Cold beer to hard Home trainer with heat pump. In the left tub is a bottle of beer, but at the required pedaling to make the beer cool, it's likely to give up before.  

Cold beer to hard

Home trainer with heat pump. In the left tub is a bottle of beer, but at the required pedaling to make the beer cool, it's likely to give up before.

A good example to collect personal experience with the princip of a heat pump.