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IAQ Optimized at J. Erik Jonsson Central Library in Dallas, TX

The city of Dallas, TX, which owns the J. Erik Jonsson Central Library, set out on a plan to optimize IAQ and reduce maintenance costs. Further, the city wanted clean indoor air to protect the library contents in an urban environment and wanted to replace out-dated electronic air cleaners and rolled-media filters that were installed when the building opened in 1982.

In addition, the owners desired energy efficiency by maintaining low static pressures. Dynamic Air Quality Solutions’ 1-in. V-Bank Air Cleaners were installed in 17 AHUs in 2009.

Overall IEQ was measured in 2011 using an Aircuity Optima building optimization system. The report indicated that the building achieved 100 out of a possible 100 points in both the air cleanliness index and the building pollutants index. Scores of 50 or higher indicate building performance at or above accepted guidelines. In this case, a building performance index of 78 means that 78% of all tested buildings scored at or below this level.

According to the Mechanical Contractor, Metco Engineering Inc., the library valued the improvement in the IAQ after the air cleaners were installed. In addition, the 24-V power input and the longer filter-maintenance intervals enhanced performance.

“The filters’ performance greatly exceeded our expectations,” said Jesse Dillard, P.E., Energy Manager—City of Dallas. “Our staff spent 1.5 days changing the old filters every month. We went to change the new filters after nine months, and found them only 50% depleted.”

Longer filter-maintenance intervals are also translating into additional operational savings in ordering, material handling, labor and disposal costs.

Key parameters
• Type of Facility: Existing
• Function: Public Library (Government)
• Area: Eight Stories, 563,000 sq ft

• Owner: City of Dallas, TX
• Engineering: City of Dallas, TX
• Mechanical Contractor: Metco Engineering Inc.
• Facility Contact: Jesse Dillard, P.E.

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