Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

# Pump - Temperature Rise vs. Volume Flow

## Calculate temperature rise vs. volume flow in pumps.

No pump is perfect with 100% efficiency. Energy lost in friction and hydraulic losses transforms to heat - heating up the fluid transported through the pump.

The temperature rise can be calculated as

dt = Ps (1 - μ) / (cp q ρ)                                       (1)

where

dt = temperature rise in the pump (oC)

q = volume flow through pump (m3/s)

Ps = brake power (kW)

cp = specific heat of the fluid (kJ/kgoC)

μ = pump efficiency

ρ = fluid density (kg/m3)

A typical relation between flow, efficiency and power consumption for a centrifugal pump:

### Example - Temperature rise in water pump

Temperature rise in a water pump working at normal conditions with flow 6 m3/h (0.0017 m3/s), brake power 0.11 kW and pump efficiency of 28% (0.28) can be calculated as

dt = (0.11 kW) (1 - 0.28) / ((4.2 kJ/kgoC) (0.0017 m3/s) (1000 kg/m3))

= 0.011 oC

Specific heat of water cp = 4.2 kJ/kgoC.

If the flow through the pump is reduced by throttling the discharge valve the temperature rise increase. If the flow is reduced to 2 m3/h (0.00056 m3/s), brake power slightly reduced to 0.095 kW and the pump efficiency reduced to 15% (0.15) - the temperature rise can be calculated as

dt = (0.095 kW) (1 - 0.15) / ((4.2 kJ/kgoC) (0.00056 m3/s) (1000 kg/m3))

= 0.035 oC

With manufacturing documentation the temperature rise versus throttling can be expressed as:

## Related Topics

• ### Pumps

Design of pumping systems and pipelines. With centrifugal pumps, displacement pumps, cavitation, fluid viscosity, head and pressure, power consumption and more.

## Related Documents

• ### BEP - the Best Efficiency Point of a Pump

BEP is where the pump is most efficient.
• ### Centrifugal Pumps

An introduction to Centrifugal Pumps.
• ### Centrifugal Pumps - Capacity Modulation

Modulating pumps to adapt capacities to variable process demands.
• ### Positive Displacement Pumps

Introduction tutorial to positive displacement pumps basic operating principles.
• ### Pump Power Calculator

Calculate pumps hydraulic and shaft power.
• ### Pumping Water - Energy Cost Calculator

Calculate the energy cost of pumping water.
• ### Pumps - Classifications

Centrifugal pumps vs. positive displacement pumps.
• ### Pumps, Fans and Turbines - Horsepower

British Horse Power as used for pumps, fans and turbines - and how to convert to other units.
• ### System Curve and Pump Performance Curve

Utilize the system curve and the pump performance curve to select the proper pump for a particular application.

## Search

Search is the most efficient way to navigate the Engineering ToolBox.

## Engineering ToolBox - SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

## Citation

• The Engineering ToolBox (2006). Pump - Temperature Rise vs. Volume Flow. [online] Available at: https://www.engineeringtoolbox.com/pumps-temperature-increase-d_313.html [Accessed Day Month Year].

Modify the access date according your visit.

5.16.12

.