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
rooms 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 building
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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in all things good for the other.
James,
Building envelopes should reflect existing conditions prior to any revisions per ASHRAE 90.1-2007 Table G3.1.5.f in Baseline Building Performance except for additions and alterations which is covered in paragraph c of the same article.
I wonder if the pre-renovation schedules will also help to save a lot of energy also? Could it be justified?
Kevin Kyte, PE, BEMP, LEED (r) AP
Dear All,
Is it possible to model the effect of ceiling fan on thermal comfort
conditions in Energyplus for hot and dry Indian climates.
Thanks in advance for any suggestions.
Hi,
We recently modeled the effect of ceiling fans by estimating the airflow
(based on rpm, diameter & manufacturer data etc) that the fan would create
and corelating it with the guidelines of ASHRAE 55 for increased airflow.
We used a higher cooling set point to compute the energy savings for fans
following the exact methodology as pointed out by Mr Moore in this thread. The
fan power was added to the model as an equipment load. However, this was
done in DOE2.
--
Regards
Hisham Ahmad
OF course there are newly updated concept for remodeling the ceilings that could be adjustable according to temperature. They have provided the complete interior fit out according to the climate.