- Research in Agricultural Sciences
- Vol: 21 Issue: 1
- RÜZGAR HIZI VE YÖNÜ İLE HAVA ÇIKIŞ AÇIKLIĞI TİPİNİN HAVALANDIRMAYA OLAN ETKİStNÎN KAPALI SIĞIR BARIN...
RÜZGAR HIZI VE YÖNÜ İLE HAVA ÇIKIŞ AÇIKLIĞI TİPİNİN HAVALANDIRMAYA OLAN ETKİStNÎN KAPALI SIĞIR BARINAĞI MODELİNDE İNCELENMESİ ÜZERİNE BİR ARAŞTIRMA
Authors : A. Vahap Yağanoğlu
Pages : 0-0
View : 9 | Download : 4
Publication Date : 2011-01-02
Article Type : Research
Abstract :ÖZET Bu araştırma, 30 başlık kapalı ve duraklı süt sığırı ahırının 1/20 ölçekli modeli üzerinde yapılmıştır. Rüzgar hızı ve yönü ile farklı 4 tipte planlanan mahya hava çıkış açıklıklarının model içi hava dağılımına ve havalandırma miktarına olan etkisi araştırılmıştır. Araştırma laboratuvar koşullarında yapılmış olup rüzgar tünelinden sağlanan değişik yönlerden esen farklı rüzgar hızları ile mahya hava akım hızlan ve model içi ve dışı arasındaki sıcaklık farklarıyla olan ilişkileri belirlenmiştir. Araştırmadan elde edilen sonuçlara göre, mahya açıklığının şekli, rüzgar yönü ve yapının konumu mahya hava akım hızını önemli ölçüde etkilemektedir. Dikdörtgen orifıs şeklinde planlanan mahya açıklık tipi, diğer tiplere oranla daha uygun havalandırma sağlamaktadır. RIDGE VENT, WIND DIREKTION AND WIND VELOCITY EFFECTS ON CLOSED, NATURALLY VENTTLATED, CATTLE BUILDlNG VENTILATION SUMMARY Naturally ventilated buildings used for cattle production hava various ridge vent configurations. Information pertaining to the ventilation characteristics ofdifferent geometrically shaped ridge vent is limited. Therefore, the effects ofwind speed, wind direction and ridge vent shape were studied in a model (1/20 scale) on ventilation characteristics, naturally ventilated, dairy cattle building. A simple wind tunnel was built to develop an airflow pattern. Wind was simulated by variable speedfans. Wind speed varied between 0 to 7 mJs. The construction of the model was based on a geometric lenght scale of 20, and the assumption was t hat the samefluid and material would be used in the model and prototype, Trusses, purlins, poles, sides and roof were made of wood. The end walls were constructed with plexiglass for the purpose ofvisual observation of airflow patterns. The four ridge vents were constructed by using galvanized metal. Principles of similitude and dimensional analysis were utilized in deriving a set of independent and dependent Pi terms, From the defination of the Buckingham Pi Theorem a set of14 dimensionless Pi terms were obtained (Langhaar, 1983). The sdudy descr 'ıbed in this paper was conducted to determine which type of ridge vent would be suitable for naturally ventilated dairy barns in cold regions. Resuîts indicated that ridge vent design has a signifıcant effect on outled velocity and wind velocity. Temperature difference was affected by ridge vent geometry and vind velocity. The baffled (Type II) ridge vent had the highest outlet velocity when ali wind directions were considered, while covered (Type III) ridge vend produced the lowest outlet velodties. AUhough the covered ridge vent produced the largest temperature differences, the associated low outlet velodties make it the least desirable of the four ridge vents tested.Keywords :