Task 2.2 - Solve practical problems involving heat and describe

conduction, convection and radiation of heat with suitable

examples.

A) Draw a typical temperature vs time graph for a 15kg block of ice, with a starting

temperature of -40°C and assuming a constant heat energy source is applied until the final

temperature is 120°C. Identify on the chart the state of the material at each stage, and

explain in your own words the shape of e graph.

B) For the block of ice above, calculate the total heat energy (Q) required to raise the

temperature from -40°C to 120°C.

Assume the below:

Melting point= 0°C

Boiling point = 100°C

Specific Heat Capacity, C, for:

Ice = 2108 J/KgK

Water = 4187 J/kgK

Water vapour (steam) = 1996 J/kgK

Specific latent heat of fusion for water = 334 kJ/kg

Specific latent heat of vaporisation of water = 2264 kJ/kg

Your answer should make clear the sensible heat energy required, the latent heat energy

required, and total heat energy required.

c) Describe in your own words the three principal forms of heat transfer. Given relevant

examples of where each type of heat transfer is used.