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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Data and monitoring: Bathtime Energy Monitoring

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      CommentAuthorSteamyTea
    • CommentTimeOct 16th 2011
     
    Finally got around to measuring how much water the bath uses, I did the shower a while back.
    Bath fills at 19 kg.min^-1
    Filled it for 4 minutes (about half full)
    Temp was 43C (cold from loft tank is 18C today)

    That works out at 76 kg (or lt) and 2.22 kWh of E7 Electric.

    When I shower, I try to keep it to around 3 minutes flow time.
    Flow is 11 kg.min^-1
    Temp during test was 41C (though probably higher than I would normally use) and cold from tank is still 18C.
    Allowing for a 30 second 'warm up' that is 38.5 kg and 1.03 kWh of EDF's finest.

    My water is close to £6.tonne^-1
    E7 around £0.06.kWh^-1

    So financially a bath is £0.46 for water and £0.13 for electric Total £0.59

    Shower is £0.23 for water and £0.06 for electric. Total £0.29

    My lodger can easily have the shower running for 20 minutes.
    Or £1.32 of water and £0.35 electric. Total £1.67

    Makes you think don't it, as a shower goes right down the plughole but a bath contributes a little to space heating (though most gets sucked out by the fan)
    • CommentAuthorCWatters
    • CommentTimeOct 16th 2011 edited
     
    Your water is expensive?

    http://www.water.org.uk/home/resources-and-links/waterfacts/waterprices

    says 1p for 10L or £1 for 1000L=1000kg
    •  
      CommentAuthorDamonHD
    • CommentTimeOct 16th 2011 edited
     
    You want one of these: http://www.shower-save.com/

    And get the lodger to pay for her showers by the minute.

    Rgds

    Damon
    •  
      CommentAuthorSteamyTea
    • CommentTimeOct 16th 2011
     
    Just dug out my old water bill for last year and the rate was £1.6795/m^3 for water, Sewage is £2.8121/m^3, Standing charges are £9.34 and £7.98 respectively.
    3 months or 38 m^3 cost me a total of £182.66. That is £4.81/m^3. If I can find this years bill, and I know it has gone up, I shall update the figures.
    Why do we pay so much for water down in the South West? There are many different answers, geography and infrastructure are probably the main ones, and the need to keep 300 miles of coastline up to a minimum EU standard. I am not complaining about the standards and appreciate that it has to be paid for (central government has mentioned helping out) but it is a problem that inland areas do not fork out for. Each year the static population swells from 600,000 up to I do not know, but do know that we get 5 million visitors a year, or nearly 14,000 a day if distributed evenly over the year. But let us assume that 70% come in the 6 week summer period, that is 3.5m people or an extra 83,300 a day. Our water infrastructure has to cope with that (683,300 people a day) so has to be 14% larger than needs be.
    Not sure what others pay, but is it about 15% less?

    Just been to SW Waters website and seem that the new charges are Water £1.8126 and Sewage £3.0537, Standing charge for a 22mm Water Meter is £34.68 and £29.88 pa respectively.
    So 38 m^3 over a quarter of a year will now be £201.06 or £5.29 m^3. I think there is no VAT on that. So my memory let me down by £0.71 a Cubic Metre.
    Just had another look and seem there is VAT on the meter rental so add another £3.23 a quarter bring it up to £5.38/m^3.
    £0.42/day
    Really amazingly cheap for what it is:wink:
    • CommentAuthorCWatters
    • CommentTimeOct 16th 2011
     
    Ah yes I'd forgotten about the sewerage charge.
    •  
      CommentAuthorSteamyTea
    • CommentTimeOct 16th 2011
     
    costs more then the drinking water
    •  
      CommentAuthorDamonHD
    • CommentTimeOct 16th 2011
     
    Does crunch peanut butter cost more than smooth? %-P

    Rgds

    Damon

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