Air Flow & Blow dryer
Subject
Climatology
,Academic Year
2'nd Year
,Complexity Level
Beginner
,Content tags
Active Cooling
,Air Motion
,Ducting
,Activity Type
Demonstration
,Activity duration
< 1 hour
,Objective:
To understand and measure the difference in the rate of flow of air when it is made to pass through a specific pathway/ducting versus when it is spread over a larger generalized space
Outcome:
Students will comprehend the fact that ducting improves the flow of air which is useful for designing both passive and energy-efficient active cooling in building structures
Requirements:
Blow dryer, digital anemometer, plier (to hold the blow dryer), 1 m long PVC pipe having diameter equal to or just greater than the mouth of blow dryer, a table.
Prerequisites:
A conceptual knowledge of flow of air.
Procedure:
Step 1: Clamp the blow dryer with the plier.
Step 2: Place the plier on the table such that the air stream coming out from the blow dryer is parallel to the table.
Step 3: Place the anemometer 1 metre apart from the mouth of the blow dryer such that it is collinear with the axis of air stream coming from the mouth of blow dryer.
Step 4: Note the air flow rate from the anemometer in km/hr.
Step 5: Place a PVC pipe at the mouth of the blow dryer.
Step 6: Place the anemometer at the other end of the pipe.
Step 7: Note the air flow rate from an anemometer in km/hr.
Step 8: Compare the air flow rate in both cases.
Air Flow Rate (Without Pipe)(km/hr) | Air Flow Rate (With Pipe)(km/hr) |
Step 9: Try the same demonstration with a bent pipe. Does the rate of flow of air change? How much? What can we learn from this?
Step 10: Discuss examples of where this principle has been applied in general and specifically in buildings
References:
Case 1:
Case 2: