Design and characterization of refrigerant reference leaks

Research output: Contribution to journalArticle

Abstract

Nowadays, leak detection is widely used in many fields such as automotive and refrigeration industries. European Regulation No 517/2014 identifies leak tightness as the key point to decrease the emissions of the refrigerant gases with greenhouse effect. Tightness of systems charged with refrigerant fluids must be controlled periodically by refrigerant gas detectors. According to the Commission Regulation No 1516/2007 these detectors are required to be tested at least once per year with reference leaks, or “calibrated” leaks, to confirm a detection limit of 5 g per year. For this purpose, a technique to built reliable reference leaks made of R134a (1,1,1,2-tetrafluoroethane) is described. These leaks are suitable to fulfill the requirements of EN14624:2012 which defines the procedure to test refrigerant leak detectors. The proposed design takes advantage of the suitable permeability of vinyl methyl silicone rubber (MVQ silicone). The leak rate is adjusted by the size of a hole drilled in the reservoir cap. The described design is suitable to manufacture reference leaks having leak rates from 1 to 30 g per year. The long term stability was found to be within the calibration uncertainty of ±3% and the temperature coefficient of 3.2% per K.

Translated title of the contributionDesign and characterization of refrigerant reference leaks
Original languageFrench
Pages (from-to)463-470
Number of pages8
JournalInternational Journal of Refrigeration
Volume100
DOIs
Publication statusPublished - 1 Apr 2019

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Refrigerants
Silicones
Gas detectors
Detectors
Greenhouse effect
Leak detection
Refrigeration
Rubber
Calibration
Fluids
Gases
Industry
Temperature

Keywords

  • Leak calibration
  • Leak detector
  • Permeation
  • R134a leak
  • Reference leak

Cite this

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title = "Conception et caract{\'e}risation des fuites d’{\'e}talonnage de frigorig{\`e}ne",
abstract = "Nowadays, leak detection is widely used in many fields such as automotive and refrigeration industries. European Regulation No 517/2014 identifies leak tightness as the key point to decrease the emissions of the refrigerant gases with greenhouse effect. Tightness of systems charged with refrigerant fluids must be controlled periodically by refrigerant gas detectors. According to the Commission Regulation No 1516/2007 these detectors are required to be tested at least once per year with reference leaks, or “calibrated” leaks, to confirm a detection limit of 5 g per year. For this purpose, a technique to built reliable reference leaks made of R134a (1,1,1,2-tetrafluoroethane) is described. These leaks are suitable to fulfill the requirements of EN14624:2012 which defines the procedure to test refrigerant leak detectors. The proposed design takes advantage of the suitable permeability of vinyl methyl silicone rubber (MVQ silicone). The leak rate is adjusted by the size of a hole drilled in the reservoir cap. The described design is suitable to manufacture reference leaks having leak rates from 1 to 30 g per year. The long term stability was found to be within the calibration uncertainty of ±3{\%} and the temperature coefficient of 3.2{\%} per K.",
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