Question 3 a) Using annotated diagrams, explain the workings of a Vapour Compression Refrigeration System. You should include details of the changes of the state of the refrigerant as it goes

through the refrigeration cycle. [13 marks] (Word limit: 300 words) b) Refrigeration can also be achieved with a Vapour-Absorption System. Using diagrams where appropriate, explain the main principles of this system and the advantages and disadvantages of this compared to a Vapour Compression system. [12 marks] (Word limit: 250 words)