# Experiments on an existing pump (A) yield the following BEP data: D A = 10.0 cm, H A = 210

## Question:

Experiments on an existing pump (A) yield the following BEP data: DA = 10.0 cm, HA = 210 cm, V̇A = 1350 cm3/s, ρA = 998.0 kg/m3, ṅA = 1500 rpm, ηpump, A = 87 percent. You are to design a new pump (B) that has the following requirements: ρB = 998.0 kg/m3, HB = 570 cm, and V̇B = 3670 cm3/s. Apply the computer program you developed in Prob. 14–153 to calculate DB (cm), ṅB (rpm), and bhpB (W). Also calculate the pump specific speed. What kind of pump is this (most likely)?

Data from Problem 14–153

Develop a general-purpose computer application (using EES or other software) that employs the affinity laws to design a new pump (B) that is dynamically similar to a given pump (A). The inputs for pump A are diameter, net head, capacity, density, rotational speed, and pump efficiency. The inputs for pump B are density (ρB may differ from ρA), desired net head, and desired capacity. The outputs for pump B are diameter, rotational speed, and required shaft power. Test your program using the following inputs: DA = 5.0 cm, HA = 120 cm, V̇A = 400 cm3/s, ρA = 998.0 kg/m3, ṅA = 1725 rpm, ηpump, A = 81 percent, ρB = 1226 kg/m3, HB = 450 cm, and V̇B = 2400 cm3/s. Verify your results manually.

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