STUDY OF ETHYLENE GLYCOL, PROPYLENE GLYCOL AND ETHANOL BINARY AND TERNARY WATER SOLUTIONS DENSITY

The method of density prediction of multicomponent coolants, those consists of water, monoalcohols and glycols has been proposed. Large amount of empirical data is not required for application of this method. The results of the verification of the proposed model using literature data on density of the water/ethanol, water / ethylene glycol, water / propylene glycol, water / ethanol / ethylene glycol solutions, as well as experimental data on the density of the of water / ethanol / propylene glycol solutions obtained by the authors has been presented in paper. The proposed model presents the experimental data on the density with sufficient for practical using accuracy. The deviations of the calculated values of the density of investigated systems in the temperature range 233-328 K does not exceed 1.0% for solutions, which can be used as coolant in the refrigeration systems. The experimental data on the values of the density of water / ethanol / propylene glycol that was obtained by pycnometric method in the range of 243-303 K temperature has been presented in paper. Error of the experimental data does not exceed 0.2 %. The concentrations of the solutions components were chosen as required for the coolant, which can be used to temperature of minus 40 °C. The model that proposed for prediction solutions density can be recommended for practical application, and can be used for development of new models for prediction transport properties, heat capacity of secondary coolants.