Comparison on condensed method and heating method for measuring steam dryness

Measured dryness of saturated steam plays an important role in the thermal efficiency and safety of conden- sing turbine. Based on the principle of the steam dryness measurement with condensed method and heating method, the error formula of the steam dryness measurement was deduced, the sources of the measurement error in two methods were analyzed, the key factor of affecting the measurement error was compared. Finally, the measurement error of two methods in different dryness of wet steam was given and compared, and the best range of dryness of two methods was determined.