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Thermal conductivity of ammonia-water.

Author(s) : CUENCA Y., VERNET A., VALLÈS M.

Summary

In the last years there has been an increasing interest in energy saving and protecting the environment. Due to these factors the use of NH3-H2O absorption refrigeration systems driven by waste heat or solar thermal energy has been favoured. Many researchers have investigated how to enhance the absorber performance since it is the most critical component in the cycle. To calculate heat and mass flow rates in the absorber it is necessary to know the thermal conductivity of the NH3-H2O. Usually, thermal conductivity of ammonia solutions at different concentration (from 20 to 60%) and at temperatures ranging from 35 to 50°C are needed. Unfortunately, the experimental data available from the literature shows remarkable inconsistencies. In this study, a transient hot wire apparatus was set to measure thermal conductivity of NH3-H2O. The measurements were made with a platinum wire coated with a Teflon insulation layer. The measured values of thermal conductivity were compared with data reported in the literature. The reliability and accuracy of the experimental method was confirmed with measurements on pure water and water-lithium nitrate with well known thermal conductivity values.

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Pages: 8 p.

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Details

  • Original title: Thermal conductivity of ammonia-water.
  • Record ID : 30002753
  • Languages: English
  • Source: 4th Conference on Ammonia Refrigeration Technology. Proceedings: Ohrid, North Macedonia, April 14-16, 2011.
  • Publication date: 2011/04/14

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