Question

explain how energy is conserved in a heat pump

Answer 1

in a heat pump the working substance goes thruogh the following steps:
1) sudden expansion of the gas from high to low pressure which cools it & converts it into vapour-liquid mixture.
2) Absorption by a cold fluid of heat from the region to be cooled, converting it into vapour.
3) Heating up of the vapour due to external work done on the system
4) Release of heat by the vapour to the sourroundings, bringing it to the initial state & completing the cycle.
this is how energy is conserved in a heat pump