Take the 2-minute tour ×
Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. It's 100% free, no registration required.

I am trying with humidity sensors and want to build a simple humidity circuit myself, I already got a USB humidifier dissembled, now I need a dehumidifier.

Can I make a small DIY dehumidifier with old computer cooling fins and fans?

If it is a silly choice, what would you suggest that I can build one from common backyard scraps?

share|improve this question
1  
This is probably more appropriate for electronics.stackexchange.com –  Steven Nov 26 '12 at 3:31
    
How are you going to chill the heat sinks below the dew point so the water can condense? –  Fiasco Labs Nov 26 '12 at 16:25
add comment

closed as off topic by Niall C., Steven, The Evil Greebo, DA01, Chris Cudmore Nov 29 '12 at 19:28

Questions on Home Improvement Stack Exchange are expected to relate to home improvement within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer

up vote 2 down vote accepted

@FiascoLabs brings up the key problem: The cooling fins and fan are good for cooling things that are above ambient temperature, but by themselves they can't cool below ambient temperature.

To dehumidify, you need to cool a surface below the dew point, which presumably is below ambient temperature. You will therefore need refrigeration, or a heat sink that is below the dew point (e.g. an ice bath).

You could pump ice water across the back of your cooling fins to get them below the dew point.

share|improve this answer
    
Exactly - The only time the dew point isn't lower than the ambient temperature is in foggy conditions. –  The Evil Greebo Nov 26 '12 at 17:55
    
I think you have answered the question. And further asking should gets me into electronics or physics, I am accepting this. –  Vicary Nov 28 '12 at 10:10
add comment

Not the answer you're looking for? Browse other questions tagged or ask your own question.