Document 5kVVdXXZOzbzJzXXx6KwEV7NN

812 CHAPTER 41 1949 Guide Table 2. Circular Equivalents of Rectanqulab Ducts fob Equal Fbiction and Capacitt (Continued) Dimensions in Inches SlDB RboTAW- 8 7 S' 0 10 u 12 18 14 15 16 17 18 19 Duct . 6 6.6 ,7 7.1 7.7 8,: 7.5 812 's:a 9' 8.0 8.6 9:3 9.9 :, 10 8.4 9.1 9.8 10.4 10.9 11 8.8 9.5 10.2 10.8 11.4 12.0 .12 9.1 9.9 10.7 11.3 11.9 12.6 13.1 13 9.5 10.3 11.1 11.8 12.4 13.0 13:6 14:2 14 9.8 10.7 11.5 12.2 12.9 13.5 14.2 14.7 15.3 15 10.1 11:0 11:8 12.6 13.3 14.0 14.6 15.3 16.8 16.4 16 10.4 11'.4' 12.2 13.0 13.7 14.4 15.1 16.7 16.3 16.9 17:5 . 17 10.7 11.7 12.5 13.4 14.1 14.9 15.5 16.1 16.8 17.4 18.0 18.6 . 18 19 20 . 22- 11.0 11.9 12.9 13.7 14.5 15.3 16.0 16.6 17.3 17.9 18:5 19.1 19.7 11.2 12.2 13.2 14.1 14.9 15.6 16.4 17.1 17.8 18.4 19.0 19.6 20.2 20.8 11.5 12.5 13.5 14.4 15.2 15.9 16.8 17.5 18.2 18.8 19.5 20.1 20.7 21.3 12.0 13:1 14:1 15.0 15.9 16.7 17.6 18.3 19.1. 19.7 20.4 21.0 21.7 22.3 U 24 ' 26 28: . 30 12.4 13.6 14.6 15.6 16l 6 17.5 18:3' 19 :i 19.8 20.6 21.3 21.9 22.6 23.2 12.8 14.1 15.2 16.2 17.2 18.1 19.0 19.8 20.6 21.4 22.1 22:8 23.5 24.1 13.2 14.5 15.8 16.7 17.7 18:7. 19.6 20.5: 21.3 22.1 22.9 23.6 24.4 25.0 13.6 14.9. 16.1 17.2 18.3 19:3 20.2 21.1 22.0 22.9 23.7. 24.4 25.2 25.9 32 14.0'. 15.3; 16.5 17:7 18.8' 19.8 20.81 21.8" 22.7 23.6 24.4 25.2 26.0 26.7 34 ' 14:4 15.7 17.'0 18:2 19.3 20.4 21:4 22:4 23.3 24.2: 25.1 25.9 28.7 27.5 36 . 14.7 16.1 17.4 18.6 19.8 20.9 21.9 23.0 23.9 24.8 25.8 26.6 27.4 28.3 38 15.0 16.4 17.8 19.0 20.3 21.4 22.5 23.5 24.5 25.4 26.4 27.3 28.1 29.0 '40- 15.3 16:8 18.2 19.4 20.7-' 21.9 23;.0 24.0' 25:1 26.0 27.0 27.9 28:8 29.7 42 15.6 17.1 18.5 19.8 21.1 22.3 23.4 24.5 25.6 26.6 27.6 28.5 29.4 30.4 44 15.9 17.5 18.9 20.2 21.5 22.7 23.9 25.0 26.1 27.2 28.2 29.1 30.0 31.0 . 46 16.2 17:8 19:2 20:6 21.9 23.2 24.3 25:6 26.7 27.7 28.7 29.7 30.6 31.6 "48 16.5 18.1 19.6 20.9 22.3 23.6 24.8 26.0 27.2 28.2 29.2 30.2 31:2 32.2 50 16.8 18.4 19.9 21.3 22.7 24.0 25.2 26.4 27.6 28.7 29.8 30.8 31.8 32.8 52 17.0 18.7 20.2 21.6 23.1 24.4 25.6 26.8 28.1 29.2 30.3 31.4 32.4 83.4 54 17.3 19.0 20.5. 22.0 23.4 24.8 26.1 27.3 28.5 29.7 30.8 31.9 32.9 33.9 56 17.6 19.3 20.9 22.4 23.8 25.2 26.5 27.7 28.9 30.1 31.2 32.4 33.4 34.5 ;:58 17.8 19.5 21.1 22.7 24.2 25.5 26.9 28.2 29.3 30.5 31.7 32.9 33.9 35.0 .60 18.1 19.8 21.4 23.0 24.5 25.8 27.3 28.7 29.8 31.0 32.2 33.4 34.5 35.5 62 18.3 20.1 21.7 23.3 24.8 26.2 27.6 29.0 30.2 31.4 32.6 33.8 35.0 36.0 64 18.6 20.3 22.0 23.6 25.2 26.5 27.9 29.3 30.6 31.8 33.1 34.2 35.5 36.5 66 18.8 20.6 22.3 23.9 25.5 26.9 28.3 29.7 31.0 32.2 33.5 34.7 35.9 37.0 68 19.0 20.8 22.5 23.2 25.8 27.3 28.7 30.1 31.4 32.6 33.9 36.1 36.3 37.5 70 19.2 21. 22.8 23.5 26.1 27.6 29.1 30.4 \ 31.8 33.1 34.3 35.6 36.8 37.9 DYNAMIC (SHOCK) LOSSES Any sudden change in the direction or magnitude of the velocity of the air flow causes a greater loss in pressure than would occur in steady flow through a straight duct of uniform cross-section and the same length. Although all shock losses may be considered as caused by changes in the Jr Duct Design 813 5 .]! 8S3S8 SSSS SSSS .SSSS SSSS SSSS SSSS SSSS SSSS 838 s " a Hi 3 SSSS 38S s &s issi sis s asSs I5ss sis s 8 ", S S SS SS33 S3S5 S&S -*<-, cq- 00 SSSS SS83 3333 SSB IS sill IIII liasIII i-r-r-r- e~r-.t-.e- coo oor-co . ssss ssss ssss tsss sas si II5I Ills Ills IHk III SSSS SSSS SSSS.sIsI IIII III saisffisisis - II Ills IIIS 3ISI 552i~ 22S5 III s'as ssss ssgg ss'ss sss's s'lss sll sssa ssss sss's sss's sssi Ills III S StSS SSSS SSSS SSSS 3838 SSSS sll S"' S3 ssss ssss ssss ssss sl'is Sill IIS 3 .333 m m ns: as ss ss s: SSSS SSSS SSSS SSSS SSSS 5253 5535 III B SSSS SSSS SSSS SSSS SSSS-SSSS Itell III a ss alls SSSS SSSS SSSS SSSS sill sill III - an m m as as m ai%a ; IIII. 5552 3553 3353 ;;II 3325 3353 5255 555 -s an na n::ns mm m a ::n ass asanas sin naan sa-as ; M :. i :mm aaaa an m sin mm.ss s m m see m see m m aa an as i SSSS SSSS SSSS SSSS SSSS.SSSS SSSS SSSS SSSS 338 1