Drawing
and conditioning outside air for heating, cooling and ventilation applications
remains a standard practice for new constructions, refurbished and older
buildings alike. But in order to ensure
occupant safety and comfort, air brought in from the outside must be accurately
measured. Additionally, managing outside
airflow is critical in reaching energy savings goals, and regulations
associated with today’s high-performance buildings.
Why
Measure?
Unlike
other utilities, outdoor air is mandated by code requiring a certain amount of
outdoor air to be delivered to a space. The American Society of Heating, Refrigerating and Air-Conditioning
Engineers (ASHRAE) publishes multiple documents and standards to help
ensure that ventilation health, regulatory, energy, performance, code and other
requirements are met.
ASHRAE regulations include:
ASHRAE 62.1
This is the standard for outdoor air quality and amount of outdoor dilution air brought into a building based on building size, type and occupancy. ASHRAE 62.1 has become the de facto standard for determining the amount of outdoor airflow required for a commercial building. This standard also provides guidance regarding how to balance the need for outdoor air versus the energy cost associated with conditioning that air. While this standard does not directly mandate airflow measurement – measuring airflow is the optimum way to ensure compliance.
ASHRAE 189.1
This standard governs the design and operation of high-performance green buildings. This standard incorporated 62.1 and mandates that airflow be measured and accurate at each system level device. Accuracy is the key; while measuring outdoor air is important, ensuring its accuracy is critical.
ASHRAE 90.1
This is the minimum energy standard defining the minimum energy efficiency requirements for the design and operation of new and existing buildings. While it does not directly mandate outdoor air, this standard relates to the operation and control of ventilation systems as they relate to climate zone, building size, type and so on.
Up next: The consequences of not measuring.
Learn More
For
a more detailed look at this topic, including installation requirements, the
formulas for calculating accuracy and measurements be sure to view the Air
Monitor Corporation free on-line webinar: “Yes You Can Accurately Measure
Outdoor Airflow”.
View
the webinar here: https://www.airmonitor.com/whats-new/