Industrial Ventilation

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?

 

 

  1. 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

 

 

  1. 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 = ?

 

 

  1. The flow rate of an existing ventilation system is to be increased by 25%. About how much more power will be required?

 

 

  1. 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: use equations from chapter 6 or 8.

 

 

  1. Based on measurements of amps and volts, it is known that a ventilation system fan consumes approximately 8.0 shp. Other known values of the system are shown below. What fan total pressure (FTP) is likely to be measured?

STP (d = 1), Q = 10,000 scfm, ME = fan efficiency = 0.60 (60%),Kdl = 1.7.

 

 

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