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Energy cost of a folding computer versus space heater - Page 2

post #11 of 18
well.... whats the surface areas at what temperatures?


say you use a gtx 480? you get a 2 inch square chip at 70c? whats the temperature/ size of its cooler?


how big of surface area does the average space heater use and what temperatures?


my old Pentium D rig i do think really made the room warmer.... i don't think my gulftown gtx460 SLI seems to be as noticeable, though it does have a lot better cooling. so does the cooling make a difference?
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post #12 of 18
Your folding rig and a space heater convert electrical energy into heat energy at exactly the same rate, so for the same heat output, would cost the same to operate.

You won't get that nice toasty warm feeling from your computer you do from most space heaters though, because there no radiant heat transfer from your computer like you get with most heaters.

The radiant heat transfer component from a space heater may make it cost less to operate, for heat, than a computer.
Radiant heat is able to warm you without heating the air between you and the heater, like the sun warms the earth through the cold vacuum of space, which typically will make you comfortable at a lower air temperature, saving you the cost of heating the air to a comfortable temperature.
The computer is only able to heat the air.

Of course this is a meaningless distinction because I don't think anyone is is only using folding as a heat source.
Then again, in 20 years of pushing heat around for a living, I've seen people use some mighty unusual things as a heat source.wink.gif
A light bulb manufacturer in Germany even came up with a way around the EU's ban on incandescent light bulbs by marketing them as "heaters".thumb.gif
Quote:
Originally Posted by robwadeson View Post

My space heater output much more heat than my rigs at the same wattage. Energy is transferred into work done (atomic level). Another example would be that amd cards always run hotter than nvidia cards while consuming less watts. So it all comes down to how efficiently the cpu/gpu silicon is converting energy into work (not in terms of displacement in mechanics).

All electrical devices produce 3.414 BTU of heat per watt of electrical energy consumed.
This is true regardless of if the electricity is being used to switch transistors in a computer chip, create rotating magnetic fields to drive a motor, or make a curly bit of wire glow red hot.

In your AMD vs nvidia cards example, the lower wattage AMD card is producing less heat, but the nvidia GPU runs at a lower temperature because it has a cooler that is able to move heat more efficiently.
Temperature is not the same thing as heat.
Edited by Caleal - 1/29/12 at 2:54pm
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post #13 of 18
Caleal, what do you do for a living? I am just curious based off your responses in different threads. Seem to be pretty scientific.
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post #14 of 18
Quote:
Originally Posted by ramkatral View Post

Caleal, what do you do for a living? I am just curious based off your responses in different threads. Seem to be pretty scientific.

I've been in HVAC/R for 20 years. (Heating, Ventilation, and Air Conditioning/Refrigeration)
I also do some home/building energy consulting and testing.
I'm not an engineer, but I have engineers that call me when they have a problem. wink.gif
Edited by Caleal - 1/29/12 at 3:14pm
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post #15 of 18
Quote:
Originally Posted by Caleal View Post

I've been in HVAC/R for 20 years. (Heating, Ventilation, and Air Conditioning/Refrigeration)
I also do some home/building energy consulting and testing.
I'm not an engineer, but I have engineers that call me when they have a problem. wink.gif

When you know what you are doing that's all that matters. Seems like you were able to answer this question better then anyone else.

If you are looking for something to replace a space heater folding is not the answer. However if you just want to kick the ambient temperature of the room up a couple of degrees throw a computer in there and fold away!
post #16 of 18
Quote:
Originally Posted by crystalhand View Post

When you know what you are doing that's all that matters. Seems like you were able to answer this question better then anyone else.
If you are looking for something to replace a space heater folding is not the answer. However if you just want to kick the ambient temperature of the room up a couple of degrees throw a computer in there and fold away!

This, by no means does your computer work better than a space heater but it does warm my room from <60f to 66f much more comfortable
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post #17 of 18
Quote:
Originally Posted by crystalhand View Post

If you are looking for something to replace a space heater folding is not the answer. However if you just want to kick the ambient temperature of the room up a couple of degrees throw a computer in there and fold away!

My main rig has the exhaust out the top, so in the winter I slide it over under my home office window to break up the slight draft caused by the layer of cooler air falling down from the window. Not having a cold draft at foot level makes the room more comfortable at a lower overall temperature. smile.gif
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post #18 of 18
Thread Starter 
I honestly got the idea from my current rig lol. With the door closed in my small room my rig makes my room pretty darn hot during gaming. But I'm not always gaming. However, I could always be folding wink.gif

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