Here's a little info about the Raytheon/Beechcraft King Air 200 turboprop that is related to my question.
It has a pressurized, climate-controlled cabin. The cabin is pressurized using engine bleed air and can maintain a maximum pressure differential of 6.1 PSI. It has Pratt & Whitney PT6A engines.
It's all-engine service ceiling is 35,000 feet, and it's single-engine service ceiling is 19,150 feet.
Armed with the knowledge I have (thanks to you guys ) about how engine bleed air has to be cooled before entering the cabin via AC heat exchangers, I feel it's safe to assume that the inlets located on the leading edge of the King Air's wings - between the engine & fuselage - are ram air intakes for cooling the aircraft's heat exchangers.
I'm used to knowing that AC pack heat exchangers are usually located in an airliner's fuselage near the main landing gear bays, and the wings are full of fuel.
So my question is ........ If these wing LE inlets are for heat exchangers, how big are the exchangers, and how are they mounted in the wings? Is it a simple matter of "small" heat exchangers that are located between the wing's fuel tanks?
Here's the inlets (between the engines & the de-icing boots.)
Photo © TZ Aviation
In this belly shot you can see the air exaust vents on the underside of the wings directly aft of the intakes.
Photo © Ivan Coninx