4 • Heat Transfer

Name the types of Heat Transfer

Conduction

Convection

Radiation

Define Conduction

The transfer of heat through a medium without any overall medium of that medium

In what medium does conduction occur?

Solids

Name an example of a Solid

Metals

Demonstrate how heat moves through metals?

Heat transmits from one particle to another

Define Convection

The transfer of heat by the circulation of a fluid

Name an examples of Liquids

Liquids

Gases

Demonstrate how heat moves through liquids?

Convection currents

Define Radiation

The transfer of heat by electromagnetic waves

In what medium does radiation occur?

A Vacuum

Label This Diagram

The Heat Loss From a Building Structure

a - 20%

b - 30%

c - 30%

d - 20%

Define U-Value

The heat energy crossing 1m2 per second for every 1k difference between two sides

Define the SI Unit for U Value

Wm-2 K-1

Differentiate between High & Low U-Value

High U-Value - Poor insulation

Low U-Value - Good insulation

Define Solar Constant

Average amount of energy from the sun perpendicularly crossing 1m2 at the top of the earths atmosphere per second

Define the SI Unit for Solar Constant

Wm-2