Roughly speaking, both an i7 CPU and a GTX 1070 GPU have power
dissipation ratings 150 watts or less, making them each about an order
of magnitude less than the likely dissipation in the KPA1500. I actually
do like the idea of liquid cooling since it's efficient and flexible if
designed properly, but it uses much more space ... the liquid tubes
alone guarantee that and if you want quiet the radiator is much larger.
I don't think that weight is the real issue here ... space certainly is,
though. Liquid cooling for the KPA1500 would be unrealistic on a
commercial basis for a small amp.
But if you extract the heat via liquid cooling and transfer it to a
large enough fan-cooled heat dissipator with larger and slower running
fans, you can make the noise almost imperceptible. I have liquid CPU
cooling on my desktop computer and I can't even hear the two CPU fans
over the relatively quiet case and power supply fans.
73,
Dave AB7E
On 6/3/2018 6:11 AM, Drew AF2Z wrote:
There are liquid cooling systems available for CPUs and graphics
cards, used by gamers and overclockers. Have no idea how this would
compare to cooling a 1500 watt RF power amplifier but probably more
analogous than an airplane engine.
73,
Drew
AF2Z
On 06/02/18 17:09, Dauer, Edward wrote:
I have been following this thread with interest because I have a
KPA1500 on order, and I have very limited flexibility as to where the
RF deck can go compared to where I will have to sit.
Don's video was very well done and a great help in understanding the
realities.
I know zero about thermodynamics, and so wanted only to say thanks to
everyone who is contributing ideas, and to make but two comments.
First, as to water cooling, I suspect it would be a huge weight
penalty to get the cooling fluid everywhere it needs to be. So far
as I know there is only one reciprocating engine made for aircraft
that has a water jacket. (There might be others nowadays - I haven't
owned an airplane for some years.) The reasons others don't are
reliability, safety, complexity, and - mostly - weight. Second,
isn't this largely a contest-operating issue? I believe we are
still governed by the rule that we may use only that amount of power
necessary for the communication. I contest too, so I'll face the
problem on those occasions, but not for casual ragchews. I plan to
make some graphs of when in terms of time, power, mode and band the
fans on mine kick up a notch, and use it as a general operating
guideline if I need to.
Ted, KN1CBR
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