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The solution of Equation given below for a constant volume process is also not difficult. The work done in a constant volume process is the product of the volume and the change in pressure.
In addition to gases, Equation 1-45 also applies to liquids. The power requirement for pumps that move incompressible liquids (such as water) can be determined from Equation 1-44. Replacing the volume (V) with the product of the specific volume and the mass yields Equation 1-45.
Taking the time rate of change of both sides of Equation 1-46 determines the power requirements of the pump.
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