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Plotting system resistance onto turbo compressor map

Plotting system resistance onto turbo compressor map

Plotting system resistance onto turbo compressor map

(OP)
Hello,

I've cross posted this on another forum, but I suspect I may have more success here.

Basically I'm wanting to plot a set of system resistance curves (for a group of CAC's [charge air coolers]) onto a turbocharger compressor map.

I have a set of pressure drop curves for my CAC's, showing pressure drop (mbar) against mass flow (kg/min).  I want to plot these onto my turbocharger compressor map, to give me a set of system resistance curves.

I can convert the mass flows into the correct volumetric flow units required by the compressor map (x-axis), but I'm unsure how to convert the pressure drop units into a pressure ratio (required by the y-axis on the compressor map).

Do I need to divide intercooler inlet pressure by outlet pressure (giving me a pressure ratio) and plot that on the compressor map?  If I do this, the CAC PR values seem too low, ranging from 1 to 1.4, which when plotted are basically off the bottom of the map.  Am I missing something?  Do I need to calculate the CAC outlet pressure relative to ambient?

Any help would be much appreciated.  I can find some similar(ish) information relating to centrifugal water pumps, but I'm not sure how to proceed with this case.

Regards,  

RE: Plotting system resistance onto turbo compressor map

No cross-posting please.  
It wastes a lot of time.

This question really should be in the gas compression forum.

See original post here,
thread71-239919: Estimating dPg/mass flow from compressor maps?

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

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