How to read my posts
ok well i think everyone's referring to this pic
Well i should probably explain what this pic is showing
This is NOT the under side of my block but a cut through the base. I dont show any pic of the Bas of the block because it's pretty boring because after the heat has been spread through the 3mm cooper base the temps are pretty even across it.
So this pic shows the temps 7.1mm below the top of the block or channels . There is still 2.9mm of the base to go before the TEC's touch the block.
7.1mm is 0.1mm lower than the channel depth .. when i change the channel depth the cut is always 0.1mm below the level of the Channel ..
I like this pic because it shoes how well the channels and fins are working and it shows the hot spots nicely
While im explaining these pics this shows the surface temp of the copper block It also includes the TEC's temp in the scale but you can't see it since it's on the back. SO the hottest temp shown on the scale is the max temp on the TEC.
I use this pic to determine which design ultimately cools the load the best
This one shows the total back pressure of the block and it's distribution around it.
These next two show the velocity of the fluid in the channels. The first one is taken 1mm below the top of the channel
The second is taken 1mm from the bottom of the channels
How im testing. I have a 62mm copper block on the bottom of the water block that is producing 800wats of heat evenly across it's surface.
THE most important thing im doing to ensure useful results is im applying a tested flow/ pressure of a mcp 655. This is crucial to getting any kind of useful results. This enables me so juggle the compromise between flow rates and back pressure.
If anyone wants to try this kind of thing you CAN'T just apply a volume of water or a pressure (the default ways) to the inlet and expect to get any kind of useful results.
If you apply a Volume of water a ridiculously restrictive block works the best since the back pressure is unlimited.
If you apply a Pressure of water then a ridiculously UN restrictive block works best because volume is unlimited.
Edited by Ultrasonic2 (muffy) - 7/23/09 at 5:43pm