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air con - real question

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jorgen.nielsen(at)mweb.co
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Posted: Fri Feb 24, 2006 9:47 am Post subject: air con - real question

Has anyone ever stripped down the components of the air con system?  I can

accept that its not a great system, but I don't seem to get air flow through

it.

 

Lots of cool air would be good, but even warm air blowing on me would be

better than no air!

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RAMPEYBOY(at)aol.com
Guest

Posted: Fri Feb 24, 2006 9:52 am Post subject: air con - real question

OK I don't really know anything about jets, or  systems, but I'll throw in my 

2 cents worth. Does the jet have a 110V AC power  supply while in the air? If 

so, could you not strip down a $100 window unit AC  like used in a house, 

reconfigure/reshape it so it will fit into whatever  baggage space you have? 

Maybe replace the existing AC unit, and hook up to  existing duct work? How 

ridiculous of an idea is this?

Boyce

already laughing at the idea....

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Ernie

Joined: 11 Jan 2006
Posts: 513

Posted: Fri Feb 24, 2006 10:14 am Post subject: air con - real question

The L-29 air conditioning unit is a turbo-cooler design. Hot bleed air

fromthe compressor is sent through a diverter/mixer valve, one side of

the diverter valve goes straight into the cockpit to provide heat, the

air is turned on by pushing the cabin pressurization valve on. The

other side of the diverter valve goes through an air2air heat

exchanger to pre-cool the hot bleed air, the output of the heat

exchanger goes through a turbine. The act of turning turbine expends

enrgery and thereby cools the air. then it is mixed with the hot side

from the diverter valve to regulate the air temp. The diverter valve

is controlled by the 3 position switch in the cockpit, cold diverts

all air to to the heat exchanger, hot bypasses the heat exchanger, and

automat controls the diverter valve based on the thermostat in the

cokpit, mixing the hot and cold bleed air to the desired temp.



There are 2 major problems with the system. First the heat exchanger

relies on RAM air in order to cool the hot bleed air, when the jet is

stationary the heat exchanger does nothing due to lack of RAM air. The

second issue is that the cooler turbine is too small to really cool

the air sufficiently to work in extreme temps. A larger turbine cannot

be fitted (Like the L-39 unit) because the M-701 doesnt have

sufficient excess bleed air capacity to turn anything larger and still

maintain combustion pressures.



I have worked on and off on a 24v powered auto air compressor, but

this also has its limitations. There is very little room in the nose

compartment for a sufficient size condensor. There is no good place to

place an decent size evaporator in the cockpit, and there is no easy

way to deal with condensation in the cockpit, so you would end up with

a whole lot of water in the belly.



I experimented with a marine type refrigeration 24v compressor but it

didnt have the capacity required for cooling. I may try again with a

24v syncronous motor which may have the required torque to turn the

compressor, but power draw will be on the order of about 60 amps.

Plumbing through the pressure vessel is also an issue which needs

resolution.



Ernie



On 2/24/06, RAMPEYBOY(at)aol.com <RAMPEYBOY(at)aol.com> wrote:

 	  Quote: 	
		   



 OK I don't really know anything about jets, or  systems, but I'll throw in my

 2 cents worth. Does the jet have a 110V AC power  supply while in the air? If

 so, could you not strip down a $100 window unit AC  like used in a house,

 reconfigure/reshape it so it will fit into whatever  baggage space you have?

 Maybe replace the existing AC unit, and hook up to  existing duct work? How

 ridiculous of an idea is this?

 Boyce

 already laughing at the idea....

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jorgen.nielsen(at)mweb.co
Guest

Posted: Fri Feb 24, 2006 2:56 pm Post subject: air con - real question

Comprehensive answer Ernie!



OK so no easy answers re the aircon.  I remember you were experimenting.



Regarding airflow, when the aircon is running, cool or hot, can you actually

feel any type of breeze in the cockpit?



 



--

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ainut(at)hiwaay.net
Guest

Posted: Fri Feb 24, 2006 4:07 pm Post subject: air con - real question

Or is there anyplace one can attach an automotive type compressor? 

Shaft speeds on the engine, of course, are out of the question.



David M.

RAMPEYBOY(at)aol.com wrote:



 	  Quote: 	
		   

 

 OK I don't really know anything about jets, or  systems, but I'll throw in my 

 2 cents worth. Does the jet have a 110V AC power  supply while in the air? If 

 so, could you not strip down a $100 window unit AC  like used in a house, 

 reconfigure/reshape it so it will fit into whatever  baggage space you have? 

 Maybe replace the existing AC unit, and hook up to  existing duct work? How 

 ridiculous of an idea is this?

 Boyce

 already laughing at the idea....

- The Matronics L29-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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