this post was submitted on 15 Jan 2025
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Interesting thought experiment - is a pc exactly as efficient as a resistive space heater? In a pc some tiny amount of electricity is converted to light and sound and kinetic energy instead of heat. But then again, don't those other forms of energy just eventually just turn back into heat again? Hmmm...
Yes, it all eventually becomes heat, though not all in the room. Some sound escapes, and some light goes through the window or whatever. Those losses are incredibly minor though.
What makes a big difference between a PC and something purpose built as a heater is generally how the air circulates the room. A space heater is going to project it out into the room, baseboard heaters will create a wide convection current. A PC on a desk in the corner will typically just blast hot air at one localised spot on the wall which isn't really ideal for dispersing it throughout the room.
What if I reverse the direction of my fans (in from the backside and out from the front) and point it to face the middle of the room?
I would think actually more efficient because heat is the waste product not the expected product like a stand alone heater. Unless you are specifically running your PC at max just to create heat then just using your PC as intended and gaining "free" heat is a bonus.
You will certainly lose a couple of milliwatts if you have a WiFi antenna on your PC.
The rest will be turned into heat in your room, probably.