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E Tech II: Passive Cooling_qz05
n/a
11
Architecture
Undergraduate 3
11/20/2011

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Cards

Term
in high humidity, _________________ is key.
Definition
comfort ventilation
Term
in areas with, or during periods of, low humidity, ___________ and ______________ can be beneficial
Definition
night flush cooling and night radiation
Term
reason for the flow of air:
Definition

natural convection currents caused by differences in temp.

or

difference in pressure

Term
four types of air flow
Definition

1. laminar (parallel)

2. separated (varying speeds)

3. turbulent (interrupted)

4. eddy (circ. pools)

Term

TRUE or FALSE:

Since air flow has some mass, moving air tends to go in a straight line.

When forced to change direction, air streams will follow curves but never right angles.

Definition
TRUE
Term

TRUE or FALSE:

Lines representing air streams should be drawn with broken lines

Definition
FALSE (should be drawn as continuous)
Term
As air hits the windward side of a building, it _________________________
Definition
compresses and creates positive pressure
Term
air is sucked away from the leeward side of the building creating ___________
Definition
negative pressure
Term
Bernoulli Effect
Definition
an increase in the velocity of a fluid decreases its static pressure (i.e. its dynamic pressure increases)
Term
Venturi Effect
Definition
air velocity increased by the shape of the roof
Term
stack effect
Definition

can exhaust air from a building by the action of natural convection

can be combined with the Bernoulli effect to create good vertical ventilation

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