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

Chris Yates chris at zed-uk.com
Mon Jan 4 02:44:13 PST 2010


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.p
df

 

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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