Motor and Pump Application Formula Save Energy and Make You Smart Designer

A gerotor (image does not show intake or exhaust)
A gerotor (image does not show intake or exhaust) (Photo credit: Wikipedia)

How Motor and Pump Application Formula can Save Energy and Make You Smart Designer?

Motor and Pump applications simple formula can save energy by helping effective design for using maximum efficiency of your equipments. Some times we ignore these basic design formula and use larger size of equipment using thump-role formula which cases extra money energy as wastage. 


If we love ourself to be a energy saver or go to as green environment; we should take care of every bit of energy uses. Following motor and pump applications formula can help us to effective use of energy.

Centrifugal Applications


AFFINITY LAWS

The Affinity Laws of centrifugal pumps or fans indicates the influence on volume capacity, head (pressure) and/or power consumption of a pump or fan due to
  • change in speed of wheel - revolutions per minute (rpm)
  • geometrically similarity - change in impeller diameter

Following three affinity formulas are related with simply motor horse powerRPM (revolution per minute), Flow and pressure.

Flow2
=
RPM2
Flow1
RPM1
Pres2
=
(RPM2)2
Pres1
(RPM1)2
HP2
=
(RPM2)3
HP1
(RPM1)3


Where:
Pres=Pressure
RPM= Revolutions Per Minute

FANS AND BLOWERS


Centrifugal Fans and Blowers typically have one of seven types of wheels that draw the air into the inlet of the blower housing, through the wheel, and discharges it at 90 degrees out through the discharge of the housing.

The two most common types of Centrifugal Blowers are Pressure Blowers and Volume Blowers.

Fans and Blowers are very common uses in industry, Basic three formula can help you to design effective and perfect size of fan and blower as your desired. 

HP  =
CFM x PSF
33000 x Efficiency of Fan
HP  =
CFM x PIW
6356 x Efficiency of Fan




HP  =
CFM x PSI
229 x Efficiency of Fan



Where:
CFM= Cubic Feet per Minute
PIW= Inches of Water Gauge
PSF= Pound per Square Foot
PSI= Pound per Square Inches



PUMPS

Pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps.

Perfect capacity of pump design and operation is very important which can help the following two simple formula.




HP  =
GPM x FT x Specific Gravity
3960 x Efficiency of Pump



HP  =
GPM x PSI x Specific Gravity
1713 x Efficiency of Pump




Where:
FT= Head in Feet
GPM= Gallons Per Minute
PSI= Pounds Per Square Inch

VOLUME OF LIQUID IN A TANK


Gallons= 5.875 x D2 x H
1 gallon (US) of water weights 8.33 lb
Specific gravity of water- 1.0

Where:
D= Diameter of Tank in feet
H= Height of liquid in feet


Motor Application Formulas

Following motor applications formula is necessary everyday every moment.  It will help to calculate your motor's HP (Horse Power), Kilowatts, Torque in Pound-feet or Newton-meter.

HP(Horse Power)  =
Torque (lb-ft) x RPM
5252



Kilowatts  =
Torque (N-m) x RPM
9550




Torque (lb-ft)  =
Horse Power (HP) x 5252
RPM



Torque (N-m) =
Kilowatts x 9550
RPM




1HP= 746 watts
Hope motor and pump application formula will help to design a smart and effective energy saving initiative. 

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