 This scares me abit
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Ash Small
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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
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You want the coldest air at the hottest part of the tube (or the part of the tube that needs to be cooled most)
What diameter/length are the pins
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Martin King
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Registered Member #3040
Joined: Tue Jul 27 2010, 03:15PM
Location: South of London. UK
Posts: 237
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ubuntupokemoninc wrote ...
what if i blew the air threw it instead of sucking?
There is a theory that fans are more efficient sucking than they are blowing, but then again I've seen theories that blowing fans are more efficient  SO considering the cost/availability of the tube, have one fan blowing cold air at it and another one sucking the hot air away. This also gives you a certain amount of redundancy in the event of fan failure. I would probably also add fan failure and temperature monitoring and interlock that to the power supply. Note that it's possible to monitor the speed of a non-tacho fan by detecting current spikes on the fans power supply. It might also be worth checking if there's any advantage to "soft starting" the heater to reduce thermal shock (and likewise if the cooling fails then ramp the heater down rather than killing power to it instantly) ? If I was buying one of those tubes I think I would want to protect it as much as possible!
Martin.
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