How to plot actual compressor performance on manufacturer performance chart?

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Discussion Overview

The discussion revolves around how to accurately plot actual compressor performance data on a manufacturer's performance chart. Participants explore the discrepancies between actual and expected performance metrics, including flow rates and operational speeds.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • EP seeks guidance on plotting actual compressor performance on a manufacturer's chart and provides initial performance data.
  • EP acknowledges a misunderstanding regarding the performance metrics and proposes that the compressor requires higher speeds to achieve expected flow, suggesting a decrease in efficiency.
  • Another participant questions the validity of EP's conclusions, noting that differences in inlet conditions may affect the compressor's performance as represented on the map.
  • EP summarizes the actual operating conditions, indicating a need for more power and suggesting energy loss due to high discharge temperatures.

Areas of Agreement / Disagreement

Participants express differing views on the implications of the performance data, with some agreeing on the need for further analysis while others highlight the importance of specific inlet conditions affecting the compressor's performance.

Contextual Notes

The discussion lacks detailed explanations of the specific application or context in which the compressor is being used, which may limit the clarity of the performance analysis.

Who May Find This Useful

This discussion may be useful for engineers or technicians involved in compressor performance analysis, particularly those interested in comparing actual performance to manufacturer specifications.

engine_puppet
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How to plot actual compressor performance on manufacturer" performance chart?

Hi all,

I have problem on plotting the actual compressor performance on manufacturer" performance chart. Can someone guide me?

Please see the attached figure for detailed information.

Thanks,
EP
 

Attachments

  • actual vs ideal performance.jpg
    actual vs ideal performance.jpg
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I submitted another file because the picture is not so clear.

thanks,
EP
 

Attachments



Hmmm, I don't see how it can be either of those points given the flow and pressure quoted for the "actual" condition.
 


thanks for replying, now I know that i was wrong.

how about this?

Should I read like this?

At the actual performance, the engine needs more speed to achieve the expected HEAD and Flow. It means the compressor is still in good condition, but the engine is not so efficient as before.

Am I correct?

please see the attachment file, i just corrected the whole chart.

thanks,
EP
 

Attachments



I have no idea, since you haven't explained what your situation, application or problem is, other than that you're trying to plot something on a compressor map.
 


The situation is:

on the actual operating performance:
The compressor needs to run on 13485 rpm in order to achieve the expected flow of 9328 CFM with the Hisen of 64678 ft-lbf/lbm.

ideally (according to the mfg performance map):
the compressor originally can run on 11650 rpm with these conditions (Flow=9328CFM and Hisen=64678 ft-lbf/lbm).

Summary:
The unit needs more power to deliver the expected flow. it means the unit is not so efficient as before, there is LOSS of ENERGY on the unit. As an indication, the unit has high discharge temperature. (Energy loss --> heat)

EP
 

Attachments



I don't disagree with your statements on an intuitive level. I do notice that the inlet conditions are a bit different. The compressor map is only really valid for the specified inlet conditions so that may also be contributing to the discrepancy. For example, you are actually starting with a higher inlet temperature than the plot was made for.
 


okay, thank you!

I'll try to get the proper map first.

mfg,
EP
 

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