dertill
2018-06-29 11:56:52
- #1
we might possibly have to use wooden windows, fewer windows blah blah blah... ?!?!?!?
is right! The calculation for compliance with the Energy Saving Ordinance is done according to the reference building method. In this process, your planned house is compared with a building that is identical in volume and orientation, with the same number of windows (of the same size and orientation). The reference building has specific U-values defined in the Energy Saving Ordinance and reference building technology. To comply with the Energy Saving Ordinance, your house must have a total primary energy demand that is equal to or lower than that of the reference building.
If you omit or reduce the size of windows, it has exactly ZERO impact on fulfilling the Energy Saving Ordinance. You can even glaze the entire north side. That will increase your energy demand, but so will the reference building’s, and in the end, it makes no difference.
If the Energy Saving Ordinance is not met in this way, the following remain:
- other windows with better U-values; whether plastic, wood, or aluminum makes no difference, there are all types of construction with Uw-values between 1.2 and 0.6. If you don’t yet have triple glazing with warm edge spacers here, then improve that. Thicker profiles as standard (about 75mm) are usually only needed for KFW 55.
- more insulation / thicker insulation
If the problem is with the wall but the windows exceed the requirements of the Energy Saving Ordinance, even more windows can help!
- building technology: gas condensing boiler? solar? controlled residential ventilation? What is the status here?
- fire the architects