LPD

Only the area being illuminated. Otherwise the Baseline value would be huge and not in alignment with the Proposed.

Facade is under non-tradable surface, It mean Baseline value should be same as proposed case. so why we have to calculate the LPD for Building facade in baseline. Isn't it baseline Wattage should be same as actual design.

Please suggest if i am wrong.

Thank you
Anil Bhari

Correct they should be identical in the energy models.

The baseline LPD would be calculated for code compliance as this is a mandatory provision. So you do need to calculate the baseline exterior LPD in order to affirm that you comply with this mandatory provision.

Hi everyone,

If a facade is partially illuminated and contains a curtain wall that is not directly illuminated but belongs to that facade, should we include the curtain wall area in the calculation?

Thanks

Only the area being illuminated counts.

However, I am still not so sure about it. The ASHRAE 90.1 Users manual declares explicitly: 
If any portion of the facade is illuminated, the allowance is the entire facade area.

I believe that includes from the bottom to the top of the facade including the curtain wall area.

Can anybody bring some clarity here?

Thanks

Lighting design team should have a COMCheck that covers interior and exterior lighting. I use the facade areas from that.

As indicated in the rest of the thread above, it doesn't really matter. As a non-tradable surface the baseline wattage is identical to the proposed. It only matters for compliance with the mandatory provision. If only a part of the entire facade is illuminated then the issue of compliance is not likely to be in question.

See example 9-O from the ASHRAE 90.1-2010 user manual.  The entire area of a lit facade is used for the allowance, but as Marcus said, because it is non-tradeable, the baseline and proposed wattage will be the same in the energy model.