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Evaluation of positive displacement compressor testing techniques, variation, and uncertainty.

Number: 1204

Author(s) : SCHMIG A., SJOHOLM L.

Summary

The design and performance modeling of a compressor relies heavily on thermodynamic and physical models, but many times compressor models are validated and calibrated empirically. Representations of compressor performance using polynomial fits such, as defined by AHRI 540, as well as more complicated mid-fidelity semi-empirical models rely on the method of test defined in ASHRAE standard 23 to produce performance data. Even with an empirical representation of compressor performance, one must understand the sources of error in this process to best understand the impact of design related changes, or how this error may propagate to system level predictions.
This study will compare different compressor test facility types and evaluate the pros and cons of each cycle architecture as well as sources of measurement variation and uncertainty. Compressor performance testing facility cycles generally fall into 3 categories, (fully condensing, partial condensing, and non-condensing) which use similar components and measurement devices, but each have unique characteristics which will be highlighted. Characterization of testing variation and uncertainty will be evaluated considering short-term tests, long term tests, as well as testing on multiple different compressor test facilities. Variation in compressor performance metrics will be evaluated given normal variation in setpoint stability, instrument uncertainty, refrigerant composition, and other common sources of compressor testing variation.

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Pages: 8

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Details

  • Original title: Evaluation of positive displacement compressor testing techniques, variation, and uncertainty.
  • Record ID : 30033584
  • Languages: English
  • Subject: Regulation, Technology
  • Source: 2024 Purdue Conferences. 27th International Compressor Engineering Conference at Purdue.
  • Publication date: 2024/07/18

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