theo-armour
commented
6 years ago @mdengusiak
Building height, m
From ground level up? The issue is that ground level is not a gbXML element or attribute so there is no easy way of calculating the building height. The total height of a building - from it lowest point to its highest point probably can be calulated.
*Ok this is fine lets go for total height
No. Of storeys (above and below ground), -
Number of storeys is easy. Figuring out what stories are above and below ground is not so easy - same issue as previous.
*this is fine If we know how many below and above ground
- what if we read walls at storey, if we have wall below grade then we know is underground
If external shading fins are present on each elevation (true /false) ?
Do we have any models where we know there are fins or overhangs? We need some way to identify that a fin is a special type of shade surface type.
- yes, seems we need separate shade for windows shade rather than surrounding buildings
Passivhaus form factor = surface area / floor area ratio
What surface type should be included in each type of area?
- = total external surface area (external wall, roof, exposed floor, slab on grade etc) / treated floor area
The Heat Loss Form Factor is the ratio of thermal envelope surface area to the treated floor area (TFA). This is effectively the ratio of surface area that can lose heat (the thermal envelope) to the floor area that gets heated (TFA).
In other words, the Heat Loss Form Factor is a useful measure of the compactness of a building. And the more compact a building is, the easier it is to be energy efficient. Conversely, the less compact a building is, the more insulation will be required for the building to be energy efficient.
Total Building Volume, V = m3
This may be a tricky one to calculate. Will probably start by trying to calculate the volume of all the spaces.
External Surface = area m2
wall and roof or just wall? total external surface area SUM (external wall,roof, exposed floor, slab on grade etc)
mdengusiak
@theo-armour Here is first draft for our list. I mentioned SI units but this will be gbMXL units so SI or IP:
Building height, m No. Of storeys (above and below ground), - If external shading fins are present on each elevation (true /false) ? Passivhaus form factor = surface area / floor area ratio Total Building Floor Area, A = m2 Total Building Volume, V = m3 A/V ration = - External Surface = area m2 External Opening = area m2 External Wall = area m2 UndegroundWall = area, m2 SlabonGrade = area, m2 Roof Area = m2 RoofLightArea = m2 ....etc
We will snap to closest 8 orientation: N, E, S, W, NE, SE, NW, SW For each orientation: External Surface = area m2 External Opening = area m2 %Glazing per each orientation = %