[Bldg-sim] Apartment/hotel DOE-2.1E systems.

[Aulbach, John]

Always glad to help a fellow Chicagoan. Even though I now live in
California.
 
Back in the days I did energy modeling for Hilton Hotels, I would always
divide the hotel Guest Tower up into several levels of occupancy. Since only
one side of a typical hotel room faces the external (solar/transmission) and
hotels rooms usually have drapes closed, I didn't worry too much about
outdoor fenestration or transmission conditions versus the effect of
internal load and, of course, outside air on the room.
 
I then divided the hotel guest rooms up into three or four (as many as six)
occupied levels, as hotel occupancies are roller coasters of conventions,
holiday periods, and every else in between. I made a group of guest rooms
fully occupied, and a group partially occupied, and a third group lightly
occupied (assuming a three way division).
 
I then chose the FOUR PIPE INDUCTION system for my HVAC. This system allows
for Primary AND Secondary heating and cooling coils. The Primary coils would
temper the outside airflow, and the secondary would attack the combination
of the primary tempered and the induced room air. The Induction ratio became
the ratio of all fan coil airflow (say 500 guest room x 200 CFM/fan coil) to
the total outside air.
 
This is direct ventilation of the guest rooms and/or the corridor are pulled
into the guest room and further treated by the fan coils. And exhaust air is
permitted in this SYSTEM-TYPE.
 
High rise apartment living areas can be handled in the same way. 
 
I thank Bruce Birdsall, one of the original DOE-2 developers at Lawrence
Berkeley Labs  for teaching me this trick.
 
John R. Aulbach, PE, CEM
Project Engineer
Sempra Energy Solutions
555 West Fifth Street
Mail Location 27F3
Los Angeles, CA 90013
Tel: (213) 244-8551 Beeper (888) 520-1051
 

"Sempra Energy Solutions is not the same company as SDG&E/ SoCalGas, the
Utilities.  Sempra Energy Solutions is not regulated by the California
Public Utilities Commission, and you do not have to buy Sempra Energy
Solutions products or services to continue to receive quality regulated
service from the Utilities."  



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