IES-VE User Forum

I note from the glazing construction that the frame resistance does not alter whether one uses pvc, steel or whatever from the drop box. Thus I am asking what the drop box does? Plus anyone have a list of the typical resistances for wood, pvc, aluminium theyd care to share. Thanks.

Hi,

Not quite sure how it is used by the user guide says the Frame Type input is only used in UK Part L Compliance testing so that at least gives an explanation why it didn't affect the calculated resistance value

Type: The type of frame material selected from a list. The list includes softwood, hardwood, steel, aluminium, PVC and metal and this is used in UK Part L compliance testing.

Phil

update: the Frame type is used for SAP calcs it seems

Thanks. My issue with it is that the glass U Value is centre pane. However the overall uses the resistance to calculate the overall window u value. Thus a list of the resistances would be useful. For instance if i use pilkington suncool 50/25, they quote centre pane as 1.0 W/m2.k. However we all know that the actual window will likely be around 1.4W/m2.k overall or greater. Thus i nudge the resistance of the frame to achieve this whilst keeping the centre pane value constant. But to be honest i'd like to know the actual resistance and i am damned if i can find them anywhere I will keep looking but maybe i need to find my old materials engineering handbook from my loft.

There must be some resources out there if it's not a value manufacturers can provide?

I had a quick look at the Apache tables doc as this can be a useful reference for much of the VE thermal work but it only gives a section on typical window u-values with/without frames so not quite what you needed this time.

Phil