That's obviously the way to go, but… Where does the 99% come from?
The theoretical efficiency could almost reach 1 with an infinite tube. In practice I've seen ~80%.
It sounds to me like the 'condenser' is perhaps wrapped around the water intake.
Do we want to heat up the oceans that much though?
I believe the heat is being transferred to the ocean water entering the desalination process, which reduces the energy required for desalination, so no transfer of heat to the ocean itself.