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[EnergyPlus_Support] Re: Major Hotel Renovation and ASHRAE 90.1

It's a breath of fresh air to hear about a reduction in win/wall ratio. Yes, I think you should model as per 90.1, and yes I think you will save loads of energy. Something we all know is that energy savings starts with the envelope. I hate having to explain over and over again that a window just isn't as thick as a wall. Even the best 3 ply glass will achive a u-value < 1.

However, check the EBOM userguide for deviations from the 90.1 Standard. They do happen, e.g. LEED guidelines for the treatment of district heat, will have you model a water coil with a system 2 PTAC which is gas-furnace in ASHRAE.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "jvd2pe" <jim@...> wrote:
>
> Dear Forum,
> (Excuse cross-posting!)
> I'm now modeling a hotel which is seeking LEED certification.  The "Executive summary" goes like this:
> * Lower Level and 1st floor are ~25,000 square feet and contain meeting rooms, offices, and Lobby.
> * Floors 2-12 are guest rooms.
> * The building is all-electric, so I'll use Baseline System #2 for guest roms and #4 for the remainder.
> * The pre-renovation structure was ~80% windows in Climate Zone 2A.
> * Post-renovation, the guest rooms floors will be ~45% glass and the remainder will be ~50% windows.
> 
> The part I'm uncertain about is how to model the walls and windows. ASHRAE 90.1 Table G3.1, item 5f says 
> "f. Existing Buildings. For existing building envelopes, the baseline building design shall reflect existing conditions prior to any revisions that are part of the scope of work being evaluated."
> That seems to say that the 80% windows becomes the baseline envelope definition....
> On the other hand, the new design will certainly save a LOT of energy!
> 
> Please let me know your thoughts about:
> a) whether the Baseline walls and windows should be modeled "as original" for their "U" value, SHGF and ....
> b) whether the normal 40% maximum glazing applies to an existing bulding renovation for either the Baseline or Proposed design.
> 
> Thanks in advance!
> I know I'm not the first one to walk this path, but it's the first time I have walked it!
>




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