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ID:43136415
大小:156.88 KB
页数:13页
时间:2019-09-27
《低流量排烟柜设计及测试之研讨》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、LowFlowFumeHoodsDesignandTestingConcerns低流量排煙櫃設計及測試之研討Thelowflowfumehoodsarethebuzzintheindustry.Theconceptisattractivebecausethemessageissimple:低流量排煙櫃現在工業界已造成某種反應,這種觀念之所以吸引人,道理很簡單:1.Constantvolumehoodsthatuse40-60%lessairthanconventionalhoods;為定風量排煙櫃,比傳統排煙櫃風量需求少40・60%。2.N
2、ocomplicatedVAVcontrols;沒有很複雜之變風量控制。3.Safetybecausetheycan“pass"ASHRAE110testingwithanANSItracergasconcentrationcriterion.安全:因為可以引用ANSI偵測氣體濃度之條款,通過ASHRAE110測試。Thepurposeofthisbulletinisto:本文之目的為:•ReviewtheapplicableCodes,Standards,andGuidelines,noneofwhichsupportstheuseofv
3、erylowfacevelocities(e.g.<60ft/min)檢視各現行法令、標準及指南,均無支持使用此種極低表面風速(如<60ft/min)之有利證明。•ReviewsomeoftheessentialaspectsoftheASHRAE110-1995FumeHoodMethodofTestingPerformanceofLaboratoryFumeHoods.檢視某些ASHRAE110-1995實驗室排煙櫃性能測試法之基本觀點。•Dispelsomeofthemythsurroundingtheso-calledANSIrec
4、ommendedtracergasconcentrationlevelforfumehoods.消除一些所謂ANSI主張之排煙櫃偵測煙霧濃度之盲點。Addperspectivewhyasingletestmethodisinsufficienttojudgethesafetyperformaneeofafumehood.增加為何甲一的測試方法'不足以評鑑排煙櫃之安全性能的•Providereferencematerialthatsupportstheuseofhigherfacevelocitytoensurecontainmentwhen
5、theoperatorsarepresent,andthehoodsareinusewiththesashfullyopen.提供參考資料以證明當使用時調節門於全開位置時,使用較高表面風速可確保捕捉率。LowFlowFumeHoods-DesignandTestingConcerns低流量排煙櫃設計及測試相關事宜Thereisconsiderableinterestinreducingthelaboratoryfumehoodexhaustflows,inanefforttoreducethefirstcostandannualoperat
6、ingcosts.Lowflowfumehoodsarenotnew;infact,somefacilitieshavebeenapplyinglowflowhoodsformanyyears.Morerecently,somehooddesignershaveredesignedtheaerodynamicfeaturesoftheirhoodsorhaverestrictedthesashopeningssothatthefumehoodsrequirelessairandconsequentlycostlesstooperate・As
7、withmanyapproacheswithreducingflowsyoucanbesurethattherearesomeshortcomings,althoughnewandpossiblyinnovativetechniquesareusedtoimprovetheircontainmentcharacteristics.有關減低實驗室排煙櫃排氣流量、降低初期投資及作度營運成本上一直都是主要的話題,低流量排煙櫃並不是一項新觀念,事實上在幾年前就有某些實驗室使用或是以限制其排煙櫃開度的方式以降低排煙櫃所需之氣流量,進而降低經常營運成本
8、。雖然在改進排煙櫃捕捉率上可能會有一些創新的技術,但在這麼多減低流量的方法之中,常常會有一些不足之處。低流量排木。最近,一些許多的設計者早已在從事重新設計其排煙櫃流體力學特質,S
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