating isolation is directly correlated to properties of heating isolation material along with to thoroughly complying to application techniques of isolation materials. Expanded perlit is considered to be alternative heating isolation material because it has close isolation values to that of other isolation materials, and its lifetime approaches to infinity due to its puzolanik features gaining strength with time, and it prevents heat bridges as isolation process is done as whole in layer, and it has high fire durability, sound isolation, and it prevents the formation of vapor between wall and plaster surface and so that prevents mold and bacteria with the help of breathing the air, and it doesn`t emit harmful chemical substance due to fact that it is natural. In this study, an experimental room was made in Erzincan province and compared the thermal insulation performance of perlite, which is the most widely used thermal insulation material today, with expanded EPS. As a result of the evaluation of the received measurement data, it has been determined that 8 cm expanded perlite and 6 cm EPS thermal insulation material have equal thermal insulation capacity.

  • 
  İncele