On Wed, 22 Mar 2000, Jeff Hubbs wrote:
> After using laptops wuite a bit over the past year, all else being
> equal, I'd rather have an LCD than a CRT, but I have to agree: the cost
> just ain't worth it! However, I would give myself the following caveat
> to that statement aside from the obvious space consideration: power
> consumption and heat generation.
This is a good point, too. I have measured my computer's actual
consumption (vs. rated) and found it to be 75W with the monitor off, 150W
with it on. This is with a conventional CRT, 14". I measured it in order
to estimate UPS runtime.
I think (and correct me if I am wrong) that the CRT monitors are usually
rated around 10-20W, meaning they would consume closer to 5-10, I would
expect. Watt ratings are usually very liberal to account for start-up
surges.
As for heat generation, from a physics point of view, a computer is a
fancy electric heater. Very close to 100% of the energy consumed exits as
heat. There is a small amount that exits as kinetic (air movement from
the fans) or light (from the monitor). As such, you can actually
calculate the heat generated by converting watts to calories/hr or btu/hr
and estimate any cooling needs for a server room.
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Glenn C. Lasher, Jr - Senior Engineer, Telecommunications/UNIX/Windows NT
Data Tech Associates, Ltd, 883 Broadway, Albany NY, 518.465.1190
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