[Bldg-sim] 50% Energy Savings Design for Medium Office Buildings - free resource

[Liu, Bing]

Thank you Bill for posting our recent publication on 50% TSD for Medium Office.  This report has been updated with very minor editorial changes.  The most recent version is available for free download at the following link:

http://www.pnl.gov/main/publications/external/technical_reports/PNNL-19044.pdf


Regarding Chris comments on DOAS, I agree, DOAS has to work with other HVAC equipment to provide full heating and cooling requirement.  So the system we evaluated in the report is DOAS with radiant systems.

Thanks,
Bing
__________________________________________________
Bing Liu P.E., CEM, LEED AP
Senior Research Engineer
Energy and Environment Directorate
Pacific Northwest National Laboratory
902 Battelle Boulevard
P.O. Box 999, MSIN K5-16
Richland, WA  99352 USA
Tel:  509-375-3710
Fax: 509-375-2379
bing.liu at pnl.gov
www.pnl.gov



From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Chris Yates
Sent: Monday, January 04, 2010 2:44 AM
To: 'Bishop, Bill'; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] 50% Energy Savings Design for Medium Office Buildings - free resource

Section 4.4.1 - I don't feel there's enough emphasis on extra zone equipment here. Most DOAS systems will require something like fan coils (European fan coils!) or DX terminal units to meet the full heating and cooling requirements.

In Section 4.4.2:

Radiant system design and application are still in development in the United States, while they are
more widely adopted in Europe. Unlike VAV systems, there is no well established radiant system design.
Building surfaces used in a radiant system can be floors, ceilings, and walls, though the first two are most
commonly applied.  *And chilled beams - maybe a bit complicated to model, especially active beams*

Different radiant surfaces have different heating and cooling capacities. A radiant
floor system has a larger heating capacity than its cooling capacity because radiant floor heating has a
larger heat exchange coefficient between the floor and the space than radiant floor cooling. According to
Babiak et al. (2009), a radiant floor system normally has a maximum heating capacity of about 100 W/ft²
(1075 W/m2) and a maximum cooling capacity of about 40 W/ ft² (430 W/m2). *Er..., how many watts per m2?*

In areas exposed to direct sunlight, the radiant cooling capacity can increase up to 100 W/ ft² (1075 W/m2). However, floor carpets
may reduce the heating and cooling capacity by as much as 50%. In contrast to a radiant floor system, a
radiant ceiling has a maximum heating capacity of about 40 W/ ft² (430 W/m2) and a maximum heating
capacity of about 100 W/ ft² (1075 W/m2) (Babiak et al. 2009). *a maximum _heating_ capacity of 430 W/m2 and a maximum _heating_ capacity of 1075 W/m2, which one shall I choose :$*

*suspended timber floors can be heated but offer lower W/m2 than concrete/ screed systems*
*profiled concrete soffits can offer further cooling advantages*


From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill
Sent: 30 December 2009 15:57
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] 50% Energy Savings Design for Medium Office Buildings - free resource

Hi All,

Just an FYI on a recent publication (Sept. 09) available for free online:

"Technical Support Document: 50% Energy Savings Design Technology Packages for Medium Office Buildings"
http://www.pnl.gov/main/publications/external/technical_reports/PNNL-18774.pdf

I just glanced through it (138 page document - 1.2MB file) but I see a lot of good stuff on efficient design and energy modeling.
Good explanations on modeling baseline and proposed models using ASHRAE Standard 90.1, with specifics on radiant heating and cooling,
DOAS, VAV and many of the ECMs that would typically be considered for an energy-efficient design.

There are lots of tips for EnergyPlus users, since that's what was used for the modeling, but much of the document applies to anyone modeling
ASHRAE 90.1 baselines and subsequent conservation measures.

Cheers,
Bill

William Bishop, EIT, LEED® AP | Pathfinder Engineers & Architects LLP
Mechanical Engineer

134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
www.pathfinder-ea.com
P Please strive to live sustainably.

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