Low Cost Air Conditioning for your Aircraft  
                                $165
Finally some affordable relief from the unbearable heat and greenhouse effects
of large windows and a small cabin.  This project provides instantaneous relief
with an immediate 20 degree or better drop in temperature of the air stream
passing thru its radiator. Power consumption is <15 watts.  The cooler will hold
several pounds of ice that is progressively melted via a circulating water to air
loop heat exchange.  Of course the operating time is not unlimited like
automotive refrigeration systems, but it can provide more than an hour of
continueous relief in otherwise oppressive environment.


Air Conditioner ---Bill Of Materials

Mechanical Components
664-AD0812UB-A73GLLF ADDA 50CFM
Brushless Fan 80mm 12VDC     
Pump 50JR-150LV  Jeir Fountain Pump  
Black Ice Micro Radiator
 3x4x2 radiator
1/4” NPT right angle to 1/4” hose bib fitting (2)
EL 1414        EL 1414 P      
1/4” Tygon tubing  ~12”  
Coleman Flip Lid 6 Personal Cooler
r
1/8" ABS Radiator and Fan Mounting
L/R Shells
1/
16" ABS vacuum formed PC board enclosure
4 ea #4x1/2" sheet metal screws
8 ea #8 x 3/8" sheet metal screws


Pump drive electronics
H Bridge Motor Driver  579-MTS2916A-HGC1   
74C74   DUAL FLIP FLOP
LM555 TIMER
LM 78L05  + 5V REGULATOR
SPST SWITCH
.001 UF CAPS (2)
0
.1UF CAP
10 UF TANT CAP (2)
RESISTORS 1/4W
1 OHM
1K
22K
68K
56K
PC BOARD --BARC
DC power cord with Jack
panel mount DC  Power Socket

Price $165
Use and Operation
Load the cooler with ice cubes and add ~ 1” of chilled water to submerge the pump. Mount the
AC unit in the rear of your plane (hat shelf or the baggage clothes hook) Connect to aircraft
12-volt power and turn it on.  The pump will circulate cold water thru the radiator and return it
back over the ice.  The fan provides that welcome stream of cold air. Operating time is is of
course, temperature dependent, but you can expect up to an hour or more of cool air before
melting all of the ice.  Ice takes 80 calories per gram to convert  from 0 degree C ice to           
0 degree C melt water (32 degree F). This energy adsorption or release is called the heat of
fusion. Each additional degree of temperature change requires only 1 calorie per gram per
degree. Thus the bulk of the cooling capacity is stored in the melt phase transition of the ice.  
I have found that filling the cooler case with ice cubes has been sufficient for my type of flying.
It has been most comforting in getting me from the hangar, down the taxiway, and a climb to
cooler altitudes. I have usually had sufficient remaining ice for the decent back into the hotter
air near Earth.
Air Conditioner Kit Build Instructions      
              Click Here