9289 Scientific Principles (Heat Transfer Worksheet)

According to the session objectives, what relationship will be explored?

• How units of energy and heat are related and derived

• How water pressure is measured

• How to install domestic heating systems

• How to calculate pipe diameters

Why is it important to understand the methods of heat transfer in plumbing and domestic heating?

• To ensure efficient energy use and system design

• To improve water taste

• To reduce the cost of plumbing materials

• To increase the speed of water flow

Select the three correct methods by which heat can be transferred.

• Conduction, convection, and radiation

• Conduction, insulation, and evaporation

• Convection, absorption, and insulation

• Radiation, insulation, and evaporation

Explain how the process of convection differs from conduction in the transfer of heat.

• Convection involves direct contact, while conduction involves fluid movement.

• Convection involves fluid movement, while conduction involves direct contact.

• Both involve radiation.

• Both require insulation.

Given the list: Copper, Aluminium, Iron, Glass, Brick, Water, Wood, Polystyrene, Still air, which material would you expect to be the worst conductor of heat?

• Still air

• Iron

• Aluminium

• Glass

If you were to design a system that requires minimal heat loss, which material from the list would you most likely avoid using as an insulator?

• Polystyrene expanded

• Silver

• Wood

• Polyethylene HD

If the inside temperature is 21°C and the outside temperature is -3°C, what is the temperature difference across the wall?

• 18°C

• 21°C

• 24°C

• 17°C

Given a wall with an area of 18 m², a U value of 0.18 W/mK, and a temperature difference of 24 K, calculate the heat loss through the wall.

• 58.32 Watts

• 32.58 Watts

• 81.36 Watts

• 24.18 Watts

Which method is the principal way a domestic hot water cylinder heats up the water?

• Radiation

• Conduction

• Convection

• Evaporation

What is the temperature at which water is at its most dense?

• 0°C

• 10°C

• 4°C

• 100°C