The answer to this one might be obvious, but I just can’t see it:
EAc4 form says to “Provide numbers that correspond with the information provided in EAp2 and EAc1.3”. So the HVAC electricity use is the electricity part and not the district heating part in EAc1.3. Got that! But the lighting part is to be extracted from EAp2? Problem being that in EAp2 there is only lighting power in Watts. What we need is the electricity usage in kWh. We can’t assume that all lighting is always on during office hours, so what do I do? We have lighting controls (motion and daylight). What are they after? Because it’s 50 % of these two numbers that is the amount of wind power that we need to purchase
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
October 24, 2013 - 9:40 am
It does not say that the lighting should be extracted from EAp2. It says that it should correspond with EAp2. I interpret this to mean that it should be consistent with the values in EAp2. They are after electricity consumption for lighting for this credit. It is the lighting power density for EAp2. So if you have a certain installed lighting power density (including any credit for occupancy sensors) you then apply a schedule including hourly diversity factors to determine the kWh. The daylighting makes it much more complicated. Essentially you will need to calculate the lighting energy usage. If this is too difficult you can always use one of the other options.
Maria Porter
Sustainability specialistSkanska Sweden
268 thumbs up
November 14, 2013 - 4:04 am
We have decided to use the output data for lighting from the energy model used in EAc1.3. Hope this will be ok…