Yazar "Şahin, Beşir" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    ENERGY AND EXERGY ANALYSIS OF A VAPOR ABSORPTION REFRIGERATION SYSTEM IN AN INTERCITY BUS APPLICATION
    (2019) Kurtulmuş, Nazım; Bilgili, Mehmet; Şahin, Beşir
    A Vapor Absorption Refrigeration (VAR) system driven by the exhaust gas waste heat received from the internal combustion engine of an intercity bus is modeled and analyzed for air conditioning the intercity bus cabin under different operating parameters. Initially, the hourly comfort cooling load of the intercity bus is calculated for a cooling season spanning five months between May and October in Turkey. After determining the capacity of heat source sufficiency for air conditioning the intercity bus, energy and exergy analyses of the VAR system are conducted, then designed and compared with the vapor compression refrigeration system in respect to the effect of fuel consumption. The results show that approximately 4,489 kg/year of fuel can be saved by using the VAR system driven by an exhaust gas waste heat in an intercity bus. The maximum coefficient of performance (COP) of the VAR system is obtained as 0.78 at 5 a.m. in May, and the maximum total exergy destruction for the VAR system is obtained as 15.25 kW at 4 p.m. in July. Lastly, the specific time is selected to investigate the effect of operating and environmental parameters on the VAR system.
  • [ X ]
    Öğe
    Performance Analysis of Solar Powered Absorption Refrigeration System for Mersin Province
    (2016) Şahin, Beşir; Bilgili, Mehmet; Çetingöz, Altan; Kurtulmuş, Nazım
    Bu çalışmada, Mersin iline ait saatlik atmosfer hava sıcaklığı ve güneş ışınım verileri kullanılarak güneş enerji destekli absorpsiyonlu soğutma (SPAR) sisteminin performans analizi yapılmıştır. Güneş enerji destekli absorpsiyonlu soğutma sisteminin tasarımında soğutucu-soğurgan çifti olarak amonyak-su (NH3-H2O) ve vakum tüplü güneş kollektörü tercih edilmiştir. İlk olarak, seçilen binanın saatlik soğutma yükü hesaplanmıştır. Sonra, bu soğutma yüküne göre sistemin termodinamik analizi yapılmış ve soğutulacak bölge için gerekli güneş kollektör alanı hesaplanmıştır. Elde edilen sonuçlara göre maksimum etkinlik katsayısı, (COP)Mayıs ayında, minimum etkinlik katsayısı, (COP) ise Temmuz ve Ağustos aylarında elde edilmiştir. Birim alana gelen maksimum güneş ışınım değeri, 23 Haziran günü saat 13.00'de 0,878 kW/m2olduğunda, COP değeri 0,434 olarak hesaplanmıştır. Sonuç olarak, 30 m2'lik soğutulacak bölge için optimum güneş kollektör alanı 50 m2 olarak hesaplanmıştır
  • [ X ]
    Öğe
    The influence of perturbation motion over a slender delta wing under sideslip angle
    (2021) Taşcı, Mehmet Oğuz; Tümse, Sergen; Şahin, Beşir; Karasu, İlyas; Akıllı, Hüseyin
    In this study, the main objective is to reveal the change of the vortical flow characteristics on a slender delta wing with a sweep angle of ?=70º under the alteration of three different sideslip angles of ?=0º, 4º, and 8º at three different main angles of attack of ?m=25º, 30º and 35º experimentally. Dye visualization experiments were conducted at a Reynolds number of Re=2x104to analyze qualitatively. The perturbation motion which has amplitudes of ?0=±0.5º and ±1º was applied continuously under the periods of time of Te=0.5s, 1s, and 2s. However, the effects of the low frequency perturbations to which the aircraft is exposed during the maneuver were examined. It is observed that Kelvin-Helmholtz in the case of the perturbed motion vortices is more prominent than static case results of the slender delta wing. The vortex breakdown location on the perturbed delta wing has been changed in a wider range than the static case of the delta wing at zero sideslip angle, ?.