Currently, retort heating is one of the main technologies employed
for producing processed foods, which can be stored for long periods at
room temperature. There is a strong demand for retort food from
consumers as emergency food because of their long shelf life and ease
of consumption; furthermore, such foods are popular as everyday
food. However, retort sterilization relies on external heating, using hot
water or steam as a heat transfer medium; this results in poor heat
transfer efficiency and, consequently, considerable energy loss.