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chapter 2
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Indicate whether the statement is true or false.
1. An advantage of using heating load estimating software is that calculations may be saved for future use.
a.
True
b.
False
2. All building surfaces that separate heated space from unheated space are known as the thermal barrier.
a.
True
b.
False
3. Air film resistance represents the insulating effects of thin layers of air that cling to all surfaces.
a.
True
b.
False
4. A typical slab-on-grade foundation loses more heat to the ground below than to the air at the exposed edges of the slab.
a.
True
b.
False
5. Materials with higher R-values conduct heat more slowly than materials with lower R-values.
a.
True
b.
False
Indicate the answer choice that best completes the statement or answers the question.
6. The daily usage of domestic hot water depends on which factors?
a.
occupancy, type of water fixtures, water pressure, and time of year
b.
square footage of the home, living habits, and water pressure
c.
peak hourly consumption, type of water fixtures, and time of day
d.
hot water heater capacity and its set temperature
7. Which term refers to the temperature contour lines found on a typical finite element analysis diagram?
a.
slope lines
b.
conduction coefficients
c.
resistance lines
d.
isotherms
8. What is the typical effect of framing members that span across insulation cavities?
a.
Framing members reduce the effective total R-value.
b.
Framing members increase the effective total R-value.
c.
Framing members do not influence the effective total R-value.
d.
More framing members are generally preferred to reduce heat loss.
9. What assumption can be made when using heating degree days to estimate seasonal energy consumption?
a.
The number of heating degree days each month is the yearly total divided by 12.
b.
Heating is needed if the average monthly temperature falls below the historical average for that area.
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chapter 2
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c.
Heating is needed if outside air temperature drops below 65° F.
d.
Heating is needed if outside air temperature drops below 55° F.
10. What is a practical method to measure the airtightness of an existing or partially-constructed building?
a.
blower door testing
b.
exhaust rate testing
c.
window seal testing
d.
inspecting windows for cracks
11. What is the first step in designing a space heating system?
a.
Select the primary fuel source.
b.
Calculate the design heating load of each room.
c.
Determine whether renewable energy sources will be used in a primary or auxiliary fashion.
d.
Estimate the airtightness of the building based on construction quality.
12. When applying the degree day method, what correction factor is used to compensate for the effect of internal heat
gains and warm-weather degree days?
a.
delta T
b.
Cd
c.
Dd
d.
K
13. How do you determine the total R-value of a composite (made up of several materials) assembly?
a.
Add the individual R-values.
b.
Add the individual R-values and divide by the number of materials.
c.
Add the inverses of the individual R-values.
d.
Add the individual U-values.
14. Where does domestic water heating rank in terms of largest energy consumption in a typical North American home?
a.
first
b.
second
c.
third
d.
fourth
15. What is the standard unit for representing the heat transfer characteristics of a window, door, or skylight?
a.
unit U-value
b.
unit T-value
c.
isotherm units
d.
percentage of total room heat loss
16. Which method is typically used to determine infiltration heat loss?
a.
degree day method
b.
average R-value method
c.
balanced air equations
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d.
air change method
17. What is the maximum air leakage rate permitted in an Energy Star-certified house?
a.
2 air changes per hour at 50 Pascals
b.
4 air changes per hour at 50 Pascals
c.
10 air changes per hour at 50 Pascals
d.
15 air changes per hour at 50 Pascals
18. What rating is assigned to all electric, gas, and oil-fired storage type water heaters sold in the United States?
a.
peak hour rating
b.
first hour rating
c.
demand-load rating
d.
last hour rating
19. What is the best way to estimate peak hourly water demand in a household?
a.
Consult a DOE table.
b.
Make an educated guess based on the number of people in the household.
c.
Discuss or monitor hot water usage patterns with the occupants.
d.
Peak hourly water demand does not vary much between households, so a standard value may be used.
20. What measurement is directly proportional to the R-value of a material?
a.
surface area of the material
b.
length of the material
c.
thickness of the material
d.
orientation of the material
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chapter 2
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Page 4
Answer Key
