[simpits-tech] How do you deal with temperature inside the pit?

Craig Rochester simpits-tech@simpits.org
Thu, 28 Nov 2002 20:36:39 -0500 

Hi Albert,

A portable unit would be fine.  I had thought of suggesting this, but they
cost about twice as much as a window unit.  The picture is misleading as it
doesn't show the flex-hose that connects to the back.  The only real
difference is that the portable unit  and a window unit, is that the
portable is built to connect a flex hose duct to the back and blow the heat
somewhere else(hopefully outside).  See here:
http://www.coolestspot.com/products/coolit2000main.shtml

You could simply modify a cheap window unit($200US vs. $400US new) to do the
same thing.  Some sheet metal, a duct collar, and a flex hose (about $20US)
and you've got the same thing.  For refrigerant cooling, you're using
electricity to move the heat from one place to another and it takes energy
to do that: about 1kW to move 2kW of heat.  That means the energy to move
the heat(cool) adds heat to the room.  The heat from the compressor and fan
motor is blown out the back of the unit.  So why couldn't you just point the
flex-hose toward the window(or door)?  No changes to the window would be
required.

As far as cost, there's no free lunch (1st law of thermodynamics).  A 1 kW
unit will use about 1/2 kW per hour of electricity .  Where I live that's
about  $0.05US an hour to operate.

Craig R.

-----Original Message-----
From:	simpits-tech-admin@simpits.org [mailto:simpits-tech-admin@simpits.org]
On Behalf Of Albert Yung
Sent:	Wednesday, November 27, 2002 1:13 AM
To:	simpits-tech@simpits.org
Subject:	Re: [simpits-tech] How do you deal with temperature inside the pit?

Craig,

I think the duct in the F16 is located between your legs infront of the
ejection handle. not sure if there are any others...I am sure there are. I
have follow up your question to a few F16 crew chiefs I know from my VFW.
Hopefully they will come online and give me some good info in a few hour's
time.

I think its very clever to use the Air Cond. panel to actually controls the
air float inside the pit. Another boost in realism. Why didnt I thought of
that before??

Craig, on another note, I would like to hear your opinion on these portable
I have found.

http://www.gasmart.com.au/html/dimplex_.html

Its not as good as a window mount system. However, it can save me a hell of
a lot of installation, breaking the window and security bars. Plus not have
to worry kids vendalising something half stuck out the window. The cost of
them is only a few hundred dollars Australian more compare to a window mount
system. The flat I live in now its my parents, and they are concern with
electric bills associated with an air conditioner despite the fact now that
I work and can pay for a little addition to living standard...they are just
old school. Instead of trying to convince them and break the wall. I thought
I will go ahead and use this system to allow me to unplug the air
conditioner from the pit and take it into my folk's bed room on a very hot
night to give them better sleep. I think the concept would be the same like
you mentioned before, build a shrud around the outlet and feed the cool air
into the cockpit.

Cheers,

Albert
Sydney, Australia


----- Original Message ----- e
From: "Craig Rochester" <johncraigroch@msn.com>
To: <simpits-tech@simpits.org>
Sent: Wednesday, November 27, 2002 1:56 PM
Subject: RE: [simpits-tech] How do you deal with temperature inside the pit?


> Hi Rod,
>
> Sounds like you have a well thought out plan.  That's a good idea to cool
> the panel and monitors with ventilation and having  the A/C for the
interior
> separate.   The "mixing box" for modulating the A/C temperature is
perfect.
> You'll get a nice, even supply temperature without the cycling on/off with
a
> thermostat type control.
>
> I've done a little searching for info on the F-16's A/C and found this
link
> for the "F-16C Air Conditioning Panel":
> http://home.att.net/~sfinger/F16aircond.htm
>
> Any idea what RAM, DUMP, and NORMAL - AIR SOURCE means?  Am I correct in
> assuming the left dial is a proportional control like on a car?  Anyone
know
> where the ducts and/or nozzles are in a jet?
>
> Craig R.
>
> -----Original Message-----
> From: simpits-tech-admin@simpits.org
[mailto:simpits-tech-admin@simpits.org]
> On Behalf Of Rod Dale
> Sent: Wednesday, November 27, 2002 12:17 PM
> To: simpits-tech@simpits.org
> Subject: Re: [simpits-tech] How do you deal with temperature inside the
pit?
>
> The thermosensor normally sits in or near the air exhaust outlet in the
> cockpit. Most I've worked on have this outlet in the rear bulkhead behind
> the seat somewhere.
> I'm going to duct my room aircon in/out of my F-111 as per Craig's
diagram.
> The outlets will be - 2 eyeball types in the centre overhead beam assy and
> one in each footwell (pilot and nav). These will have small PC power
supply
> type fans in them to force the air out. I'm planning on making a servo
> controlled valve to allow more\less cool air in. This air will mix with
the
> ambient room temperature and hopefully make it reasonably comfortable. The
> servo will be controlled from the F-111 Aircon panel.
> To cool the monitors I plan to have an exhaust fan in the front that will
> draw the hot air out from behind the instrument panel and two vents low
down
> on either side for the incoming room air.
> I'm going to use the cabin pressure gauge as the temperature indicator,
with
> sensor located near the exhaust air outlet.
> When I draw this up I will upload it.
> Rod
>
> ----- Original Message -----
> From: Sean Galbraith <sean.g@paradise.net.nz>
> To: <simpits-tech@simpits.org>
> Sent: Tuesday, November 26, 2002 9:42 AM
> Subject: Re: [simpits-tech] How do you deal with temperature inside the
pit?
>
>
> >
> > >Would someone like to come up with a temperature gauge that shows the
> > >temperature inside the cockpit replacing an engine temp gauge or other
> > >gauge, would that be too tacky?
> >
> > I would imagine that most military pit's would have an A?C panel anyway,
> > with a thermostat in it.  I know the (1970 vintage) A-4k does, midway
down
> > the RH-Wedge panel....  Why not just use that?
> >
> > Sean.
> >
> > _______________________________________________
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