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Real Time Oil Concentration Measurement in Automotive Air Conditioning by Ultraviolet Light Absorption
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English
Abstract
A method of real time oil concentration measurment has been developed utilizing the effect of ultraviolet light absorption by lubricating oil in the liquid refrigerant line of an automotive air conditioning system. The light wavelengths from 200nm to 370nm are selected based on the ultraviolet light absorption sensitivity of the oils and refrigerants (CFC12,HFC134a).
The effects of temperature,pressure and contaminantion on the absorbance of light are investigated in order to determine how these parameters affect the concentration measurement. The density changes of refrigerants are then compensated in the calculation for the oil concentration. The uncertainties of the overall concentration measurement are less than ±0.1 weight percent at 1 weight percent concentration.
A transient oil circulation of the automotive air conditioner is measured by using this method.
Authors
Citation
Kutsuna, K., Inoue, Y., Mizutani, T., Sudo, E. et al., "Real Time Oil Concentration Measurement in Automotive Air Conditioning by Ultraviolet Light Absorption," SAE Technical Paper 910222, 1991, https://doi.org/10.4271/910222.Also In
References
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- Baustian J.J. et al “Properties of Oil Refrigerant Liquid Mixtures with Applications to Oil Concentration Measurement, Part-2 Electrical and Optical Properties,” ASHRAE Trans. 92 1986
- Suzuki S. et al “Measurement Method of Oil Circulating Ratio Using Light Absorption,” JRA (Japanese Association of Refrigeration) Lecture Meeting 1989-11
- Silverstain R.M. “Identification of Organic Counpound by Spectrum Analysis,” 4th Tokyo kagaku douzin
- JRA “Thermophysical Properties of Refrigerant R12,” 1981
- Fukushima M. et al “An Evaluation as for Thermophysical Properties R134a,” 29th High Pressure Conference of Japan 1988
- Japan Society of Mechanical Engineers “Measurement Uncertainty,” 1987
- JIS “Testing Method for Automobile Air Conditioners,” 1986