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Specific heat capacity of LiBr+H2O and LiBr+H2O+TEG solutions at temperatures from 308 K to 343 K and atmospheric pressure.

Number: pap. n. 276

Author(s) : GAO N., HE Y., CHEN G.

Summary

Water is regarded as an important natural refrigerant, and LiBr+H2O or LiBr+H2O+glycols solution plays an important role in the absorption refrigeration systems and dehumidification cooling. Isobaric specific heat capacity (Cp) of LiBr+H2O and LiBr+H2O+triethylene glycol (TEG) solutions are presented in this context. The measurement is run on a Calvet calorimeter in this work. The calorimeter consists of two vessels of the same size in an isolating chamber surrounded by heating elements, and operates with temperature precision of ±0.05 K and calorimetric precision of ±0.1%. Firstly, Cp of LiBr+H2O solution is measured at temperatures from 308 K to 343 K, and P=0.1 MPa, and the mass fraction of LiBr+H2O solution ranges from 20 % to 60%. The results are analyzed and compared with the values of previous articles by other authors, and permit to conclude that the Calvet calorimeter we used is capable of accurate measurements of Cp of liquids. In addition, Cp of LiBr+H2O+TEG (LiBr/TEG mass ratio = 0.5) solution is measured at temperatures from 308 K to 343 K and atmospheric pressure, and the absorbent concentration ranges from 30% to 70%. Finally, the measuring data is correlated and a universal Cp formula is obtained as a function of temperature and composition of LiBr+H2O or LiBr+H2O+TEG solution by a least-squares method. The correlation formulas give satisfactory accuracy for most engineering-design calculations.

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Details

  • Original title: Specific heat capacity of LiBr+H2O and LiBr+H2O+TEG solutions at temperatures from 308 K to 343 K and atmospheric pressure.
  • Record ID : 30004639
  • Languages: English
  • Source: 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Publication date: 2012/06/25

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