[remotemass (OP)]

Imagine outside a fridge we have a tube pipe in the form of a "U" and the endings A and B of that tube being holes connecting the internals of the fridge allow for the liquid circulating inside to keep at a very low temperature (using the fridge). Can this simple thing eventually leak quite a lot of water with the ideal pipe and the ideal way to curve around and around?

[Bored chemist]

Yes
https://en.wikipedia.org/wiki/Dehumidifier#Potability

[evan_au]

There are already pipes which circulate a coolant outside your fridge.
- However, the purpose of these pipes is to shift heat from the inside of the fridge to the outside of the fridge
- to get the inside of the fridge below ambient temperature, these pipes outside the fridge have to be above ambient temperature, so they won't cause much condensation

The system as you describe would shift heat from outside the fridge (in the condensing humidity) to the inside of the fridge. This is the opposite of why most of us have fridges.

A better scenario is an air conditioner, which:
- In a hot, humid summer tries to cool the inside of the house. This often causes condensation inside the house.
- In a cold, humid winter tries to warm the inside of the house by cooling air outside the house. This sometimes causes condensation outside the house.

[Petrochemicals]

I do not really understand the description but fridges leak water anyway, it is usually drained onto the compressor outside the fridge for evaporation disposal and things called dehumidifiers exist already.