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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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    • CommentAuthorwookey
    • CommentTimeApr 13th 2019 edited
    PHPP has a slot for an 'exterior door' (on the areas sheet). But a lot of buildings have more than one exterior door. It's not clear to me how to deal with the other one. What does one normally do about this; add a row there for a 2nd exterior door, and hope that ading a row doesn't bugger anything up (dangerous game in a spreadsheet this complicated).

    I can put it in the windows sheet (and this door is a UPVC, mostly-glazed door so modelling it as a window is generally just fine), except that it goes into an unheated, but internal, area so it's not in an exterior wall, which all the other windows are. Or at least it is an exterior wall for the purpose of PHPP, but the outside temp is 'X', not 'A'. So I've currently put the door into it's own area with tempzone 'X' (which there is a space for already in 'areas').

    This worked fine on PHPP 2007 (v1.0), but things have got more complicated by PHPP2015(v9.3) and entering an area element which is only in a group, but does not also refer to a selected item from the U-values sheet seems to be broken.

    This seems like a common-enough circumstance - how does one normally deal with a 2nd external door? In this case into a lobby-type area.

    I have more PHPP questions after messing with it for way too many hours, but this will do for now :-)
    • CommentTimeApr 13th 2019 edited
    I thought I'd have a look at ours to see if I could help, but it's just left me more confused as well :(

    Ours is PHPP v7.1

    The Areas sheet has a row labelled Exterior Door in the summary. It also has another row with the same title in the Area Input section. That has user entry fields for Quantity, the various dimensions and the U-value. The quantity is 2, which confuses me since we have a front door to the outside, a side door to an unheated space called 'bin store' and another side door to the unheated sun room/conservatory. The wall between the house and conservatory is a special zone 'X'.

    The Windows sheet lists those three doors as well as our patio door. The conservatory door is assigned to the special X group and that has a reduction factor of 75% assigned in the Areas sheet. So I assume the 2 outside doors are the other two, which are assigned to group 8 'Exterior Wall - Ambient'. The X 'Ex. Wall to conservatory' group includes the wall areas between the house and conservatory, as well as the door.

    The wall that includes the door into the bin store is part of group 8. So I think the bin store is entirely disregarded for PHPP, despite obviously being a few degrees warmer than the real outside.

    So maybe I'm not so confused now. If your door goes to somewhere that is a separate temperature zone, then it's not external but it is part of the wall that surrounds it that effectively defines the temperature zone. Both that and the wall that includes the bin store door are referred to the 'straw bale walls' U-value item.

    Hope that makes some sense and helps.
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