1 / 21

Evaluating HVAC Performance with Particle Assessment

This case study explores using particle assessment to determine ventilation (HVAC) performance in indoor environments, focusing on filtration efficiency and air quality improvement. The study compares different air quality monitoring tools like particle counters and Air-O-Cells to assess fungal spore levels and airborne particle concentrations. The findings highlight the importance of accurate assessment methods in evaluating HVAC systems for better indoor air quality.

rane
Télécharger la présentation

Evaluating HVAC Performance with Particle Assessment

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Case Study: Using Particle Assessment to Determine Ventilation (HVAC) Performance Harry L. Skalsky PhD DABT Skalsky & Associates 27356 Becedas Mission Viejo, California (949) 855-2363

  2. HISTORY • Industry - Aluminum Powders & Alumina Abrasives (NIOSH/OSHA) • Indoor Air – Allergens and Irritant Dusts (Air-O-Cell etc.) • Hazardous Waste Site – Dust Excursions (Direct Reading Dust Monitors etc.) • Exposure Assessment - Particle Counter, Air-O-Cell, and NIOSH procedures.

  3. Exposure Assessment (November 2001)

  4. HVAC System Evaluation(100% Ambient Air appeared to eliminate a airborne fungal spore problem) • Was HVAC System delivering excess fungal spores to the interior ? Or • Was the “cure”, a fortuitous occurrence ?

  5. HVAC – Primary Filter85% in 3 to 10 micron

  6. HVAC – Final Filter 95% down to 0.3 micron

  7. Collection Equipment • Particle Counter HHPC-6 Laser Particle Counter (six channels 0.3 to >10Fm) • Two Air-O-Cells at 15 lpm. (5 minutes - outside and 10 minutes - indoor hallway)

  8. Supply Duct Monitoring • Balometer – to measure, record and monitor air flow throughout the 30 minute collection time. • Plastic Shroud – to prevent mixing with hallway air. • Collection delay - to allow “flushing” of bag prior to sampling.

  9. Particle/Structure Counts20% versus 100% Outside

  10. Particle Efficiency(System Average by Particle size)

  11. AOC Structure Efficiency(System Average by AOC Category)

  12. Intake Location(day1&2)

  13. Intake Location(day1&2)

  14. Intake Location(day1&2) AOC > 2Fm

  15. Hallway Locations(day1) AOC > 2Fm

  16. Supply Locations(day1) AOC > 2Fm

  17. Supply Locations(day1) AOC > 2Fm

  18. Intake Location(day1&2) AOC – Spores[5 Minute]

  19. Hallway Locations(day1&2) AOC – Spores[10 minute]

  20. Supply Locations(day1&2) AOC – Spores[30 minute]

  21. Conclusions • HVAC Filtration Efficiency can be measured by a variety of different factors • Particle Counters and Air-O-Cells yield very different results in the field. • Paired Air-O-Cell samples yield a high degree of variability both in spore count (3-68%) and particle count (27-68%).

More Related