Fridge fans and auto temp control

Discussion in 'Tech/Mech General' started by Inthezone, Aug 12, 2014.

  1. Inthezone

    Inthezone

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    IMG_0689.JPG IMG_0691.JPG Hi All
    Recently we were in Cornwall during the hot weather which was really nice; a down side of it was that the heat 26 -27 degrees Celsius was reducing the effectiveness of the fridge and freezer so I decided to install a couple of fans to reduce the heat build-up behind the fridge. As I am an engineer I firstly wanted to know what the temperature was behind the fridge in the middle of the day with an ambient of 25 degrees so as I have access to instrumentation I did a quick recording and after ten minutes the thermocouple settled out at 39 degrees Celsius just behind the top vent.
    I got hold of a couple of fans which were the largest I could fit in and sourced a temperature switch from eBay (thermistor type) which could be set between -20 and 50 degrees. With a very little effort I made a frame for the fans fitted the switch and wired it through a 2 amp fuse and set the fans to come on at 30 degrees the result is minus 6 in the freezer and 4.5 degrees in the fridge at 26 degrees Celsius.
     
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  2. Inthezone

    Inthezone

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    and this is the switch
     
  3. Inthezone

    Inthezone

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  4. scotjimland

    scotjimland Funster Life Member

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    Just curious.. why did you fit the fans off center ?

    and how did you make such a professional looking frame.. ?
     
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  5. bungy

    bungy Funster

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    same question ref the frame from me as well!!
     
  6. Inthezone

    Inthezone

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    Because I wanted to fit the largest fans into the space I had to fit them off centre to miss the top evaporation pipe, and the frame is 3D printed.
     
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  7. scotjimland

    scotjimland Funster Life Member

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    that explains.. cheers..
     

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