The Advanced Variable Air Volume (VAV) System Design Guide is
written for Heating, Ventilation, and Air-Conditioning (HVAC)
designers and focuses on built-up VAV systems in multi-story
commercial office buildings in California.
The Design Guide recommendations include best practices for
airside system design, covering fans, air handlers, ducts, terminal
units, diffusers and controls, with emphasis on getting the air
distribution system components to work together in an integrated
fashion. Key topics critical to optimal VAV design and performance
are addressed in the following chapters: 1) early design issues, 2)
zone issues, 3) VAV box selection, 4) duct design, 5) supply air
temperature reset, 5) fan type, size and control, 6) coils and
filters, and 7) outdoor
air, return air and exhaust air. The intent of the information is
to promote efficient, practical designs that advance standard
practice, achieve cost effective energy savings and can be
implemented using current technology.
This is the second edition of the Design Guide. The original was
published in October 2003 and was developed as part of the
Integrated Energy Systems - Productivity and Building Science
project, a Public Interest Energy Research (PIER) program
administered by the California Energy Commission and managed by the
New Buildings Institute. Development of this second edition was
managed by Pacific Gas & Electric as part of the Energy Design
Resources program.
Highlights of new material in this second edition include:
- Additional guidance for simulating VAV system performance
- Updates for 2005 version of Title 24
- Added cost effectiveness analysis for demand controlled
ventilation
- Guidance on using window switches for integration with natural
ventilation
- Information on stability of VAV box controls at low flow
- Updated guidance on use of electric reheat
- Updated supply air temperature control sequences
- Updated supply air pressure reset control sequences
- More information about dealing with rogue zones
- Updated appendix with DOE2 fan curves
In addition eight new appendices have been added, covering the
following topics:
- VAV box minimum and maximum flows for two manufacturers
- Modeling of different VAV control sequences
- Simulated performance of different VAV controls options
- Modeling guidance for demand control ventilation
The first edition of this design brief was prepared for Energy
Design Resources in 2007. Between January and April of 2010, an
engineering review of this document was conducted to update
passages affected by recent changes in the California Building
Energy Efficiency Standards (Title 24 2008). The original content
creator was not actively involved in this engineering review, and
therefore is not responsible for the updates to the affected
passages.
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