3B SCIENTIFIC PHYSICS G U10050 Instrucciones De Uso página 7

5.3 Plotting a graph of pressure against volume
when the Stirling engine is being used as a
heat pump
Additional instruments needed:
DC Power supply 15 V, 1.5 A
or
DC Power supply 15 V, 1.5 A
TM
3B NETlog
or
TM
3B NETlog
TM
3B NETlab
Relative pressure sensor, ±1000 hPa
Displacement sensor
Sensor Holder for Stirling Engine G
•
Attach the holder for the sensor to the base plate
of the Stirling engine.
•
Fit the relative pressure sensor to the bottom of
the sensor holder and the displacement sensor
at the top with the printed sides of the sensors
both facing upwards.
•
Connect the nozzle marked "+" on the relative
pressure sensor to the nozzle on the working cyl-
inder of the Stirling engine by means of the hose
included with the sensor holder (U11372) (see
Fig. 4).
Fig.2 The Stirling motor as a heat engine
•
Screw the cap nut attached to the string (sup-
plied with the sensor holder) onto the thread of
the working piston, thread the string around the
displacement sensor pulley and attach a coil
spring to the threaded rod (a detailed descrip-
U8521121-230
tion of how to attach the sensor to the sensor
holder is included in the instruction manual for
U8521121-115
the sensor holder U11372).
U11300-230
•
Connect the pressure sensor to analog input A of
the 3B NETlog
U11300-115
sor to analog input B.
U11310
•
Connect a DC voltage source via the 4 mm sock-
U11322
ets.
U11371
•
Adjust the voltage (maximum 12 V) and operate
U11372 the Stirling engine with the switch in the "down"
position.
•
Run the 3B NETlab
ment "Stirling engine G" and plot a graph of
pressure against volume.
3
TM
unit and the displacement sen-
TM
software, open the experi-