FAQs about EAp2 :

Can the Passive House Planning Package (PHPP) be used to energy model for LEED?

Is it acceptable to model a split-type AC with inverter technology compressor as a heat pump, like modeling VRF?

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Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

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Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?

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How commonly are the 90.1 mandatory compliance forms submitted as part of EAp2/EAc1?

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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

G3.1.1 | Exception b (40 equivalent full-load hours per week)

From what I could see in related posts, "40 equivalent full-load hours per week" are plainly interpreted as 40 working hours and without any connection to thermal load and I am not sure why is that and what does the above exception actually means. Detailed explanation would be much appreciated to understand this as I couldn't find any definition on that in 90.1.

To give a proper context to as why I am confused: I have a retail core and shell project where the space is predominantly used as Retail-Sales (shops) with working hours Mon-Sun 10:00-22:00 with System 7 as baseline system per each floor, and then there is an office section and cinema theater with different working hours (Office | Mon-Fri 08:00-16:00; Cinema | Mon-Sun 15:00-01:00). Now, both of these space type schedules differ significantly from the main building use according to the already given interpretation where the exception is 40 working hours per week and that I should use separate System 3 for the baseline HVAC system. I assume I got this right, but I would still like to know why "40 equivalent full-load hours per week" is interpreted as 40 work hours per week. Also, the whole second sentence of exception b is not clear enough, not just the equivalent hours. Thank you!

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Mon, 04/01/2019 - 13:22

I full load hour is simply an hour when the facility, or portion of the facility is in full use. If portions of the facility differ in usage patterns, then it often makes sense to have them on their own HVAC system so you do not have to operate the whole facility's HVAC system to condition a small portion of the facility.

Mon, 04/01/2019 - 13:39

Thanks Marcus.

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