Properly choosing additives to conventional lithium bromide aqueous solution to improve the performance is an important part in lithium bromide absorption refrigeration studies. Mixtures consisting of lithium bromide + triethylene glycol + water, lithium bromide + propylene glycol + water, lithium bromide + sodium formate + water, and lithium bromide + potassium formate + water were thought to be four promising alternatives to lithium bromide aqueous solutions. In the study, heat capacities of the four kinds of solutions were measured using a calvet type calorimeter at temperatures from 308.15 K to 348.15 K. The experimental data were regressed using a stepwise statistical method, and the corresponding equations for each kind of solution were given. The average absolute deviations between experimental and calculated values were no more than 0.12 % for all of the systems.