Bcn1210 Test 5 Review - Envelope I - Ch5

Front 1

What are the four environmental parameters that affect the building envelope?

Back 1

1. Thermal
2. Air
3. Vapor
4. Water

Front 2

Objects at ___ temperature always flow into the ___ temperature.

Back 2

Hot flows to cold

Front 3

List the modes of heat transfer.

Back 3

1. Conduction (solids)
2. Convection (gas/liquid)
3. Radiation (waves)

Front 4

___ is a constant property (quality) of a material representing the ability of the material to resist the flow of heat through it.

Back 4

Thermal resistivity

Front 5

___ is a measure of the ability of a material of a specified thickness to resist the flow of heat through it.

Back 5

R-value

Front 6

A material with a high R-value resists the flow of heat, and is called a ___.

Back 6

Thermal insulator

Front 7

A material with a low R-value allows the flow of heat, and is called a ___.

Back 7

Thermal conductor

Front 8

How do you determine thermal resistivity?

Back 8

resistivity =R-value/thickness (in)

Front 9

ρ= R/t
Thermal resistance is influenced by:

Back 9

1. density
2. moisture content
3. entrapment of air/gas

Front 10

Name the cellular structures of various plastic foam insulations.

Back 10

1. Beaded structure: easy air movement
2. Closed-cell structure: vapor barrier, nothing gets through

Front 11

R-inside and R-outside from envelope assembly always equals __.

Back 11

1

Front 12

How does U-value compare to R-value?

Back 12

U-value is the inverse of R-value.
U-value is weighted, R-value is added
U-value=1/(R1+R2+R3 etc)

Front 13

What are the benefits of placing insulation on the outside of an assembly, instead in the middle or interior of building?

Back 13

1. reduces energy consumption because it eliminates (or reduces) thermal bridging in the envelope
2. moderates the temperature of structural, reducing expansion/contraction, thereby increasing life span

Front 14

Insulating materials are divided into what categories?

Back 14

1. fibrous insulation
2. granular insulation
3. foamed insulation

Front 15

List types of fiber insulation.

Back 15

1. Batts
2. blankets
3. semi-rigid boards

Front 16

List types of granular insulation.

Back 16

1. Expanded perlite granules
2. expanded vermiculite granules
3. expanded polystyrene (EPS) granules