The refrigerator is a commercial vehicle equipped with an isothermal rear crate. It is used for the transport and distribution of perishable food products (fresh or frozen), therefore these kind of products must remain unchanged throughout the whole journey. Refrigerated trucks are mainly used for the distribution of products intended for supermarkets and shopping malls. In some cases, they can also be used to transport some chemicals that, like food, have the characteristic of maintaining a low temperature.