Mechanical systems also have condensers. Condensers are found
underneath steam turbines. Air-conditioning systems have
condensers too.

How this name came about is a mystery to me. Perhaps it is
because the condenser is the place for converting vapor or
gas into liquid - at least for mechanical systems.

So it is a kind of heat exchanger. What is the cooling medium?

For air-conditioning systems, the most common cooling medium
is water and air. The vapor to be cooled is the refrigerant.
And you've guessed it... It changes hot refrigerant gas into
liquid.

When it does that, heat energy is removed from the refrigerant.
The heat gets transferred to the cooling medium.

Actually that's how heat is removed from air-conditioned space.
The heat from a building is transferred to the refrigerant
through cooling coils. This heat is then transferred to the
condenser. The heat is then transferred to the cooling medium.
The cooling medium finally transfers the heat to the admosphere
or to the sea.

Of course, there are many other components in between to make
the system work.

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