产品寿命测定式样报告书（加翻译）（1）

CONFIDENTIAL
HEATSHEETZ
Dr Martin Peacock
Director of Biotechnology and Materials Science
Simmi Uppal
Scientist
CONFIDENTIAL REVISION HISTORY
REVISION NUMBER PAGE
NUMBER
REVISION DATE
NAME
Rev. 1.0.0 Original Document 2/27/2009
Martin
Peacock Rev. 1.0.8 Revision Document 5/8/2009
Martin
Peacock Rev. 1.0.10 Revision Document 5/22/2009
Martin
Peacock
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TABLE OF CONTENTS ...............................................................................................................................................
3 1
4 2
2.0.) T
2.1) T EMPERATURE CYCLING FROM 32︒ F 3
RESULTS .3.0) R 11 3.1) T EMPERATURE CYCLING FROM TO 16 4.1) T EST . 4.2) T EST 2 ............................................................................................................ E RROR ! B OOKMARK NOT DEFINED . 5
20
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AIC Technica has been commissioned by HeatSheetz to carry out a series of temperature and
destructive tests of the HeatSheetz under floor heating panels.
∙ 32 ︒F to 105 ︒F
We report that we have seen a change in the performance of the heating panels and have carried out a linear extrapolation for a 10 year period. Note we have assumed a linear change and although other models including plateaus can be dawn, there is insufficient data at this stage to draw too firm a conclusion.
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2.0.) Temperature cycling from room temperature to 105
AIC is currently cycling four HeatSheetz products in parallel in order to increase the data points collected and our understanding of the HeatSheetz panels, see Figure 2.0.1 and Figure 2.0.2.
Figure 2.0.1 – Covered HEATSHEETZ product under temperature cycling.
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Figure 2.0.2 – Uncovered HeatSheetz product. The testing protocol is as follows:
∙ Plug the HeatSheetz panel into the mains electricity supply (110V), begin the timer
∙
∙
circa
105 ︒F.
∙ Continue to monitor the temperature as the HeatSheetz cools down to lab
temperature.
∙ At the end of the temperature profile, take a photograph of the marked out square and look for signs of cracking, see Figure, 2.0.3.
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Figure 2.0.3 – Photograph of the marked out square.
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2.1) Temperature cycling from 32︒ F to 105︒ F.
A cooling system was designed in accordance with Figure 2.0.4. This test rig allows the cycling
Figure 2.0.4. Design for the test rig
Cooling coils
冷却线圈
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Figure 2.0.6 – During operation a considerable amount of ice builds up.
Figure 2.0.7 – HeatSheetz insulated during testing.
Ice build up
Ice build up in contact with HeatSheetz
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∙
∙
∙
∙
∙ circa 105 ︒F.
∙ At the end of the temperature profile, take a photograph of the marked out square
and look for signs of cracking.
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3.0) Room temperature to 105
︒ F
F igure 3.0.1 – Temperature cycling from room temperature to circa 105 ︒F.
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105 ︒F.
The red box shows temperature cycling at the beginning of the study, whilst the green box
th
2009, we have cycled over 1000 times between room temperature and 105 ︒F.
Cycling but did not record values
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Figure 3.0.3. – 48 cycles are run in a 24 hour period when cycling from room temperature to 105 F.
As well as cycling the temperature, current was also monitored for signs of change, see Figure
3.0.
4. First data set
Second data set
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in week 6. This current data is shown in the Table below:
start end 0.240.26
0.240.26
0.240.26
0.240.26
0.240.26
0.240.26
0.240.26
0.240.26
0.250.26
0.25
0.26
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By calculating the standard deviation and the mean current at the START and at the END. we
were able to ask the question, ”are the currents in the START data set equal to the currents in
the same. Therefore there has been a change in the resisitance over the 6 weeks of cycling as As well as recording the current, a microscope was used to photograph a specific area of the
these are indicative of handling and are not thermally induced cracks, see Figure 3.0.5 and
Figure 3.0.6.
Figure 3.0.5 - Microscopic view of the HeatSheetz Sample 1 before any heating.
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Striations not cracking
Figure 3.0.6 - Microscopic view of HeatSheetz Sample 1 after 22 cycles.
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Figure 3.1.1 – Temperature cycling from 32 ︒F to circa 105 ︒F. Note though cooling is provided throughout,
︒F, see Figure 3.1.2.
Cycling but did not record values
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Second data set
First data set
As well as monitoring temperature, current was similarly monitored and this remained at circa 0.5 A (0.5 A = 2 sheets in series), see Figure 3.1.3
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Figure 3.1.3 . Current profile for a sheet cycling between 32 ︒F and 105 ︒F.
Throughout the study four HeatSheetz panels were temperature cycled.
Start End
0.4875
0.485
0.4875
0.485
0.4875 0.4975
If we compare the two data sets at the START of the temperature cycling and at the END of the temperature cycling in the table above, we can see that there is not a statistical difference
between the two. This is because the spread of data is large and so statistical methods can’t
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temperature and 105 F. This difference is on going from the
START of the study until the END of the study and is shown by the difference between the two data sets collected on HeatSheetz
panels that were cycled about 1000 times.
We can extrapolate the result out to 10 years (assuming 6 cycles/day for 10 years) and we may Figure 4.1.1 . A linear extrapolation on going from the current performance out to a 10 year time point. Current performance
Predicted performance
Progress report DATE: 5/22/2009
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Copyright 2009. All rights reserved 21 The HeatSheetz that are being cycled between 32 ︒F and 105 ︒F have not shown a statistically significant difference between the START of the temperature cycling and the END , but this is because the noise on the data is too large for statistical methods to see any changes.。