08 Jul SAFE 4160 University of Central Missouri Indust
SAFE 4160 University of Central Missouri Industrial Ventilation Quiz
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Asked: Apr 5th, 2019
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uploaded the questions and the chapters needed.
Tags: University of Central Missouri University of Central Missouri Industrial Ventilation UCMO Ventilation systems Hood static SAFE 4160
ch_8.pdf
quiz_7_on_ch8_fan.docx
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SAFE 4160: Industrial Ventilation 1. You identify a fan with inlet and outlet conditions: SPin = -3.65” w.g., SPout = +0.60” w.g., and VPin = VPout = +0.45” w.g. What are FTP and FSP for the fan? 2. You are designing a ventilation system with the following parameters. What is the required shaft horsepower (sph) for the ventilation system, and what rated power motor (rhp) would you choose? FTP = 15.0 inch w.g. Q = 1,300 scfm ME = fan efficiency = 0.65 Kdl = 1.05 STP (d = 1) c = 6356 3. What is the new flow rate, hood static pressure, and brake horsepower expected when rpm is increased to n = 1,450 rpm? Hint: Use fan law equations. Initial Conditions Conditions after Increase n = 1220 rpm n = 1450 rpm Q = 1,300 scfm Q=? SPh = 0.85 inch w.g. SPh = ? bhp = 1.3 hp bhp = ? 4. The flow rate of an existing ventilation system is to be increased by 25%. About how much more power will be required? 5. The hood static pressure is first measured at SPh = – 0.75” w.g. and volume flow rate through the hood is Q1 = 1040 cfm. If the hood static pressure changes to SPh = -0.55” w.g., what is the new flow rate, Q2? Assume other conditions remain same. Hint
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