Passive Cooling Strategies - Low Energy Cooling for Sustainable Buildings - page 63

Figure 3.1 Office building with passive energy standard in Weilheim, Germany
for two windows) and air flow takes places via opened corridor doors to the roof,
where flaps automatically open if the internal air temperature is 2 K above ambient
temperature (see Figure 3.2). This concept works because the building is occupied
by one single engineering company with no internal security measures. Otherwise,
openings above the internal doors would be necessary.
The room air temperature setpoint is 22 ◦ C. The control of the earth to air heat
exchanger differs between the heating (ambient air below 15 ◦ C) and cooling period
(ambient air above 15 ◦ C). During the heating period it is bypassed if the soil tempera-
ture, measured at 2 . 35m depth, is colder than the ambient air and the room temperature
is below 22 ◦ C. During the cooling period the earth to air heat exchanger is bypassed
Figure 3.2 Night ventilation concept for the ground and first floor of offices with opening flap at the
roof