The is also a kind of heat exchanger, which is a direct device to obtain cold air in the refrigeration cycle. Its shape is similar to that of a condenser, but it is narrower, smaller, and thicker than the condenser. The evaporator is installed behind the instrument panel of the cab. Its structure and installation in the refrigeration system are mainly composed of pipes and radiating fins. There are also water trays and drain pipes under the evaporator.