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

["Aulbach, John" <JAulbach@xxxxxxxxxxxxxxxxxxx>]

Title: DOE2.1E questions

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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