# A coolant (specific gravity = 1.2) is pumped through a heat exchanger and control valve at a nominal (desired) flow

## Question:

A coolant (specific gravity = 1.2) is pumped through a heat exchanger and control valve at a nominal (desired) flow rate of q_{d }= 0.6 m^{3}/min. The total pressure drop over this heat exchanger system (including piping and fittings) is constant at 450 kPa. The pressure drop over the system without the control valve, ΔP_{s}, is proportional to the flow rate squared. Its nominal value at the desired flow rate is ΔP_{sd} = 200 kPa. The control valve is to be designed so that the nominal flow rate is 2/3 of the maximum flow rate when the valve is completely open. Based on this information, what value of the valve coefficient C_{v }should be specified?

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**Related Book For**

## Process Dynamics and Control

**ISBN:** 978-1119385561

4th edition

**Authors:** Dale E. Seborg, Thomas F. Edgar, Duncan A. Mellichamp, Francis J. Doyle

**Question Details**

**9**

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