Insulation

Question 1

What three (3) ways can heat be transferred?

Answer 1

• Conduction
• Convection
• Radiation

Question 2

What are some purposes of insulation?

Answer 2

Keeps thing warm, or cool, which increases efficiency. It also protects damage due to exposure due to heat, or corrosive atmospheres. Another common application is to prevent water condensation on cold surfaces.

Question 3

What is another application for insulation?

Answer 3

Sound proofing.

Question 4

What are the three insulation categories?

Answer 4

Cryogenic (below -10 1°C) Thermal (between -10 1°C to 815°C) Refractory (above 815°C)

Question 5

What is cryogenic insulation?

Answer 5

It is used in the temperature range of -101 down to absolute zero. Cryogenics often is used to keep liquefied gasses in the liquid state.

Question 6

How are containers for cryogenics constructed?

Answer 6

In an insulated material to withstand extremely low temperatures without losing their strength. Usually a container inside a container similar to a thermos.

Question 7

What is cellular glass?

Answer 7

It is a common cryogenic range insulation. It is light weight rigid material made up of millions of completely sealed glass cells and each one in an isolated space. It is extremely abrasive.

Question 8

What is super insulation?

Answer 8

The term applied to insulating blankets developed for spaceflight. The blanket consists of approximately 50 to 100 layers per inch of aluminized mylar separated by thin air spaces.

Question 9

Describe thermal insulation?

Answer 9

Most common type of insulation, there are three subcategories of thermal insulation- low temp, intermediate temp, high temp Typical materials are fiberglass, rock wool, foamed plastics.

Question 10

What is effectively used in insulating building materials?

Answer 10

Small air pockets in the material greatly increase its insulation.

Question 11

What are the three thermal insulation categories?

Answer 11

• Fibrous
• Cellular
• Granular

Question 12

Describe fibrous insulation?

Answer 12

Made from long small diameter fibers that divide the air into many tiny compartments. Fiberglass and mineral wool are commonly used.

Question 13

Describes cellular insulation?

Answer 13

Use the principle of dividing the air pockets into tiny compartments. Foamed in plastics such as polystyrene and polyurethane are common.

Question 14

What is granular insulation?

Answer 14

It is a loose horrible material such as vermiculite. Is commonly is used to fill the void inside hollow brick walls.

Question 15

Define Refractory insulation?

Answer 15

Typical applications are steel foundries and cement and lime kilns.

Question 16

What are the different forms of refractory insulation available?

Answer 16

• Castable
• Standard And Specially Shaped Bricks
• Gunnite Mixes
• Ramming Mixes

Question 17

What is a castable refractory

Answer 17

Made of minerals that withstand high temperature in the way they form ceramic, glass, or crystalline bond with manufactured.

Question 18

What are refractory bricks?

Answer 18

They are used to line the surface of a kiln. The bricks are non conducting, and thick enough to keep the steel shell from becoming red hot and warping

Question 19

What is gunnite?

Answer 19

It is mixed to a specific consistency, similar to mixing concrete, and is then sprayed onto the surface

Question 20

What is a ramming mix?

Answer 20

Has the consistency of thick plasticine. These mixes are used mainly for patching and for filling in small areas where it is too difficult to cut bricks to match.

Question 21

What things are considered when selecting insulation

Answer 21

• Thermal Properties,
• Mechanical Properties
• Chemical Properties

Question 22

What is temperature conductivity?

Answer 22

Thermal conductivity is similar to thermal conductance except that conductivity is rated on a 1 inch thick section of insulation. It is known as the K value. The lower the number the better the K factor is

Question 23

What is thermal resistance?

Answer 23

It is the resistance to flow through a unit of area. It is known as the R value, and the higher the number, the better.

Question 24

Define insulation?

Answer 24

Any material that is a poor conductor of heat or electricity that is used to stop or slow down the flow of heat or electricity.

Question 25

Prolonged noise over ___db is not considered safe

Answer 25

70 db

Question 26

What are some methods of sound control?

Answer 26

Moveable curtains can reduce noise by 25db Curtains with core acoustic insulation.

Question 27

What is cladding?

Answer 27

Also called jacketing. Protects the insulation from moisture and in some cases UV rays

Question 28

What are some materials for cladding?

 *not important just for reference*

Answer 28

• Aluminum sheeting
• Stainless steel for sheeting
• PVC
• Woven tape
• Cloth sheets
• Plastic
• Foil laminates
• Roofing felt

Question 29

As much as 98% of insulation problems are related to_____

Answer 29

Moisture

Question 30

What is the purpose of a moisture barrier?

Answer 30

Prevents condensation from getting into the insulation. It is always put on the warm side of the insulation.