Heat Transfer in a Pump

[texag]

I am trying to do some calculations to quantify the rate at which heat is added to cooling/lubricating oil in a positive displacement (plunger type) pump. The largest contributing factors should be the oil viscosity, rpm of the pump, and time the pump is running. Our typical system can be simplified to a large (30-50gal) reservoir, centrifugal pump, and the plunger pump itself. I do have significant amounts of empirical data from previous testing but would like to build a mathematical model to determine whether or not a heat exchanger is needed to keep the 90W oil within acceptable temperatures based on the operating conditions. Any suggestions or help getting me started would be greatly appreciated.

 

[BigInch]

Start with the basic model. Power available for raising temperature = Power delivered by motor to pump shaft - power used by the pump. That's the gross heat input. Some heat may be lost through the cylinder, but most will wind up as heat added to the liquid.

Then see if you can make some refinements to account for heat lost through the cylinder using your measured data.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[texag]

Yes, the lightbulb came on a few hours after I posted this thread. If I can assume 90% mechanical efficiency then the 10% that is not converted into hydraulic horsepower is converted to heat through frictional losses. Thanks for the help.