1.What friction wander should be used to surface a television channel for a static cart drop of 0.1 in wc if the epithelial duct has a broad equivalent length of 150 ft? (57.10)
2.What size surface duct should be used to deliver whiz hundred seventy CFM with a wring drop of 0.15 in wc if the total equivalent length of 130 ft? (57.10) 7 in.
3.What friction dictate should be used to size a duct for a static pressure drop of 0.1 in wc if the duct has total equivalent length of 50 ft? (57.10) 0.2
4.What size metal duct should be used to deliver 270 CFM with a pressure drop of 0.15 in wc if the total equivalent length is 80 ft? (57.10) 8 in
5.What is the focal ratio of 500 CFM of air moving through a 10 in duct? (57.10) 900 fpm.
6. wherefore should all duct work designs start with an accurate soup up load study? (57.1) Proper duct system designs ar critical to the energy efficiency of a building.
7.Explain the pop off of the following duct components: (57.2) Ell be elbows used to make turns in duc cardinalrk, Wye is used to split one large duct into two smaller ducts, Transition is used to change extraneous ducts from one size to another, Boot is used at the end of a round duct to allow connection of a rectangular register or grill.
8.
What is the total available static pressure for ductwork for a system with the following specifications? (57.13)
9.Why should air velocity in branch ducts be limited to 600 fpm? (57.13) If air moves alacritous than 600 fpm it begins to make noise.
10.Why are duct friction charts designs for plane metal not accurate for fiberglass duct shape up or flexible ducts? (57.11) Most duct friction charts are designed for sheet metal not fiberglass or flex duct.
11.What is the difference between duct liner and duct neglige? (57.8) Duct liner is applied to the inside of the duct and duct wrap is fiberglass with an outer vapor barrier.
12.What is the mapping of the vapor barrier on the outside of duct wrap? (57.8) The vapor barrier prevents...If you want to get a full essay, order it on our website: Orderessay
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