Study on the Abnormal
Heat of Pd-D2 System
Reporter： Li Jing
Guidance teacher：Zheng ShuXin
1
Source of our idea
X.Z.Li, et al.,J.Phys.D:Appl.Phys.,36,3095 (2003).
2
Aims and methods of our experiment
•
•
•
•
Observe the abnormal heat
Correlation with deuterium flux
Find factors affecting the heat such
as pressure, temperature
Measure temperature instead of the
heat flow
3
Schematic view of our apparatus
4
Schematic view of our apparatus
5
Picture of our apparatus
6
Picture of our apparatus
7
Picture of our apparatus
8
Black box model of our apparatus
9
Results of our experiment (5/26)
Temperature Distribution along Pd Tube
Under Room Condition without Filling Deuterium
25.5
Room
o
Tempetature( C )
25.0
Middle
24.5
Pt 5
24.0
Pt 4
Pt 1
Pt 2
23.5
Pt 3
23.0
0
40000
80000
120000
Time (s)
160000
200000
10
Results of our experiment (6/14)
Temperature as a Function of Time
HeaterM
Pt2
Pt3
Pt4
Pt5
HeaterD
200
160
o
Temperature ( C)
180
140
120
100
80
0
3000
6000
9000
12000
Time (s)
15000
18000
6/14
11
Results of our experiment (6/14)
Temperature Distribution along Pd Tube
when Filling Deuterium and Cooling dowm
146
144
Pt3
142 Pt4
o
Temperature ( C)
140
Pt5
138
136
134
Pt2
132
130
128
126
8000
9000
10000
11000
Time (s)
12000
13000
12
6/14
Results of our experiment (6/15)
146
Temperature Distribution along Pd Tube
when Filling Deuterium and Cooling down
144
142
o
Temperature ( C)
140
Pt3
Pt2
Pt4
138
136
134
132
Pt5
130
128
126
124
8000
8500
9000
9500
10000 10500 11000 11500 12000
Time (s)
6/15
13
Discussion of the experiment
Summary of the Conditions
when the Abnormal Variation Happened
Position
Temperature Range
Pt2 Thermistor
（105~130mm）
128C̊~138C̊
Max Value of the Variation
~10C̊
Lasting Time
~3000s
Pressure inside the Pd Tube
~0.14MPa
Pressure outside the Pd Tube
~2Pa
Heating Power
~25W
14
Discussion of the experiment
•
Did the Pt2 thermistor work correctly?
Did the temperature of the Pd tube near
Pt2 change?
Why did only Pt2 change?
Possible affecting factors:
Keithley Model 2000 DMM
Resistance of the whole circuit
of course, temperature change
15
Discussion of the experiment
Is the change of temperature caused by
filling deuterium?
Temperature Distribution along Pd Tube
when cooling down without Filling Deuterium
150
148
Pt3
146
144
o
Temperature ( C)
•
Experiment conducted
on 6/16
No variation observed
142
140
Pt4
138
136
Pt2
Pt5
134
132
130
128
126
6500
7000
7500
8000
8500
Time (s)
9000
9500
10000
16
6/16
Discussion of the experiment
•
How does the deuterium lead to the
raising of the temperature?
Possible mechanisms:
Heat Exchange
Detaching and Attaching of Deuterium
Joule-Thomson Effect
Of course, Maybe Nuclear Reactions!
17
Conclusion of our experiment
•
•
•
•
Abnormal Variation of Resistance
Correlation with Abnormal Deuterium Flux
not Detected
Reproducible (once)
Further study is expected to identify the
reasons!
18
Suggestions to further study
•
•
•
Try to prolong the time of the abnormal
variation by increasing the heating power
Filling hydrogen to the Pd Tube to
eliminate some possible reasons
Measure the DC volt to identify whether
the abnormal variation is caused by the
change of resistance
19
Thanks
20
Supplement-Power(6/14)
Heating Power as a Function of Time
140
120
Power (W)
100
80
60
40
20
0
0
3000
6000
9000
12000
Time (s)
15000
18000
6/14
21
Supplement-Pressure(6/14)
Pressure as a Function of Time
18
16
14
Pressure (Pa)
12
10
8
6
4
2
Stop Pumping
0
0
3000
6000
9000
12000
Time (s)
15000
18000
6/14
22
Supplement-Room Temp. (6/14)
Room Temperature as a Function of Time
29.8
o
Temperature ( C)
29.6
29.4
29.2
29.0
28.8
0
3000
6000
9000
12000
Time (s)
15000
18000
23
6/14