formulas for quick calculation of horsepower and power
TRANSCRIPT
-
8/4/2019 Formulas for Quick Calculation of Horsepower and Power
1/4
TecSmart at iProcesSmartQUICK ESTIMATE FORMULAS
Horsepower Formulas
Torque Formulas
AC Motor Formulas
Electrical Formulas
Acceleration Formulas
HORSEPOWER FORMULAS
For Rotating
Objects
HP =
WhereT = Torque (lbft)
N = Speed (rpm)
Objects in
Linear Motion
HP =
WhereF = Force (lbs)
V = Velocity (ft/min)
For Pumps HP =
HP =
Where
GPM = Gallons per Minute
Head = Height of Water (ft)
Efficiency of Pump = %/100
PSI = Pounds per Inch
Specific Gravity of Water = 1.0
1 CuFt per Sec. = 448 GPM
1 PSI = A Head of 2.309 ft (water weight)
62.36 lbs per CuFt at 62F
For Fans and
BlowersHP =
HP =
Temperature
Level Controls
Pressure Controls
Flow Controls
Environmental
Electrical
Motion
TechSmart
Manufacturers
Company InfoConversions
Temp Conv
t/c Reference
RTD Reference
Ohm's Law
Power Equations
3-Phase Equations
Pressure Help
Humidity
Compatibility
Elec. Safety Standards
Application Solutions
Research LinksLonWorks
Carbon Dioxide
SEARCH INVENTORY
ulas for quick calculation of horsepower and power http://www.iprocessmart.com/techsmart/form
9/10/2011
-
8/4/2019 Formulas for Quick Calculation of Horsepower and Power
2/4
HP =
Where
CFM = Cubic Feet per Minute
PSF = Pounds per Square Foot
PIW = Inches of Water Gauge
PSI = Pounds per Square Inch
Efficiency of Fan = %/100
For Conveyors HP (verticle)
HP
(horizontal)
Where
F = Force (lbs)
V = Velocity (ft/min)
Coef. of Friction
Ball or Roller Slide = 0.02
Dovetail Slide = 0.20
Hydrostatic Ways = 0.01
Rectangle Ways with Gib = 0.01 to 0.25
TORQUE FORMULAS
T = HP x 5252
N
Where
T = Torque (LbFt)
HP = Horsepower
N = Speed (rpm)
T = F x R
Where
T = Torque (LbFt)
F = Force (Lbs)
R = Radius (Ft)
Ta
(accelerating)
WK2 x Change in RPM
ulas for quick calculation of horsepower and power http://www.iprocessmart.com/techsmart/form
9/10/2011
-
8/4/2019 Formulas for Quick Calculation of Horsepower and Power
3/4
308 x t (Sec)
Where
Ta = Torque (LbFt)
WK2 = Inertia at Motor Shaft (LbFt)2
t = Time to Accelerate (Sec)
Note:To change LbFt2 to InLbSec2, Divide by
2.68
To change InLbSec2 to LbFt2, Mult. by
2.68
AC MOTOR FORMULAS
Sync Speed
=Freq x 120
Number of Poles
Where
Sync Speed = Synchronous Speed
(Rpm)
Freq = Frequency (Hz)
% Slip = (Sync Speed - FL Speed) x 100
Sync Speed
Where
FL Speed = Full Load Speed (Rpm)
Sync Speed = Synchronous Speed
(Rpm)
Reflected
WK2 =WK2 of Load
(Reduction Ratio)2
Home [ Temperature ] [ Level Controls ] [ Pressure Controls ] [ Flow Controls ]
[ Environmental ] [ Electrical ] [ Motion ] [ TechSmart ] [ Manufacturers ]
[ Company Info ][ Conversions ] [ Temp Conv ] [ t/c Reference ] [ RTD Reference ]
[ Ohm's Law ] [ Power Equations ] [ 3-Phase Equations ] [ Pressure Help ] [ Humidity ]
[ Compatibility ] [ Elec. Safety Standards ] [ Application Solutions ] [ Research Links ]
[ LonWorks ] [ Carbon Dioxide ]
ulas for quick calculation of horsepower and power http://www.iprocessmart.com/techsmart/form
9/10/2011
-
8/4/2019 Formulas for Quick Calculation of Horsepower and Power
4/4
Important Notice: By purchasing products from this Site, you acknowledge and agree that you
have read and accept the Terms and Conditions of this online store. For more information email
us at: [email protected]
Copyright 1999 iProcesSmart.com
ulas for quick calculation of horsepower and power http://www.iprocessmart.com/techsmart/form
9/10/2011