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LEED unconditioned zones

asked 2018-03-21 10:27:11 -0500

Gio's avatar

updated 2018-03-21 11:12:30 -0500

Hi, I'm modeling a building with 90.1 2007.

I have different unconditioned zones (both heating and cooling ) I do not know how to manage them: 1. Unconditioned roof (unoccupied, with no electric loads and lighting) 2. Small circulation zones (unoccupied, with electric loads but with no lighting) 3. Small stairs zones (unoccupied, with no electric loads but with lighting) 4. Park, with lighting and fans

Appendix G says that: "All conditioned spaces in the proposed design shall be simulated as being both heated and cooled even if no heating or cooling system is to be installed...".

In this case these zones are simply unconditioned: can I simulate them without an HVAC but with an electric load or a lighting system? Should I take some particular precaution? How do I manage them in the Baseline model?

Thank you!

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answered 2018-03-22 09:10:00 -0500

If referring to requirement in Table G3.1 (1. design model) b. - it starts 'All conditioned spaces in the proposed..." Its the zones are truly unconditioned, then just leave it as unconditioned in both models. There are different situations which can make a space a conditioned space. See definition: Space for info

Add equip / light as appropriate to the unconditioned spaces.

There is a LEED interp that allows Heated only spaces/system (System 9 / 10) in LEEDv3/2009. So, this may help if you have this in your model.

Also be sure to check the envelope assemblies between the conditioned & unconditioned zones. They must be treated as exterior envelope (or semi-heated if that applies).

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Hi, thank you for the answer and sorry for the delay. In the definition I found that crawlspaces and parking garages are not enclosed spaces so they are not "unconditioned spaces". What does it imply during modeling these zones? Should I add the system or not?

I have also zones that are "indirectly conditioned spaces". So how do I treat them?

I have difficulties to relate the definition to the modelling methods: is it described somewhere how to model this zone types?

Gio's avatar Gio  ( 2018-04-03 10:15:03 -0500 )edit

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Asked: 2018-03-21 10:27:11 -0500

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Last updated: Mar 22 '18