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What is a Heat Pump?

2017/7/31      view:

What is a Heat Pump?


It does just what it suggests, it pumps heat, taking energy from a (relatively) low temperature source and forces that heat to a higher temperature making it more useful. It is analogous to a water pump which raises water from low level to a higher level, a heat pump does the same – but with heat!

 

This diagram is purely illustrative of the effect of a heat pump and not its operation.


Even ice still has some heat energy, in fact energy is always present until the value of "absolute zero" is reached some –273.16°C, which is why the Kelvin scale has its start point at absolute zero (and hence freezing point is +273.16 Kelvin).

We should all be familiar with a heat pump since we most likely have one at home! A domestic refrigerator (or even freezer) is a heat pump – it pumps heat out of the device, thus cooling the inside.