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Meeting Part L

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  • 11-11-2010 5:05pm
    #1
    Wolfhound14
    Registered Users Posts: 100 ✭✭


    I am currently doing a prelim BER and am struggling to meet the Part L, without over specing the solar.

    My plan is to go with a condensing oil bioler with UFH, Solar and a wood burning stove.
    With my proposed setup my assessor is at 9.18kWh/m2.
    The solar spec is for 30 tubes and a 300 litre tank, per the manufacturer.

    I can make it to 10 by upping this to 400L and 40 tubes, but I really think this is overkill. We are a family of 4, with no plans to expand and I don't like spending unnecessary money for no benefit.

    Any other ideas for Part L contribution?


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    #2
    sydthebeat
    Subscribers Posts: 41,644 ✭✭✭✭sydthebeat


    a few q's

    total Floor Area:
    GF area:
    Exposed perimeter
    Elemenetal u values:
    (walls)
    (floors)
    (roofs)
    (windows)

    heating controls:

    expected air tightness result (input 10 if none):


  • Options
    #3
    Wolfhound14
    Registered Users Posts: 100 ✭✭Wolfhound14


    Hi Syd

    Answers:
    267sqm - its a split bungalow, so its all GF
    Not sure what you mean by exposed perimeter, the total perimeter is about 100 linear metres, thats taken from adding all external corners
    Walls - 0.15
    Floor 0.15
    Roof, I have a couple of semi-vaulted areas, these are rigid board planned to 0.18, total of 30sqm, the rest is planned at 0.15 and thats about 250sqm
    Windows - Aluclad avg u 1.2

    Heating Controls: Planning heatmiser programmable stats in each room with a central controller. (Not sure if this answers)

    Air Tight - we have assumed 3. (Is this relevant to Part L? If so I would much rather spend the money trying to get this down than adding unnecessary solar)


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    #4
    sydthebeat
    Subscribers Posts: 41,644 ✭✭✭✭sydthebeat


    those seem like very good values to be inputting and therefore im surprised your struggling to meet part l

    id suggest a few things

    1. definitely do not use the default values for solar collectors, go to the harp database and select a solar tube manufacturer and input their certified data. the default values are very very bad.

    2. heating controls, input full time and temperature zoned control. include for a weather compensator.

    3. check again that you have secondary heating fuel as wood


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    #5
    caesarthechimp
    Closed Accounts Posts: 204 ✭✭caesarthechimp


    sydthebeat wrote: »
    check again that you have secondary heating fuel as wood
    Can normally only do this for a wood pellet stove, ie incapable of burning any other types of solid fuel.


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