Chapter 6 LO4 AND LO5 Heat Pumps

Question 1

Go to Ex 6.4 Q1 a) .in textbook

Answer 1

A: Condenser
B: Expansion Valve

Question 2

Explain how heat pump technology raises the heat energy from the ground to a level suitable for domestic purposes. You should refer only to the evaporator and compressor.

Answer 2

1,Heat energy is absorbed from the ground in a collector loop
2. In the evaporator this heat causes a refrigerant to become gaseous
3. The pressure of the gas is raised in the compressor, this causes the temperature to be increased to a level which is useable for domestic purposes.

Question 3

With reference to the roles played by the evaporator, compressor, and condenser. Describe how the application of heat pump technology in the figure below(EX 6.4 Q2) extracts low grade heat from the outside air and converts it to high grade heat suitable for domestic heating and hot water

Answer 3

1. Heat from the outside air causes the refrigerant to turn into a gas in the evaporator
2. The gas is pumped through a compressor which raises its temperature
3. The gas turns back to a liquid in the heat exchanger/condenser
4. Transferring its heat to the heating circuit of the house