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Originally Posted by Ls7corvete
True....darn you and your test bench.
but still, you want a consistant temp and I am guessing 15c will mess up results as much as 30c will. 3x units will give you some flexibility as they can be in series to drop the power down.
I still think the answer to controlling TECs is to simple control the temp of the hot side. If the cold side loop is getting too cold just stop the pump on the hot side loop. Simple enough, you should be able to rig something up to keep things at 25 easily with a similar concept.
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I was thinking about using a 12VDC pump such as the MCP350 or the C System Mag and using a fan controller to very the speed of the pump. Now that I think about this it might just be cheaper to buy a self controlled chiller.... Even still I think I would do the project.