Table 2-6 Pump Head Correction Factors For Increased Viscosity
15
20
30
40
Solution Wt (Percent)→
0 degrees C
1.12
1.16
1.19
1.23
(30 degrees F)
40 degrees C
1.10
1.12
1.16
1.20
(40 degrees F)
82 degrees C
0.94
0.94
0.94
0.94
(180 degrees F
88 degrees F
0.94
0.94
0.94
0.94
(190 degrees F)
Total Pressure drop = 54 x 1.23 = 66.4 feet of water
2.8.3.4 HORSEPOWER:
BHP
= GPM Solution x Head (feet of solution) x Sp. Gr
3960 x Pump Efficiency
= 232 x 66.4 x 1.06
= 5.97 for 40 percent wt glycol solution
3960 x 0.69*
BHP
= 200 x 40 x 1.00
= 2.89 for water
3960 x .70
* Pump efficiency assumed for the solution is as 0.69. It is reduced only by
1 percent for pump capacity effect.
2.8.3.5 Table 2-7 lists the summary of the results of the example used above.
Table 2-7 Summary Results, Typical Example
Water
Solution {40 percent wt, 0
Items
degrees C (30 degrees F)}
GPM
200.00
232.00
Head, Ft.
40.00
66.40
BHP
2.89
5.97
2.8.3.6 Table 2-8 below lists a summary of correction factors for determining
the glycol solution flow, head and break horsepower.
HVAC DESIGN MANUAL
2-20
HVAC SYSTEMS AND EQUIPMENT
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