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Heating and cooling: measure standing losses

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  1.  
    • CommentAuthorjohnnyh
    • CommentTimeMar 5th 2016
     
    Hi to all,

    could anyone give me a method of measuring the losses from my thermal store when not being drawn from please? I have temp sensors at the top, middle(ish) and bottom.
    i have lots of things on my list at the moment and i am wondering if more insulation should be a priority or not so if the figures show that losses are not so serious perhaps i can leave it til i have more time.

    thanks,
    •  
      CommentAuthorSteamyTea
    • CommentTimeMar 6th 2016
     
    Easy
    Heat it up electrically, let it stand, then heat it up again but note the amount of energy that has been used.
  3.  
    What if you can't heat it electrically ?
    •  
      CommentAuthorSteamyTea
    • CommentTimeMar 6th 2016
     
    Then back to first principles.

    Treat it as a 'little house'
    Work out surface area, insulation levels, volume of store and and temperature differences.
    •  
      CommentAuthordjh
    • CommentTimeMar 6th 2016
     
    Heat the tank. Use the temperature readings to work out the quantity of heat in the store. Leave it to stand for a time. Use the temperature readings to work out the quantity of heat in the store again. The difference between the two measures of heat is the loss over that time period. Normalise to a 24 hour period or whatever.
    • CommentAuthorjohnnyh
    • CommentTimeMar 6th 2016
     
    My lowest temp sensor is perhaps 40 cm up from the bottom of the tank, does that complicate things?
    •  
      CommentAuthordjh
    • CommentTimeMar 6th 2016
     
    The answer you get will abviously be approximate and will depend on what assumptions you make for the temperature distribution at points other than your sensors.

    I'd guess that most of the time, the bottom regions is not very hot, so its heat loss won't be very important.

    You might be able to take additional temperature readings at different heights with a thermometer to improve accuracy.

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