Refrigerated Trailers and A/C Systems

Although they operate on the same principles as other air-conditioning (A/C) systems, refrigerated trailers utilize a far more sophisticated ____ ___________ than a regular vehicle. One major difference between an A/C system and a truck-trailer refrigeration system is that heating is a __________ ____________ of a transport refrigeration system.

Modern _______ ___ _____ ______ primarily operate through the use of a heat exchanger where older 'refrigerated air' is used to cool incoming fresh air as it is vented from the reefer.

Many reefers can be divided into different compartments or zones through the use of specially constructed _________ _________. This enables the simultaneous transportation of different types of perishable goods within the same reefer.

The cooling capacity of a particular reefer is dependent on a number of factors, including its ____________, the size of the ______, the ________ it is designed to carry, whether it will carry varied product in different _______ _____, and whether the cargo must remain ______ __ _________ ________

_____ ____________ is a major contributor to cargo deterioration during transportation.

Most reefer cooling units are driven by a _____ ______ ______ Modern units are required to have modern emissions systems for auxiliary power units (APUs), common rail (CR) fuel systems, _______ ___ _____________ (EGR), and ______ ___________ _______ (DPFs).

The compressor performs two functions: it _______ ___ ________ _________ to facilitate the 'change of state' required for operation of the system, and it _____ ___________ through the system to carry heat absorbed from the evaporator to the condenser.

Along with the vehicle's A/C system, the refrigerant is the _______ of trailer refrigeration. It is responsible for absorbing heat from the inside of the _________compartment and releasing it to the air outside the compartment from the condenser.

The system is effectively divided into two sides by the __________ and the _________ _____. The ____ ________ side is the part of the system between the compressor outlet and the expansion valve inlet, and the ____ ________ side is the part of the system between the expansion valve outlet and the compressor inlet.