Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

On-line Measurement of $H_2$O/LiBr Concentration using Electric Conductivity

전기 전도도를 이용한 $H_2$O/LiBr 용액의 실시간 농도의 측정

  • 박찬우 (LG전선(주) 기계연구소) ;
  • 김정환 (경희대학교 기계공학과 대학원) ;
  • 강용태 (경희대학교 기계산업시스템공학부)
  • Published : 2002.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

The objectives of this paper are to measure the concentration of $H_2$O/LiBr solution by measuring the electrical conductivity and to study the effect of the solution temperature and the concentration on the electrical conductivity of the solution. The solution temperature ranges $20^{\circ},\;40^{\circ},\;and\; 60^{\circ}$ for a fixed concentration during the experiment. The valid ranges of the concentration are two regions, low concentration region (1~20% of LiBr) and high concentration region (55~66% of LiBr). The results show that the conductivity of the solution increases linearly with increasing the solution temperature while it increases without creasing the concentration lower than about 35% of LiBr and decreases with increasing the concentration higher than 35%. This paper proposes experimental correlations for the concentration as functions of the solution temperature and the concentration with error band of $\pm7$% for the low concentration region and $\pm1$% for the high concentration region, respectively. The experimental correlation can be practically used in the on-line measurement without any sampling of solution from the closed system.

Keywords

References

  1. Korean Journal of Air-Conditioning and Refrigeration Engineering winter conference Measurements of LiBr concentration in an absorber of a commercial-sized absorption heat Pump Park, M. S.;Chin, S. M.;Park, C. W.;Jurng, J.;Jung, B. C.
  2. International Journal of Refrigeration v.22 Experimental studies on the characteristics of an absorber using LiBr/H₂O solution as working fluid Deng, S. M.;Ma, W. B.
  3. Korean Journal of Air-Conditioning and Refrigeration Engineering Summer conference A study on the concentration measurement of LiBr solution Family by Reflectivity index Method Joe, H. C.;Kim, C. B.;Jeong, S. Y.;Lee, C. S.
  4. Journal of Chemical and Engineering Data v.37 no.1(Jan) Refractive indexes of aqueous LiBr solutions Zaltsh, A.;Ally, M. R.
  5. ASHARE Research Project AT-90-30-5(3381, RP-527) Properties of Lithium bromide-Water Solutions at High Temperatures and Concentrations-Ⅱ: Density and Viscosity Lee, R. J.;DiGuilio,R. M.;Jeter, S. M.;Teja, A. S.
  6. ASHARE Transactions: Symposia CH-99-10-5(RP-919) Secondary Properties od Aqueous Lithium Bromide Solutions Heinonen, Everett W.;Tapscott, Robert. E.
  7. Journal of Chemical and Engineering Data v.22;28 no.1(Jan) Electrical Conductivity of Concentrated Lithium Bromide Aqueous Solutions Fried, I.;Segal, M.
  8. Korean Journal of Air-Conditioning and Refrigeration Engineering Summer Conference N$H_3$ Concentration Prediction from N$H_3$/$H_2$O System by Conductivity Measurements Eun, H. -C.;Jeong, S.-N.;Kim, Y.-J.;Nam, J.-H.;Koo, K.-K.;Jeong, S.;Jeong, E.-S;Kim, B.-J.
  9. Desktop conductivity meter Instruction manual
  10. International Journal of Refrigeration v.24 Testing of crystallization inhibitors in industrial LiBr solutions Dirksen, James A.;Ring, Terry A.;Duvall, Kristin N.;Nathalie Jongen
  11. Journal of Molecular Liquids v.73-74 Conductivity Study of NaCl and NaI Solutions in Water-2-Butoxyethanol Mixtures at 298.15K. The Effect of Ion Pairing on the Standard Dissolution Enthalpies of NaCl and NaI Henryk, P.;Mariola, T.;Adam, B.;Adam, S.
  12. Journal of Electroanalytical Chemistry v.452 Conductivity properties and potentiometric studies of NaBr solutions in mixtures of water with propan-2-ol at 298.15K Jerzy Gregorowicz;Adam Bald;Adam Szejgis
  13. J. Solution Chem. v.15 Kay, R. L.;Broadwater, T. L.