INSTRUCTION MANUAL FOR (SANITIZED) THERMOELECTRIC GENERATOR

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001200080004-8
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 38
• Document Creation Date: December 22, 2016
• Document Release Date: February 13, 2012
• Sequence Number: 4
• Content Type: MISC

Declassified in Part - Sanitized Copy Approved for Release 2012/02/13: CIA-RDP78-03424A001200080004-8
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Tio4X3AE'l UCTION MANUAL FOR
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OELECTRIC GENERATOR
ORIGINAL CL Byls
0 REVW ON
EXT BYFb6 YRS
REASON
DESCRIPTION OF THE GENERATOR
Th Thermoelectric Generator incorporates 99 pairs of elements
arranged In layers radially about a central core containing the heat
source.
The thermoelectric elements are cylindrical ingots of lead telluride
material, doped to produce N and P.type semiconductors. One N and one
P type element constitute a couple, and the 92 couples are connected
electrically in series.
Each couple is joined at the hot junction end by a metal shoe. The
elements are individually spring loaded at the cold junction ends to
insure law resistance electrical contact at the hot junctions and to
insure good heat flaw through the parallel paths from the heat source
to the outside radiator.
Electrical insulation is provided at the hot and:cold 'junctions to
insulate the couples from each other and the container.
The container functions as the heat sink. Its metalfins enable the
generator to operate more-efficiently at room ambient temperature.
A propane burning, radiant-type burner is used as the het source.
Sensing thermocouples are assembled into-hot and cold junctions to provide
a means of measuring the temperature drop along the elements.
AUXILIARY EQUIPMENT
Attached to the generator itself is? a needle valve and small pressure
gauge for adjusting the fuel flow input. There is also an indicating
meter for the hot junction temperature. In addition the following
accessories are provided:
1. A small self-contained propane bottle with regulator
and a short hose.
2. A longer hose with regulator for direct attachment for a
larger (100 pound) tank of propane.
CONR
DENTAL
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There are several more sensing thermocouples accessible by removing the
cover on the output junction box. The location of these thermocouples
are indicated in the attached drawings.
STARTING INSTRUCTIONS
To Start:
1. Remove the stack cover by unscrewing the knurled nut at
the top of the generator.
2. Connect the appropriate hose to the gas input and open
tank valve.
3. Open regulator until approximately 16 psi is indicated.
4. Open the needle valve until a pressure of 14.5 is in-
dicated on the small gauge mounted on the needle valve
assembly.
5. Ignite the burner (preferably with a flint igniter).
View down the stack will show a blue flame around the
burner head.
6. After burning for approximately one to two minutes, the
flame should "pop" into the combustion tube. Proper
burning will be characterized by a "gurgling" sound.
If the characteristic sound is not heard, re-ignite.
CAUTION - Do not look down stack unless wearing glasses
after initially lighting.
7. When proper burning has been established and the tem-
perature indicating meter approaches to within 1000F
of the desired hot junction running temperature, close
down on the generator needle valve to adjust the hot
junction temperature to the desired point, As a guide,
3.8 psig-10500F operating with a matched load.
CAUTION - Under no circumstances exceed 1100?F hot
junction temperature.
TO RUN
14. Hot junction temperature,and consequently the power output,
is a variable function of the fuel input to the generator
as shown by the gas pressure entering the burner. The
electrical load attached to the output of the generator
will also affect the hot junction temperature however,
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so that whenever the generator is run open circuited or
used with an electrical load, other than 12 volt batteries,
it will be necessary to re-aajust the needle valve to keep
the hot junction temperatures at the proper operating
points. It is recommended that for a long term operational
testing this generator should be run at a hot junction
temperature of 1050?F? or less. The generator can be run
for shorter periods up to 1100?F and momentarily at
temperatures as high as 12 or 1300?V.
Under standby conditions the fuel input can be reduced to
as little as of the full input thereby operating the
hot junction temperatures at around 400?F, with no adjust-
ment to the burner other than cutting down the operating
pressure by means of the needle valve. To switch back
and forth between standby conditions and full power output,
a dual set of needle valves could be installed in parallel
such that one would merely adjust each needle valve for
the proper flow rate and then switch back and forth between
the two by means of either a manual switch or a automatic
solenoid control.
The temperature indicating meter is connected to a small gauge thermo-
couple attached to one of the hot junction contacts within the generator.
Since this thermocouple is a small gauge size, to prevent heat loss
along the thermocouple leads from the hot junctions, there is the danger
that this lead will becomecbffective with long time operation. It is
suggested that all of the thermocouple leads (enclosed in the terminal
box) be hooked up to a tensiometer circuit upon initially receiving
the generator, letting the generator run under normal conditions and
take a complete set of temperature readings from all of the thermo-
couples. Thereafter, one can always recheck the relative tempera-
tures of all of the thermocouples to make sure that no one thermo-
couple lead wire has become defective.
TO STOP
1. Close off the valve, the main fuel tank, and allow the
remaining gas to bleed from the lines.
2. Close all valves.
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Declassified in Part - Sanitized Copy Approved for Release 2012/02/13: CIA-RDP78-03424A001200080004-8
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BATTERY CHARGING TEST
A thermoelectric generator was used to charge a 12 volt storage
battery. The following is an outline of the test and its results:
Generator used:
Battery used:
Measured quan-
tities:
Conditions of
the test:
Measurement
Techniques:
Calculated Re-
sults:
thermoelectric generator-propane
10 Sonotone15 ampere.-hour nickel-cadmium cells
connected in series.
time, battery voltage, charging current, gas
consumed.
The battery was completely discharged. The genera-
tor was started and run at 1050?F for about one
hour to stabilize the generator. A resistance
load which drew 0.6 amps was used during this
warm-up period. The test was conducted in the
laboratory, with an ambient temperature of about
75?F.
The battery voltage was monitored continuously
by means of a recorder. The charging current and
gas consumed were measured hourly. To measure
the gas consumed by the generator, the propane
bottles used were weighed on a heavy duty platform
balance. The graphs show the battery voltage,
charging current, and gas consumed as a function
of time.
Gas consumption rate:
m = 183 g/hr
Chemical power input to generator:
Pin = 255 watts
(Based on a high heating value for propane
of 13.5 w-hr/g)
Average charging current:
Iav = 0.57 a
Average battery voltage:
Eav = 13.9 v
Average power delivered by the generator:
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Declassified in Part - Sanitized Copy Approved for Release 2012/02/13: CIA-RDP78-03424A001200080004-8
Pout = 7.92 watts
Efficiency:
= 3.1% ?
Ampere-hour input to battery during the 9-hour
test:
It = 5.13 ah
Gas consumed to charge batteries to 100% of
nominal (5 ah) capacity:
M 162g
Estimated gas consumption to charge batteries to
140% of nominal (5 ah) capacity:
Mt == 230g
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TO SERVICE BURNER
In the event excessive pressure is necessary to reach operating tem-
perature, check the orifice. In the orifice spare parts envelope is a
clean-out tool, along with two spare orifices.
To remove the burner assembly from the generator:
1. Remove stack cover by unscrewing knurled nut,
2. Loosen the weather cap by loosening the small Allen set
screws at the bottom of the supporting legs.
3. Lift weather cap free and remove burner.
4. Remove burner mounting band and unscrew needle valve
assembly from the mixing tube.
S. Orifice may now be removed for cleaning or replacement.
Flame screens may also be replaced by unscrewing the
burner head from the feed-in tube. The flame screen is
held in place by the feed-in tube.
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CONFIDENTIAL- ,
PERFORMANCE SPECIFICATIONS
Voltage, open circuit
Voltage matched load
Current, matched load
Temperature, hot junction
It
cold junction
stack gas
Power oupput
Fuel input
Power to fuel ratio
Thermal efficiency
Net efficiency
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WEIGHTS
Generator assembly without burner
Burner assembly including gauge and valve
Generator case and terminal box
Fuel supply unit
Full bottle of propane
CONFll ENT
A
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4101101111
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0?1?011
AM.
26.0 V.D.C.
130 V.D.C.
645 ma.
1100?F
160?F
340?F
8.56 watts
18.68 gm/hr.
208 watt-hr/#fuel
5.8 %
3.3 %
10# - 9 oz.
- 4 oz.
5#
6# -12 oz.
2#
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