Residential Energy Audit - Chapter 2

96 Questions | Total Attempts: 141

SettingsSettingsSettings
Please wait...
Residential Energy Audit - Chapter 2

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 amount of heating energy needed by the home during the heating season is the sum of:
    • A. 

      Heat transmission through the floor

    • B. 

      Exterior walls

    • C. 

      Ceiling

    • D. 

      Air leakage

    • E. 

      Solar radiation & Internal heat production

  • 2. 
    Total heating energy and total cooling energy does not include the inefficiencies of the heating & cooling system.
    • A. 

      True

    • B. 

      False

  • 3. 
    Identify the most likely older framing technique
    • A. 

      A is characteristic of older homes.

    • B. 

      B is characteristic of older homes.

  • 4. 
    Choose the correct statements:
    • A. 

      A is a drawing of platform framing

    • B. 

      B is a drawing of platform framing

    • C. 

      A is a drawing of balloon framing

    • D. 

      B is a drawing of balloon framing

  • 5. 
    In which one of the two drawings will the wall cavities most likely be connected to the to the attic and the basement?
    • A. 

      A

    • B. 

      B

  • 6. 
    In which one of the two drawings will you find pre-build roof trusses, platform framing  and 4'x8' - sheets of plywood or OSB sheating material for walls, floors and ceiling?
    • A. 

      A.

    • B. 

      B.

  • 7. 
    A plane defined by insulation and an air barrier is known as an _________ ___________
  • 8. 
    In hot climates energy efficient homes:
    • A. 

      Block solar radiation with exterior shade such as trees

    • B. 

      Reflective surfaces

    • C. 

      Window shading

    • D. 

      Have large cooling systems installed

  • 9. 
    Balloon framed construction are often found in homes build before _____________.
    • A. 

      1980

    • B. 

      1960

    • C. 

      1940

    • D. 

      1900

  • 10. 
    It is possible that you may find aspects of both platform frame construction and balloon frame construction in the same home.
    • A. 

      True

    • B. 

      False

  • 11. 
    When considering building structural types, which of the following statements are true?
    • A. 

      A = Planer structure

    • B. 

      A = Skeletal structure

    • C. 

      B = Skeletal structure

    • D. 

      B = Planer structure

    • E. 

      C = Skeletal/Planer Combination

  • 12. 
    The exterior walls of some homes are made completely from masonry materials: block, stone, brick or concrete. Indicate which of the following is also true about masonry materials.
    • A. 

      Masonry materials have listed R-values.

    • B. 

      The mass of masonry materials can slow heat transmission significantly

    • C. 

      Neither of these are true

  • 13. 
    Building portrusions and indentations lead to an increased number of seams and surface area.
    • A. 

      True

    • B. 

      False

  • 14. 
    Which of the following are known as points of weakness in a building structure?
    • A. 

      Porches

    • B. 

      Roof overhangs

    • C. 

      Shafts containing chimneys and pipes

    • D. 

      Indented doorways & windows

    • E. 

      Crawl spaces and basements connecting the home to the outdoors

  • 15. 
    Outdoor air and indoor air can mingle
    • A. 

      When wall cavities are partially or completely devoid of insulation.

    • B. 

      When suspended ceilings are installed between floors.

    • C. 

      Through attics and roof cavities

    • D. 

      Where plumbing pipes and wiring enter the building.

    • E. 

      Building cavities are used as ducts.

  • 16. 
    Mobile home point of weakness are:
    • A. 

      Suspended ceilings between floors

    • B. 

      Torn or missing belly paper

    • C. 

      Joints between the halves of double-section homes

    • D. 

      Joints between the main structure and building additions.

    • E. 

      Plumbing penetrations

  • 17. 
    Indicate which of the following portrutions , indentations, and penetratios are weakenesses found in multi family buildings?
    • A. 

      Thermal bridging from steel and aluminum coponents.

    • B. 

      Torn or missing belly paper

    • C. 

      Protruding or recessed balconies, eaves, canopies and windows

    • D. 

      Rooftop protrusions and penetrations, such as rooftop elevator shacks and air handlers

  • 18. 
    Which of the following are common conduits for air leakage that allow indoor air and outdoor air to mix in multi family buildings?
    • A. 

      Suspended ceilings, supply ducts in floor and ceiling cavities, building cavities used as return ducts

    • B. 

      Elevator shafts, plumbing shafts

    • C. 

      Chimneys, stairwells

  • 19. 
    The rate of heat transmission depends on ___________ and ______________.
    • A. 

      Location

    • B. 

      Relative humidity

    • C. 

      Thermal resistance

    • D. 

      Surface area

    • E. 

      Air leakage

  • 20. 
    Air leakage in cubic feet of air per minute (CFM) depends on the _______________ and the _____________________.
    • A. 

      Indoor and outdoor pressure differences

    • B. 

      Indoor pressure differences

    • C. 

      Surface area of the shell

    • D. 

      Surface area of the holes of the shell.

  • 21. 
    Windows are a bigger concern than doors because:
    • A. 

      Significant surface area

    • B. 

      Low thermal resistance

    • C. 

      Door have a relative small combined service area

  • 22. 
    During summer the main heat driving force is _________________.
    • A. 

      Solar radiation

    • B. 

      Outdoor and indoor temperature differences.

  • 23. 
    A building's thermal resistance determines how much  heat transmits through the shell.
    • A. 

      True

    • B. 

      False

  • 24. 
    When we say that insulation resists heat transmission , we mean it resists:
    • A. 

      Convection

    • B. 

      Radiation

    • C. 

      Conduction

    • D. 

      Non of these

  • 25. 
    In the case of an uninsulated wall cavity, __________________ and _________________ dominate  heat transmission.
    • A. 

      Radiation

    • B. 

      Conduction

    • C. 

      Convection

  • 26. 
    What is the symbol used to compare the thermal conductivity of different material?
    • A. 

      Kal

    • B. 

      K

    • C. 

      Kps

  • 27. 
    Aluminum is the mot conductive common building material.
    • A. 

      True

    • B. 

      False

  • 28. 
    Aluminum has the same thermal conductivity as steel.
    • A. 

      True

    • B. 

      False

  • 29. 
    One square foot of steel conducts the same amount of heat as: (assume the thickness of material is the same)
    • A. 

      200 square feet of wood

    • B. 

      50 square feet of concrete

    • C. 

      1000 square feet of glass wool

  • 30. 
    Choose the correct k value (thermal conductivity) for Aluminum  
    • A. 

      117

    • B. 

      17

  • 31. 
    Choose the correct k value (thermal conductivity) for steel
    • A. 

      117

    • B. 

      26

  • 32. 
    Indicate which list below correctly state the least to most conductive building materials.
    • A. 

      Air, glass wool, wood, steel, rubber, aluminum

    • B. 

      Wood, brick, glass, aluminum, steel

    • C. 

      Concrete, glass, steel, aluminum

    • D. 

      Glass wool, wood, glass, brick

  • 33. 
    The k-value is the amount of heat (BTUs) that will flow each hour through a 1 square foot slab of material 1 inch thick, with a _______ deg temperature difference of between the two sides 
    • A. 

      10

    • B. 

      2

    • C. 

      1

  • 34. 
    Heat conduction rate depend on the thickness of the material. If material X is 1/2 inch think and has a k-value of 2k what would the k-value be if this material was 2 inches thick.
    • A. 

      1/2k

    • B. 

      1k

    • C. 

      2k

  • 35. 
    What is stack effect?
    • A. 

      Cold air is forced out holes in the ceiling when warmer rises and push it upwards.

    • B. 

      Warm air rises and leaves the home through holes in the ceiling.

    • C. 

      When warm air leaves the home, cold air replaces it by entering the building through holes near the floor.

  • 36. 
    Which are true statements regarding windows?
    • A. 

      Windows are often build in thermal flaws.

    • B. 

      Windows are necessary for the residents mental health.

    • C. 

      Most older windows have R-values rated between R-1 and R-3.

    • D. 

      Newer windows have R ratings up to R-20.

    • E. 

      Windows are a major source of solar heat gain.

  • 37. 
    Indicate the true statement(s):
    • A. 

      The building's window surface area determine the level of comfort and extent of energy problems associated with windows.

    • B. 

      The window R-value determine the level of comfort and extent of energy problems associated with windows.

  • 38. 
    Select the correct statement(s):
    • A. 

      Window air leakage is the single biggest contributor to energy and comfort problem in a building.

    • B. 

      Window related discomfort comes mainly from a window's low radiant temperature and convection currents created by high heat transmittance.

    • C. 

  • 39. 
    A building's energy inspection and diagnosis include:
    • A. 

      Blower door tests

    • B. 

      Infrared scanners

    • C. 

      Utility bills analysis

    • D. 

      Heating efficiency testers

    • E. 

      Energy savings predictions

  • 40. 
    Conditioned space includes the building's heated and cooled areas.
    • A. 

      True

    • B. 

      False

  • 41. 
    The amount on air leakage depends on:
    • A. 

      Air pressure inside and outside the building

    • B. 

      The size of the holes through which air escapes the building.

  • 42. 
    Unintentionally conditioned and unconditioned spaces may include attics and crawl spaces. These areas are also known as ______________ ________.
  • 43. 
    After an energy auditor's evaluation of an building, the thermal boundary may include:
    • A. 

      Only conditioned spaces

    • B. 

      Conditioned space and unconditioned space

  • 44. 
    Factors involved in selecting a building's thermal boundary include:
    • A. 

      The shell's existing insulation level

    • B. 

      The effectiveness of existing air barriers.

    • C. 

      Incorporating potential areas of future use within the thermal boundary,

  • 45. 
    Airflow  carrying heat across the thermal boundary and around the insulation is a thermal __________________.
    • A. 

      Boundary

    • B. 

      Bypass

    • C. 

      Bridge

    • D. 

      Advantage

  • 46. 
    When determining whether or not to include a crawl space within the thermal boundary, the following should be considered:
    • A. 

      The ease and cost of air sealing and insulating the the floor versus air sealing and insulating the foundation walls.

    • B. 

      In cold weather climates it is not cost effective to insulate the foundation walls.

    • C. 

      In warm weather climates it is cost effective to insulate the foundation walls.

  • 47. 
    Energy auditors should use both energy-savings potential and practical considerations to decide whether to include the basement or crawl space within the thermal boundary.
    • A. 

      True

    • B. 

      False

  • 48. 
    Colder climates favor insulating the the floor between the crawl space and the house because the ground is colder.. 
    • A. 

      True

    • B. 

      False

  • 49. 
    Warmer climates favor insulating the the floor between the crawl space and the house because the ground is colder.
    • A. 

      True

    • B. 

      False

  • 50. 
    In warmer climates, including the thermal boundary is favored because heat loss to the cooler ground  may aid iin cooling the home.
    • A. 

      True

    • B. 

      False

  • 51. 
    Factors that will determine the inclusion of of unused basements and crawl spaces with the thermal boundary consists off:
    • A. 

      Heat transmission determined by the building's volume..

    • B. 

      A building's surface area

    • C. 

      Air leakage and pressure differences

    • D. 

      Possible future occupancy of a basement

    • E. 

      Relative difficulty of insulating and air sealing the floor

  • 52. 
    Whther the basement pipes will freeze in cold climates if the insualtion and air sealing measures are installed between the floor and and basement is a legitimate consideration for including the basement with in the thermal boundary.
    • A. 

      True

    • B. 

      False

  • 53. 
    Factors that favor excluding a crawl space from the thermal boundary include:
    • A. 

      Waste heat could be reduced at its source by insulating pipes, duct works and water heaters.

    • B. 

      If the crawl space will remain between the ground temperature and the outdoor temperature (usually above freezing) when no heat source are present.

    • C. 

      Floor insulation is inexpensive.

    • D. 

      Installing a heating cable for pipes is often cheaper than heating unused spaces to keep pipes thawed.

  • 54. 
    House A's floor, over an unused basement in a cold climate, is easily accessible for insulation and air sealing. The ducts are fairly airtight, but uninsulated. The floor is a fairly good air barrier, but the foundation is is leaky and difficult to insulate.
    • A. 

      This situation favors sealing the crawl space vents and then insulating and air sealing the the foundation. Thus, the basement is placed within the thermal boundary.

    • B. 

      This situation favors air sealing and insulating the ducts, air seal and insulate the floor , blow insulation into the walls of the basement stairway, and install an electric heating cable on the pipes close to the foundation's perimeter. The basements is thereby placed outside the home's thermal boundary.

  • 55. 
    Home B, is located in a mild climate, has a pump and pressure tanks in its crawl space. The ground under the house is covered by a moisture barrier and the house has no moisture problems. Ducts are fairly leaky and lack insualtion, and they would be difficult to insulate and air seal.
    • A. 

      This situation favors sealing the crawl space vents and then insulating and air sealing the the foundation. Thus, the basement is placed within the thermal boundary.

    • B. 

      This situation favors air sealing and insulating the ducts, air seal and insulate the floor , blow insulation into the walls of the basement stairway, and install an electric heating cable on the pipes close to the foundation's perimeter. The basements is thereby placed outside the home's thermal boundary.

  • 56. 
    An energy auditor should learn what construction materials were used in the building and how the walls floor and roof were put together.
    • A. 

      True

    • B. 

      False

  • 57. 
    An thorough outdoor inspection will look at things such as:
    • A. 

      Any vertical shafts coming through the roof.

    • B. 

      Protrusions or indentations, such as porches, bay doors, bay windows or cantilevered floors that break the continuity of the air barrier and insulation.

    • C. 

      Major seems between the building components.

    • D. 

      Attached or build in garage

    • E. 

      Air tightness of the exterior shell.

  • 58. 
    Diagnostic tools are available to energy auditors to help diagnose  building shell problems. These are:
    • A. 

      Blower door testing

    • B. 

      Tracer gas testing

    • C. 

      Infrared scanning

    • D. 

      Duct blower testing

  • 59. 
    Tracer gas testing measures air leakage at _______________ pressures.
    • A. 

      Increased

    • B. 

      Natural

    • C. 

      Decreased

  • 60. 
    During a duct blower test, the results show that the home has a duct leakage level of 26%. Which of the following conclusions would be correct.
    • A. 

      This is an average CFM25 measurement for existing duct systems

    • B. 

      This is a relatively tight existing duct system.

    • C. 

      This meets the Energy Efficient Builders Association (EEBA) standards.

    • D. 

      This meets EPA/DOE Energy Star standards.

    • E. 

      This is an extremely tight duct system.

  • 61. 
    During a duct blower test, the results show that the home has a duct leakage level of 17%. Which of the following conclusions would be correct.
    • A. 

      This is an average CFM25 measurement for existing duct systems

    • B. 

      This is a relatively tight existing duct system.

    • C. 

      This meets the Energy Efficient Builders Association (EEBA) standards.

    • D. 

      This meets EPA/DOE Energy Star standards.

    • E. 

      This is an extremely tight duct system.

  • 62. 
    During a duct blower test, the results show that the home  has a duct leakage level of 10%. Which of the following conclusions would be correct.
    • A. 

      This is an average CFM25 measurement for existing duct systems

    • B. 

      This is a relatively tight existing duct system.

    • C. 

      This meets the Energy Efficient Builders Association (EEBA) standards.

    • D. 

      This meets EPA/DOE Energy Star standards.

    • E. 

      This is an extremely tight duct system.

  • 63. 
    During a duct blower test, the results show that the home  has a duct leakage level of 8%. Which of the following conclusions would be correct.
    • A. 

      This is an average CFM25 measurement for existing duct systems

    • B. 

      This is a relatively tight existing duct system.

    • C. 

      This meets the Energy Efficient Builders Association (EEBA) standards.

    • D. 

      This meets EPA/DOE Energy Star standards.

    • E. 

      This is an extremely tight duct system.

  • 64. 
    During a duct blower test, the results show that the home  has a duct leakage level of 2%. Which of the following conclusions would be correct.
    • A. 

      This is an average CFM25 measurement for existing duct systems

    • B. 

      This is a relatively tight existing duct system.

    • C. 

      This meets the Energy Efficient Builders Association (EEBA) standards.

    • D. 

      This meets EPA/DOE Energy Star standards.

    • E. 

      This is an extremely tight duct system.

  • 65. 
    During a blower door test, the results show that the home has 12 air changes per hour @ 50 pascals or 0.80 ACHn (natural air changes per hours). Which of the following conclusions would be correct.
    • A. 

      The home is very leaky.

    • B. 

      It is an average reading for an existing home.

    • C. 

      This meets EEBA standards.

    • D. 

      This home's shell is extremely tight.

  • 66. 
    During a blower door test, the results show that the home has 8 air changes per hour @ 50 pascals or 0.53 ACHn (natural air changes per hours). Which of the following conclusions would be correct.
    • A. 

      The home is very leaky.

    • B. 

      It is an average reading for an existing home.

    • C. 

      This meets EEBA standards.

    • D. 

      This home's shell is extremely tight .

  • 67. 
    During a blower door test, the results show that the home has 3 air changes per hour @ 50 pascals or 0.20 ACHn (natural air changes per hours). Which of the following conclusions would be correct.
    • A. 

      The home is very leaky.

    • B. 

      It is an average reading for an existing home.

    • C. 

      This meets EEBA standards.

    • D. 

      This home's shell is extremely tight and exceeds EEBA standards.

  • 68. 
    During a blower door test, the results show that the home has 1 air changes per hour @ 50 pascals or 0.07 ACHn (natural air changes per hours). Which of the following conclusions would be correct.
    • A. 

      The home is very leaky.

    • B. 

      It is an average reading for an existing home.

    • C. 

      This meets EEBA standards.

    • D. 

      This home's shell is extremely tight and exceeds EEBA standards.

  • 69. 
    Tracer gas testing is more accurate than blower door testing in measuring natural air change rate, but less practical.
    • A. 

      True

    • B. 

      False

  • 70. 
    The amount of BTUs that needs to be removed or added to maintain a good level of comfort for the home's occupant is known as the  _____________ load.
  • 71. 
    Heat loss refers to the amount of BTUs flowing through the building shell monthly or annually.
    • A. 

      True

    • B. 

      False

  • 72. 
    Heat loss can be calculated from building shell characteristics and compared with energy consumption from the utility bills.
    • A. 

      True

    • B. 

      False

  • 73. 
    Cooling load is less predictable than heating load because of these important variables differ widely from home to home:
    • A. 

      Solar heat gain

    • B. 

      Air leakage

    • C. 

      Internally generated heat

  • 74. 
    Heating technicians and engineers, modify heating and cooling calculations regularly in various ways to make them more accurate. Without this, the calculations would be consistently off by 10% or 20% .
    • A. 

      True

    • B. 

      False

  • 75. 
    The u-factor is similar to the k-value, but the u-factor gives the amount of heat that transmits through a square foot of building cross-section composed of ___________________.
    • A. 

      A single slab of material.

    • B. 

      Multiple slabs of materials.

  • 76. 
    R-value measures the resistance of walls, floors and ceilings. U-factor is the inverse of R-value. therefor when R-value = 2 then then the U-factor  = ________.
    • A. 

      1

    • B. 

      0.50

    • C. 

      0.25

  • 77. 
    R-value measures the resistance of walls, floors and ceilings. U-factor is the inverse of R-value. therefor when R-value = 1 then then the U-factor  = ________.
    • A. 

      1

    • B. 

      0.50

    • C. 

      0.25

  • 78. 
    R-value measures the resistance of walls, floors and ceilings. U-factor is the inverse of R-value. therefor when R-value = 4 then then the U-factor  = ________.
    • A. 

      1

    • B. 

      0.50

    • C. 

      0.25

  • 79. 
    When considering R-values: R-10 + R-5 will equal _________________.
    • A. 

      R-15

    • B. 

      R values can not be added

  • 80. 
    When considering U-factors: U-1 + U-2 equals _________.
    • A. 

      U-3

    • B. 

      U-12

    • C. 

      U-factors can not be added

  • 81. 
    R-values are used to calculate power and energy needed for heating.
    • A. 

      True

    • B. 

      False

  • 82. 
    U-factors are used to calculate power and energy needed for heating
    • A. 

      True

    • B. 

      False

  • 83. 
    U-factors state how much heat transmits through a 1-square foot area of cross sectio (wall, floor, or ceiling) in one hour, when there is a 1deg F difference in temperature across the two opposite surfaces.
    • A. 

      True

    • B. 

      False

  • 84. 
    The quantity of heat transmission through the shell of a building depends on:
    • A. 

      The U-factor

    • B. 

      Its area

    • C. 

      The temperature difference between the indoors and the outdoors

    • D. 

      The period of time being considered

  • 85. 
    What is  the definition of Design Temperature?
    • A. 

      It is that temperature that equals or exceeds the three coldest months 70.5% of the time.

    • B. 

      It is that temperature that equals or exceeds the three coldest months 97.5% of the time.

    • C. 

      It is that temperature that equals or exceeds the three coldest months 100% of the time.

  • 86. 
    Indicate the possible reason(s) for calculating transmission heat loss.
    • A. 

      To predict the savings from weatherization retrofits.

    • B. 

      To calculate actual heating costs with predicted heating costs to investigate an building's energy consumption.

  • 87. 
    A Degree-day measures the duration and severity of outdoor temperature compared to a balance point temperature. The balance point is the minimum outdoor temperature at which no heating is required.
    • A. 

      True

    • B. 

      False

  • 88. 
    If the average temperature outdoor for a particular day is 30 deg F, what would the accumulated degree days for that day be?
    • A. 

      30

    • B. 

      35

    • C. 

      60

    • D. 

      65

  • 89. 
    Ventilation does not have the same energy effect as air leakage.
    • A. 

      True

    • B. 

      False

  • 90. 
    ________________________ should provide fresh air to a building at a minimum rate of 15 CFM per person or 0.35 air changes per hour. (Choose one)
    • A. 

      Air leakage

    • B. 

      Mechanical ventilation

    • C. 

      Air leakage and mechanical ventilation

  • 91. 
    The number of BTUs per hour of heating capacity needed by a building depends on climate, insulation levels, air leakage and heating installation quality. If a home requires 50 BTUs per hour per square foot of floor space it would be accurate to conclude that:
    • A. 

      The home is located in a cold climate

    • B. 

      The home has major air leakage or insulation problems

    • C. 

      It is an average home in a cold climate

    • D. 

      It is an average home in an temperate climate

    • E. 

      It is a well insulated home with low air leakage.

  • 92. 
    The number of BTUs per hour of heating capacity needed by a building depends on climate, insulation levels, air leakage and heating installation quality.  If a home requires 13 BTUs per hour per square foot of floor space it would be accurate to conclude that:
    • A. 

      It is an average home in a cold climate

    • B. 

      It is an average home in an temperate climate

    • C. 

      It is a well insulated home with low air leakage.

  • 93. 
    The number of BTUs per hour of heating capacity needed by a building depends on climate, insulation levels, air leakage and heating installation quality.  If a home requires 5 BTUs per hour per square foot of floor space it would be accurate to conclude that:
    • A. 

      It is an average home in a cold climate

    • B. 

      It is an average home in an temperate climate

    • C. 

      It is a well-insulated home and that is very airtight and most like has heat recovery ventilators.

  • 94. 
    Indicate the widely accepted  types of heat gain.
    • A. 

      Solar heat gain

    • B. 

      Air leakage

    • C. 

      Transmission

    • D. 

      Internal gains

  • 95. 
    Glass load factors consider which of the following:
    • A. 

      Window orientation

    • B. 

      Type of glass

    • C. 

      Interior shading devices

    • D. 

      Exterior shading devices

  • 96. 
    Shade line factor accounts for ___________________.
    • A. 

      Interior shading devices.

    • B. 

      Exterior shading from the building's overhangs.