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In Conclusion
This Engineers Newsletter attempts to show how ASHRAE Standard
62-1989 impacts ventilation system design by applying four different
HVAC scenarios in a similar building setting: A single-space,
constant-volume system; a four-space, constant-volume/makeup-air
system; a multiple-space, constant-volume system; and a multiple-space
variable-air-volume system. As these simple examples demonstrated,
the method of ventilation air delivery ultimately determines
how much outdoor air must be provided for adequate ventilation.
Along the way, we reviewed the difference between designing a
Standard 62-compliant ventilation system for single-versus multiple-space
applications. The latter requires an additional... and, for a
VAV system, iterative... design step: Coordinating the minimum
space and system outdoor airflows to assure compliance at all
load conditions.
Fortunately, the standard gives sufficient latitude for creativity
when it comes to ventilation system design, particularly with
respect to ventilation control strategies for multiple-space VAV
systems. The only proviso is that the designer use sound, defensible
logic and adequately document all assumptions and calculations.
Editor's Note: Watch for a discussion of ventilation reset schemes
and how they perform in an upcoming Engineers Newsletter.
By Dennis Stanke, applications engineer, and Brenda Bradley,
information designer, Trane.
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