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, verify that the fluid velocity for the valve size does not exceed the maximum recommended velocity for the selected valves.

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:
Pipe size:       Valve size*:    
Please enter the pipe size. Please enter the valve size.
Pump Flow Rate (Q):       Percent useage (U): %    
Please enter the pump flow rate. Please enter the percent usage.
Specific Gravity (Sg):       Efficiency of Pump/Motor (E): %    
Please enter the specific gravity. Please enter the efficiency of pump motor.
Cost of Electricity (C):      
Please enter the cost of electricity.  
* Smaller than pipe size valves can be used for better control and lower initial cost.
2. Select Valve Types for Comparison:
Lift Check Valves
Ball Check (2-14 in)
Wafer Silent Check (2-10 in)
Globe Silent Check (2.5-42 in)

Swing Check Valves
Dual Disc® (2-60 in)
Swing Check w/L&W (2-48 in)
SURGEBUSTER®/Swing-Flex® (2-48 in)
Tilted Disc® (4-60 in)

Pump Control Valves
Globe-Style Control (2-48 in)
AWWA Ball (4-60 in)
AWWA Butterfly (3-120 in)
Cone (4-48 in)

Shut Off Valves
AWWA Butterfly (3-120 in)
AWWA Gate (2-48 in)
Eccentric Plug (2-72 in)
AWWA Ball (4-60 in)
Please select at least one valve.
3. Calculate Energy Costs of the Selected Valves:    

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