Residential Energy Audit - Chapter 9

42 Questions | Total Attempts: 45

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Residential Energy Audit - Chapter 9

Questions in this quiz are based on the following book: 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. 
    Water heaters use energy in three ways: Demand, standby and distribution.Which are true statements?
    • A. 

      Demand means energy is used for heating incoming cold water.

    • B. 

      Distribution means heat loss through storage tank's walls.

    • C. 

      Stanby refers to heat loss through storage tank walls.

    • D. 

      Distribution losses consists of heat losses thorough the pipes and fixtures.

  • 2. 
    Stanby energy accounts for 20% to 60% of total water heating energy.
    • A. 

      True

    • B. 

      False

  • 3. 
    • A. 

      True. Hot water rises out of the tank, cools of in nearby pipes and then falls back down into the tank.

    • B. 

      False. Hot water can not flow out of the tank without at least one faucet open.

  • 4. 
    First hour rating or recovery capacity does not effect the design of a hot water heating system.
    • A. 

      True

    • B. 

      False

  • 5. 
    Water heating systems in single family homes are designed for recovery capacities of ___ to ___ gallons per hour per resident.
    • A. 

      20 to 40

    • B. 

      10 to 30

    • C. 

      3 to 20

  • 6. 
    Water heating systems in multi family homes are designed for recovery capacities of ___ to ___ gallons per hour per resident.
    • A. 

      20 to 40

    • B. 

      13 to 20

    • C. 

      3 to 10

  • 7. 
    Energy factor in water-heating assumes that residents use 64 gallons per day. Which energy losses does it account for?
    • A. 

      Water heating process

    • B. 

      Pilot light

    • C. 

      Storage tank losses

  • 8. 
    Design of water heating systems is based on three interlaced factors:recovery capacity, energy input and storage capacity. These are determined by:
    • A. 

      Occupancy

    • B. 

      Building size

    • C. 

      Number of plumbing fixtures

    • D. 

      Per capita use

  • 9. 
    A sacrificial anode protects the tanks steel parts against corrosion.
    • A. 

      True

    • B. 

      False

  • 10. 
    Storage water heaters with better warranties incorporate features such as:
    • A. 

      Larger tanks

    • B. 

      Improved tank coatings

    • C. 

      Auxiliary sacrificial anodes

    • D. 

      Curved dip tubes, that make flushing sediment more efficient

  • 11. 
    All storage water heaters sold after _________ have a Energy guide Label
    • A. 

      May 1996

    • B. 

      May 1990

    • C. 

      May 1980

    • D. 

      May 1969

  • 12. 
    The Energy Guide Label  is intended for comparison shopping and not for actual operating cost and performance.
    • A. 

      True

    • B. 

      False

  • 13. 
    For a fairly airtight residential structure , the oil-fired water heater should have a draft inducer to minimize the indoor air it consumes and to provide more reliable draft than the barometric draft control.
    • A. 

      True

    • B. 

      False

  • 14. 
    With regard to electric water heaters, which of the following is true.
    • A. 

      Electric water heating is typically 1.5 to 2 times more expensive.

    • B. 

      Electric water heaters have lower standby losses and higher energy factors than similar gas, propane and oil heaters because they do not have flue pipes running up the center of the tank.

    • C. 

      Electric heaters tend to have thicker insulation.

    • D. 

      Electric heaters are easier to install than gas, propane and oil heaters

    • E. 

      Electric heaters have higher storage capacity to compensate for their slower recovery capacity.

  • 15. 
    Any weatherization, heating - and air conditioning work in a building constitutes draft & CO testing.
    • A. 

      True

    • B. 

      False

  • 16. 
    Induced-draft water heater uses a fan to pull the combustion gases through the flue in the center of the tank. The draft fan also:
    • A. 

      Regulates the air that passes through the burner.

    • B. 

      Minimizes the amount of excess air during combustion

    • C. 

      Limit airflow through the flue during combustion during the off cycle

    • D. 

      Makes these types of water heaters safer, because it uses less indoor air

    • E. 

      Provide a more reliable draft

  • 17. 
    Sealed combustion water heaters uses a combustion and venting system that is separate from the house.
    • A. 

      This type water heater is great for tightly sealed homes.

    • B. 

      Thus type is better for leaky homes.

    • C. 

      This type is commonly used in mobile homes when installed in the living space.

    • D. 

      This type is not recommended for use in mobile homes when installed in the living space.

  • 18. 
    Integrated space and water heaters may be the choice of the future because the combined efficiency of a single heater providing both space and water heating is higher than two separate units doing the heating.
    • A. 

      True

    • B. 

      False

  • 19. 
    Tankless water heaters heat water as water flows through the heater. Which of the following statements apply to tankless water heaters?
    • A. 

      Also called instantaneous water heaters.

    • B. 

      Also called on demand water heaters

    • C. 

      Eliminates standby losses

    • D. 

      Available with recovery efficiency that ranges from 78% to 95%

    • E. 

      Taking a shower and running a dishwasher may easily stretch this type water heater to its limit.

  • 20. 
    Tankless water heaters heat water as water flows through the heater. Which of the following statements apply to tankless water heaters?
    • A. 

      Do not install a tankless water heater with a draft diverter

    • B. 

      The 89+ and 90+ units are equipped with draft-assisting fans.

    • C. 

      Sealed combustion or direct vent units are the best choice for both efficiency and safety.

    • D. 

      Tankless water heaters are a problem for utility companies because of their large power draw.

  • 21. 
    An indirect water heater derives its heat from:
    • A. 

      Solar collectors

    • B. 

      A boiler

    • C. 

      A second electric hot water heater

    • D. 

      Heat pump

    • E. 

      Air conditioner

  • 22. 
    Advantage of indirect water heaters include:
    • A. 

      Eliminate the need for a chimney with heat losses.

    • B. 

      They are safe because they emit less combustion gases.

    • C. 

      They are safer because they do not burn fuel or need combustion air.

    • D. 

      An indirect water heater cab beat the efficiency of a direct water heater if it is well insulated and and coupled to a boiler which also provides space heating.

  • 23. 
    Tankless coils waste energy because it forces the operation of a large boiler during the summer months.
    • A. 

      True

    • B. 

      False

  • 24. 
    Thermosiphoning solar heaters  move water from the collector to a storage tank on top of the collector using the buoyancy of hot water..
    • A. 

      True

    • B. 

      False

  • 25. 
    Solar water heaters are normally connected to backup water heaters in case of cloudy weather.
    • A. 

      True

    • B. 

      False

  • 26. 
    Increasing water heating efficiency to existing water heating systems follow which of the following strategies?
    • A. 

      Installing a smaller heater

    • B. 

      Reducing the use and waste of hot water

    • C. 

      Reducing standby losses from storage tank and pipes.

    • D. 

      Reducing distribution losses pipes and fittings.

  • 27. 
    Measures to reduce hot water waste include:
    • A. 

      Low flow shower heads.

    • B. 

      Using pressure reducing valves.

  • 28. 
    Stanby losses can be minimized by
    • A. 

      Pipe insulation

    • B. 

      Heat traps

    • C. 

      Reducing water temperature

    • D. 

      Tank insulation

  • 29. 
    Distribution losses can be minimized by
    • A. 

      Minimizing pipe diameter

    • B. 

      Minimizing pipe length

  • 30. 
    There are two types of low flow shower heads. Select the two correct descriptions in the list below.
    • A. 

      Aerating low flow shower heads do not mix water and air at the nozzle,but instead, form individual streams of water.

    • B. 

      Aerating low flow shower heads do mix water and air forming a misty spray.

    • C. 

      Laminar-flow shower heads do not mix water and air at the nozzle,but instead, form individual streams of water.

    • D. 

      Laminar-flow shower heads do mix water and air forming a misty spray.

  • 31. 
    Pressure reducing valves reduce hot water flow rate.
    • A. 

      True

    • B. 

      False

  • 32. 
    Technicians do not insulate the tops of gas-fired storage tanks because:
    • A. 

      Vinyl facing used as insulation is combustible

    • B. 

      It might interfere the draft diverter.

  • 33. 
    When installing or replacing electric storage heaters, placing them on top of an insulated platform is a very cost effective way to save energy.
    • A. 

      True

    • B. 

      False

  • 34. 
    Heat traps prevent heat loss by preventing convection.
    • A. 

      True

    • B. 

      False

  • 35. 
    Pipe insulation can reduce heat losses three ways
    • A. 

      Slows the direct conduction of heat through distribution pipes

    • B. 

      Reduce the the loss of convected heat through the hot and cold water pipes near the tank.

    • C. 

      Thirdly, insulated pipes deliver water 2deg F to 4 deg F hotter than uninsulated pipes.

  • 36. 
    When matching pipe sleeve's inside diameter to the pipes outside diameter is important for a snug fit. Most galvanized steel pipes are ______ of an inch larger in outside diameter than its normal size.
    • A. 

      1/8

    • B. 

      1/4

    • C. 

      1/3

  • 37. 
    If the pipes are within 8 inches of the flue, fiberglass pipe wrap without facing and wires into place is the safest choice.
    • A. 

      True

    • B. 

      False

  • 38. 
    The thickness of fiberglass insulation around pipes that are at least 8 inches from the flue should be at least _____ inche(s) thick.
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

    • E. 

      5

  • 39. 
    The sacrificial anode extends the life of the tank. With softened water, the anode should be replaced every _________ years. This could extend the normal 8-10 year water heater lifespan another 10 years.
    • A. 

      2 - 3

    • B. 

      3 -4

    • C. 

      4-5

    • D. 

      6-7

    • E. 

      8-10

  • 40. 
    Hard water at 160 deg F  can deposit 8 to 10 times more scale than 120 deg F hard water.
    • A. 

      True

    • B. 

      False

  • 41. 
    Water softeners ads salt to domestic water. Identify downside(s) to softened water.
    • A. 

      Increase sediment buildup

    • B. 

      Increase the risk to people with already high blood pressure.

    • C. 

      Salt softened water corrode anodes 2 to 3 times faster.

  • 42. 
    Signs of sediment buildup includes:
    • A. 

      Noise in gas water heaters

    • B. 

      Noise in electric heaters

    • C. 

      Odors in both gas and electric water heaters

    • D. 

      Bottom-element burnout in electric water heaters