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Hello,
I decided to build my own thermal chamber for going below/above ambient. I have chosen to use TECs (for obvious reasons), but I'm having a problem finding a high-enough temperature fan for the upper end of the chamber's temperature range. I wanted a chamber that could get up to 105C, the rating of many caps.
I have a few old CPU heatsinks which would work well to displace the heat from the TECs into/out of the chamber. I have a metal frame from an broken microwave that's sizable enough. I can get insulation. What I need is a fan rated for working at slightly above 105C. Above, because it's going to be attached to a hot heatsink.
I searched all major component distributors. Mouser and newark/avnet don't have a way to select a fan's operating temperature. Digikey has only one option, KFB0612HAFDB (unless you want to buy a million fans or pay >$400 USD on a fan). It's rated to only 100C and, at 60mm in diameter, is a bit small. I was looking for closer to 90mm.
*Now I know* I could just use some resistive wire to do this. But if I'm going to be generating that much of a temperature delta, I thought, "Why not do it more efficiently?" It's going to be an "inside the house" chamber. Any heat it generates will have to be offset by our AC unit, hence my interest in *not* using resistive wire.
I thought maybe an exhaust fan for a stove top, or perhaps something for a furnance would do. I'm just not sure how to look/where to search. Ebay has a lot of listings for high temperature fans, but most are for <75C and you have to look up each datasheet because the listings don't really say what "high temperature" means to the lister.
With the proper wire and PC 3D printer filament I could probably roll my own, but I'm just not in a position to do that.
Thanks!
I decided to build my own thermal chamber for going below/above ambient. I have chosen to use TECs (for obvious reasons), but I'm having a problem finding a high-enough temperature fan for the upper end of the chamber's temperature range. I wanted a chamber that could get up to 105C, the rating of many caps.
I have a few old CPU heatsinks which would work well to displace the heat from the TECs into/out of the chamber. I have a metal frame from an broken microwave that's sizable enough. I can get insulation. What I need is a fan rated for working at slightly above 105C. Above, because it's going to be attached to a hot heatsink.
I searched all major component distributors. Mouser and newark/avnet don't have a way to select a fan's operating temperature. Digikey has only one option, KFB0612HAFDB (unless you want to buy a million fans or pay >$400 USD on a fan). It's rated to only 100C and, at 60mm in diameter, is a bit small. I was looking for closer to 90mm.
*Now I know* I could just use some resistive wire to do this. But if I'm going to be generating that much of a temperature delta, I thought, "Why not do it more efficiently?" It's going to be an "inside the house" chamber. Any heat it generates will have to be offset by our AC unit, hence my interest in *not* using resistive wire.
I thought maybe an exhaust fan for a stove top, or perhaps something for a furnance would do. I'm just not sure how to look/where to search. Ebay has a lot of listings for high temperature fans, but most are for <75C and you have to look up each datasheet because the listings don't really say what "high temperature" means to the lister.
With the proper wire and PC 3D printer filament I could probably roll my own, but I'm just not in a position to do that.
Thanks!
