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2-40 HP Portable Chillers Chapter 7: Appendix 61 of 70
Evaporator Flow and Pressure Considerations
Modelc Design flow
Design Δ P
Standard pump power To Process pressure
gpm lpm psig kPa hp kW psi kPa bars
-A, 2 hp 4.6 17.5 4.4 30.4 1 0.746 34.1 235.3 2.4
-A, 3.5 hp 7.9 29.9 4.9 33.7 1 0.746 33.0 227.5 2.3
-A, -R, 5 hp 11.6 43.8 2.0 13.7 1 0.746 34.9 240.8 2.4
-A, -R, 7.5 hp 15.7 59.6 2.8 19.0 1 0.746 32.7 225.7 2.3
-A, -R, 10 hp 23.8 90.1 5.1 35.2 2 1.492 43.4 299.0 3.0
-A, -R, 15 hp 34.9 132.1 6.1 41.8 2 1.492 38.0 262.1 2.6
-A, -R, 20 hp 46.5 175.9 7.1 49.0 5 3.73 54.0 372.3 3.7
-A, -R, 25 hp 57.2 216.4 8.1 55.9 5 3.73 52.0 358.5 3.6
-A, -R, 30 hp 70.2 265.6 10.5 72.4 5 3.73 47.5 327.5 3.3
-R 40 hp 88.6 335.4 8.2 56.5 7.5 5.59 55.0 379.2 3.8
-W 2 hp 5.1 19.1 5.7 39.1 1 0.746 32.9 226.6 2.3
-W 3.5 hp 8.6 32.7 6.0 41.2 1 0.746 31.7 218.5 2.2
-W 5 hp 12.6 47.7 2.3 16.00 1 0.746 34.3 236.2 2.4
-W 7.5 hp 17.0 64.5 3.1 21.4 1 0.746 32.0 220.3 2.2
-W 10 hp 25.7 97.4 6.3 43.3 2 1.492 41.4 285.3 2.9
-W 15 hp 38.1 144.1 7.0 48.1 2 1.492 35.5 244.4 2.4
-W 20 hp 50.4 190.8 8.8 60.3 5 3.73 52.0 358.5 3.6
-W 25 hp 61.7 233.7 9.0 62.1 5 3.73 49.0 337.9 3.4
-W 30 hp 76.2 288.5 10.8 74.1 5 3.73 43.0 296.5 3.0
-W 40 hp 98.4 372.4 8.2 56.5 7.5 5.59 55.0 379.2 3.8
c -A – Air-cooled; -W – Water-cooled; -R – Remote Air-cooled.
Pressure is proportional to flow. Recirculation pump is required for values exceeding
those listed.
Recirculation Pump Specifications
HP Recirc. power Flow Rate
Δ pressure
hp kW gpm lpm psi kPa
5
0.75 0.373 13.0 49.2 2.3 16.0
7.5
0.75 0.373 17.0 64.3 3.1 21.4
10
0.75 0.595 26.0 98.4 6.3 43.3
15
0.75 0.595 38.0 143.8 7.0 48.0
20
2.0 1.492 50.0 189.2 8.8 60.3
25
2.0 1.492 63.0 238.4 9.0 62.0
30
2.0 1.492 76.0 287.6 10.8 74.1
40
3.0 2.238 98.0 370.9 8.2 56.5