Temperature ° C
29 28 27 26 25 24 23 22 21 20
S
02 / 02 / 11 12:02:13 AM 02 / 02 / 11 09:02:13 AM 02 / 02 / 11 06:02:13 PM 02 / 03 / 11 03:02:13 AM 02 / 03 / 11 12:02:13 PM 02 / 03 / 11 09:02:13 PM 02 / 04 / 11 06:02:13 AM 02 / 04 / 11 03:02:13 PM 02 / 05 / 11 12:02:13 AM 02 / 05 / 11 09:02:13 AM 02 / 05 / 11 06:02:13 PM 02 / 06 / 11 03:02:13 AM 02 / 06 / 11 12:02:13 PM 02 / 06 / 11 09:02:13 PM 02 / 07 / 11 06:02:13 AM 02 / 07 / 11 03:02:13 PM 02 / 08 / 11 12:02:13 AM 02 / 08 / 11 09:02:13 AM 02 / 08 / 11 06:02:13 PM 02 / 09 / 11 03:02:13 AM 02 / 09 / 11 12:02:13 PM 02 / 09 / 11 09:02:13 PM
Time Brick 30cm( base Case) Brick 20cm Concrete heavy-weight 25cm Concrete heavy-weight 40cm Concrete light-weight 25cm Concrete light-weight 40cm Concrete med-weight 25cm Concrete med-weight 40cm
Temperature ° C
25.5
25
24.5
24
23.5
23
22.5
N
02 / 02 / 11 12:02:13 AM 02 / 02 / 11 09:02:13 AM 02 / 02 / 11 06:02:13 PM 02 / 03 / 11 03:02:13 AM 02 / 03 / 11 12:02:13 PM 02 / 03 / 11 09:02:13 PM 02 / 04 / 11 06:02:13 AM 02 / 04 / 11 03:02:13 PM 02 / 05 / 11 12:02:13 AM 02 / 05 / 11 09:02:13 AM 02 / 05 / 11 06:02:13 PM 02 / 06 / 11 03:02:13 AM 02 / 06 / 11 12:02:13 PM 02 / 06 / 11 09:02:13 PM 02 / 07 / 11 06:02:13 AM 02 / 07 / 11 03:02:13 PM 02 / 08 / 11 12:02:13 AM 02 / 08 / 11 09:02:13 AM 02 / 08 / 11 06:02:13 PM 02 / 09 / 11 03:02:13 AM 02 / 09 / 11 12:02:13 PM 02 / 09 / 11 09:02:13 PM
Time Brick 30cm( base Case) Brick 20cm Concrete heavy-weight 25cm Concrete heavy-weight 40cm Concrete light-weight 25cm Concrete light-weight 40cm Concrete med-weight 25cm Concrete med-weight 40cm
Figure 8: Indoor temperature profile with different thermal mass materials in classrooms 208 and 301 in Jan / Feb 2011
Discussion
In this study, the result of the field study experiment were compared to the thermal simulation analysis result, and an optimum design solution for the base case building was defined based on the optimal solution for each parameter of passive design strategy. The optimum factors were taken from the analysed passive design strategies, including orientation, glazing, and thermal mass and thermal insulation and with respect to the occupants’ thermal satisfaction. The optimum passive design strategies were selected based on the effect of them on the indoor air temperature. Based on the simulation results which were discussed in section 6.1 to 6.4, the suggested optimum design solutions included south and south-east orientation similar to the Iranian building regulations suggestion, external thermal insulation material with the U-value between 0.28 and 0.32w / k for the external walls and inner side of roof, 25 cm high density concrete blocks as a thermal mass material for the exterior façade as well as double glazing windows( Optimum Solution 1). In addition, 30 cm outer brick is considered as an alternative option as thermal mass material( Optimum Solution 2). Figure 9 illustrates the indoor air temperature of the real base case and the optimum solutions in classrooms S and N with respect to outdoor temperature and the minimum comfort temperature. It should be mentioned that the heating system is set to be off for the calculation of the optimum design solutions to estimate the energy consumption of these design solutions.
Passive design strategies on indoor comfort of school buildings in hot-dry climates 759