The PC industry has tons of watercooling stuff for use around
electronics, but I haven't found a resource on how much heat the various
sized radiators will transfer. As others have pointed out, I'll need to
dissipate around 5000 btu/hr. Doing some math, 5000 btu=1,260,000
calories. If I assume a 50 C rise (22C ambient to 75C), then
1,260,000/50=25,200 grams raised by 50C. That is about 888 ounces or 7
gallons of water.
A good 120mm computer fan such as by Noctua, will deliver 59 cfm.
Radiators are available that mount 4 of these fans. How do we determine
if that will exhaust enough heat?
Another way to do this is using a hydronic kick space heater. A 4"x19"
unit with fan is about $180, and will exhaust 3300-10360 btu/hr
depending on fan speed. The flow rate is 1-3 gpm. I have a similar unit
in my home hydronic heat system, and it has been running during heating
season (Nov-Apr) for over 20 years without a problem.
Second question: What size copper cooling block would be needed to
remove the heat from 2 BLF188XRs? And how to mill the channels for best
heat exchange into the coolant?
John NI0K
Roger (K8RI) <mailto:k8ri@rogerhalstead.com>
Friday, February 17, 2017 11:53 AM
Water is far easier to clean up, leaves less mess, and is more
efficient at heat transfer. The vapor phase cooling used in computer
CPU cooling is efficient, but less tolerant of leaks, difficult to
charge, and works at lower temps..
Vapor phase water cooling is very efficient (already covered by
another poster) for tubes as vaporizing 1 gram (1 cc) of water uses
539 calories (at 100 C - too hot for SS), while heating or cooling
water 1 deg C takes 1 calorie.
Vapor phase cooling has no moving parts except for a fan(s) at the
radiator.
73, Roger (K8RI)
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Joe <mailto:nss@mwt.net>
Friday, February 17, 2017 9:04 AM
How about instead of "Water" use Mineral or transformer oil?
Less chance of contamination...
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
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Chris Wilson <mailto:chris@chriswilson.tv>
Friday, February 17, 2017 9:01 AM
Hello John,
On Wednesday, February 15, 2017, you wrote:
I'm in the planning stages of a solid state amp. I am considering water
cooling... looking for pointers on design ideas, parts suggestions, etc.
73, John NI0K
http://www.pe1rki.com/watercooling.html has some nice water cooled
heat sinks, and machines nice copper spreader plates if you don't have
access to a milling machine
John Simmons <mailto:jasimmons@pinewooddata.com>
Tuesday, February 14, 2017 7:04 PM
I'm in the planning stages of a solid state amp. I am considering
water cooling... looking for pointers on design ideas, parts
suggestions, etc.
73, John NI0K
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