NNTP-Posting-Date: Tue, 31 Dec 2002 15:10:30 -0600
From: Barry Lennox
Subject: Re: Heater required
Date: Wed, 01 Jan 2003 10:12:28 +1300
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On Mon, 30 Dec 2002 00:34:30 -0500, "Neil"
>Is it possible to SLIGHTLY raise the inner temperature of these units(the
>case is only about 2 feet square) with a fan, and a couple of power
Yes, sure a resistor is a heater (or vice-versa) to many people. I
have seen a couple of similar applications where 6 or 8 WW resistors
were mounted on a piece of expanded/punched alloy to increase the
surface area for heat transfer. Or, a lump of commercial heatsink
extrusion maybe a better alternative. The other used about 10 WW
resistors enclosed in an alloy tube. The selection of resistor
numbers, values, wattage ratings and metal size all depends on the
Delta T and thermal time constants required. It could be calculated or
done by trial and error.
Light bulbs can also be used, but they are more prone to failure
and/or breakage, thus creating a maintenance headache.