This device has been designed
(with a relatively low volume compared with heat exchange surfaces)
to allow the flow of heat from a fluid at a higher temperature to
another fluid at ambient temperature.
Resistive divider
This is an electrical device
which allows the variation of the output voltage, the same as the
input voltage, by altering the number of resistances in series which
the electrical current passes through via a special control. It
is usually used to alter the speed of a connected consumer motor.
Recirculation
This function of the ventilation
system makes it possible to recirculate the same air in the passenger
compartment, preventing the intake of outside air. It is a very
useful function because it makes it possible to exclude undesired
outside air from the passenger compartment (fumes, air which is
polluted from driving in traffic).