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Objectives

This course project aims to finish with a comprehensive understanding of VAV and DOAS systems, including topics such as fan performance, VAV terminal units, DOAS fresh air configurations, and related issues. Explore VAV system terms and equations, implement VAV solutions for multiple spaces/zones, and analyze critical spaces. Learn about DOAS strategies, hydronic system selection, winter operation, and more.

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Objectives

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  1. Objectives Finish with fans Learn about DOAS and VAV Project related topics

  2. Fan Performance

  3. Centrifugal fans

  4. Axial Fans

  5. VAV • with no re-heaters • with re-heaters • with fan terminal unis

  6. VAV Example • One system • Multiple Spaces/Zones - VAV box for each space/zone

  7. VAV System Terms & Equations(you can find them in ASHRAE Standard 62) • Fraction of minimum outdoor air in space/zone supply air Xi = VOAi / VSAi • Critical space Space with maximumXi , Z=max(Xi) • Fraction of outdoor air in system supply air X = sum(VOA ) / sum(VSA) • Required Fraction of outdoor air: Y=X/(1+X-Z)

  8. Example Solution

  9. Other Issues Related to VAV • Reheaters • Fan control • Minimum supply air • Occupancy sensors

  10. DOAS System • www.doas.psu.edu

  11. DOAS with multi-split systems Fresh air?

  12. DOAS fresh air configurations

  13. DOAS fresh air configurations

  14. Issues Related to DOAS • Split of sensible and latent load • Selection of hydronic system • Winter vs. summer operation • Winter operation with DX systems (heat pump)

  15. Course Project

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