Reversed heat engines (AQA A-Level Physics): Flashcards

Move heat from cold to warm region using external work

Heat naturally flows from warm to cold regions

Removes heat from cold space, transfers to warm space

Transfers heat from outside (cold) to inside (warm)

Yes, COP can be greater than 1

Heat transferred per unit of work done

$\text{COP}_{\text{ref}} = \frac{Q_C}{W} = \frac{T_C}{T_H - T_C}$

$\text{COP}_{\text{hp}} = \frac{Q_H}{W} = \frac{T_H}{T_H - T_C}$

5 J of heat transferred for every 1 J of work done

Transfer >1 J heat per 1 J work done