4.5 Temperature Drop with PCM Materials
105
4.5.1 Paraffinic PCM at Speed of 55 kph
The comparison graphs for different paraffinic PCM materials at 55 kph speed are
shown from Figs. 4.26, 4.27, 4.28 and 4.29. It was observed from the figures that the
difference in the maximum drop in temperature achieved by using different PCM
materials are within a very close range of 3.1–3.7 °C. This was attributed to the
melting point of the PCM materials, which are close to one another as indicated
by the DSC graphs (Figs. 4.38, 4.39, 4.40 and 4.41). It can also be observed from
Figs. 4.26, 4.27, 4.28 and 4.29 that the maximum drop in temperature achieved by
using PCM materials such as non-woven, foam, fabric and composite were 3.1 °C,
3.6 °C, 3.7 °C and 3.6 °C, respectively, over the total experimental time of 60 min.
These figures indicate that the drop in temperature is rapid for the initial part of
the experiment and as the time elapses the drop in temperature gradually decreases
reaching a steady state.
Figure 4.26 indicates that the maximum drop in temperature achieved was 3.1 °C.
Correspondingly, in the initial stage the drop in temperature curve shows a greater
drop in temperature and then stabilises for a short period of time, and subsequently,
the drop in temperature decreases after the 30 min mark. The experimental data is
given in appendix A1.
Figure 4.27 indicates that the maximum drop in temperature achieved was 3.6 °C.
Similarly, in the initial stage the drop in temperature curve shows a higher drop
in temperature and then stabilises for a short span and subsequently the drop in
temperature decreases after the 25 min mark.
Figure 4.28 indicates that the maximum drop in temperature achieved was 3.7 °C.
Similarly, in case of the PCM fabric material, in the initial stages the drop in temperature curve shows a greater drop in temperature and then stabilises for a short period
and subsequently the drop in temperature decreases after the 30 min mark.
Figure 4.29 indicates that the maximum drop in temperature achieved was 3.6 °C.
In the initial stage, the drop in temperature curve shows a greater drop in temperature
and then stabilises for a short span and subsequently the drop in temperature decreases
after the 26 min mark.
In addition to these graphs (Figs. 4.26, 4.27, 4.28 and 4.29), another graph was
plotted to compare the effect of drop in temperatures using different PCM at 55 kph
speed as shown in Fig. 4.30. The values of maximum drop in temperature and the
corresponding time are also shown in Table 4.3.
It was observed from Fig. 4.30 that the effective drop in temperature achieved is
highest with PCM fabric material and lowest with PCM non-woven material. The
drop in temperature varied from 3.1 °C to a maximum of 3.7 °C depending on the
type of material used. Also, a graph was plotted to compare the effective cooling
achieved inside the helmet by using different PCM materials at 55 kph speed as
shown in Fig. 4.31.
It was observed from Fig. 4.31 that the drop in temperature is rapid for the initial
duration of the experiment irrespective of the type of PCM material contained in
the textile liner. This is because the amount of PCM microcapsules contained in
105
4.5.1 Paraffinic PCM at Speed of 55 kph
The comparison graphs for different paraffinic PCM materials at 55 kph speed are
shown from Figs. 4.26, 4.27, 4.28 and 4.29. It was observed from the figures that the
difference in the maximum drop in temperature achieved by using different PCM
materials are within a very close range of 3.1–3.7 °C. This was attributed to the
melting point of the PCM materials, which are close to one another as indicated
by the DSC graphs (Figs. 4.38, 4.39, 4.40 and 4.41). It can also be observed from
Figs. 4.26, 4.27, 4.28 and 4.29 that the maximum drop in temperature achieved by
using PCM materials such as non-woven, foam, fabric and composite were 3.1 °C,
3.6 °C, 3.7 °C and 3.6 °C, respectively, over the total experimental time of 60 min.
These figures indicate that the drop in temperature is rapid for the initial part of
the experiment and as the time elapses the drop in temperature gradually decreases
reaching a steady state.
Figure 4.26 indicates that the maximum drop in temperature achieved was 3.1 °C.
Correspondingly, in the initial stage the drop in temperature curve shows a greater
drop in temperature and then stabilises for a short period of time, and subsequently,
the drop in temperature decreases after the 30 min mark. The experimental data is
given in appendix A1.
Figure 4.27 indicates that the maximum drop in temperature achieved was 3.6 °C.
Similarly, in the initial stage the drop in temperature curve shows a higher drop
in temperature and then stabilises for a short span and subsequently the drop in
temperature decreases after the 25 min mark.
Figure 4.28 indicates that the maximum drop in temperature achieved was 3.7 °C.
Similarly, in case of the PCM fabric material, in the initial stages the drop in temperature curve shows a greater drop in temperature and then stabilises for a short period
and subsequently the drop in temperature decreases after the 30 min mark.
Figure 4.29 indicates that the maximum drop in temperature achieved was 3.6 °C.
In the initial stage, the drop in temperature curve shows a greater drop in temperature
and then stabilises for a short span and subsequently the drop in temperature decreases
after the 26 min mark.
In addition to these graphs (Figs. 4.26, 4.27, 4.28 and 4.29), another graph was
plotted to compare the effect of drop in temperatures using different PCM at 55 kph
speed as shown in Fig. 4.30. The values of maximum drop in temperature and the
corresponding time are also shown in Table 4.3.
It was observed from Fig. 4.30 that the effective drop in temperature achieved is
highest with PCM fabric material and lowest with PCM non-woven material. The
drop in temperature varied from 3.1 °C to a maximum of 3.7 °C depending on the
type of material used. Also, a graph was plotted to compare the effective cooling
achieved inside the helmet by using different PCM materials at 55 kph speed as
shown in Fig. 4.31.
It was observed from Fig. 4.31 that the drop in temperature is rapid for the initial
duration of the experiment irrespective of the type of PCM material contained in
the textile liner. This is because the amount of PCM microcapsules contained in