How do i measure electrical power over time ?

[DeepCut]

Thanks TK, excellent detail


Gary.

[DreamThinkBuild]

@All,

While we are on the subject of heating. How many infrared LED's would be needed, running off a Joule Thief/boost converter, to put out 3412 BTUs? 

The LEDs would be placed in a mirrored tube as in this patent configuration:

"#7133604 Infrared air heater with multiple light sources and reflective enclosure"

http://www.freepatentsonline.com/7133604.html

[TinselKoala]

One BTU is 1055 Joules. 3412 BTU, then, is about 3.6 megaJoules.

But again, you will note that heating and cooling systems are rated in BTU/hour, not just BTU. BTU, then, is an energy value, not a power value, and can express, for example, the energy content of a fuel or power source. (BTU/liter for example).

All the power you put into the system will eventually come out as heat.
The IR diodes can be chosen in many power ranges, but let's choose nice fat 100 mW ones.  That's one-tenth of a Joule per second of operation. So your question, again, isn't how "fast" but how "far"...how LONG can you run, say, a bank of 10000 x 100 mW IR LEDs on 3412 BTUs.
10000 x 100 mW = 1000 Watts, or 1000 Joules/second.
An energy store of about 3,600,000 Joules, dissipated at the rate of 1000 Joules per second (that is, 1000 Watts) , will run out in about 3,600 seconds or 60 minutes.

Unless I misplaced a decimal somewhere.

[DeepCut]

I think we should digitize TK's brain, put it in a yottabyte database, add speech synthesis and speech recognition.


Gary.

[fritznien]

if i had known TK was going to answer i would have been happy to let him as he
does it so much better.
fritznien