electric fan for fridge

Discussion in 'Motorhome Chat' started by davejmobile, Jul 24, 2015.

  1. davejmobile

    davejmobile Funster

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    hi can anyone advise how difficult to electric to back of dometic fridge
     
  2. busby

    busby Funster

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    Simple,,you just screw it with self tappers to the inside of the top fridge vent and then wire it into a 12 volt feed. They work well in hot weather...BUSBY.
     
  3. Hydrocell

    Hydrocell Funster

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    I agree it's easy and it makes a big difference when it's hot.
     
  4. Robert Clark

    Robert Clark Funster Life Member

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    How is the fan switched?
    Is there a thermostat or any control?
    Regards
    Robert
     
  5. Hydrocell

    Hydrocell Funster

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    Just use a small switch to control the fan off and on when needed
     
  6. Dazzlin

    Dazzlin Funster Life Member

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    Leave my two fans on all the time.
    Amps drawn are not noticable and they are almost silent.
     
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  7. jdk62

    jdk62 Funster

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    Does that same apply with a tall Theford Fridge/Freezer?
     
  8. TheBig1

    TheBig1 Funster Life Member

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    adjustable temperature switches are only a couple of pounds. set it to switch on above 20 degrees ambient air temperature

    pick up the 12volt feed from the input to the fridge, not the ignition controlled feed though
     
  9. Robert Clark

    Robert Clark Funster Life Member

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    Are these computer fans ?
     
  10. TheBig1

    TheBig1 Funster Life Member

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    yes but use the better quality ones to avoid them being noisy and to be reliable
     
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  11. Dazzlin

    Dazzlin Funster Life Member

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    You can get them for pence from ebay. I paid a fiver each for tc (thermostatically controlled) which go faster the hotter it is and are virtually silent at night.
     
  12. jenny and mitch

    jenny and mitch Funster

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    Dont suppose you have a link Dazzlin ??
     
  13. goldenline

    goldenline Read Only Funster

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    I bought vento fan from these people www.leader- loisirs.com it is french website but reliable. The cost was 30€ a lot cheaper than in england and easy to fit
     
  14. busby

    busby Funster

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    Thats what i have done,,,big improvement in cooling..warm beer is not good. BUSBY:):)
     
  15. Dazzlin

    Dazzlin Funster Life Member

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    Sorry, just popped into a computer shop we were near at the time.
    Pic below. If it appears upside down your computer is broken:LOL:

    Ps. It's moroccan dust, must clean them soon to restore aerodynamics and reduce amp useage!
     

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  16. Nirvanauk

    Nirvanauk Funster

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    Maybe a daft question but are they extracting hot air from the fridge or blowing the ambient temperature onto the fridge to cool it?
     
  17. Dazzlin

    Dazzlin Funster Life Member

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    Always extract from the top. Blowing in the bottom could blow gas out I am told.
     
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  18. Hydrocell

    Hydrocell Funster

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    All absorption refrigerators systems have ammonia and hydrogen confined within the unit at the back of the fridge.
    at the bottom of the fridge you have the absorber vessel containing these liquids that run to the boiler where the heating elements start to work.
    Heating the weak solution of ammonia and water at the boiler tube, drives it in gaseous form through the boiler tube, carrying the solution to the upper level of the water separator.
    the liquid settles in the water separator and flows into the absorber vessel.
    the ammonia vapor rises into the condenser where it will condense into a liquid.
    the ammonia then flows by gravity into the evaporator. large quantities of hydrogen gas are fed into the evaporator, allowing the ammonia to evaporate at a low pressure and temperature.
    since the ammonia is condensing, the the ammonia vapour pressure drops.
    it will then naturally try to reach a vapour pressure corresponding to the temperature in the absorber coils and will continue to evaporate until that pressure is achieved.
    as the ammonia evaporates, it absorbs heat from the food compartment of the refrigerator.
    So in order for the fridge to work well you'll need to expel the heat and gasses at the top of the unit, this is way there is a top vent, however ambient temperature can have a large effect on the how good your fridge works.
    If the outside temperature rises above 25 digress you need to expel some of the excess heat from the back of the fridge, like wise in the winter the temperature drops below 7 digress you need to pot on your fridge vents.
    Adding a PC fan to the back of the top vet to expel heat in countries like Spain where temperatures can get in the upper 30's can really make a big difference.

    I hope this helps
     
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  19. davejen

    davejen Funster

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    Are they noisier during the day?
    Cheers, Dave(y)
     
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  20. Hydrocell

    Hydrocell Funster

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    Are talking about the fridge or fans
     
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