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Objectives

Objectives. Finish with fans Learn about DOAS and VAV Project related topics. Fan Performance. Centrifugal fans. Axial Fans. VAV. with no re-heaters with re-heaters with fan terminal unis. VAV Example. One system Multiple Spaces/Zones - VAV box for each space/zone.

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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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