KL MA SANTRALLER N TASARLANAN B R DEL KL D F Z RL BO H CREDEK HAVA AKI ININ SAYISAL OLARAK NCELENMES ahmet.erdogan@inonu.edu.tr, ekrem.tacgun@inonu.edu.tr, suat.canbazoglu@inonu.edu.tr, gokhan.aksoy@inonu.edu.tr, kerimsonmez@hotmail.com, hemreshn@gmail.com zet: Klima fandan sonra gelen lerin kesit. Klima geometriye sahip bir delik her birinin seviyesi olan farkl koniklik ) olan etkisi Anahtar K elimler: Taguchi A NUMERICAL INVESTIGATION OF AIR FLOW IN AN EMPTY CHAMBER WITH PERFORATED DIFFUSER DESIGNED FOR AIR HANDLING UNITS Abstract: Crosssectional area of air existing of fans used in air handling units is smaller than crosssectional area of chambers which are located next to the fan such as heating/cooling coils, silencer (muffler), filter or heat recovery elements. To make the air handling unit work efficiently, it is required that the air is blown through fan diffuses with as low as possible pressure loss and homogen velocity distribution. Empty chambers with perforated diffuser is used to diffuse from small crosssectional area to large cross sectional area. In this study, an empty chamber with perforated diffuser whose geometry is square based truncated pyramid is used. In this case, it is numerically investigated that both diffusion of air to the next unit and pressure loss caused by empty chamber with perforated diffuser. Using Taguchi Method, it is determined that the effect of different four parameters with three levels (porosity, velocity inlet, thickness and draft angle) on the pressure loss. K eywords: Air handling unit, Computational fluid dynamic (CFD), Fan, Perforated diffuser, Taguchi method. 815 m/s mertebelerinde ve [1]. Bu sebeple, fandan sonra arada rimlerini 1.5 k
L bir p, [3, 4]. Bayramgil ve ark. [5] L 13]. 2. M ATERYAL ve M ETOD koniklik ) beli in ve seviyelerinin olan etkileri ( Taguchi 2.1. Delikli S.
600 mm 1200 mm 1200 mm x 1200 mm 612 mm 600 mm x 600 mm, d 100 mm x 100 mm (L o ) 100 mm L) 300 mm. d=30 mm Delikli ; Hava Giri i d Hava k L o L 612 mm koniklik olarak parametre deliklerin kesitindeki ortalama hava mektedir. ( ) ise Belirlenen parametreler ve seviyeleri Tablo Tablo 1. Parametreler ve seviyeleri Birim Seviye1 Seviye2 Seviye3 Porozite 0.40 0.50 0.60 Giri H z (V) m/s 8 9 10 Et Kal nl (t) mm 2 3 4 Koniklik A s ( ) o 50 55 60 se k modeli
3 edilmesinden S/N) analizi yapmaya gerek kalmam Belirlenen seviye P Tablotir. yonu tespit edilir [15]. Taguchi ; tekrar deneysel
Tablo 2. Taguchi ortogonal dizilim s PARAM ETRE SAYISI (P) 2 3 4 5 6 7 8 9 10 2 L4 L4 L8 L8 L8 L8 L12 L12 L12 3 L9 L9 L9 L18 L18 L18 L18 L27 L27 4 L16 L16 L16 L16 L32 L32 L32 L32 L32 5 L25 L25 L25 L25 L25 L50 L50 L50 L50 3 te; seviyeleriyle birlikte 1 koniklik Tablo o ). Tablo 3. L9 Ortogonal dizilimi P1 (Porozite) P2 (Giri H z ) P3 (Et kal nl ) P4 (K oniklik A s ) Test 1 1 1 1 1 Test 2 1 2 2 2 Test 3 1 3 3 3 Test 4 2 1 2 3 Test 5 2 2 3 1 Test 6 2 3 1 2 Test 7 3 1 3 2 Test 8 3 2 1 3 Test 9 3 3 2 1 Belirlenen parametrelerin ve bu parametrelerin seviyelerinin normalde 3 4 = 81 adet test yapmak gerekmektedir. ANSYS program ANSYS 4 12 4. Test1 analizinde teki taki
5. Test2 6. Test3 7. Test4
8. Test5 9. Test6 10. Test7
1. Test8 2. Test9 Tablo 4. leri P1 P2 P3 P4 (Porozite) (K oniklik (Pascal) Test 1 1 1 1 1 18.66 Test 2 1 2 2 2 39.07 Test 3 1 3 3 3 78.26 Test 4 2 1 2 3 10.10 Test 5 2 2 3 1 21.09 Test 6 2 3 1 2 29.66 Test 7 3 1 3 2 10.35 Test 8 3 2 1 3 13.99 Test 9 3 3 2 1 15.90 Tablo ve optimum
Tablo 5. Parametr Parametreler Etki Uygun Seviye Porozite 1 3 2 1 3 1 4 1, 8.46 Pa o kullanarak Taguchi kte alt n
m Bu ) 6. K AYNAK LAR [1] HVAC Systems Duct Design, Fourth Edition, Chapter 6, SMACNA, (2006). [2] [3] Bulut, S., nveren, M., Ar soy, A, B ke, Y. E., CFD Analiz Y ntemiyle Klima Santrallerinde Kay plar n Azalt lmas, T.M.M.O.B., X. Ulusal Tesisat M hendisli i Kongresi ve Sergisi, zmir, (2011), Sayfa: 291326. [4] Tanyol,.,Klima Santrallerinde Enerji Tasarrufu ve CFD Analizi le Diren lerin Azalt lmas, I. Ulusal klimlendirme So utma E itimi Sempozyumu, a r l Konu ma, Bal kesir, (2012). [5] Bayramgil, V., Bayrak S., Y kselen M.A., Erim M. Z., Experimental investigation of a diffuser for cooling and air conditioning system, International Council of the Aeronautical Sciences and The American Institute of Aeronautics and Astronautics, (1998). [6] ahin, B. Pressure losses in an isolated perforated plate and jets emerging from the perforated plate, International Journal of Mechanical Science, 31, pp. 5161, (1989). [7] ahin, B., WardSmith A.J., Lane D., The pressure drop and flow characterist