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Global Power Technologies
1-5
5120
Rated Power:
The amount of power a gen
-
erator can be operated at when the ambient
temperature of the site is expected to peak at
65ºC. As the ambient temperature increases
the rated-power decreases.
Rated V
set
:
The amount of V
set
a generator
can be operated at when the ambient tem
-
perature of the site is expected to peak at
65ºC. As the ambient temperature increases
the rated V
set
decreases.
Open Circuit Voltage, V
OC
:
The voltage
at the terminals of a power source when no
appreciable current is flowing.
1 .4 Theory of Operation
A thermoelectric generator (TEG) produces
electrical power through the direct conversion
of heat energy into electrical energy.
This is done by joining two dissimilar, thermoelectric materials at one end and then heating
the junction end to a higher temperature than the other end. This creates a voltage across the
cooler end. Since this voltage is relatively small, the junctions are joined in series to achieve
a useful electrical output. If the temperature difference is maintained, electrical power can be
delivered to a load placed in this circuit.
Figure 1 illustrates how this is done in the model 5120 TEG. A thermocouple is formed by
P type and N type thermoelectric elements joined together at one end by a hot electrode.
Adjacent thermocouples are joined at the other end by cold electrodes. Eighty thermocouples,
each producing 84 mV are connected in series so that the TEG produces 120 V at 6.7 V and
18 Amps.
The TEG voltage varies according to the temperature difference at the thermocouple junction.
The hot side of the thermocouples is maintained at a temperature around 538ºC (1000ºF) by
a burner which operates on propane, or natural gas. The cold side of the thermocouples is
maintained at a lower temperature, around 163ºC (325ºF), by the cooling fins which transfer the
heat to the surrounding air. This temperature difference is controlled by adjusting the amount
of fuel supplied to the burner.
The TEG is supplied with a precision load resistor
that provides the optimum load condition.
This resistor is used both in adjusting the TEG for proper operation and in evaluating its per
-
formance. The fuel flow to the burner is adjusted so that the proper voltage exists across this
precision resistor. At this condition the TEG is operating at the intended junction temperature
and is delivering maximum power.
Figure 1
TEG Design
Summary of Contents for 5060
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Page 10: ...Global Power Technologies 1 2 5120 ...
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Page 27: ...Global Power Technologies 2 12 5120 Figure 13 Wiring Diagram 5120 TEG ...
Page 35: ...Global Power Technologies 3 8 5120 Figure 18 Burner Assembly ...
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Page 50: ...Global Power Technologies 4 3 5120 Figure 26 220 Watt L C Connection and Adjustment Details ...
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Page 55: ...Global Power Technologies 5 4 5120 Figure 30 Cathodic Protection System Parts Identification ...
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Page 63: ...Global Power Technologies 6 6 5120 Figure 33 Exhaust Stack Removal ...
Page 75: ...Global Power Technologies 7 2 5120 7 2 Physical Dimensions Figure 42 Physical Description ...