FansPumps Flowrate vs Pressure Drop Given the following 36mm

Fans/Pumps Flowrate vs. Pressure Drop: Given the following 36mm x 36mm performance (?P vs Q ) below, plot the expected air flowrate ( P[inH20] vs. CFM) if two of these fans are put a) in series and b) in parallel.

2) Fans/Pumps Flowrate vs. Pressure Drop: Given the following 36mm x 36mm performance (AP vs Q) below, plot the expected air flowrate PlinH20] vs. CFM) if two of these fans are put a) in series and b) in parallel. Fan Type: Delta FFB03612EHN P (gage) mn3/sec CFM in H20 0.34 0.0 0.26 1.8 0.000849 4.7 0.18 0.00222 6.3 0.16 0.00300 7.4 0.13 0.00349 7.9 0.10 0.00373 8.5 0.06 0.00401 9.4 0.00 0.00443

Solution

a) fans in series.

When the two similar pumps/fans are arranged in series, the volume flow rate is equal to that of a single pump and the pressure raise P is twice that of a single pump. Accoedingly the data are given below.

b) Fans/Pumps in parallel.

When two pumps/fans are arranged in parallel, then the pressure raise will be equal to that of a single pump and the air flow rate will be equal to the twice that of a single pump.

Air flow rate ,Q CFM	Pressure raise P(gauge) ) in H20)
0.0	0.68
1.8	0.52
4.7	0.36
6.3	0.32
7.4	0.26
7.9	0.20
8.5	0.12
9.4	0