I'm currently building a custom desk. In this desk I will also build-in a small part with a custom electronic panel to provide power to USB devices.
As my gaming pc generates a lot of heat and the panel will generate some too, I was thinking about doing something with this heat. I read another post on this physics part of stackExchange where they say it isn't efficient and you would need a alot of cold air supply.
As I live in Belgium, most time of the year there is enough of cold air, just outside of my window. Another thing is, it doesn't have to be super efficient. If I could just generate enough current to give power to one or more USB connectors or store it in a battery, I would be happy.
Is it possible to create enough energy for my USB, if I got a hot air flow of 50°C and a cold air reservoir of 0-10°C? Follow up question, is it practically possible?
USB works at 5 Volt at a current from 0.5 to 5 Amps.
Other (possible?) options I found was using thermocells and thermocouples.