In Figure 19, The relation between the time of production and the thickness of tubular ice, when compared with before and after installation of heat exchanger. As shown in Fig.19. Considering that the thickness of the tubular ice at 12 mm to find the time of production tubular ice before and after installation of the heat exchanger is equal to 36.0 minutes and 33.25 minutes, respectively. The production time per cycle decreased by about 2.75 minutes.