Objectives Finish with fans Learn about DOAS and VAV

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Presentation transcript:

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

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 maximum Xi , 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)

Example Solution Space1 Space 2 Space 3 Space 4 VSA VOA Xi X Z Y

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

DOAS System www.doas.psu.edu

DOAS with multi-split systems Fresh air?

DOAS fresh air configurations

DOAS fresh air configurations

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)

Course Project