Hi Scott:
Under the law of the conservation of energy, all of the energy
going into a product must be accounted for.
Energy is measured in joules.
One joule is one watt-second.
One watt is one joule/second.
All of the watts entering the product must be accounted for.
All of the watts are converted to some other form of energy.
If the product has moving parts, some of the electrical energy
is converted to kinetic energy. (The kinetic energy is ultimately
converted to thermal energy in the friction of the mechanical
system.)
If the product has light output (i.e., LEDs, CRT), some of the
electrical energy is converted to light energy. (This conversion
is very inefficient; very little energy is converted to light
energy.)
If the product has semiconductors and resistors and similar
devices, some of the electrical energy is converted to thermal
energy in those devices.
So, for all practical purposes, all of the electrical energy is
converted to thermal energy.
One watt is 3.41443 BTU/hour.
So, for all practical purposes, the product dissipates 3.41443
BTU/hour/watt.
If your product is disspating 1000 BTU/hour, then its input must
be
1000/3.41433 or 293 watts
The BTU/hour is a function of the input power (watts). If the
input power changes from product to product, then the BTU/hour
must likewise change from product to product.
Best regards,
Rich
-------------------------------------------------------------
Richard Nute Product Safety Engineer
Hewlett-Packard Company Product Regulations Group
AiO Division Tel : +1 619 655 3329
Effective 6/12/99: +1 858 655 3329
16399 West Bernardo Drive FAX : +1 619 655 4979
Effective 6/12/99: +1 858 655 4979
San Diego, California 92127 e-mail: [email protected]
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