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How fast does air with a velocity pressure of 0.20 in wg move through a square duct?
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How fast does air with a velocity pressure of 0.20 in w.g. move through a round duct?
1800 ft min
How can measure the velocity in the duct?
existing duct = velometer (Google velometer). Calculate velocity if volume is known and the size of duct volume (cubic feet) multiplied, square feet feet of duct, IE. 1000 cubic foot of air * 12" x12" square duct = 1000 cubic feet * 1sq. foot = 1000 feet per minute
What is the difference between HVAC diffuser's neck velocity and face velocity?
In HVAC terminology, a diffuser's neck velocity is defined as the velocity of air traveling through the duct work to the air outlet or inlet. The difference of the face velocity is this is a measurement of fume hood performance.
What is formula for converting face velocity into cubic feet per minute?
You need to know the area of the pipe or duct. If you have that area, in square feet, V = Q/A where V = velocity (ft/minute in this case), Q = flowrate (cubic feet/minute in ths case), and A = area (square feet in this case). Then, you just have to apply conversions to get whatever units you want to present or use the answer in.
Can x rays see through duct tape?
Yes, x-rays can see through duct tape.
How fast does air with a velocity pressure of 0.20 in w.g. move through a round duct?
1800 ft min
How can measure the velocity in the duct?
existing duct = velometer (Google velometer). Calculate velocity if volume is known and the size of duct volume (cubic feet) multiplied, square feet feet of duct, IE. 1000 cubic foot of air * 12" x12" square duct = 1000 cubic feet * 1sq. foot = 1000 feet per minute
What does a heat exchanger fan do?
Dissipates the heat produced by the heat exchanger through convection and creates static and velocity pressure to distribute the hot air throughout the duct system.
What is pressure loss?
decrease in pressure from one point in a pipe or a duct to another point downstream of the fluid flow. It is due to frictional forces on a fluid that flow through a pipe or a duct
What is the working principle of convergent-divergent nozzle?
A NOZZLE IS A DUCT WHICH CONVERT HEAT ENERGY INTO KINETIC ENERGY.IT INCREASES VELOCITY OF FLUID PASSING THROUGH IT ,AT THE EXPENCE OF PRESSURE. STEAM EXPANDS IN NOZZLE FOLLOW RANKINE CYCLE.FLOW THROUGH NOZZLE IS ISENTROPIC. mritunjay04@gmail.com
What is the difference between HVAC diffuser's neck velocity and face velocity?
In HVAC terminology, a diffuser's neck velocity is defined as the velocity of air traveling through the duct work to the air outlet or inlet. The difference of the face velocity is this is a measurement of fume hood performance.
How do you calculate duct size with area given?
if the area given is 100 square inches you can use 10" by 10" duct due to a black art known as aerodynamics or compressible fluid flow, you will get the same back pressure in a 10" diameter round duct and a 2" x 50" duct considerably more back pressure a nice manufactured 90 will take as much back pressure as 50' of duct a tight curved 90 will take as much as 100 feet of duct fans have a curve that goes from maximum cfm at no pressure to minimum cfm at max pressure the fan will require the most power when cfm * pressure is highest simple as rocket science i guess
Why the return duct of AHU is larger than supply duct?
The air is returning at a lower velocity, so you need a larger size duct.
What is formula for converting face velocity into cubic feet per minute?
You need to know the area of the pipe or duct. If you have that area, in square feet, V = Q/A where V = velocity (ft/minute in this case), Q = flowrate (cubic feet/minute in ths case), and A = area (square feet in this case). Then, you just have to apply conversions to get whatever units you want to present or use the answer in.
What is the airflow velocity within a branch duct if the flow rate is 175 cfm and the duct is 12 inches high by 18 inches wide?
answer is
What is condensate blowoff?
Condensate blowoff is water that condenses on an evaporator coil, is blown off the coil, and then carried a short distance down the duct by the velocity of the air through the coil.
How much pressure does it take to break a strip of duct tape?
Look on Mythbusters. They have a whole episode about duct tape.
