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FAQ
Page 47
power of the absolute temperatures of the surfaces so this averaged approach would be stretched on
very sunny days when the roof temperature is very high.
16.12 Can an under floor space be modelled ‘enclosed’ if the floor is fully lined to the
underside of the floor framing with fibre cement sheeting or similar (note: no walls
around the under floor space)?
The answer is no, it must have solid walls between the ground and the floor.
16.13 I have a project that has a basement carpark that is completely underground with no
natural ventilation. All ventilation is mechanical. The self closing door is perforated
for air flow.
Model the underfloor space as being enclosed.
16.14 Could you tell me how to treat walls etc in an attic where essentially most walls are
facing the roof cavity except for the dormer windows.
Model the walls as being constructed same way as the roof.
If the walls next to the attic space are uninsulated then you model the wall as if it is an external wall
made of roofing iron and insulated to whatever level the roof is insulated to.
16.15 I have a house that has an attic so there is only external walls around the windows.
Could you please let me know how to enter it so that only those external walls are
showing on the detailed report or if there is anything else that should be done when
entering an attic.
An attic should be treated as a normal room with a sloping ceiling and roof. You can only put windows in
the walls.
16.16 I have a corridor, wet and sleeping area in my 'attic' with 2440 high walls. The other
side of the walls has roof space. The ceiling is flat
If the other side of an occupied attic is a normal roof space then treat the wall as being uninsulated
adjacent to a roof space.
17
Drawing
17.1 How accurate do we need to be? I notice when using smaller snaps that it can be
more difficult to join zones without overlapping.
You should select to constrain the drawing movement to the horizontal and vertical and only remove the
constraint when drawing walls that don't meet at right angles. Then everything is easier to draw and you
won't have problems with overlapping zones.
Don't be obsessed with accuracy in drawing the zones. The performance indicator we use is MJ/m². Say
the zone area is drawn a bit larger than it should be, then the calculated MJ are a bit larger also. So the
ratio MJ/m² will be about the same as if you had drawn it spot on with a slightly smaller MJ and slightly
smaller area. Keep the 50 and100 mm snap to grid for eaves, which require more accuracy, and use the
nudge function if you want even greater accuracy for eaves.
17.2 Is there a way of relocating a building on the background grid?
To move all the zones you have created together at the same time, you use the ALT button when you
are dragging. This is explained in the Editing section of the Manual and Help screen, ie
Holding down the Shift button allows more than one node to be selected.·
Holding down the Ctrl button allows the whole zone to be selected.·
Holding down the Alt button allows all zones on that level to be selected.
Highlighted nodes can be dragged to a new position.
If the whole building is to be moved for the first time, select a node in a zone, select a second node with
the ALT key down and drag. The roof line must be dragged separately.
Q and A - Using the BERS Pro Software
© Holger Willrath Solar Logic 2011