Temperature Data for Liquid Cooler
NOTE: You can click on the graph to get a (slightly) bigger version.
Phase II Data
Normal Operation of Liquid Cooler with Peltier
You might be able to see from the graph that the bucket is warming faster than the peltier.
I've managed to dump the heat out of the CPU and into the bucket but I now seem to have a
problem dumping the heat out of the bucket.
Operation With Ice Water
Well, I wasn't getting the CPU as cold as I wanted so I decided to dump a bunch of ice into
the bucket. Starting out with the bucket at 90F was probably not a great idea but whatever.
I was very pleased to get the CPU, a very big heat source, down below freezing!! Now that is
Simulation of Peltier Failure
In the event the peltier looses power I wanted to know what the effect on the system would
be. Although I did chicken out early it is clear that the CPU temperature would not have
risen to critical temperatures. The temperatures are very undesireable but are never the
less short of total melt down. See fan shutdown experiment at the bottom.
Simulation of Water Pump Failure
I was somewhat supprised to find that the failure of the water pump would be catastrophic!
After only a modest increase in CPU temperature the heat exchanger was near meltdown
temperatures. I wasn't able to touch it for more than a second. At these temperatures peltier
failure was certain. If I had planned things a little better I would have put a temperature
sensor on the heat exchanger.
Testing the Cooling Power of my CPU Heatsink and Fan
I wanted to know: 1) What would happen if my CPU fan failed, 2) How much work the fan was
really doing. The temperature sensor was under the CPU as above. I stuck a pencil in the fan
to stop it. I was amazed by the temperature of the CPU without the fan running. Very scary!
Phase I Data
How cold could it go?
I wanted to know what the max delta t I could get out of the peltier was. I quickly found that
ice buildup on the cold plate of the peltier was acting as an insulator and thus was keeping
the peltier from going below freezing. A shot of ice in the bucket shocked the peltier below
freezing but not by much. After covering the cold plate with a fairly dense foam I was
pleased, but a bit supprised, to see the temperature go well below zero.
All images and data Copyright 1998 Larkin Lowrey