Solving for Minimum Duct Diameter in a Hospital Room Air Exchange System

  • Thread starter Thread starter Naeem
  • Start date Start date
  • Tags Tags
    Thermo
AI Thread Summary
To determine the minimum duct diameter for a hospital room air exchange system, first calculate the room's volume, which is 120 cubic meters. The air must be replaced every 20 minutes, leading to a required volumetric flow rate of 6 cubic meters per minute. With a maximum air velocity of 5 m/s, the duct's cross-sectional area can be derived from the flow rate. Using the relationship between flow rate, area, and velocity, the minimum diameter of the duct can be calculated. This approach ensures efficient air exchange while adhering to the specified velocity limit.
Naeem
Messages
193
Reaction score
0
Q. The air in a 6m x 5m x 4m hospital room is to be completed replaced by conditioned air every 20 min. If the average air velocity in the circular air duct leading to the room is not to exceed 5 m/s, determine the minimum diameter of the duct.

We can figure out the volume of the room, knowing the dimensions then what.

time is given, what else can be done?
 
Engineering news on Phys.org
think about volume flow rate...
 
Ok, found out volume flow rate what next
 
- You have the volume of the room that needs to be replaced every 20 minutes. That should tell you something about the volumetric flow rate needed to come out of the duct.

- If you have a flow rate, what equation also contains the duct's cross sectional area and it's velocity?

Those are two pretty big hints there.
 

Thread 'Race car suspension Class'

Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
View full post »
Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Thread 'Physics of Stretch: What pressure does a band apply on a cylinder?'

Scenario 1 (figure 1) A continuous loop of elastic material is stretched around two metal bars. The top bar is attached to a load cell that reads force. The lower bar can be moved downwards to stretch the elastic material. The lower bar is moved downwards until the two bars are 1190mm apart, stretching the elastic material. The bars are 5mm thick, so the total internal loop length is 1200mm (1190mm + 5mm + 5mm). At this level of stretch, the load cell reads 45N tensile force. Key numbers...
View full post »

Thread 'Cantilever help'

I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
View full post »

Similar threads

Velocity of air moving past a duct.
Replies
1
Views
1K
What is the Average Flow Rate in a Room with Circular Ducts?
Replies
3
Views
5K
Solve Engineering Problem: Air Flow Speed in Duct for 3x4.5x6m Room
Replies
3
Views
2K
Does Turning on a Fan Affect Room Temperature?
Replies
9
Views
4K
How Long to Ventilate Linked Rooms to Safe Nitrogen Levels?
Replies
2
Views
2K
Max voltage of both air and water capacitors
Replies
14
Views
3K
Efficient Air Duct Design for 121m^3 Room | Air Conditioning System Calculation
Replies
3
Views
7K
What Is the Minimum Diameter of a Duct to Limit Head Loss to 20 Meters?
Replies
5
Views
8K
Complex Thermo-Dynamic System of Equations
Replies
2
Views
2K
Challenge Math Challenge - August 2021
Replies
46
Views
8K

Hot Threads

Recent Insights

Back
Top