> Where is this confusion coming from? Are you suggesting there won't be colder water around the data centre?
If a fish is swimming in 24°C water, it can't simultaneously be swimming in 19°C water. Maybe its friend 10 meters away is swimming in 19°C water, but that doesn't help the first fish.
Maybe that fish feels more comfortable in 24°C water, because it needs a certain body temperature to keep its internal processes running (i.e., to not freeze to death), but it cannot harvest energy from the 24°C water, which is what you claimed above. I'm not nitpicking, this is one of the most fundamental and important laws of physics.
If a fish is swimming in 24°C water, it can't simultaneously be swimming in 19°C water. Maybe its friend 10 meters away is swimming in 19°C water, but that doesn't help the first fish.
Maybe that fish feels more comfortable in 24°C water, because it needs a certain body temperature to keep its internal processes running (i.e., to not freeze to death), but it cannot harvest energy from the 24°C water, which is what you claimed above. I'm not nitpicking, this is one of the most fundamental and important laws of physics.