I'm supporting The HUB RiNo Station project (1000100418 - LEED v4 BD+C: CS ). We are pursuing Green Power and Carbon Offsets credit. Currently, I am using the following calculation steps to determine our Total Required Green Power Quantity for this LEED-CS Project.

437,858.80 SF (Exterior Gross Floor Area) - 147,890.92 SF (Parking Areas within building footprint) = 289,968.80 SF (Net Exterior Goss Floor Area)

[289,968.80 SF (Net Exterior Goss Floor Area) - 239,408.12 SF (Usable Are)] / 289,968.80 SF (Net Exterior Goss Floor Area) = .17437 x 100 = 17.44% (Core and Shell square footage)

17.44% (Core and Shell square footage) x 602,651.0 kWh/ year x 5 years = 525,421.27 kWh

AND

17.44% (Core and Shell square footage) x 10,350.9 Therm x 5 years = 9,024.43 Therm

Did we go about calculating core and shell area percentage correctly? Is there an alternative method that would result in a more accurate core and shell area percentage and Total Required Green Power Quantity?

Thanks

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 08/06/2018 - 13:27

Assuming your usable area above equates to the tenant space then you calculations look right to me. Alternatively you can create separate meters within your energy model for the CS area and use that data in your calculations. This would eliminate the percentage calculation and would be more accurate.

Yoyo Shek

Allied Environmental Consultants Limited

LEEDuser Basic Member

3 thumbs up

Mon, 07/06/2020 - 07:13

Hi All, look like the calculation above is using the C&S area % over the overall gross floor area footage times the annual energy consumption to get the Required Green Power Quantity.
And Marcus has pointed out that using separate meters to get the exact energy consumption in the C&S area would be more accurate. However, what if the C&S area is smaller than 15% (say 10%)? I should ...
(1) use 15% of the whole building energy consumption for calculation Or
(2) use the energy consumpted in the C&S area obtained from the separate meter in the energy model plus 5% of the energy consumption in the leased area?
Thanks.

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 07/06/2020 - 14:38

1 would definitaly be acceptable. 2 would also assuming the separate meter showed 10%. The method you propose for 2 is mixing up different percentages. So I am not sure about that one.

Yoyo Shek

Allied Environmental Consultants Limited

LEEDuser Basic Member

3 thumbs up

Wed, 07/08/2020 - 06:27

Thanks Marcus. The reason why I am asking this is that I am having a Data Centre project where the data halls will be leased. The energy consumption in the data halls is expected to be significantly larger than the non-leased spaces (common area like corridor and receiption). Maybe I should discuss with the LEED coach in an appropiate time. Will be sure to post back here if there are any different interpretation.

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Wed, 07/08/2020 - 16:26

Makes sense. I would meter the core spaces speparatly in the model. I would then try to argue that you should be providing the actual consumption of that area instead of the 15% because it is so high an energy use in the tenant spaces.

Linh Dang

LEEDuser Basic Member

0 thumbs up

Mon, 10/24/2022 - 08:02

Dear Josie, May i ask you a question? Is the Usable Area the rental area? Thanks

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