Hello again! We are finalizing our model for a v3 Core and Shell Building Renovation. Our model is telling us that our process loads are under the requisite 25%, 23.66% to be exact. We would like to know if there is a comprehensive list of process loads so we can determine if we are missing something. For example, should exterior lighting and parking lighting be considered process loads? We currently have them as controlled loads. Our building is currently vacant, so we have used the 90.1 assumptions/defaults for plug loads, etc. because we don't have a specific list of equipment provided by a tenant. We are not using any Exceptional Calculation Methods. Do we need to "force" our model to reflect >25% process loads, or can we explain the minor discrepancy in the same manner I have used in this message? Thank you!

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Thu, 11/14/2013 - 16:54

No do not "force" the project to be at 25%! Exterior lighting and parking lighting are not process. I am not aware of a comprehensive list. It is basically everything that is not regulated by 90.1. So if it does not fall into HVAC, hot water, lighting, or motors then it it process. What is your building type? What loads are expected in the tenant spaces? How have you modeled plug loads? Is there an elevator load (often missed)? You model process as accurately as possible and if you are under 25% that is fine, just explain how you modeled process and why you are under 25%.

Brian Salazar

President, LEED AP, WELL AP

Entegra Development & Investment, LLC

LEEDuser Premium Member

43 thumbs up

Thu, 11/14/2013 - 17:11

Thanks Marcus It's a plain vanilla, 2 story, 64000 SF vacant office building. Existing building, not ground-up. We did include the elevator as process. Here are the loads we are modeling: Interior Lighting Space Heating (Elec) Space Heating (Gas) Space Cooling Pumps Fans - Interior Receptacle Equipment (PROCESS) Elevator (PROCESS) Parking Lights Sevice Water Heating (Gas) Power Exhaust Fan

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Thu, 11/14/2013 - 17:48

Looks right to me. Are you using a W/area value to model plug loads? If so in your explanation cite the source you used.

Brian Salazar

President, LEED AP, WELL AP

Entegra Development & Investment, LLC

LEEDuser Premium Member

43 thumbs up

Thu, 11/14/2013 - 18:05

Yes, about 2.2 W/SF. This is the worst case, assuming a high density of equipment with little diversity.

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Thu, 11/14/2013 - 18:37

Yep that is a very high number. Any particular reason to use such a high value in the absence of knowing the actual value? If you look in the 90.1 User's Manual Table G-B the value for a typical office is 0.75 W/sf. Such a high value might be justifiable depending on the likely nature of the tenants. Are we talking stock trading floors or very high data center usage or something else? If you used this value throughout the building in your model I have a very hard time believing that your are under 25%?

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