PASCO ET-8782 Energy Transfer– Thermoelectric - Manual (Page 10)

Energy Transfer –Thermoelectric Conservation of Energy and the First Law of Thermodynamics
10 ®
2. Load Resistance: Connect a jumper from
the terminal at the bottom of the board to
Terminal B. This makes the load resistance
3
Ω + 7 Ω = 10 Ω.
3. Insulators: Place both foam insulators on
the aluminum blocks.
4. Temperature: Connect the cables from the
temperature ports to the Quad Temperature
Sensor. Connect the Cold Side to Channel 1
of the sensor and the Hot Side to Channel 2.
5. Voltage: Connect the voltage leads of the
Voltage/Current Sensor to the Voltage Ports
on the board. Note the polarity.
6. Current: Connect separate red and
black banana patch cords from the
current input of the Voltage/Current
sensor to the Current Ports on the
board. Note the polarity.
7. Computer: Connect the sensors to the
computer through the PASPORT
interface. Open the pre-configured
DataStudio file “Conservation of
Energy”. The display should look as
shown here.
Background
DataStudio has been configured to measure and record the temperature of both aluminum blocks,
the voltage and current applied to the peltier during Heat Pump mode, and the voltage and current
generated by the peltier during Heat Engine mode. From these measured quantities, DataStudio
will calculate and display heat flow, power and work. The following sections explain how
DataStudio makes those calculations.
Heat vs. Temperature
Each digits display shows the heat (Q
hot
or Q
cold
) that flows into or out of the aluminum block on
either the hot or cold side of the peltier. The relationship between heat flow and temperature
change is given by
Q = mc
∆T
where:
Power Supply
Voltage/Current
Sensor
Temperature
Sensor
Ch 1
Ch 2