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Viewing 15 posts - 1 through 15 (of 569 total)
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  • in reply to: AAVs and Airtightness #39151
    Nick Grant
    Member

    We seal them and also make sure traps have water in.

    Nick

    in reply to: Open Energy Monitor – Building performance #38942
    Nick Grant
    Member

    Hi Will

    Catching up on forum posts as have been too busy.

    Re boards I always regret having set up the forum with so many boards but if there is a demand then I am sure another board can be created (I no longer do this). Problem is there is always overlap – eg with software and simulation?

    Re OEM I think it is excellent and they are great people but I ran out of time playing with it before I was fully up to speed with what is a developing system. On my long list of things to get back into when I am at a loose end!

    in reply to: So, is this going to be better than Windsave? #38830
    Nick Grant
    Member

    Oh dear, might be time to switch electricity supply companies!

    in reply to: Tips on living in an (almost) passive house #38881
    Nick Grant
    Member

    🙂

    It's a lovely home you have built Tahir and it is interesting to spot so many forum discussions turned into concrete results!

    Nick

    in reply to: Room thermometers #38806
    Nick Grant
    Member

    In terms of measuring floor temperature, this is what it might look like under long wave IR. Area average temp 17.7C.

    in reply to: Roof Windows #38810
    Nick Grant
    Member

    Peter

    PHPP can't change the Ug with roof angle But it does flag up a warning to check the Ug if the glazing is not vertical.

    For standard triple glazing that would be 0.6 U vertical I use about 0.9 in sloped position. As David says you need to consider whether any downdraft of cold radiant will cause comfort problems but modest sized skylights should be fine I think.

    Nick

    in reply to: Room thermometers #38802
    Nick Grant
    Member

    Tahir

    Agree with Alan. If the floor feels warm then it is what I'd call hot! Your floor won't be much above room temp when on so will feel cool to touch. The medium price IR thermometers from Maplin are fine. Resolution good, 0.2C or so and you can 'calibrate' against a surface at room temp.

    Can also check kids for fever at a distance if you suspect they have something you might catch!

    Nick

    in reply to: Passivhaus Design Question #38705
    Nick Grant
    Member

    Worth pointing out that the benefit of mass is modest and that it doesn't 'slow down' the escape of heat as some claim!!

    in reply to: Ψ value calculation software for Mac? #38726
    Nick Grant
    Member

    No, I use Therm, in XP in Parallels on Mac.

    No problem taking screenshots from Mac side and pasting results into XLS.

    Some good resources on Warm's web site and the training is very good.

    http://www.peterwarm.co.uk/resources/downloads/

    Nick

    in reply to: Passivhaus Design Question #38700
    Nick Grant
    Member

    The main target is the space heating of 15kWh/(m2.a) (or 10W/m2 peak heat demand).

    This is calculated according to PHPP with Passivhaus assumptions for gains etc.

    Please see the document claiming the Passivhaus Standard which can be downloaded from the Passivhaus Trust Website.

    There are no prescribed elemental U values except for windows (climate specific) and that is for comfort. However you will need very good U values (0.15 or better in the UK is typical) to meet the target for most building types, especially dwellings.

    The 120kWh/m2 if total primary energy value.

    Same for Carbonlite, I can't help with CSH.

    Nick

    in reply to: MEV #38632
    Nick Grant
    Member

    Bob

    I have emailed you a brochure on vents designed for MEV but have not used them. FrischLuftKomfort might show up in Google.

    Unless Alan or others disagree, I'd be with Mark on pulling the air thru' the fabric, need a few Pa resistance so that wind and stack don't dominate.

    Nick

    in reply to: Built-up EPS foundation tub #38366
    Nick Grant
    Member

    The engineer will specify this to suit.

    Nick

    in reply to: Convincing a Lighting Skeptic #38583
    Nick Grant
    Member

    Hi Toby

    Had the same objections plus aesthetics from a very switched on client some years ago so ended up designing some fittings for the job with a friend, Colin Chetwood, who makes lights. The friend had also been biased against CFLs and linear fluorescents but has now embraced them!

    http://www.colinchetwood.co.uk/section181470.html

    I like T5s (obviously high frequency ballasts) and you can get warm or cool white as well as dim-able. Simple pelmet fittings can be good for ambience but if you need good work lighting then likely to be suspended with mix of down and up light, great for craft work without shadows.

    Nick

    in reply to: Built-up EPS foundation tub #38363
    Nick Grant
    Member

    Did exactly what you describe over 10 years ago based on pencil and paper calcs by structural engineer Alan Pearce in Leominster. Bob Johnston (structural engineer) http://m.bjse.co.uk/ has designed a few of these now as have others. Shouldn't be a problem for any structural engineer.

    Nick Grant
    Member

    5 is the figure in my head but it's a bit academic given all the other variables that ae also important such as eliminating air leakage, driving rain etc.

Viewing 15 posts - 1 through 15 (of 569 total)