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inefficiency, thermodynamics, heating my house - Page 2

post #11 of 28
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Quote:
Originally Posted by dealio View Post
wat

wat

wat
i thought we already got past this in the last thread. what am i missing?
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post #12 of 28
No fancy verbiage here (biologist, not engineer), but Folding @ Home successfully heats my apartment's bedroom and lets me wake up to a nice, warm temperature in the morning.
post #13 of 28
Quote:
Originally Posted by hks85 View Post
im not an engineer, I know more than most when it comes to electronics and thermodynamics but this is Overclock.net so im a dime a dozen. How much light is a computer running boinc really producing? 0.5-1watts worth of LEDs? as for motors, how many fans do you really have?

and the power supply, lets say its got a nice 85% efficiency. so your computer is pulling 1KW (heat, air movement etc.) after the power supply. That's an additional 150watts that your power supply is dumping out.
I mean, it would be really difficult to calculate actual efficiency of a PC since each component has its own efficiency rating. For example, each type of fan will have its own efficiency rating on how it converts electricity into mechanical energy. This goes along w/ the LEDs and every other part that gets power. Tricky, tricky, tricky, and I think beyond the scope of what we really care about.

I find it nice to know that I can use my PC to heat and play games and watch movies, and do work, and everything else!

Quote:
Originally Posted by r31ncarnat3d View Post
No fancy verbiage here (biologist, not engineer), but Folding @ Home successfully heats my apartment's bedroom and lets me wake up to a nice, warm temperature in the morning.
And musky!
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post #14 of 28
Quote:
Originally Posted by hks85 View Post
i thought we already got past this in the last thread. what am i missing?
apparently not as you keep implying computers spend all the energy warming and lighting up your room
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post #15 of 28
Quote:
Originally Posted by dealio View Post
apparently not as you keep implying computers spend all the energy warming and lighting up your room
Well, yes, that is exactly what is happening. Your computer might use the power to move around electric charges at first, but the energy does not magically disappear.
In the end each and every bit of the power used by your computer will be converted into thermal energy, heating up your room. The fraction of power used to light up things via LEDs or cathodes is pretty much negligible compared to the overall power usage of computers.
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post #16 of 28
Quote:
Originally Posted by phal View Post
Well, yes, that is exactly what is happening. Your computer might use the power to move around electric charges at first, but the energy does not magically disappear.
In the end each and every bit of the power used by your computer will be converted into thermal energy, heating up your room. The fraction of power used to light up things via LEDs or cathodes is pretty much negligible compared to the overall power usage of computers.
thermal & mechanical energy (fans, hard drives, optical drives, anything moving)... meaning, out of 100w of power, 75watts may go to the motor and turning it, and the other 25 watts may be converted into heat energy.

also the power draw from your computer isn't static--it's constantly changing depending on the load on your pc...
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post #17 of 28
Quote:
Originally Posted by PeaceMaker View Post
thermal & mechanical energy (fans, hard drives, optical drives, anything moving)... meaning, out of 100w of power, 75watts may go to the motor and turning it, and the other 25 watts may be converted into heat energy.
Mechanical energy turns into thermal energy completely due to friction. If it wouldn't, your fans and hard drives would just continue spinning forever.
That's why hard drives and to a lesser extent fans will heat up.
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post #18 of 28
Derp...derp...dERp....DEEEEEEEEEEEEEEEEERp...derp. ..Der-*breaks* My brain hurts....
 
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post #19 of 28
Quote:
Originally Posted by Lord Xeb View Post
Derp...derp...dERp....DEEEEEEEEEEEEEEEEERp...derp. ..Der-*breaks* My brain hurts....
this.

derpin overload = dont know where to begin = defeat
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post #20 of 28
Quote:
Originally Posted by phal View Post
Mechanical energy turns into thermal energy completely due to friction. If it wouldn't, your fans and hard drives would just continue spinning forever.
That's why hard drives and to a lesser extent fans will heat up.
No.

For example:

A fan converts most of the electricity driving it into kinetic energy when it imparts a change in momentum to the mass of air that it pushes. The resulting change in air temp is negligable.

Could you run a large number of fans to heat your home? I don't think my wife would go for that.

"But honey, conservation of energy says that the kinetic energy of the air will be converted to heat energy via friction and the air temp in the house will be more than 30 soon. Just give it a minute."
    
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