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Small Compressed Air Analysis Tool

Small Compressed Air Analysis Tool. Summary of Subcommittee Meeting Presented to the Regional Technical Forum on January 6, 2008. Background. Compressed air savings calculator developed by Cascade Energy Engineering

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Small Compressed Air Analysis Tool

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  1. Small Compressed Air Analysis Tool Summary of Subcommittee Meeting Presented to the Regional Technical Forum on January 6, 2008

  2. Background • Compressed air savings calculator developed by Cascade Energy Engineering • Proposal at the Nov 2008 RTF meeting was to allow the calculator to be used in lieu of more detailed M&V to determine savings for systems under 75 hp • RTF asked for real-world data to verify calculator works properly

  3. Subcommittee Meeting – 12/18/08 • Attendees (conference call) • Jeff Brooks • Chris Helmers • Tom Osborn • Greg Kelleher • Joel Jackson • Paul Warila • Al Frazer • Eric Brateng • Adam Hadley

  4. Subcommittee Meeting Materials • Memo: QEI Energy Management Inc (John Shinn) to Pacific Corp (11/13/08) • Tool should ask for rated input bhp; tool should include an efficiency penalty for VFD’s; Tool should correct compressor’s flow for operating pressure • “The baseline power is developed from the percent load with the equation of the performance curve for the compressor with the components for the equations coming from various look-up tables. The slope and intercepts are reasonable for the various compressor types. I think the author handled the VFD minimum power dilemma very well…” • “ The accuracy of the tool will depend in a large part on the percent flow in the ‘profile of compressed air demand’ table. My concern is that most plants will not be able to fill this out accurately. I imagine a manual of some type will come with the tool and the manual will provide some quantitative and non-quantitative methods for estimating these part-load values.” • “Since you have a great deal riding on the user’s ability to correctly use this tool, I would not give it to anyone until they have had a training class...” • Memo: EWEB Review of Regional Compressed Air Calculator • “We found the analysis to be generally accurate, but have a few comments.” • “We feel the Achilles Heel of the calculator is the ‘profile of compressed air demand’ input table…it is critical we find a way to reduce the potential for errors in the inputs…ways to mitigate this error – for example: training, help screens, user manuals.” • “It’s not possible to go back and estimate demand profiles on a compressor that has already been replaced. Using the monitored data to ‘guess’ a profile would, by default, bias the results toward over-predicting the accuracy.” • Cascade Energy Engineering’s “sensitivity checks” (next two slides)

  5. Sensitivity Check – Inlet Mod Provided by Cascade Energy Engineering

  6. Sensitivity Check – Load/Unload Provided by Cascade Energy Engineering

  7. Subcommittee Recommendation to RTF • The subcommittee believes the calculator provides reasonable outputs, if reasonable inputs are provided.   • The RTF subcommittee recommends that the RTF allow the use of the compressed air tool to determine energy savings (in lieu of M&V) for compressed air systems 75 horsepower and less.   • The calculator should be used by qualified users and all calculator inputs should be reviewed by a utility engineer or program provider.   • The calculator will be modified to provide space for the user to provide a description of how the "profile of compressed air demand" was derived.

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