4.3.3 Data analysis

The data will be analysis like the average method, 2 laser thermometers will record the surface temperature in both sides, time period between 2 measurement point is 10 minutes. The heat flux is the average value in 60 second.

There are 3 measurements, every measurement has 40 minutes totally. The first test is not very accurate since the laser thermometer did not fix tight with the supporting, the focus point did not shoot to the black tape area. The second test and third test are the same running from different time, and zone 1 air temperature was rising because heat from cooling fan in the warm side. Since this method is generally used on site as a fast method and does not have very high temperature requirements like HFM, the experimental data is still considered acceptable.

IR test 1

1 2 3 4 Average Heat flux 3.48 3.38 2.58 2.01 Surface temperature warm side 38.3 38.5 38.7 38.7 Surface temperature cold side 15.6 16.1 16.1 16.1 U 0.154 0.151 0.112 0.087 0.126 IR test 2

1 2 3 4 Average Heat flux 3.67 3.81 3.80 3.35 Surface temperature warm side 36.4 39.7 39.9 40.2 Surface temperature cold side 21.5 21.5 22.0 22.0 U 0.246 0.210 0.213 0.184 0.213 IR test 3

1 2 3 4 Average

Heat flux 4.54 5.07 4.58 4.88

Surface temperature warm side 42.7 42.7 42.9 43.0 4Surface temperature cold side 22.0 22.0 22.0 22.0

U 0.220 0.244 0.219 0.232 0.229 Table 11 test results summary of IR test 1-3

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Except the IR test 1 has a lower value than others, the rest of measurement result are close to the U-value calculated by heat flux average method. However, in the temperature in the cold side shows a significant difference between IR test 1 and IR test 2/3. At the same time, in the data from PT100 in the cold zone, it shows the surface temperature in the cold zone is always around 15℃ during the test period.

Figure 36 IR test 2 cold zone surface temperature

Figure 37 the heat flux data- IR test 2

Figure 38 the heat flux data– IR test 3

The group also doubted that there is maybe thermal bridge between 2 zones through

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the sample wall, a thermal graph camera is used to look over around the whole wall, based on the infrared photos taken right after one test, there is no huge temperature difference in the sample wall area except the connecting nails. The other photos are put in the Appendix H- photos from thermography camera.

Figure 39 thermal Imaging of sample wall right after a test

Due to the limited time and number of people, it is hard to do more tests and investigation. But the plan should be focus on calibrating the heat flux value and verifying the temperature. For example, the 2 laser thermometers can switch to another zone, the recorded value can also be used to compare with the previous test data. The detail data for IR tests is in the Appendix F- IR tests results.

Figure 40 compare table- laser thermometer tests

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