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In Situ Refractometry for Concentration Measurements in Refrigeration Systems
An in situ refractometer was developed that is capable of measuring both the concentrations of oil in refrigerants, and the concentrations of aqueous coolant brines. A description of the technique, and example data are presented for R-134a/PAG oil, aqueous ethylene glycol, and aqueous propylene glycol solutions. The R- 134a/PAG oil sensor data show a measurement sensitivity of less than 0.1% oil in the refrigerant, although error between data sets shows an uncertainty of approximately ±0.8%. Ethylene glycol and propylene glycol data show high signal level variations due to the large variation of the index of refraction between water and the glycols.
In Situ Refractometry for Concentration Measurements in Refrigeration Systems
An in situ refractometer was developed that is capable of measuring both the concentrations of oil in refrigerants, and the concentrations of aqueous coolant brines. A description of the technique, and example data are presented for R-134a/PAG oil, aqueous ethylene glycol, and aqueous propylene glycol solutions. The R- 134a/PAG oil sensor data show a measurement sensitivity of less than 0.1% oil in the refrigerant, although error between data sets shows an uncertainty of approximately ±0.8%. Ethylene glycol and propylene glycol data show high signal level variations due to the large variation of the index of refraction between water and the glycols.
In Situ Refractometry for Concentration Measurements in Refrigeration Systems
Newell, Ty A. (author)
HVAC&R Research ; 2 ; 247-255
1996-07-01
9 pages
Article (Journal)
Electronic Resource
Unknown
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