In this post I want to share you how to calculate ** centrifugal compressor power** since there are so many process engineers are looking for it (and I also don’t know how).

To calculate centrifugal compressor power, we need these gas properties: compressibility factor (Z), molecular weight (MW), inlet gas temperature, inlet gas pressure, outlet gas pressure, adiabatic component (Cp/Cv), and mass flow rate.

Let’s start with an example while I show you step-by-step of the calculation method. In this example, we have these gas properties (I use US units).

*Compressibility factor (Z) = 0.9972*

*Molecular weight (MW) = 18.15*

*Gas constant (R) = 1544/molecular weight*

*Inlet temperature (T1) = 546 deg R*

*Inlet pressure (P1) = 15 psia (don’t forget to use absolute pressure)*

*Outlet pressure (P2) = 60 psia*

**K** (Cp/Cv) = 1,274

*Flow (W) = 0,184 lb/min*

The required data to calculate centrifugal compressor power is **head**. We can use either adiabatic head or polytropic head as long as we use adiabatic efficiency and polytropic efficiency in companion. Read More