# Energy Cost Calculator

Energy Cost Calculator for Valves
PURPOSE:

Valve Selection affects energy consumption in pumping systems. Follow the three steps below to see the energy consumption for various check valves, pump control valves, and shut off valves.

Pump Control Valves are sometimes smaller than the pipe size to lower the initial cost and improve controllability. However, valve size should be selected such that the fluid velocity through the valve doesn’t exceed the recommended maximum for the selected valve types.

Valve headloss can be converted into pump energy cost by the equation:

40-Year Energy Cost = 40 * 1.65 Q ∆h Sg C U / E

Where:
Q = flow rate, gpm
∆h = head loss of valve and reducers, ft. of water (based on typical flow coefficients)
Sg = specific gravity, dimensionless
C = cost of electricity /kW·hr
U = usage, percent
E = efficiency of pump/motor set, percent

1. Specify Operating Parameters:
Please enter the pipe size.
Please enter the pump flow rate.
Please enter the specific gravity.
Please enter the cost of electricity.
Please enter the valve size.
Please enter the percent usage.
Please enter the efficiency of pump motor.
1 Velocity inputs for Pump Flow Rate (Q) [ft/s and m/s] are with reference to the Pipe Size.
2 Smaller than pipe size valves can be used for better control and lower initial cost.
2. Select Valve Types for Comparison:
Please select at least one valve.

Selected Valves Kvalve Kreducer ∆h Vvalve Vmax Energy cost over 40-year life of pumping system
NOTE: The Resistance Coefficients (K) are calculated based on pipe diameter
Headloss(∆h) is expressed in feet of water column and includes pipe reducers for smaller than pipe size valves
Velocity (Vvalve & Vmax) are expressed in feet per second