Mr Spaceman From Canada, joined Mar 2001, 2786 posts, RR: 9 Posted (10 years 6 months 2 weeks 1 day 20 hours ago) and read 4095 times:
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.)
Erj-145mech From United States of America, joined Oct 2001, 306 posts, RR: 1 Reply 1, posted (10 years 6 months 2 weeks 1 day 13 hours ago) and read 4012 times:
You are correct in your assumption that the heat exchangers are in the wing center sections. The majority of the King Airs fuel is housed in the engine nacelles and outer wing panels. There are aux tanks in the portion of the center section, between the two wing spars. Also, the main battery is located in the right wing center section.
Mr Spaceman From Canada, joined Mar 2001, 2786 posts, RR: 9 Reply 4, posted (10 years 6 months 1 week 6 days 18 hours ago) and read 3918 times:
Hello Aaron atp.
Have no fear.
I wasn't going to ask if there was also air cycle machines, mix manifolds, Hepa filters, etc, located in the wings.
However, I'm am a bit curious about whether or not King Air 200's have Catalytic Converters (like airliners do), between the engines and cabin to eliminate the high levels of ozone in the bleed air while cruising along in the upper flight levels.
Lstc From Canada, joined Jun 2003, 320 posts, RR: 0 Reply 5, posted (10 years 6 months 1 week 5 days 22 hours ago) and read 3904 times:
Nope. Ozone elimination is not a FAR 23 requirement. By the way, the picture of the AUX tanks you provided is a bit ambiguous. The AUX tank filler cap is the red cap on the wing. The nacelle tanks are in the forward portion of the hump in the picture. The aft portion is empty.
You AUX fuel is unusable unless you have fuel in the mains, as a jet pump driven by main tank fuel flow is used to draw fuel from the AUX tank.
Another strange characteristic of the heating system, is that the bypass valves operate in "series". That is temperature control operates one valve until it reaches its extreme, then operates the other valve. And of course...there is no ACM. So you can't get cooling out of the bleed air, just heating.
The King Airs use vapour cycle air conditioning for cooling. You can see the vents for the evaporator in the nose.
Lstc From Canada, joined Jun 2003, 320 posts, RR: 0 Reply 8, posted (10 years 6 months 6 days 14 hours ago) and read 3825 times:
Yes. The 1900 does have ACMs. The 90s, 100s, 200s, and 300s do not. I don't think the 1900 is really considered a "King Air" is it? Although we do know the relationship, the type certificate calls it a model 1900 "airliner".