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Arch 273 Exam 2

Terms in this set (46)

wind speed and direction
In a cross ventilation strategy, the pressure differences that cause the air to move through a space are due to_____________________.
differences in height
In a stack ventilation strategy, the pressure differences that cause the air to move through a space are due to______________________.
Rectangular, oriented east to west
The orientation recommended by 2030palette.org as the ideal form for both passive heating and cooling is:
potable water
water that is safe to drink
stormwater
Water originating as rain, snow, and ice melt. Contributes to runoff
Greywater
gently used water from bathroom sinks, showers, tubs, and washing machines. It is not water that has come into contact with feces, either from the toilet or from washing diapers
Blackwater
Water that contains feces and urine; also called "sewage"
cross ventilation
Air flow created when air travels in one side of a home and out another.
Stack Ventilation
driven by principle that hot air rises
night flush cooling
Incorporates thermal mass in the walls, floor, and/or ceiling (concrete floors)
Cross ventilation
air flow at ceiling level
Cross Ventilation through clerestory windows encourage:
Air flow to people
Cross ventilation at lower levels encourage:
Stack Ventilation
45 degrees
Location of cross vent. openings from prevailing winds
Greater than or equal to
Size of outlet openings compared to inlet openings
min 10 ft apart in height
Location of openings in residential stack vent.
min 15 ft apart in height
Location of openings in commercial stack vent.
the greater the air movement
Stack Vent: the greater the height between openings,
stack is twice as tall as the height of the tallest space to be ventilated
Stack Vent rule of thumb for height:
4 in
Night Flush min thickness
1 to 3 times
Night flush surface area to floor area:
Direct gain
sunlight is admitted into the living spaces, directly through openings or glazed windows, to heat the walls and floors and thereby the air inside
Indirect gain
also called a Trombe wall or a thermal storage wall) is a south-facing glazed wall. Sunlight is absorbed into the wall and it heats up slowly during the day
occupants reside in direct and reside next to indirect
Difference of direct and indirect gain
direct gain
indirect gain
Cob
Poor insulator, good thermal mass
Strawbale
Good insulator (about R-3 per inch)
Strawbale
Has the lowest carbon impact out of any insulation material (sequesters carbon)
cob
Has almost zero embodied carbon impacts
in code, but as appendixes
Strawbale and cob construction in relation to building codes:
Expanded polystyrene
Board insulation: EPS
Extruded polystyrene
Board insulation: XPS
Mineral wool insulation
fiber-based loose-fill insulation
Can go underground
Board insulations...
Below R-5
Batt insulations R-value
Fiberglass insulation
made of plastic reinforced by tiny glass fibers.
Cellulose Insulation
is treated, ground-up newspaper that is blown into wall cavities and attics; it is normally gray in color
R10. Everything else is half or less
Limit to R-Value
heat and moisture in the air
What does a psychrometric chart show the relationship between?
Plot dry bulb air temp on x axis, scale humidity ratio of the air on y axis
How to plot a point on a psychrometric chart
vertical only
Direction point moves when changing latent heat
Horizontal only
direction point moves when changing sensible heat
Latent heat
heat absorbed or radiated during a change of phase at a constant temperature and pressure. Heat we cannot feel
Sensible heat
the heat we can feel and measure with a thermometer
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