Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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A Study on the Humidity Paper for Indicating Moisture Absorbed in R-22

냉매 R-22에 함유된 수분 감습지 연구

  • Kim, Si-Young (Dept. of Mechanical System Engineering, Pukyong National University) ;
  • Ju, Chang-Sik (Dept. of Chemical Engineering, Pukyong National University)
  • 김시영 (부경대학교 기계시스템공학과) ;
  • 주창식 (부경대학교 화학공학과)
  • Received : 2014.08.11
  • Accepted : 2014.09.02
  • Published : 2014.10.31
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Abstract

This study performed experimental research to visualize the moisture content absorbed in R-22, refrigerant of refrigerator. Sulfuric acids were mixed with bromothylmol blue solution to make indicating solutions, and humidity papers were prepared by impregnation of the indicating solutions into solid supporters. Prior to the impregnation, small amount of lithium chloride was added into indicating solution. Moisture measuring cell was composed to test sensitivity of the humidity papers. Color changing characteristics of the humidity papers were also examined at various moisture contents in R-22. Color of the humidity paper varied linearly with the moisture content in R-22 in the range from 150 ppm to 300 ppm. The humidity papers showed complete color change to yellow at the moisture content of 300 ppm within 8 hours.

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References

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