A transport refrigeration system used to control enclosed
areas, such as the box used on trucks, trailers, containers, or
similar intermodal units, functions by absorbing heat from
the enclosed area and releasing heat outside of the box into
the environment. To accomplish this, a typical transport
refrigeration unit requires a highly pressuriZed refrigerant is
introduced into a loW pressure environment such as an
evaporator coil. The refrigerant absorbs heat from the box
return air across the evaporator coil and boils and evapo
rates. This refrigerant vapor is removed from the evaporator,
and is compressed to a higher temperature and higher
pressure through the use of a compressor, and is then turned
back into liquid refrigerant by passing through a condenser.