Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

air con - real question

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> L29-List
View previous topic :: View next topic  
Author Message
jorgen.nielsen(at)mweb.co
Guest





PostPosted: Fri Feb 24, 2006 9:47 am    Post subject: air con - real question Reply with quote

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!


- 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:

http://www.matronics.com/Navigator?L29-List
Back to top
RAMPEYBOY(at)aol.com
Guest





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

http://www.matronics.com/Navigator?L29-List
Back to top
Ernie



Joined: 11 Jan 2006
Posts: 513

PostPosted: Fri Feb 24, 2006 10:14 am    Post subject: air con - real question Reply with quote

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....




- 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:

http://www.matronics.com/Navigator?L29-List
Back to top
View user's profile Send private message
jorgen.nielsen(at)mweb.co
Guest





PostPosted: Fri Feb 24, 2006 2:56 pm    Post subject: air con - real question Reply with quote

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?



--


- 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:

http://www.matronics.com/Navigator?L29-List
Back to top
ainut(at)hiwaay.net
Guest





PostPosted: Fri Feb 24, 2006 4:07 pm    Post subject: air con - real question Reply with quote

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:

http://www.matronics.com/Navigator?L29-List
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> L29-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group