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2-40 HP Portable Chillers Chapter 7: Appendix 60 of 70
Evaporator Water Pressure Drop Tables
Note: A recirculation pump is required for flows greater than the maximum or
less than the minimum indicated.
Note: Process flow less than or greater than the flow rates shown below requires
a recirculation pump.
Pressure drops in ΔP, psig and kPa
2 HP 3.5 HP 5 HP 7.5 HP
Flow
Δ P
Flow
Δ P
Flow
Δ P
Flow
Δ P
gpm lpm psig kPa gpm lpm psig kPa gpm lpm psig kPa gpm lpm psig kPa
4.06
15.4
3.5
24.1
8.03
30.4
4.0
27.6
10.0
37.9
1.5
10.5
12.0
45.4
2.3
16.1
6.01
22.8
7.0
48.3
10.00
37.9
6.5
44.8
12.0
45.4
2.2
14.8
16.0
60.6
2.9
20.1
8.02
30.4
11.5
79.3
12.00
45.4
10.0
69.
18.0
68.1
4.7
32.1
20.0
75.7
5.0
34.5
10.00
37.9
18.0
124.1
14.00
53.0
13.0
89.6
24.0
90.8
7.3
50.2
24.0
90.8
6.9
47.4
16.00
60.6
18.0
124.1
28.0
106.0
9.6
65.9
33.0
124.9
12.7
87.8
10 HP 15 HP 20 HP 25 HP
Flow
Δ P
Flow
Δ P
Flow
Δ P
Flow
Δ P
gpm lpm psig kPa gpm lpm psig kPa gpm lpm psig kPa gpm lpm psig kPa
22.0
83.3
4.7
32.6
30.0
113.6
4.5
31.3
40.0
151.4
4.0
27.6
55.0
208.2
5.5
37.9
30.0
113.6
8.28
57.1
40.0
151.4
7.5
51.7
45.0
170.3
4.0
27.6
58.0
219.5
5.8
40.0
38.0
143.8
12.91
89.0
50.0
189.3
12.4
85.2
50.0
189.3
5.0
34.5
61.0
230.9
6.0
41.4
46.0
174.1
16.77
115.6
60.0
227.1
17.8
122.8
52.0
196.8
6.0
41.4
70.0
264.9
8.5
58.6
50.0
189.3
20.00
137.9
70.0
264.9
24.2
166.6
55.0
208.2
6.5
44.8
30 HP 40 HP
Flow
Δ P
Flow
Δ P
gpm lpm psig kPa gpm lpm psig kPa
72.0
272.5
6.0
41.1
44.7
169.2
2.0
13.8
75.0
283.9
6.5
44.8
58.5
221.4
3.4
23.4
80.0
302.8
8.0
55.2
70.9
268.3
4.9
33.8
85.0
321.7
9.5
65.5
81.6
308.8
6.3
43.5
105.7
400.0
10.3
71.0
Note: These pressure drop values are valid for single- and no-pump portable
chillers.
Calculating Chiller Nominal Flow and Pressure to Process
• Flow rate: Obtain the flow reading from the appropriate pump curve.
• Pressure: Obtain a corresponding pressure reading from the pump curve you selected,
then subtract the one-pump pressure drop listed in the above table using the
appropriate chiller hp and flow rate.
• For two-pump (Process/Recirc) chillers, do not subtract pressure drop from table above
for process pump.