37ch

The measurement of the amount of heat that will pass through one square foot of a material one inch thick, in one hour, when there is a 1°F temperature difference between the two sides of a material is ____.

K-value

Which of the following statements about basements and heat leakage is false?

Leakage through the basement floor is always calculated.

Most local building codes require that heat load calculations for low-rise residential buildings be performed in compliance with the ACCA ____ specification.

Manual J

The amount of heat that must be added or removed from a space in order to maintain the desired temperature in that space is referred to as ____.

heat load

If the air pressure inside a building is lower than the air pressure outside the building, air will leak in. This is known as air ____.

infiltration

Large sliding glass doors may be responsible for much of the solar heating and heat leakage in some homes.

true

Local building codes typically specify climate zones and design temperatures.

true

Low-emissivity windows can reflect infrared radiation onto nearby objects.

true

One way to prevent unwanted infiltration is to maintain a positive air pressure within the building.

true

The U-value of a material or component is the reciprocal of the total thermal resistance of the structure and the boundary air films associated with it.

true

The boundary air film is not replaced as frequently as the surrounding air because it is molecularly attracted to a surface.

true

The outdoor design temperature represents the lowest temperature that is expected to persist for an extended period of time.

true

The transfer of heat from one object or space to another continues until the temperatures are equalized.

true

When outdoor temperatures fall below those inside, some of the heat flow reverses itself and travels outward through the wall.

true

Which of the following statements about sunlight and heating loads is false?

In the northern hemisphere, the north facing windows and walls receive more direct sunlight during the day than the other three walls.

The increase of heat within a space that results from solar radiation or heat radiated by other sources is referred to as ____

heat gain

The measurement of the amount of heat that will pass through one square foot of the component in one hour (regardless of thickness) when there is a temperature difference of 1°F between one side of the component and the other is ____.

C-value

Which of the following about slab buildings and heat loss is true?

All of the above.

Latent heat in a building decreases as the moisture content in the air increases.

False

The measurement of a material's resistance to heat transfer is known as its ____.

R-value

Which of the following about crawl spaces is false?

The heat loss through a floor above a crawl space is calculated differently than that of an exterior wall.

A measure of heat transfer that includes an adjustment for boundary air films is ____.

U-value

Reducing sun loads can be accomplished by installing ___

awnings over windows glass with heat-reflecting qualities special heat-absorbing glass Correct! All of the above.

The term heat loss refers to ____.

heat from inside the building transferring to outside the building

If the air pressure inside a building is greater than the air pressure outside the building, air will leak out. This is known as air ____.

exfiltration

For the purpose of sizing an HVAC system, the maximum heat load is determined for a period of 15 minutes

false

Materials with high K-values transfer heat at a lower rate than those with low K-values.

false

When the temperature outside a conditioned space is warmer than the temperature inside the space, heat leakage results in heat loss.

false