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Is there a standard for solar?

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Comments

  • #32
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    heinbloed wrote: »
    To rayh:Have you monitored already an entire heating season? Or are these values based on pure calculations? 19m2 flatpanel collectors covering a spaceheating demand of 114kWh/m2/a seems to me to be a very optimistic calculation for the Irish climate, but I'm no heating engineer. Thanks.

    Hi Heinbloed - I don't think the 114kWh/m2/a improvement is just down to the solar panels - Rayh says he did a series of other measures too - can you tell us more about that Rayh ? Significant insulation upgrade i assume ?


  • #33
    rayh
    Registered Users, Registered Users 2 Posts: 153 ✭✭rayh


    I will try to cover some of the issues raised;

    1. I have 6 data loggers (5 inside and I outside) sampling temperatures at 5 minutes intervals since February 2006 coupled with records of all energy inputs.

    2. Insulation upgrade – 400mm Fibre Glass in Attic, Windows and Doors from Single Glazed to U-value 1.4, Full Fill Cavity, 200mm Polyiso in Floors and 75mm centres Underfloor pipe system – Average U-value from 0.79 to 0.26 at an estimated cost €60K.

    3. Solar system only commissioned last Tuesday week and will be supported by 12 kW wood pellet with water heating and hence the low CO2.

    4. Additional monitoring will include solar radiation, energy from solar and energy to space heating – I do not expect to have this additional monitoring operational for a number of weeks


  • #34
    heinbloed
    Registered Users, Registered Users 2 Posts: 1,632 ✭✭✭heinbloed


    Thanks,rayh!That's impressive indeed.


  • #35
    Chimpster
    Closed Accounts Posts: 146 ✭✭Chimpster


    sinnerboy wrote: »
    No choice Chimpster . Got to follow the manual .

    SEI are pretty good at responding to queries . Ask them and let's know how you get on

    Thank you for your e-mail.
    What you have stated (using half of the cylinder – or up to the bottom of the upper coil) is true for a combined cylinder. As per the DEAP manual “in the case of a combined cylinder (such as arrangement b) in Figure H2), the volume of the dedicated solar storage plus 0.3 times the volume of the remainder of the cylinder;”

    If and when the top of the coil is hot due to the boiler rather than the solar coil, the solar coil does not have the ability to heat all of the cylinder. As stated above, some of the remainder of the cylinder is assumed to be part of the dedicated solar storage, but not all of it. Even if the boiler is set using a timer, there is no guarantee that the homeowner will empty the cylinder of “boiler hot water” just before the sun starts to heat the panels.


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