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The stack pressure is created by 10m height of stack and 15°C temperature difference. The motive force due to the stack pressure over a cross section area of 2.5 m2 is _____N.
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- 15.75
- 5.75
- 75.75
- 15
Correct Option: A
Stack effect or chimney effect is the movement of air into and out of buildings, chimneys, fluegas stacks, etc, resulting due to a difference in indoor-to-out door air density, resulting from temperature and moisture differences. The result is either a positive or negative buoyancy force. The greater the thermal difference and the height of the structure, the greater the buoyancy force, and thus the stack effect.
Stack pressure in N/sq m, P = 0.042 × h × ∆T
Stack pressure = 0.042 × 10 × 15 = 6.3 N/sq m
Stack pressure over given cross-sectional area = 6.3 × 2.5 = 15.75 N
