Figure 10 shows the comparison of the thickness of the tubular ice at different times between numerical solution and experimental result. In theory, the thickness of tubular ice will increase when the time has changed. The comparison between the numerical solution and experimental result is that the average error in the production of tubular ice is equal to 28 percent.
The average error values in numerical solution occurred because of setting the thermodynamic properties of ammonia to be fixed and does not depending on temperature. Moreover, the actual operation of the system in the tubular ice. The system is not stable, as well as assumptions set. Thus, the error is high in the initial phase of the ice production process. Since the numerical solution and experimental result is consistent trend. Therefore, it can bring the result of measurement of actual data compared with the thickness of numerical solution.