This program is HAD-CR_T, a program for calculating the natural circulation ratio of a detailed water tube boiler. The results of each pipe and section show the variation of the water / steam quantity, velocity, and property of each section, the circulation ratio, and the pressure drop, and the variables of the two-phase fluid and critical heat flux for each section can be calculated. You can get detailed values ​​for the conditions inside each pipe and tube. You need to know the number of pipes in the clockwise enclosure, the start and end points to connect pipes, and information about pipes and tubes.