Conventionally, a refrigerating apparatus configured to cool an inside of a compartment such as a container used for, e.g., marine transportation or a trailer used for, e.g., ground transportation has been known. For example, Patent Document 1 discloses the refrigerating apparatus (trailer refrigerating apparatus) of this type. The refrigerating apparatus includes a casing body attached to an opening of a trailer of a refrigerated vehicle, and a refrigeration cycle unit supported by the casing body. The refrigeration cycle unit forms a refrigerant circuit configured to perform a vapor compression refrigeration cycle. Specifically, the refrigeration cycle unit includes a compressor, a radiator, an expansion valve, and an evaporator. The compressor, the radiator, and the expansion valve are supported by the casing body so as to be positioned outside a cooling compartment (i.e., outside a compartment). The evaporator is supported by the casing body so as to be positioned inside the cooling compartment (i.e., inside the compartment).
An air path is formed inside the cooling compartment (trailer) such that air circulates through the evaporator. On the other hand, when refrigerant circulating through the refrigerant circuit passes through the evaporator, the refrigerant is evaporated by absorbing heat from in-compartment air. In such a manner, the in-compartment air of the trailer is cooled to store food etc.