通风工程-课件.ppt

1、)工業通風系統種類圖示圖%100SseCCCC5.0)/(4005dVPV 5.0)/(043.4dVPV 英制(inH2O);(ft/min)公制(mmH2O);(m/sec)2.).(0052.0DGSVs26.).)(104.26(DGSVs(mps)(fpm)rVQN60rVQN3600歧管角度歧管角度歧管內速度壓損歧管內速度壓損失係數失係數K100.06150.09200.12250.15300.18350.21400.25450.28500.32600.44901.00HeVPSPhHeVPSPh外裝式氣罩的抽氣風速越高，補集效率越佳VcVgVgVc捕捉點飛散限界點發散源開口面溝槽

2、型百葉型長方形型格條型圓形長方形向上吸引型外裝式氣罩向下吸引型外裝式氣罩側向吸引型外裝式氣罩覆蓋式套箱式氣櫃型建築岡亭型氣罩設置分為：吹出氣罩吹出氣流將污染有害物吸入氣罩：而吸入氣罩將吹出氣流及污染有害物吸入氣罩內。hePSPhvhePSPhv)()(理想實際QQCe SPhPCevVPCeCehe221hoodKCe11VhoodPheKconstantgZdP2v2constantgZP2v2cc22c22c11c21gggZP2gV ggZP2gV Hgwq21,V,2S,2V,1S,1PPPPtPPPs2V P2v2V PPPP2vstvf2ffPDfL2VDfLPv2vfe2fedP

3、C2VC PDLf2VDLfPeLC2VDLLf 2VCDfL PPP2fe2fdftfVDRefDrfDD4/D442周長風管截面積baabbaabP2244A4Df濕截面之周長風管截面積v2vfe2fedPC2VC PDLf2VDLfP2/PPC2ddVPv2C2CP2o2idoiVV2C2CP2o2idoiVV2oiCCioVVccsbsb2CP2CP2b-cb-c2s-cs-cccVVv2vfe2fedPC2VC PDLf2VDLfP2VDfP2fdtotalL4/18/5HW1.3WHDoutainaQQ,風扇12345ab421QQQ532QQQsubpathtatPP,風扇123

4、45ab4,5,2,3,2,tttttatPPPPPP5,3,ttbtPPP靜壓與全壓之測量靜壓全壓利用皮氐管將三種管壓力均以U型管水柱高表示送風機壓力之變化過程 導 管排氣道 ttCtCN21lnlnCVGNCVtGN建築物造成的排氣進氣交互影響建築物造成的排氣進氣交互影響好尚可Air supplyAir supplyAir exhaustAir exhaustAir exhaustAB*Short-circuiting of air.Air should be exhausted to the outside(or through high-efficiency particulate a

5、irHEPA filters,if recirculated).Room airflow patterns designed to provide mixing of air and prevent passage of air directly from the air supply to the exhaust*BuildingExhaust stackAir recirculation zoneWindflowRe-entrained airDoorP1P2Pressure indicator*1.1 Qin 50 cfm for TB onlyAirflow pressure at P

6、osition 1 may differ from Position 2.Measure pressure at Position 2 to correctly identify negative pressureOpening beneath doorSmoke tubeSmokeDoorAnemometerHEPA unit1/3 LContaminated airClean(filtered)airDoor end of the room10%Exhaust to outside for negative pressure if room has no ventilationHEPA filter and blowerTHANK YOU-