THERMOPHYSICAL PROPERTIES ANALYSIS FOR AMMONIA-WATER MIXTURE OF AN ORGANIC RANKINE CYCLE
DOI:
https://doi.org/10.11113/jt.v75.5203Keywords:
Organic working fluid, ammonia-water mixture, waste heat recoveryAbstract
In an Organic Rankine Cycle (ORC), the thermofluid properties of the organic fluid are key parameters to achieve an optimum energy recovery. Non-azeotrapic fluid, such as ammonia-water mixture is suitable for applications in low grade heat source because of the thermodynamic characteristics of this fluid. This paper reports experimental data of thermal conductivity and dynamic viscosity of ammonia-water mixtures that will be used for ORC application. Five ratios of ammonia to water concentration were tested which are; (1) 25:75, (2) 20:80, (3) 15:85, (4) 10:90 and (5) 5:95. These five mixtures are characterized at a temperature range from 25ºC to 40ºC. The result shows that the thermal conductivity increases as the concentration of the ammonia reduces. The thermal conductivity also increases as the mixture temperature increases. The ammonia-water mixture at the ratio of 5:95 gives the highest thermal conductivity at 40ºC which is 30% better than the other concentrations at similar temperature. The dynamic viscosity,  and heat capacity,  of these mixtures shows a linear relationship to ammonia molar concentration. Â
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