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A long time ago I read that there were cow farms that used the temperature of milk to heat water, this reminded me of that type of energy efficiency.
Similar ideas could be heard from various enthusiasts, if it goes to the corporate level, maybe one day we will have a functional system.
Bruh!

This is the weirdest thing I've heard lately.
Milk comes at body temperature so there is little to no heat in it, then once collected and going through the pasteurization process the process itself is a heat exchange, milk gets heated and when chilled the heat extracted from it is used to heat the incoming milk, much like pulling a bottle of water that is too cold on the back of your fridge where the radiator is.
These things have been around since I was little and the design hasn't changed at all.
Besides, at a farm heat is the enemy, with new EU regulations you can get easily away from having people working out in the sun at 40C than by not keeping temperatures inside pens, 26C is a heat stress level.
Now if we talk about energy in the fartbags

, that's a different story..