Overall efficiency Calculator

✖Specific weight of fluid in pump is the weight of fluid per unit volume.ⓘ Specific weight of fluid in pump [w]			+10% -10%
✖Actual discharge at centrifugal pump outlet is the actual amount of the liquid outflow from the outlet of the centrifugal pump.ⓘ Actual discharge at centrifugal pump outlet [Q]			+10% -10%
✖The Manometric Head of Centrifugal Pump is the head against which the centrifugal pump has to work.ⓘ Manometric Head of Centrifugal Pump [H_m]			+10% -10%
✖Input power to centrifugal pump is the power at the input or the inlet of a centrifugal pump.ⓘ Input power to centrifugal pump [P_in]			+10% -10%

✖Overall efficiency of centrifugal pump is the ratio of the power output of the pump to the power input to the pump.ⓘ Overall efficiency [η_o]

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Formula

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Overall efficiency

Formula

`"η"_{"o"} = ("w"*"Q"*"H"_{"m"})/"P"_{"in"}`

Example

`"0.441232"=("9.81kN/m³"*"0.056m³/s"*"25.3m")/"31.5kW"`

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Overall efficiency Solution

STEP 0: Pre-Calculation Summary

Formula Used

Overall efficiency of centrifugal pump = (Specific weight of fluid in pump*Actual discharge at centrifugal pump outlet*Manometric Head of Centrifugal Pump)/Input power to centrifugal pump
η_o = (w*Q*H_m)/P_in
This formula uses 5 Variables

Variables Used

Overall efficiency of centrifugal pump - Overall efficiency of centrifugal pump is the ratio of the power output of the pump to the power input to the pump.
Specific weight of fluid in pump - (Measured in Newton per Cubic Meter) - Specific weight of fluid in pump is the weight of fluid per unit volume.
Actual discharge at centrifugal pump outlet - (Measured in Cubic Meter per Second) - Actual discharge at centrifugal pump outlet is the actual amount of the liquid outflow from the outlet of the centrifugal pump.
Manometric Head of Centrifugal Pump - (Measured in Meter) - The Manometric Head of Centrifugal Pump is the head against which the centrifugal pump has to work.
Input power to centrifugal pump - (Measured in Watt) - Input power to centrifugal pump is the power at the input or the inlet of a centrifugal pump.

STEP 1: Convert Input(s) to Base Unit

Specific weight of fluid in pump: 9.81 Kilonewton per Cubic Meter --> 9810 Newton per Cubic Meter (Check conversion here)
Actual discharge at centrifugal pump outlet: 0.056 Cubic Meter per Second --> 0.056 Cubic Meter per Second No Conversion Required
Manometric Head of Centrifugal Pump: 25.3 Meter --> 25.3 Meter No Conversion Required
Input power to centrifugal pump: 31.5 Kilowatt --> 31500 Watt (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

η_o = (w*Q*H_m)/P_in --> (9810*0.056*25.3)/31500

Evaluating ... ...

η_o = 0.441232

STEP 3: Convert Result to Output's Unit

0.441232 --> No Conversion Required

FINAL ANSWER

0.441232 <-- Overall efficiency of centrifugal pump

(Calculation completed in 00.004 seconds)

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Created by Sagar S Kulkarni

Dayananda Sagar College of Engineering (DSCE), Bengaluru

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Verified by Vaibhav Malani

National Institute of Technology (NIT), Tiruchirapalli

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< 19 Geometric and Flow Parameters Calculators

Mechanical efficiency given Specific Weight of Liquid

Go Mechanical efficiency of centrifugal pump = (Specific weight of fluid in pump*(Actual discharge at centrifugal pump outlet+Leakage of Liquid from Impeller)*(Velocity of Whirl at Outlet*Tangential Velocity of Impeller at Outlet/[g]))/Input power to centrifugal pump

Overall efficiency

Go Overall efficiency of centrifugal pump = (Specific weight of fluid in pump*Actual discharge at centrifugal pump outlet*Manometric Head of Centrifugal Pump)/Input power to centrifugal pump

Flow velocity at outlet given volume of liquid

Go Flow velocity at outlet of centrifugal pump = Actual discharge at centrifugal pump outlet/(pi*Diameter of centrifugal pump impeller at outlet*Width of Impeller at Outlet)

Volume of liquid at outlet

Go Actual discharge at centrifugal pump outlet = pi*Diameter of centrifugal pump impeller at outlet*Width of Impeller at Outlet*Flow velocity at outlet of centrifugal pump

Flow velocity at inlet given volume of liquid

Go Flow velocity at inlet of centrifugal pump = Actual discharge at centrifugal pump outlet/(pi*Diameter of centrifugal pump impeller at inlet*Width of Impeller at Inlet)

Volume of liquid at inlet

Go Actual discharge at centrifugal pump outlet = pi*Diameter of centrifugal pump impeller at inlet*Width of Impeller at Inlet*Flow velocity at inlet of centrifugal pump

Thoma's cavitation factor

Go Thoma's Cavitation Factor = (Atmospheric Pressure Head for Pump-Suction head of centrifugal pump-Vapour Pressure Head)/Manometric Head of Centrifugal Pump

Leakage of Liquid given Volumetric Efficiency and Discharge

Go Leakage of Liquid from Impeller = (Actual discharge at centrifugal pump outlet/Volumetric efficiency of centrifugal pump)-Actual discharge at centrifugal pump outlet

Torque at outlet

Go Torque at Centrifugal Pump Outlet = (Weight of liquid in pump/[g])*Velocity of Whirl at Outlet*Radius of Impeller at Outlet

Flow velocity given flow ratio

Go Flow velocity at outlet of centrifugal pump = Flow ratio centrifugal pump*sqrt(2*[g]*Manometric Head of Centrifugal Pump)

Flow ratio

Go Flow ratio centrifugal pump = Flow velocity at outlet of centrifugal pump/sqrt(2*[g]*Manometric Head of Centrifugal Pump)

Diameter of delivery pipe

Go Diameter of delivery pipe of pump = sqrt((4*Actual discharge at centrifugal pump outlet)/(pi*Velocity in Delivery Pipe))

Speed ratio

Go Speed ratio centrifugal pump = Tangential Velocity of Impeller at Outlet/sqrt(2*[g]*Manometric Head of Centrifugal Pump)

Diameter of suction pipe

Go Diameter of suction pipe of pump = sqrt((4*Actual discharge at centrifugal pump outlet)/(pi*Velocity in Suction Pipe))

Net positive suction head

Go Net Positive Suction Head of Centrifugal Pump = Atmospheric Pressure Head for Pump-Static Head of Centrifugal Pump-Vapour Pressure Head

Thoma's Cavitation factor given Net Positive Suction Head

Go Thoma's Cavitation Factor = Net Positive Suction Head of Centrifugal Pump/Manometric Head of Centrifugal Pump

Weight of liquid

Go Weight of liquid in pump = Specific Weight of Liquid*Actual discharge at centrifugal pump outlet

Static head

Go Static Head of Centrifugal Pump = Suction head of centrifugal pump+Delivery head of pump

Vane efficiency

Go Vane Efficiency = Actual Head of Pump/Euler Head of Pump

Overall efficiency Formula

What is overall efficiency?

The ratio of the power output of the pump to the power input of the pump is known as overall efficiency.

How to Calculate Overall efficiency?

Overall efficiency calculator uses Overall efficiency of centrifugal pump = (Specific weight of fluid in pump*Actual discharge at centrifugal pump outlet*Manometric Head of Centrifugal Pump)/Input power to centrifugal pump to calculate the Overall efficiency of centrifugal pump, The Overall efficiency formula is defined as the ratio of the product of specific weight, discharge, and manometric head to the power input. Overall efficiency of centrifugal pump is denoted by η_o symbol.

How to calculate Overall efficiency using this online calculator? To use this online calculator for Overall efficiency, enter Specific weight of fluid in pump (w), Actual discharge at centrifugal pump outlet (Q), Manometric Head of Centrifugal Pump (H_m) & Input power to centrifugal pump (P_in) and hit the calculate button. Here is how the Overall efficiency calculation can be explained with given input values -> 0.441232 = (9810*0.056*25.3)/31500.

FAQ

What is Overall efficiency?

The Overall efficiency formula is defined as the ratio of the product of specific weight, discharge, and manometric head to the power input and is represented as η_o = (w*Q*H_m)/P_in or Overall efficiency of centrifugal pump = (Specific weight of fluid in pump*Actual discharge at centrifugal pump outlet*Manometric Head of Centrifugal Pump)/Input power to centrifugal pump. Specific weight of fluid in pump is the weight of fluid per unit volume, Actual discharge at centrifugal pump outlet is the actual amount of the liquid outflow from the outlet of the centrifugal pump, The Manometric Head of Centrifugal Pump is the head against which the centrifugal pump has to work & Input power to centrifugal pump is the power at the input or the inlet of a centrifugal pump.

How to calculate Overall efficiency?

The Overall efficiency formula is defined as the ratio of the product of specific weight, discharge, and manometric head to the power input is calculated using Overall efficiency of centrifugal pump = (Specific weight of fluid in pump*Actual discharge at centrifugal pump outlet*Manometric Head of Centrifugal Pump)/Input power to centrifugal pump. To calculate Overall efficiency, you need Specific weight of fluid in pump (w), Actual discharge at centrifugal pump outlet (Q), Manometric Head of Centrifugal Pump (H_m) & Input power to centrifugal pump (P_in). With our tool, you need to enter the respective value for Specific weight of fluid in pump, Actual discharge at centrifugal pump outlet, Manometric Head of Centrifugal Pump & Input power to centrifugal pump and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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