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ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
ACH 121 Lecture 11b (Thermal & Moisture Protection)
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ACH 121 Lecture 11b (Thermal & Moisture Protection)

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  • 1. Thermal & Moisture Protection Why MOISTURE protection is needed? Types of Moisture Protection Why THERMAL protection is needed? Types of Thermal Protection
  • 2. Thermal Protection Why it’s needed? General Purpose of Thermal Protection Measurement of Thermal Property Types of Insulating Materials This Lecture:
  • 3. Why is insulation so important?
    • Basic Principal:
      • Heat moves from warmer to colder areas.
      • On cold days, warm air from inside tries to get out.
      • On warm days, the hot air outside is trying to get in.
      • Insulation slows this process.
  • 4. Why is insulation so important?
    • Helps keep buildings cooler in summer, warmer in winter
      • This keeps the occupants at a comfortable level
    • Retards the passage of heat through exterior surfaces
    • Reduces energy consumption of the building for heating & cooling
  • 5. Why is insulation so important?
    • Methods of Heat Transfer:
      • Conduction: physical contact
      • Convection: flow of a fluid (air & liquid)
      • Radiation: electromagnetic waves
    • Almost all building materials offer some resistance to heat flow. However, in order to achieve total resistance, the addition of insulating materials is necessary.
  • 6. General Purpose
    • The primary goal of thermal insulation is to control heat transfer through its exterior assemblies and thereby prevent excessive heat loss in colder seasons and heat gain in warmer seasons.
    • This is to reduce the amount of energy required for an acceptable comfort level that is lost or gained within the building shell.
  • 7. Areas to Insulate
  • 8. Measurement of Thermal Properties
    • In all building assemblies, a desired insulating factor must be achieved. This is calculated using simple formula showing resistance to heat flow and coefficients of heat transfer.
    • There are equations that help determine how much insulating property a particular material has .
    • These equations also indicate how much energy will be lost or gained within the building system.
    • These are shown as an “R-value” .
  • 9. Measurement of Thermal Properties
    • R = the measure of a material’s resistance to heat flow. It is shown by the temperature difference necessary to cause heat to flow through a given unit area of material. This is calculated at a rate of one heat unit per hour.
    • R T = the measure expressing the total thermal resistance for a construction assembly. This is the sum of all individual R-values of the assembly’s component materials.
  • 10. Measurement of Thermal Properties
    • U= the coefficient of the overall heat transfer of a material. This is expressed as the rate of heat transfer through a unit area of a particular building component. This is caused by a difference of 1  between air temperatures on each side of the building component. This is the reciprocal of the R-value.
    • 1/k = is the measure of thermal property per inch of thickness.
  • 11. Measurement of Thermal Properties
    • 1 /c = is the measure of thermal property per thickness indicated.
    • k = conductivity; heat transfer through 1” of a single material
    • c = conductance; heat transfer through other than 1” of a single material
    R = 1/k or 1/c 1 R 1 + R 2 + R 3 + R 4 U =
  • 12. Measurement of Thermal Properties
  • 13. Measurement of Thermal Properties
  • 14. Measurement of Thermal Properties
    • Additional Factors That Effect Heat Loss/Gain:
      • Color and reflectivity of material surface
      • Mass of building component assembly
      • Building orientation on site; how the environment affects the building’s exterior faces
      • Latent heat sources and gain from the occupants, lighting and equipment within a building
      • Proper installation of thermal insulation and vapor barriers
  • 15. Measurement of Thermal Properties
    • Factors That Effect Selection of Insulating Material:
      • Resistance to moisture
      • R-value per inch thickness of material
      • Cost per inch thickness & per unit of R-value
      • Cost per U-value for construction assemblies
      • Chemicals that may be emitted
      • Flammability/combustibility
      • Physical strength
      • Surface temperatures
      • Dimensional stability
  • 16. Types of Insulating Materials
    • Batt or Blanket:
      • a sheet of material made from fiberglass or rock wool that is installed between studs, joists, rafters or furring
  • 17. Types of Insulating Materials
  • 18. Types of Insulating Materials
    • Rigid Foam Boards:
      • type of sheathing that is made from cellular glass or polystyrene (styrofoam) that is applied over a roof deck, wall framing or beneath a finish material.
  • 19. Types of Insulating Materials
    • Foamed-In-Place
      • a type of porous foam that is sprayed or blown in to insulate irregular shaped spaces.
  • 20. Types of Insulating Materials
    • Loose Fill:
      • loose particles made from fiberglass, cellulose, vermiculite or perlite that is blown in to insulate attic floors and wall cavities
  • 21. Types of Insulating Materials
    • Lightweight Insulating Concrete (Cast):
      • insulating concrete that is poured into place. Used primarily as an insulating layer under membrane roofing. Uses vermiculite concrete aggregate.
  • 22. NEXT CLASS Doors and Windows Read Chapter 8

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