[Bldg-sim] Residential or Nonresidental? And sizing for PTAC units.

Loren Appin lorenappin at gmail.com
Sun Mar 9 00:30:30 PST 2008


Hi All,

I'm modeling a 6 story hotel, and am confused with how I should classify the
building.  The hotel is all guest rooms, and is not really mixed use.  So
according to ASHRAE this seems that it would fall under the residential
category, and I would be using PTAC or PTHP systems.  Under table G3.1.1A it
specifically says hotels are considered residential building types, not just
space types... so I assume I'm correct?   However, would I use a VAV or PSZ
system for areas that are not technically guest rooms, or does this not
matter as a hotel is considered a residential "building type"?


Also, when modeling a PTAC system it appears to me that you would get the
EER information from 6.8.1D using the equation, however, sometimes it my
system summary gives me a peak/capacity of a unit as 30KBtu or even 40 for
one room and I know that PTAC units usually don't go much about 20.  So
would the equation in this table still hold?  Finally, if I am getting
varying capacities for each unit as would be expected, would you suggest
taking an average of all the systems, and then use this capacity as the one
to enter into the equation to get the EER and then apply this EER to all
systems across the board?

Thanks so much for the help!

*Loren Appin*

Energy Engineer

*Silpa Inc.*
s i m p l e  .  s c i e n t i f i c   .   s u s t a i n a b l e

AMERICAS | MIDDLE EAST | INDIA

www.silpa.com | Mob: +971.50.9250895
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