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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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HW cylinder -- surprising numbers
Now that my heating controller is nearly done I've been using it to collect
data. Some of it is quite surprising, at least to me. We have a ~25 year old 120L HW cylinder with foam insulation. Over a period of 6 hours with no heat input (and just a couple of handwashes) the temperature dropped from 61.5 C to 56.5 C. Measurements have a resolution of 0.1C. According to my calculations that represents a loss of ~2.5 megajoules, which over 6 hours is an average of ~115W. I daresay modern cylinders could do a lot better than this, but somehow I was expecting the losses to be higher. Steve S -- |
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