Past exam of the physics B course of the University of Cambridge / 2013 / Paper 2 / Section C / C12 / ii

For the ideal reversible comparison,

T_{H} = 293.15

K and the coldest air source is

268.15

K. Thus

COP_{air} = \frac{293.15}{25} = 11.73, \frac{W _{air}}{W _{direct}} = \frac{25}{293.15} = 0.0853.

A real air-source pump uses more work than this reversible lower bound, and its low-temperature performance is not specified.

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