Quote:
Originally Posted by glend
Thanks Rowland, mine is for a cold finger setup, although I have a cooler box as well it's not going to get used now that the finger is working. Certainly it will work for a cooler box but perhaps running the TEC through the controller relay is less benefical due to the hysteresis issue as you mentioned.
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Hi Glen. Yes, I was refering to Peter's cooler box.
BTW. I have posted data logged some time ago during the maximum differential test of my set up, having reduced the size and weight of the heat sink. Surprisingly, a 28C reduction vs 36C, not a significant penalty, which illustrates the dynamics of this type of cooling and the effect of excess energy supply.
The data is presented as %power, that is PWM duty cycle vs %cooling of maximum differential. Experience tends to indicate similar performance across these systems. Notably 75% of cooling at 50% pwm duty cycle. The remain 25% requires considerably more effort and time (not logged). The start point is 6C reduction without power, give or take a degree or two or 3.