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

["Varkie Thomas" <Varkie.Thomas@xxxxxxx>]

Title: DOE2.1E questions

Thanks for your helpful response.. 

 

At the moment we analyze buildings during the schematic phase of the project to compare envelope, systems & plant alternatives.  So we don't go into the details that you describe but we might have to in the future to show compliance with energy conservation codes before submitting construction documents.  We model hotels the way architects design it during the schematic phase with modifications to eliminate the details but keeping the design intent intact.  This means the different space types (meeting rooms, gymnasiums, indoor swimming pools, laudry, restaurants, lobbies, etc.) and area configurations requiring different design criteria and systems requirements are maintained.  There is no problem using DOE2.1E for hotels since the rooms are served by FCUs  or induction units with heating and cooling coils.  In the case of FCUs the outdoor air is supplied to the corridor and transferred to the room.  There is only one exhaust system in a hotel for the bathroom which can be modelled in DOE2.1E.  So DOE2.1E can handle hotels.  In the case of high rise apartment buildings there can be 3 exhaust systems (bathroom, kitchen & dryer) with different air quantities and operating schedules.  At the moment we have to treat the exhaust systems as one system and use the weighted average values of the operating profile fractions. 

 

We also have a solution for dealing with the other issues that I raised.  They were (1) varying the outdoor air based on occupancy (using CO2 sensors) independently of the supply air in a VAV system and (2) under-floor air distribution versus ceiling air distribution.  I was interested in finding out how others handled these situations.  DOE2.1E also does not allow duplicate systems using the LIKE/EXCEPT keywords.  This is awkward when dealing with floor by floor airhanding units in a high-rise buildings with two or more units per floor and served by one or more separate outdoor air handling units

 

Thanks again for your response.

 

Varkie

-----Original Message-----
From: Aulbach, John [mailto:JAulbach@xxxxxxxxxxxxxxxxxxx]
Sent: Tuesday, August 27, 2002 3:15 PM
To: Bldg-sim@xxxxxxxx
Subject: [Bldg-sim] Apartment/hotel DOE-2.1E systems.

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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