What is the Average Flow Rate in a Room with Circular Ducts?

AI Thread Summary
The discussion revolves around calculating the average flow rate of air in a room with specific dimensions and circular ducts. The room measures 3.5m by 4.5m by 6.0m, and the ducts have a diameter of 0.30m, requiring the air to be exchanged every 12 minutes. Participants clarify that the volume of the room can be found using the formula for volume (width times length times height). After determining the volume, the conversion to cubic meters per second is necessary for flow rate calculations. The discussion concludes with a successful resolution of the problem, highlighting the importance of understanding volume and flow rate in HVAC systems.
jerryez
Messages
20
Reaction score
0

Homework Statement


A room measures 3.5m by 4.5m by 6.0m. If the heating and air conditioning ducts to and from the room are circular with diameter of 0.30m and all the air in the room is to be exchanged every 12 min, (a) what is the average flow rate ?


Homework Equations


A1*V1=A2*V2


The Attempt at a Solution


I can find the area of the conditioning duct. I am not sure how to find the velocity of the air or the area of the room. Is it saying the room is a traingle shape? HELP
 
Physics news on Phys.org
It is simpler than that. The rate IS the volume of the whole room every 12 minutes.
 
Do you know how to calculate the volume?
Width times length times height.
 
Thankyou so much montoyas7940!:smile: I figured it out thanks to your help. I am so happy! I found the volume of the room by what you said and then I just converted it to meters cubed per second because it was meters cubed per 12minutes.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Solving for Air Speed in an Air Duct
Replies
1
Views
1K
What is the solution to the circular duct problem?
Replies
3
Views
2K
Volume flow rate through air ducts
Replies
1
Views
5K
Deriving the Equation for Average Water Mass Flow Rate in Water Rocket Launches
Replies
12
Views
4K
The Pressure Distribution in a Narrowing Tube with Increasing Fluid Velocity
Replies
10
Views
4K
How to determine when compressible flow is choked?
Replies
4
Views
2K
Flow rate of air through constriction
Replies
10
Views
3K
Bernoulli's equation to find the flow rate
Replies
3
Views
2K
What Is the Mass Flow Rate at Exit in a Steady Flow System?
Replies
1
Views
1K
Thermofluids: Air Flow Measurement (Pitot & Venturi)
Replies
6
Views
3K

Hot Threads

Recent Insights

Back
Top