LIQUID COMPOSITION MEASUREMENT DEVICE AND LIQUID COMPOSITION MEASUREMENT METHOD FOR ABSORPTION REFRIGERATOR

The purpose of the present invention is to stably operate an absorption refrigerator. This liquid composition measurement device 65 is for measuring the liquid composition of a liquid mixture used in an absorption refrigerator 1 comprising: a regenerator 10 that uses, as a three-component type working medium, a liquid mixture of water, lithium bromide, and 1,4-Dioxane and heats and evaporates the working medium; a condenser 20 for cooling and condensing the steam mixture evaporated by the regenerator 10; an evaporator 30 for vacuum evaporating the liquid mixture condensed by the condenser 20 and obtaining cold energy using the heat of vaporization of the liquid mixture; and an absorber 40 for causing lithium bromide to absorb the steam mixture generated by the evaporator 30. The liquid composition measurement device 65 has a first measurement unit 651 to third measurement unit 653 for measuring m − 1 different types of physical properties, and the liquid composition measurement device 65 calculates the liquid concentration or liquid composition of the working medium, which has m types of liquids mixed therein, on the basis of the m − 1 different types of physical properties measured by the first measurement unit 651 to third measurement unit 653.