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22 TRG-TRC013-EN
notes
period one
Fan Performance
Let’s assume that the fan from the previous example, delivering 3,500 cfm
[1.65 m
3
/s] at 2.0 in. H
2
O [491 Pa] of static pressure, requires 2.0 hp [1.5 kW] of
input power. At these conditions, the fan’s static efficiency would be:
Static Efficiency
3,500 cfm × 2.0 in. H
2
O
6,362 × 2.0 hp
3,500 cfm × 2.0 in. H
2
O
6,362 × 2.0 hp
SE
SE
=
=
=
=
55%
55%
1.65 m
3
/s × 491 Pa
982 × 1.5 kW
1.65 m
3
/s × 491 Pa
982 × 1.5 kW
SE
SE
=
=
=
=
55%
55%
Figure 33
Static Efficiency (%)
3,500 cfm 2.0 in. H
2
O×
6,362 2.0 hp×
----------------------------------------------------------------
55%==
Static Efficiency (%)
1.65 m
3
/s 491 Pa×
982 1.5 kW×
---------------------------------------------------
55%==