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Design and calibration of capacitive sensors for measuring void fraction in vertical headers of microchannel heat exchangers.

Author(s) : QIAN H., HRNJAK P.

Type of article: IJR article

Summary

This paper presents new capacitive sensors built and calibrated to measure cross-sectional void fraction between tubes in vertical headers of microchannel heat exchangers (MCHEs). Eleven individual sensors are assembled into one test header to measure local capacitance independently in real-time. A calibration procedure based on visualization, pressure drop, signal patterns, and mass measurement (quick-closing valve technique, QCV) is proposed. After the calibration, most void fraction data predicted by all eleven sensors fall into ±10% deviations of the experimental results by QCV. The sensors are ready to be utilized to measure local void fraction along vertical inlet or intermediate headers of MCHEs in future studies.

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Pages: 224-236

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Details

  • Original title: Design and calibration of capacitive sensors for measuring void fraction in vertical headers of microchannel heat exchangers.
  • Record ID : 30028713
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 129
  • Publication date: 2021/09
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.05.012
  • Document available for consultation in the library of the IIR headquarters only.

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