Page 289 - HVAC Pump Handbook

Rishel_CH10.qxd 21/4/06 6:20 PM Page 286

Basics of Pump Application for HVAC Systems

150
Pump flow–head curves
One pump
40
50 60 Two pumps
40 70 70 75
125 50 60 80
75 84 84
80 87
87
Q 1 –h 1
points 87 87
100 84
84 80 80
Pump head—ft. 75 75 70 75 70

50
Two pumps
System head curves
25
One pump
Q 2 –h 2 points
0
0 500 1000 1500 2000 2500 3000 3500 4000
Pumping system flow—GPM
Figure 10.8 Graphical representation of pump performance calculations.

80

70

60

Pumping system kW 50

40

Transition from
30
one to two pumps
1100 GPM
20
One pump Two pumps
10

0 500 1000 1500 2000 2500 3000
Pumping system flow—GPM
Figure 10.9 kW input curves.

286
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