Net ZEB Case Studies - Modeling, Design, and Optimization of Net-Zero Energy Buildings - page 455

shading, and construction materials ( Figure 7.73 ). A PV system on the
naturally ventilated PV roof generates electricity and balances the building's
energy consumption, while simple active technologies (e.g., ceiling fans)
are utilized for the periods of the year when the passive measures alone
cannotmeetoccupancycomfortrequirements.Thefinalconstructioncostof
ENERPOS was 3200 €/m 2 (net floor area) or 1660 €/m 2 (gross floor area).
Fig. 7.73 Main features of the Net ZEB design of the ENERPOS building:
(a) Exterior fixed solar shading system; (b) Interior frosted glass louvers
between the offices and the central corridor; (c) Green patio between the
two wings of the building and on top of the parking lot (Photos courtesy of
Jérôme Balleydier)
7.5.1 Natural Cross-Ventilation and Ceiling Fans
A major challenge in passive building design in a tropical climate is to
maintain thermal comfort using passive means and thus, minimize the
cooling energy consumption of the building. ENERPOS' operable windows
are located on the north and south building façades, utilizing the sea breeze
(south winds) during summer, while minimum openings on the east and
west building façades protect the building from the winter prevailing winds
(east and southeast winds) and morning and afternoon sun. The long axis