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# TD - Coursework Example

## Extract of sample TD

The inner compartment is thermally insulated accompanied with a heat pump that continuously transfers heat from the inner partition to the external environment to ensure lower temperatures inside the fridge (Hewitt, 1998).
Part 2 – Construct a diagram that allows you to show the functions of its parts. If you use a pre-made diagram you may have to amend it to include detail or make sure that superfluous detail does not obscure your explanation from Part 1 or make your Part 3 unclear. The diagram only needs contain the most basic components of a refrigerator or heat pump.
Part 3 – Relate Part 1 to Part 2: talk about the diagram and explain which part fulfills which function in the machine and where the energy is needed, where it goes and how it changes with regards to the first and second law. Where applicable, include either the Kelvin-Planck or Clausius statements.
The liquid in the refrigerant form passes through the expansion valve resulting in a sudden decline in pressure. Reduced pressure causes the volatile liquid to expand, cool and vaporize into a gas as it enters into the inner compartment of the refrigerator. At the back of the fridge, there is a thick circular pipe through which the refrigerant passes. This pipe acts as a chiller cabinet that serves a crucial purpose of absorbing heat from the food inside the inner partition. According to Kelvin-Plancks law, transfer of heat occurs from a region of higher temperature to a region of lower temperature. After passing through the chiller cabinet the refrigerant advances to the compressor whose role is to squeeze the refrigerant and convert it into a hot, high-pressure gas. As the gas passes through a thin radiator, Kelvin Plancks law becomes useful as most of the heat in the refrigerant is given out, and it is reconverted into a liquid. The liquid passes ...Show more
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