Residential Energy Audit - Chapter 3
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Residential Energy: Cost Savings and Comfort for Existing Buildings [Book] by John Krigger, John Krigger & Chris Dorsi - House & Home - Saturn Resource Management, Inc. (2004) - Paperback - 318 pages
- 1.The _________ combined with the ___________ defines the thermal boundary.
- A.
Air barrier
- B.
Insulation
- C.
Walls
- D.
Attic
- E.
Crawl space
- 2.The main goals of air leakage control are to:
- A.
Save energy
- B.
Increase comfort
- C.
Reduce vermin in the house
- D.
Enhance fire safety
- E.
Avoid moisture migration into building cavities.
- 3.Indicate the correct measurement for air leakage through construction materials.
- A.
CFM
- B.
CFM25 per 100 square ft
- C.
CFM50 per100 square ft
- 4.Which of the following materials are not considered to be air barriers?
- A.
Standard concrete block
- B.
Spray on cellulose
- 5.Direct air leakage occurs at:
- A.
Windows
- B.
Doors
- C.
The building shell
- 6.Indirect air leakage occurs at:
- A.
Windows
- B.
Doors
- C.
The building shell
- 7.The wind, furnace blower and stack effect tend to pressurize some areas of the home and depressurize others.
- A.
True
- B.
False
- 8.The pressures created by stack effect is greatest at the ____________ points.
- A.
Highest and lowest
- B.
Mid
- 9.The wind is blowing at 40mph. The leeward side, facing away from the wind, is usually either ______________ or ______________.
- A.
Pressurized, neutral
- B.
Depressurized, neutral
- 10.What is the area between positive and negative pressure in a home called?
- A.
Neutral zone
- B.
Neutral pressure zone
- C.
Neutral pressure plane
- D.
Zero pressure zone
- 11.Exhaust fans and cloths dryers create a slight vacuum and therefor also move the neutral pressure plane _____.
- A.
Up
- B.
Down
- 12.Why does the neutral pressure plane move up when a cloth dryer is turned on?
- A.
The buildings interior space is under more negative pressure.
- B.
The buildings interior space is under more positive pressure.
- C.
The neutral pressure plane is always in the middle and never moves up or down.
- 13.A fan that forces air into the home moves the neutral pressure plane ____.
- A.
Up
- B.
Down
- 14.A hole near the neutral pressure plane of the home allows an ______________air leakage.
- A.
Minimal
- B.
Average
- C.
Excessive
- 15.The wind speed ____________ the higher from the ground you measure.
- A.
Decreases
- B.
Increases
- 16.Exhausts fans and cloth dryers move the neutral pressure plane up because more of the interior space is under negative pressure.
- A.
True
- B.
False
- 17.A fan that blows air into the home moves the neutral pressure plane up because more of the interior space is under positive pressure.
- A.
True
- B.
False
- 18.What does the acronym "MVG" stand for?
- A.
Maximum Ventilation Guideline
- B.
Minimum Ventilation Guideline
- 19.Indicate which of the following is NOT part of preparations and setup of a blower door test?
- A.
Closing primary windows and storm windows
- B.
Closing all interior doors
- C.
Disabling heaters and water heaters by turning down their thermostats.
- D.
Covering ashes in wood stoves and fireplaces with damp newspaper to prevent the ashes from being sucked into the home.
- E.
Shutting fireplace dampers, fireplace glass doors, wood stove dampers, wood stove air intakes.
- 20.CFM is the unit of measurement for cubic feet per minute. What does CFM50 refer as a read out from a blower door test.?
- A.
Cubic feet per minute divided by half of the air pressure in the home
- B.
Cubic feet per minute at 50 pascals of house pressure
- 21.A home must have sufficient air leakage or whole house ventilation.
- A.
True. Either one is very effective in providing the home with fresh air.
- B.
True. However air leakage is not desirable because it tends to over-ventilate the building in leaky zones and under ventilate in tighter zones.
- C.
False. Only whole house ventilation can provide adequate fresh air inside the home.
- 22.ASHRAE suggests a minimum ventilation rate of _____ CFM per person or 0.35 ACHn, whichever is greater.
- A.
1
- B.
15
- C.
30
- 23.ASHRAE suggests a minimum ventilation rate of 15 CFM per person or ____ ACHn, whichever is greater under natural conditions.
- A.
0.53
- B.
0.45
- C.
0.35
- 24.Home A has a MVG of 1000. Home B has a MVG of 3000. Indicate which of the following are factors that influence the MVGs in these single family homes.
- A.
Climate
- B.
Number of occupants
- C.
Building height
- D.
Shielding o the building from trees
- 25.You are auditing a single family home with four occupants living in it. The blower door flow reading is at 5000 CFM50. Which of the following would be a correct conclusion.
- A.
This is the minimum ventilation guideline set by ASHRAE is being met.
- B.
Whole house ventilation is recommended.
- C.
Carefully targeted air sealing should produce some energy savings.
- D.
Minimum ventilation guideline set by ASHRAE is not being met.
- E.
Thorough air sealing efforts should produce impressive energy savings.
- 26.A single family home with a blower door flow reading of 1500CFM50 _________________________________.
- A.
Leaves a lot of room for improvement.
- B.
Is hard to improve on.
- 27.Depressurization of a combustion zone is often set at ______ pascals with reference to the outdoors.
- A.
-3 to -5
- B.
-5 to -10
- C.
-15
- 28.Depressurization limit of a combustion zone is often set at -3 to -5 pascals with reference to the __________.
- A.
Outdoors
- B.
Indoors
- 29.During a blower door test you can also pressurize the home instead of depressurizing it, and then observe the attic floor from the attic to spot signs of air blowing through the ceiling into the attic.
- A.
True
- B.
False
- 30.Indicate the correct and acceptably way(s) to do a rough test to find the area in the building with the most air leakage during a blower door test.
- A.
Compare rooms to one another by closing the door to a 1-inch-wide opening and feeling how much air is coming from each room.
- B.
Close interior doors one by one and measure the pressure difference between the home's main body and the room.
- C.
Open and close doors to rooms and note the effect on the blower door airflow.
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