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From: "Mark Hathaway"
Subject: modeling a water cooling system
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Date: Tue, 22 Oct 2002 20:22:04 +1000
NNTP-Posting-Date: Tue, 22 Oct 2002 06:12:37 EDT
I'm in need of some help in modeling a water cooling system I'm mid way
through designing. The system will be used to cool four audio amplifiers.
see here: http://www.passdiy.com/pdf/sonofzen.pdf
Each amp will have about 700 watts of heat to be dealt with. Water cooling
is the only way, ambient temperatures get too hot in Australia for 1)
comfortable room temperatures with ~3kw of heat and 2)heatsinking to keep
mosfets and resistors in their SOA assuming an ambient temperature of 30-40
deg c is just out of the question, so water cooling it is.
Where I'm stuck is data for how much heat a small car intercooler or motor
bike radiator could move assuming fan forced air with the usual large
computer power supply style fans.
Looking at a commercial heat exchanger example
http://www.thermacore.com/heatex_lahx.htm shows watt/deg c numbers that I'd
never imagined before. Where the data falls down is how much air flow and
water flow is required for such high watt/deg c numbers.
Ideally I'd like to use a decommissioned car intercooler or two (or motor
bike radiator, would like to keep it aluminum). Anyone able to point me to
data or examples of achievable deg/c numbers for such a heat exchanger?
Thanks for your effort,
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