Insulation and Interior Inspection Section#1 Insulation and Ventilation Quiz#2

This study session covers heat and temperature, heat transfer, the control of heat flows, how insulation works, and the control of air leakage.

The estimated completion time for this study session is forty-five minutes.

Objectives
At the end of this Study Session, you should be able to:

• Define the following
  
  • heat and temperature, giving the units for each.
  • sensible heat.
  • latent heat of vaporization.
  • Latent heat of fusion
  • Thermal conductivity (k).
  • Thermal conductance (c).
  • Wind washing
• List six thermal conductors.
• List three thermal insulators.
• Describe in one sentence the role of air in insulation.
• Define thermal resistance (R).
• Name one good thing about air leakage.
• Name one bad thing about air leakage.

• Question 1

  Needs Grading

  	Define conductance.
  	Selected Answer: The conductance (C) is equal to the number of BTUs that will pass through one square foot of the material over the course of 1 hour (with a 1F temperature difference across the material).  Correct Answer:   A measure of heat transfer through materials that are not homogeneous or have large air voids Response Feedback: [None Given]

• Question 2

  Needs Grading

  	Define heat and give its imperial units.
  	Selected Answer: Heat is the thermal energy of a body.  Heat is measured in BTU. One BTU is amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. A match has roughly one BTU of thermals energy.  Correct Answer:   Amount of thermal energy in a body Response Feedback: [None Given]

• Question 3

  Needs Grading

  	Define latent heat of fusion.
  	Selected Answer: Latent heat of fusion is the name for the significant amount of heat required to change a body to liquid.  Correct Answer:   Energy used to change from solid to liquid state without changing temperature Response Feedback: [None Given]

• Question 4

  Needs Grading

  	Define latent heat of vaporization.
  	Selected Answer: Latent heat of fusion is the name for the significant amount of heat required to change a liquid to vapor.  Correct Answer:   Energy used to change from liquid to vapour state without changing temperature Response Feedback: [None Given]

• Question 5

  Needs Grading

  	Define sensible heat.
  	Selected Answer: Sensible heat causes the temperature to change but not the state of the object.  Correct Answer:   Heat that causes temperature to change Response Feedback: [None Given]

• Question 6

  Needs Grading

  	Define temperature and give its imperial units.
  	Selected Answer: The temperature is the level of the thermal energy in the body.  Correct Answer:   Level of thermal energy in a body ? Fahrenheit (°F) Response Feedback: [None Given]

• Question 7

  Needs Grading

  	Define thermal conductivity.
  	Selected Answer: The thermal conductivity of a homogeneous material is equal to the number of BTUs that will pass through one square foot of the material (1 inch thick) over the couse of 1 hour (with 1F temperature difference across the material) Correct Answer:   1. Rate of heat transfer over a period of time (usually hours) 2. A unique property for every material Response Feedback: [None Given]

• Question 8

  Needs Grading

  	Define thermal resistance.
  	Selected Answer: The thermal resistance of a material is the reverse or the reciprocal of its conductivity.  Correct Answer:   The inverse of thermal conductivity, a convenient number to describe the resistance of a material to heat transfer. Response Feedback: [None Given]

• Question 9

  Needs Grading

  	Define wind washing.
  	Selected Answer: Wind moving through a roof or wall assembly can reduce the R-value of the insulation dramatically because insulation works by keeping air pockets still.  Correct Answer:   When wind blows across insulation, it disturbs the air pockets in it, reducing the insulation value. Response Feedback: [None Given]

• Question 10

  Needs Grading

  	List six thermal conductors.
  	Selected Answer: 1. Steel 2. Lead 3. Concrete 4. Copper 5. Plaster 6. Stone 7. Glass 8. Clay Correct Answer:   1. Steel 2. Lead 3. Copper 4. Concrete 5. Plaster 6. Stone 7. Glass 8. Clay Response Feedback: [None Given]

• Question 11

  Needs Grading

  	List three thermal insulators.
  	Selected Answer: 1. Cork 2. Sawdust 3. Some plastics Correct Answer:   1. Cork 2. Sawdust 3. Some plastics Response Feedback: [None Given]

• Question 12

  Needs Grading

  	List three types of heat transfer.
  	Selected Answer: 1. Conduction 2. Radiation 3. Convection Correct Answer:   1. Conduction, radiation or convection 2. Evaporation applies to people only! Response Feedback: [None Given]

• Question 13

  Needs Grading

  	Name one bad thing about air leakage.
  	Selected Answer: Moisture problem Correct Answer:   We lose a lot of heat, and energy costs are higher. Response Feedback: [None Given]

• Question 14

  Needs Grading

  	Name one good thing about air leakage.
  	Selected Answer: unhealthy environment in the house Correct Answer:   It changes the air in the house, so we don?t end up with stale, polluted air and an unhealthy environment. Response Feedback: [None Given]

• Question 15

  Needs Grading

  	What role does air play in insulation materials?
  	Selected Answer: The more air it has in it, the better insulator it's likely to be Correct Answer:   Air is a good insulator on its own, so materials with a lot of air voids make good insulators. Response Feedback: [None Given]