Residential Energy Audit - Chapter 3

30 Questions | By Jacoventer | Last updated: Mar 19, 2022 | Total Attempts: 173

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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

Questions and Answers

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.