ZEMCH 2015 - International Conference Proceedings | Page 467

DB2 simulation
The next step consists on applying bioclimatic strategies such as the modification of window sizes or their orientation, the application of shading systems over the windows and allowing fluent
cross ventilation. During this step the model will be called DB2 (Table 7).
Table 7: DB2 building parameters.
Building
parameters

Site

DB2

Londrina, Brazil

Treated floor External wall
area TFA
U-value
(m2)
(W/m2K)

66.67

Windows
(including
frames)
U-value
(W/m2K)

Roof surface
U-value
(W/m2K)

Floor slab
U-value
(W/m2K)

Average
thermal
envelope

2.343

0.400

1.200

0.863

0.369

Due any materials are improved during this stage the fabric U-values do not suffer significant
changes. However a reduction in the windows U-value can be observed, which was accomplished
by redesigning their form and frame. (Figs. 21,22).

Figure 21: DB2 plan, section and bioclimatic strategies.
These implemented bioclimatic design strategies allow the DB2 prototype to considerable reduce
its’ cooling demand in comparison to the DB1 model. The heating demand is omitted because it
did not suffer any changes from the previous model (Fig. 22).

Figure 22: DB2 monthly cooling demand.

Design decision-making process of affordable low energy homes in Latin America

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