ASHRAE Journal- September 2008 - 53

When zoning the ductwork, consider a duct ring around the glazed perimeter of buildings. In this way, the loads can be managed independently of one another. The perimeter ring may be equipped with a duct-mounted heating coil to address the skin losses that are not present within the core of the building. Increasing the primary air temperature to the exterior zone, via this offset during the heating season, allows the ACBs to yield the greatest heating output, without sacrificing internal cooling comfort capability. Although four-pipe ACBs are available, the aforementioned strategy typically requires less capital investment at the cost of individual room temperature control. Manufacturers’ data suggests that increasing the end-of-run operating static pressure from 0.4 in. w.c. to 1.0 in. w.c. (100 Pa to 250 Pa) will increase the active chilled beam capacity by more than 55%, at a fan brake horsepower penalty of only 14.1%.‡ Typical operating static pressures range from 0.3 in. w.c. to 1.2 in. w.c. (75 Pa to 300 Pa) at the pressurization plenum of the beam. This trend would hold true with all active chilled beam manufacturers. While an exhaustive study is not included here, it is reasonably easy to make a case for higher beam plenum pressures as this strategy ultimately requires fewer beams to satisfy the sensible cooling load, and little in terms of a fan energy penalty. A slight increase in the cross-sectional area of the primary air ductwork also helps to mitigate any additional fan power, and could be accomplished with little premium in terms of material or labor. However, the additional static pressure at the beam plenum generally adds more sound pressure to the space. The effect is typically considered inconsequential. Higher frequency acoustic content, which is typical of beams, generally dissipates quickly once the room attenuation effect is factored into the analysis. At 1 in. w.c. (250 Pa), the acoustic signature of a single active chilled beam in a typical room could be as low as 29.5 dBA,§ assuming no other sound sources within the space, and no room attenuation effect. As a result, a small increase in system working pressures would seem to remain essentially innocuous from a perspective of a total systems impact. Supercharging beam applications by considering working static pressures between 0.75 in. w.c. to 1 in. w.c. (185 Pa to 250 Pa) is fundamentally a sound approach from an optimization perspective in terms of first costs. As the sound source for an active chilled beam is the nozzle, and since these sound sources are added logarithmically, once the acoustic signature of a single beam is known, with dozens of nozzles per beam, the acoustic signature of the space is also known (as it relates to the beam’s contribution). Sealant materials and workmanship become important issues with pressurized ductwork. However, smaller ducting typically servicing ACB systems is easier to leak test, particularly when leaks in the duct network are easily identified by a whistling ‡Primary air volume = 4,000 cfm (1887 L/s) at 2.4 in. w.c. (600 Pa) increased to 3.0 in. w.c. (750 Pa). Total sensible capacity increase provided by active chilled beam = 50%. Increase in fan bhp = 14.1%. 15 in. SISW AFPF, 9-blade, Arr.3., CLII. §Acoustic sound pressure levels determined using selection program data from Twa Panel Systems, Inc. (MAC Beam software Ver. 11). www.info.hotims.com/19354-68 September 2008 ASHRAE Journal 53

ASHRAE Journal- September 2008

Table of Contents for the Digital Edition of ASHRAE Journal- September 2008

Section: Contents
Daikin AC (Americas), Inc.
Contents
Section: Commentary
Reliable Controls Co.
Options for Sustainability
Section: Industry News
The Silk Route for Energy
Taco
Solar Thermal Is Unrealized Opportunity
Industry Groups Sue City of Albuquerque
Jaeggi/Guentner Ltd
TABB
Section: Letters
Bryan Steam LLC
Letters
C&D International
Section: Meetings and Shows
Ductmate Industries, Inc.
Meetings and Shows
Florida Solar Energy Center
Section: Feature Articles
Article-Radiant Floor Cooling Systems
Fantech, Inc.
MGM Products
Article-HVAC Design for Sustainable Lab
Article-Mixed Mode Ventilation
Mayekawa Japan
Article-Single- Design Considerations For Active Chilled Beams
Article-Acoustic Design In Green Buildings
Article-Teams, Contracts & BIM
RenewAire LLC
Section: Building Sciences
Ziehl-Abegg Inc
Some Old Lessons Distilled
Section: Washington Report
*ASHRAE Standard and Guidelines & Handbook CD+
*Bock Kaltemaschinen Gmbh
Energy in Federal Buildings
Shortridge Instruments Inc.
Section: Products
Munters Corp., Dehumidification Div.
HVAC&R Product Showplace
Section: Emerging Technologies
Toplighting & Lighting Controls For Commercial Buildings
Section: Special Products
Raypak, Inc.
Fans & Blowers
Vaisala
Section: Classified Ads
Carlyle Compressor Co.
Classified Ads
Greenheck Fan Corp.
Section: Advertising Index
Electro Static Technology
Advertising Index
Conn-Fab
Sapa Extrusions, Inc.
Miura Boilers
Seiho International
Solvay Fluor
Wrightsoft
Acutherm
LG Electronics
Dwyer Instruments
Fulton Companies, The
Belimo Aircontrols USA
Carlyle Compressor Co.
Grundfos Pumps
Chillventa
Idemitsu Lubricants America Corporation
Climatemaster
Knauf Insulation
Ductsox Corp.
NAIMA/NIA
Thybar Corp.
Danfoss Inc.
ASHRAE Standard 62.1
United Metal Products
U.S. Green Building Council
CES Group
Specific Systems, Ltd
Metraflex
Parker Boiler Co.
Reznor
AHR Expo-Chicago
APEX Engineering
Goodway Technologies Corp.
McQuay International
Siemens Energy & Auto.
A-J Manufacturing Co. Inc.
Rotor Source
Petra Engineering Industries Co.
*Alerton
*Mitsubishi
Carnes Co.
Honeywell Analytics Inc.
Anvil
Watt Stopper/Legrand
Extech Instruments Corp.
ASHRAE-High Performance Building Design Professional
Viconics
Schneider Electric
Aggreko
Ebtron
Munters Corp., Dehumidification Div.
ASHRAE Journal- September 2008 - Cover1
ASHRAE Journal- September 2008 - Daikin AC (Americas), Inc.
ASHRAE Journal- September 2008 - 1
ASHRAE Journal- September 2008 - Reliable Controls Co.
ASHRAE Journal- September 2008 - Contents
ASHRAE Journal- September 2008 - Taco
ASHRAE Journal- September 2008 - Options for Sustainability
ASHRAE Journal- September 2008 - The Silk Route for Energy
ASHRAE Journal- September 2008 - TABB
ASHRAE Journal- September 2008 - Bryan Steam LLC
ASHRAE Journal- September 2008 - C&D International
ASHRAE Journal- September 2008 - Ductmate Industries, Inc.
ASHRAE Journal- September 2008 - Florida Solar Energy Center
ASHRAE Journal- September 2008 - Letters
ASHRAE Journal- September 2008 - MGM Products
ASHRAE Journal- September 2008 - Meetings and Shows
ASHRAE Journal- September 2008 - Mayekawa Japan
ASHRAE Journal- September 2008 - Article-Radiant Floor Cooling Systems
ASHRAE Journal- September 2008 - 17
ASHRAE Journal- September 2008 - RenewAire LLC
ASHRAE Journal- September 2008 - Ziehl-Abegg Inc
ASHRAE Journal- September 2008 - 20
ASHRAE Journal- September 2008 - *Bock Kaltemaschinen Gmbh
ASHRAE Journal- September 2008 - Shortridge Instruments Inc.
ASHRAE Journal- September 2008 - Munters Corp., Dehumidification Div.
ASHRAE Journal- September 2008 - Article-HVAC Design for Sustainable Lab
ASHRAE Journal- September 2008 - 25
ASHRAE Journal- September 2008 - 26
ASHRAE Journal- September 2008 - Raypak, Inc.
ASHRAE Journal- September 2008 - Vaisala
ASHRAE Journal- September 2008 - Carlyle Compressor Co.
ASHRAE Journal- September 2008 - Greenheck Fan Corp.
ASHRAE Journal- September 2008 - Electro Static Technology
ASHRAE Journal- September 2008 - Conn-Fab
ASHRAE Journal- September 2008 - Sapa Extrusions, Inc.
ASHRAE Journal- September 2008 - 34
ASHRAE Journal- September 2008 - Miura Boilers
ASHRAE Journal- September 2008 - Article-Mixed Mode Ventilation
ASHRAE Journal- September 2008 - 37
ASHRAE Journal- September 2008 - Seiho International
ASHRAE Journal- September 2008 - Solvay Fluor
ASHRAE Journal- September 2008 - 40
ASHRAE Journal- September 2008 - 41
ASHRAE Journal- September 2008 - Wrightsoft
ASHRAE Journal- September 2008 - Acutherm
ASHRAE Journal- September 2008 - 44
ASHRAE Journal- September 2008 - LG Electronics
ASHRAE Journal- September 2008 - 46
ASHRAE Journal- September 2008 - Dwyer Instruments
ASHRAE Journal- September 2008 - 48
ASHRAE Journal- September 2008 - Fulton Companies, The
ASHRAE Journal- September 2008 - Article-Single- Design Considerations For Active Chilled Beams
ASHRAE Journal- September 2008 - 51
ASHRAE Journal- September 2008 - Belimo Aircontrols USA
ASHRAE Journal- September 2008 - Carlyle Compressor Co.
ASHRAE Journal- September 2008 - 54
ASHRAE Journal- September 2008 - Grundfos Pumps
ASHRAE Journal- September 2008 - 56
ASHRAE Journal- September 2008 - Chillventa
ASHRAE Journal- September 2008 - Idemitsu Lubricants America Corporation
ASHRAE Journal- September 2008 - Climatemaster
ASHRAE Journal- September 2008 - Article-Acoustic Design In Green Buildings
ASHRAE Journal- September 2008 - Knauf Insulation
ASHRAE Journal- September 2008 - Ductsox Corp.
ASHRAE Journal- September 2008 - NAIMA/NIA
ASHRAE Journal- September 2008 - Thybar Corp.
ASHRAE Journal- September 2008 - Danfoss Inc.
ASHRAE Journal- September 2008 - United Metal Products
ASHRAE Journal- September 2008 - U.S. Green Building Council
ASHRAE Journal- September 2008 - CES Group
ASHRAE Journal- September 2008 - Specific Systems, Ltd
ASHRAE Journal- September 2008 - Parker Boiler Co.
ASHRAE Journal- September 2008 - Reznor
ASHRAE Journal- September 2008 - Article-Teams, Contracts & BIM
ASHRAE Journal- September 2008 - AHR Expo-Chicago
ASHRAE Journal- September 2008 - Goodway Technologies Corp.
ASHRAE Journal- September 2008 - McQuay International
ASHRAE Journal- September 2008 - 76
ASHRAE Journal- September 2008 - Siemens Energy & Auto.
ASHRAE Journal- September 2008 - Rotor Source
ASHRAE Journal- September 2008 - Petra Engineering Industries Co.
ASHRAE Journal- September 2008 - 80
ASHRAE Journal- September 2008 - *Mitsubishi
ASHRAE Journal- September 2008 - Some Old Lessons Distilled
ASHRAE Journal- September 2008 - 83
ASHRAE Journal- September 2008 - 84
ASHRAE Journal- September 2008 - Carnes Co.
ASHRAE Journal- September 2008 - 86
ASHRAE Journal- September 2008 - Honeywell Analytics Inc.
ASHRAE Journal- September 2008 - Energy in Federal Buildings
ASHRAE Journal- September 2008 - Anvil
ASHRAE Journal- September 2008 - HVAC&R Product Showplace
ASHRAE Journal- September 2008 - 91
ASHRAE Journal- September 2008 - Toplighting & Lighting Controls For Commercial Buildings
ASHRAE Journal- September 2008 - Watt Stopper/Legrand
ASHRAE Journal- September 2008 - 94
ASHRAE Journal- September 2008 - Extech Instruments Corp.
ASHRAE Journal- September 2008 - ASHRAE-High Performance Building Design Professional
ASHRAE Journal- September 2008 - Viconics
ASHRAE Journal- September 2008 - Fans & Blowers
ASHRAE Journal- September 2008 - Schneider Electric
ASHRAE Journal- September 2008 - 100
ASHRAE Journal- September 2008 - Classified Ads
ASHRAE Journal- September 2008 - Aggreko
ASHRAE Journal- September 2008 - 103
ASHRAE Journal- September 2008 - Advertising Index
ASHRAE Journal- September 2008 - Ebtron
ASHRAE Journal- September 2008 - Munters Corp., Dehumidification Div.
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