In: Mechanical Engineering
a frozen ice cream is placed into a container before the freezing process is complete. The container has dimensions of infinite shapes 8, 10 and 12 cm and is then placed in a water blast freezer with a heat conductivity coefficient of 50W / (m2 K). product temperature of -14 degrees centigrade and air temperature of -25 degrees centigrade. product density is 700 Kg / m3, thermal conductivity (frozen) 1.2 W / (m K) and specific heat 1.9 kJ / (Kg K). if latent heat is lost during the 80kJ / kg freezing blast process, make an estimated freezing time ... (kJ / W)