Dedicated Outdoor Air
Radiant Ceiling Panels
Proof of Concept
PPT Presentations @
LEED Green Building
Email: Dr. Stanley A. Mumma,
Since February 15, 2001
|l Home l
Dedicated Outdoor Air Systems (DOAS) l Environmental
Safety l Radiant Panels l Economic
Considerations l Proof of Concept l Technical
Papers l ASHRAE Presentations l Links l
LEED Green Building l Email l
descriptions are below.
This site seeks to support the 6 points listed below:
1) It is almost impossible to verify that the ASHRAE ventilation standard 62.1-2007 has been met with
an all-air system.
2) Therefore a dedicated outdoor air system (DOAS) is required for verifiable ventilation air distribution.
3) Once the use of DOAS is in place, it is one small step to decouple the space sensible and latent
loads by supplying dry Outdoor Air (OA) at a low (45-50 F) Dew Point Temperature (DPT). This
results in a significant improvement in the Indoor Air Quality (IAQ), with a potential savings to US
businesses of $208 billion/year (in 1996 dollars when the Gross Domestic Product (GDP) was
$8,000 Billion) through reduced medical expenses and lost productivity. (source: LBL)
Note: The US GDP had grown to over $14,454 Billion/yr by the end of the forth quarter 2009.
4) That leaves sensible only cooling for the parallel system since all of the moisture is removed with
the ventilation air, eliminating high humidity conditions.
5) There are many design choices for the parallel space sensible cooling system. At this site, ceiling
radiant cooling panels (CRCP)/chilled ceiling or chilled beams (technologies that are expanding
here in the US, as of 8/9/08) are favored. With the DOAS-Radiant system, contaminants
generated or released in one space are not distributed throughout the building by the HVAC sys.
6) THE BENEFITS OF THIS APPROACH: This mechanical system design concept, when compared
to the conventional all air VAV system, results in lower first and operating costs, provides
superior IAQ and thermal & acoustical comfort, reduces the hazard of a biological or
chemical attack in the building, reduces the required plenum depth, and is easier to
balance and maintain.
The challenge of conforming to ASHRAE Standard 62.1-2007 in an energy efficient manner has led some HVAC practitioners to the conclusion that using dedicated outdoor air systems (DOAS) in conjunction with sensible cooling at terminal units offers the best solution.
To comment on the material on this site please send email to:
Stanley A. Mumma, Ph.D., P.E.
¤Dr. Mumma, ASHRAE Distinguished Fellow and Lecturer, is currently Professor Emeritus, Architectural Engineering Department, College of Engineering at The Pennsylvania State University, University Park, PA..
¤This site was designed by Robert V. Hedman, E.I.T., LEED Certified Professional, & ASHRAE member while an MS Candidate in the Architectural Engineering Department at the Pennsylvania State University.
Environmental Safety section
This section contains information about the strong health and safety benefits of the system, including during chemical and biological events.
Radiant Ceiling Panels section
This section contains information on ceiling radiant cooling panels (CRCP), also referred to as chilled ceilings.
Economic Considerations section
This section contains a first cost and operating cost analysis; for a 6 story office building; utilizing a dedicated outdoor air system (DOAS)-radiant system, with a comparison to a conventional all air VAV system serving the same facility.
Proof of Concept section
This section identifies the Contributors to the project. It also provides links to: The Project Description and System Schematic, The System Control Overview, The Project Goals, and A Virtual Tour.
Technical Papers section
This section contains copies of archival technical papers ASHRAE published papers and technical papers on dedicated outdoor air systems (DOAS) and radiant ceiling panels.
You will need Adobe Acrobat Reader to view these files.
Download a free version of Adobe Acrobat Reader.
PPT Presentations @ ASHRAE
This section contains PowerPoint presentations on dedicated outdoor air systems (DOAS) and radiant ceiling panels.
This section contains links to pages dealing with dedicated outdoor air systems and radiant ceiling panels. They are all worth taking a look at.
LEED Green Building section
This section is intended to explore the potential rating points that the DOAS-radiant mechanical system design could contribute to the overall Green Building rating. The DOAS-radiant system is significant for its energy and environmental benefits.