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   Dedicated Outdoor Air
   Systems (DOAS)

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Meetings
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              Email:    Dr. Stanley A. Mumma,
   Ph.D., P.E

   Updated: 1/24/2014

      

   Since February 15, 2001

 Recent additions (left click on title in blue to read the details)
    * ASHRAE Journal Article Dec. 2013, Incorrect Impressions                 Added 01/24/14
    * Common Errors Found in DOAS Applications/Designs                       Added 10/07/13
    * Observations, Journal Article "VAVR vs. Chilled Beam & DOAS"        Added 06/03/13
    * Dadanco response "VAVR vs Chilled Beam & DOAS"                       Added 06/07/13
    * Chilled Beam Journal Article by Dr. Livchak                                      Added 07/06/12
    * DOAS ATC Considerations:  ASHRAE 2012 Chicago Presentation     Added 01/30/12
    * Consequences: EW always "ON".  ASHRAE Montreal Presentation   Added 07/02/11
    * US DOE Nat'nl Solar H2O Heater Wkshp-30 yrs Later.  PPT              Added 07/02/11
    * Albuquerque ASHRAE "Bldg Pressurization" presentation w/ notes     Added 07/05/10
    * DOAS Enthalpy Wheel Issues.                                                        Added 03/01/10
    * DOAS and Building PressurizationCritical topic!                           Added 03/01/10
    * DOAS helps ASHRAE Hdq Bldg earn LEED Platinum                       Added 10/26/09
    * Contaminant Transport and Filtration Issues with DOAS                    Added 08/10/09
    * Letters added 8/11 30% Surplus OA:  Does It Use More Energy?     Added 07/22/09
  
    * DOE report affirms the DOAS-radiant system's superiority. // Full Report
    * A '98 ASHRAE Best Paper that led to Mumma's passion for DOAS   
    * DOAS SA DPT & DBT Conditions.                                                  
    * DOAS & Humidity Control.                                                              
    * ES article May, 08: Terminal Equip. w/ DOAS. Series vs. Parallel      
    * ES article August, 07:  DOAS and Desiccants.                                
    * ASHRAE Journal, Designing DOAS-Radiant Sys.                             
    * DOAS Design and Operation:  Avoiding Pitfalls.                                 
    * Ceiling Radiant Cooling Panels w/Heat-Conducting Rails                   
    * Role of Economizers in DOAS.                                                       
    * UFAD 1) UFAD Tsunami, 2) Real Wld, 3) ASHRAE, 4) Exper, 5) DOE/NCEMBT.

    * Radiant panel roots:  National Solar Water Heater Workshop Handbook or Video or Pix
 


This site has 10 sections, accessible from the navigator bar at the left. Or use the following links:
Home  l   Dedicated Outdoor Air Systems (DOAS)  l   Environmental Safety  l   Radiant Panels  l   Economic Considerations
Proof of Concept  l   Technical Papers  l   ASHRAE Presentations  l   Links  l   LEED Green Building  l   Email

Section
descriptions are below.
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This site seeks to support the 6 points listed below:


1) It is almost impossible to verify that the ASHRAE ventilation standard 62.1 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 $16,660 Billion/yr by the end of the 2nd quarter 2013.
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 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
.

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The challenge of conforming to ASHRAE Standard 62.1 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.

Site Sections
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Dedicated Outdoor Air Systems (DOAS) section
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This section contains information on dedicated outdoor air systems.

Environmental Safety section
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This section contains information about the strong health and safety benefits of the system, including during chemical and biological events.

Radiant Ceiling Panels section
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This section contains information on ceiling radiant cooling panels (CRCP), also referred to as chilled ceilings.

Economic Considerations section
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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
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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
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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 Meetings
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This section contains PowerPoint presentations on dedicated outdoor air systems (DOAS) and radiant ceiling panels.

Links section
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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
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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.


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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


Dedicated Outdoor Air Systems & Radiant Ceiling Panels
This site maintained by S. A. Mumma ©2001
All Rights Reserved. All material on this site are trademarks or registered trademarks of their respective companies or mark holders and remains their property.
Copyright 2001 Bob Hedman.  
 

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