Abstract
In the last few years many new refrigerant-absorbent pairs have been proposed for used in heat transformers. Water-Xylitol mixtures are examined in the present paper. The experimental work on water-xylitol mixtures consists of measuring pressure-temperature-concentration data at saturation conditions to trace the whole P-T-X chart. In addition, the specific heat and kinematic viscosity are measured at various concentrations and temperatures. Measurements of specific heat are effected by means of a heat flux calorimeter in the range of temperatures between 313 and 373 K and in the range of concentrations between pure water and saturated solutions. Measurements of viscosity are obtained by means of an Ubbelohde viscosimeter, in the range of temperatures between 273 and 353 K and in the range of concentrations between pure water and saturation. The results from the P- T- X chart verify that the maximum attainable temperature difference between external fluids connected with the engine would be within the range of 5–10 K. Thus, it is concluded that water-xylitol solutions are not suitable for applications in the field of heat transformers and absorption machines.
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