Vapor pressures, densities, and viscosities of the (water plus lithium bromide plus sodium formate) system and (water plus lithium bromide plus potassium formate) system

Measurements of thermophysical properties (vapor pressure, density, and viscosity) of the water + lithium bromide + sodium formate system (LiBr:CHO2Na =2:1 by mass ratio) and the water + lithium bromide + potassium formate system (LiBr:CHO2K =2:1 by mass ratio) were measured. The system, a possible new working fluid for absorption heat pump, consists of absorbent (LiBr + CHO2Na) or (LiBr + CHO2K) and refrigerant (H2O). The vapor pressures were measured in the ranges of temperature and absorbent concentration from 293.15 K to 343.15 K and from 20.0 mass % to 60 mass %. The experimental data were correlated with an Antoine-type equation. Densities and viscosities were measured in the same range of temperature and absorbent concentration that vapor pressure. Regression equations for densities and viscosities were obtained with a minimum mean-square-error criterion.