48
S. F. Ali and D. Rakshit
Fig. 4.5 PMV versus PPD
curve for cellulose foam wall
insulation
0
3
6
9
12
15
18
21
24
27
30
33
36
39
42
-1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4
PPD (%)
PMV
Cellulose Foam
creating a zone of warmer environment. It can also be spotted that the PPD value has
decreased as well, from a value of 36.61 to 25.24%, indicating that even though the
environment is warmer, more percentage of occupants are feeling satisfied with their
thermal environment, as during the winter season, people tend to opt for warmer
indoor spaces.
Likewise, each of the material was applied to the wall construction and similar
results were obtained, as that in Fig. 4.4, for each of the case, with slight deviations
in the extents of the PMV and PPD ranges, which can be observed from Table 4.5.
It can be established from the results that there is a reduction in the minimum and
maximum PMV values in all the cases. These materials brought the range of PMV of
the room closer to the ideal range, and in each of the case, curves of PMV versus PPD
have shifted from a cooler side of the scale to the warmer side of the PMV scale owing
to the reason that the colder conditions inside the unconditioned building due to the
ambient are transforming into warmer conditions because of the restriction to the heat
flow from the inside to the outside due to provision of insulation. Consequently, the
PPD value too has decreased in each case. Additionally, these results also suggest that
after provision of these insulating materials, people might feel discomfort because
of the resulting warmer environment rather than the colder one. On comparing the
results of the comfort indices for each of the insulating materials, it can be perceived
Table 4.5 Results of provision of wall insulation
Insulation
material
Cellulose
foam
Mineral wool Fiber glass Polyurethane
foam
Expanded
polystyrene
Minimum
PMV
−0.43
−0.46
−0.45
−0.41
−0.44
Maximum
PMV
0.98
0.97
0.97
1.01
0.98
Maximum
PPD
25.24
25.13
24.82
26.54
25.19
S. F. Ali and D. Rakshit
Fig. 4.5 PMV versus PPD
curve for cellulose foam wall
insulation
0
3
6
9
12
15
18
21
24
27
30
33
36
39
42
-1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4
PPD (%)
PMV
Cellulose Foam
creating a zone of warmer environment. It can also be spotted that the PPD value has
decreased as well, from a value of 36.61 to 25.24%, indicating that even though the
environment is warmer, more percentage of occupants are feeling satisfied with their
thermal environment, as during the winter season, people tend to opt for warmer
indoor spaces.
Likewise, each of the material was applied to the wall construction and similar
results were obtained, as that in Fig. 4.4, for each of the case, with slight deviations
in the extents of the PMV and PPD ranges, which can be observed from Table 4.5.
It can be established from the results that there is a reduction in the minimum and
maximum PMV values in all the cases. These materials brought the range of PMV of
the room closer to the ideal range, and in each of the case, curves of PMV versus PPD
have shifted from a cooler side of the scale to the warmer side of the PMV scale owing
to the reason that the colder conditions inside the unconditioned building due to the
ambient are transforming into warmer conditions because of the restriction to the heat
flow from the inside to the outside due to provision of insulation. Consequently, the
PPD value too has decreased in each case. Additionally, these results also suggest that
after provision of these insulating materials, people might feel discomfort because
of the resulting warmer environment rather than the colder one. On comparing the
results of the comfort indices for each of the insulating materials, it can be perceived
Table 4.5 Results of provision of wall insulation
Insulation
material
Cellulose
foam
Mineral wool Fiber glass Polyurethane
foam
Expanded
polystyrene
Minimum
PMV
−0.43
−0.46
−0.45
−0.41
−0.44
Maximum
PMV
0.98
0.97
0.97
1.01
0.98
Maximum
PPD
25.24
25.13
24.82
26.54
25.19