§3 insulating

• Natuurkunde
• Middelbare school
• havo, vwo
• Leerjaar 3

§3 Insulating

Questions about the worksheet?

Your answer by question 4?

Learning objectives

• You can explain ways that a house loses heat.
• You can explain how a dynamic equilibrium is reached between heat loss and heat production.
• You can explain how you can reduce heat loss in a house. 

Insulation is limiting.

Heat insulation limits the heat from leaving the house.

Heat transports from high to low temperatures. 

- Geleiding

- Stroming

- Straling

Conduction

Radiation

Convection

Heat loss due to conduction

Heat loss through a substance: Conductors such as metals transmit heat quickly. That means they lose a lot of heat.

Insulators like glass/plastic/paper conduct heat poorly. As a result, you have little heat loss. 

Heat loss through flow

Heating of a liquid or gas -> convection

You counteract heat loss through convection by ensuring that warm air cannot escape.

Heat loss through radiation

You prevent heat loss through radiation by reflecting the radiation back. You can do this by using reflective material.

Conduction

Convection

Radiation

Through an (intermediate) substance. Substance does not move but transfers heat to the next particle of the substance.

The particles of the (intermediate) substance heat up and move themselves to a point where they release the heat again. 

Heat is radiated from one point to another without an intermediate substance.

Reducing heat loss

Insulating !

• hr +++ glas instead of single and double glass
• Filling cavity wall with insulation material.
• Insulate roofs and floors.
• Insulate heating pipes.
• Cover surfaces with foil (behind heating).
• Seal gaps with a draft strip.

Cavity wall insulation

The cavity is a space between the interior and exterior walls. This space consists of air. 

Air also insulates, but insulating material can optimize this. 

Floor and ceiling insulation

The ceilings and floors are also a place where you lose heat. You can solve this through insulation. 

Double glass

Single glass consists of 1 layer of glass. Double glass has 2 layers of glass with a space of air (or gas) between them. 

Assignments 1 t/m 6