Not saying this will be very effective:
(1) The usual domestic fridge has a radiator on the back and transfers heat from inside the fridge to the room containing the fridge. So opening the door just recirculates warm and cool air with no gain.
(2) The usual Motor Home fridge is inside with the cooling vents outside, so heat is transferred from the inside of the fridge (and the Motor Home) to the outside world. So opening the door will attempt to cool the whole inside of the Motor Home by moving heat to the outside world.
The result will probably be warm beer, but I was idly wondering how much heat a large fridge could move to the outside.
(1) The usual domestic fridge has a radiator on the back and transfers heat from inside the fridge to the room containing the fridge. So opening the door just recirculates warm and cool air with no gain.
(2) The usual Motor Home fridge is inside with the cooling vents outside, so heat is transferred from the inside of the fridge (and the Motor Home) to the outside world. So opening the door will attempt to cool the whole inside of the Motor Home by moving heat to the outside world.
The result will probably be warm beer, but I was idly wondering how much heat a large fridge could move to the outside.