How is the APU cooled?

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Multiple Choice

How is the APU cooled?

Explanation:
The APU is cooled primarily by an air/oil heat exchanger. Hot oil that lubricates and helps cool the APU is pumped through an oil cooler where it transfers its heat to incoming air. The air, often moved by a dedicated fan or by ram air through ducts, carries the heat away and the cooled oil recirculates back into the unit. This method is simple and effective for the compact, high-demand environment of an aircraft APU. Other cooling methods like a water jacket or a vapor-cycle cooler add weight and complexity and aren’t typical for APUs, which is why the air/oil cooling approach is used.

The APU is cooled primarily by an air/oil heat exchanger. Hot oil that lubricates and helps cool the APU is pumped through an oil cooler where it transfers its heat to incoming air. The air, often moved by a dedicated fan or by ram air through ducts, carries the heat away and the cooled oil recirculates back into the unit. This method is simple and effective for the compact, high-demand environment of an aircraft APU. Other cooling methods like a water jacket or a vapor-cycle cooler add weight and complexity and aren’t typical for APUs, which is why the air/oil cooling approach is used.

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