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NC-v4 EAp2:Minimum energy performance

Skylight

Greetings,

We have to model a retailbuilding in Climate zone 5.

The major retail zones of the project have wetical fenestration of about 1%. At the same time they are provided with substational amount of skylights - about 40% of the roof area.

The hifght of these retal zones is about 8 metrs.

The questions is:

Are there any exceptions, which could be applied, so that the Skylights in Baseline model be set to more than 3%, because such a situation (explained above) will be very unfavorable for the Proposed model.

Any advise is highly appreciated.

Thanks.

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Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 08/03/2021 - 20:08

I am not aware of any exceptions that would allow a higher skylight percentage in the baseline model. There is a good reason why it is limited as you are finding out relative to energy use. So perhaps change the proposed design to optimize the skylight area.location.

Wed, 08/04/2021 - 07:47

Hi Marcus, Thanks for the reply. Could you please explain what do you paractically mean by saying "to optimize the skylight area location" Thanks
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 08/04/2021 - 13:28

That should read - to optimize the skylight area and location. In many climate zones skylights will end up increasing overall energy use. There are optimal ranges of "skylighting" area for daylighting and ways to build the skylights to minimize glare, added cooling loads, etc. The optimal toplighting area is usually in the range of 10% window to floor area ratio. Vertical glazing in the roof with good orientation depending upon your design goals often performs much better than horizontal skylights.

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