Water quality diagnostic method, water quality diagnostic apparatus and water heater system

摘要

A water quality diagnostic method performed by a water quality diagnostic apparatus (100) for diagnosing the quality of water flowing through a heat exchanger, characterized in that, in the first step, calcium ion concentration, carbonate ion concentration, hydrogen ion concentration, water temperature, Measure the value of dissolved ion concentration that reacts to form a sparingly soluble salt. In the second step, using the measured values of calcium ion concentration, carbonate ion concentration, hydrogen ion concentration and water temperature, the supersaturation coefficient of calcium carbonate in the solution is calculated. In the third step, corrected corrected supersaturation coefficient is calculated from the supersaturation coefficient by using the dissolved ion concentration value which reacts with the measured calcium ion to form a hardly soluble salt. In the fourth step, water quality is judged from the calculated corrected supersaturation coefficient.