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Data and monitoring: Insulating fridge sides to save energy

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    •  
      CommentAuthorDamonHD
    • CommentTimeOct 31st 2011
     
    High-temperature aerogel should do the business, of course... B^>

    Rgds

    Damon

    http://www.theregister.co.uk/2010/11/24/diy_insulation_with_aerogel/
    • CommentAuthorseascape
    • CommentTimeNov 3rd 2011
     
    Very disappointed in results of my 'insulating cooker' experiment!

    Ok, measurement of power used was very basic - just used my meter and cooker is old and was cheap so thermostat may not be very responsive. In the first run, without insulation, it took 15 minutes to get to 230C, put bread in for 40 minutes (turned down to 200C after 10 minutes) took out, put cake in for 30 minutes at 180C - this process used 2 units for a 85 minute run.

    For the second run I put 100mm Kingspan board on each side, fixed tight and 250mm lambswool in the grill space above (gaffer taped the grill control knob, just in case someone decided to make a bacon sandwich). And guess what - results the same as first run. I thought heating up time would be shorter at least. Only difference I could see was that both items were slightly overcooked, so next time will shorten cooking time - see if haybox theory comes into play.
    •  
      CommentAuthorSteamyTea
    • CommentTimeNov 3rd 2011
     
    I suspect that you hit two problems along with the 'rough meter reading':

    1, Large temperature difference for thickness of insulation
    2, Not enough testing time

    Feeling a bit peckish now, any cake left?
    • CommentAuthorseascape
    • CommentTimeNov 3rd 2011
     
    Sorry ST - all gone, tasted and looked like Kingspan!!!!
    •  
      CommentAuthorSteamyTea
    • CommentTimeNov 3rd 2011
     
    Better than what I bake, mine tastes like a bonfire :shamed:
    • CommentAuthorkebabman
    • CommentTimeJul 9th 2012
     
    Hi SteamyTea

    I was wondering about insulating the sides of my fridge and freezer. Our kitchen is quite damp at the moment (damp from the floor and partly man made) and there is condensation forming in a kind of arrow head shape from the bottom of the sides of the appliances up to about 2/3rds up. I thought that I read that you shouldn't put insulation on the outside of freezers as they warm up the seals to keep them from freezing but at the moment there is damp at the bottom edge near to the seal. But I am wondering about trying it out, any thoughts?
    •  
      CommentAuthorSteamyTea
    • CommentTimeJul 9th 2012
     
    My thoughts are give it a go and see.
    All that insulation tends to do (without going to extremes), is slightly shift a temperature point about.
    So say your house is usually at 16°C and your fridge is at 3°C, that is a 13°C temp difference.
    Now imagine that an insulation material had a temperature gradient of 20°C/m.
    Stick 0.05m of insulation on and you could have your house at 17°C and the fridge would not know the difference.
    This is not strictly true as insulation does not have a linear gradient, but you get the idea.

    I suspect that your condensation problem is more to do with the house than the fridge and I would not insulate over the seals.
    I just did the sides of mine as I had a convenient gap there anyway (100mm). I left a gap at the bottom and the top to.

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