Net ZEB Case Studies - Modeling, Design, and Optimization of Net-Zero Energy Buildings - page 420

precooling. Rules of thumb for optimizing natural ventilation could be
summarized as follows:
- A short building depth, like the RSF's 18 m depth. A large building
length to depth ratio (in plan) allows outdoor air to easily flow in and
out of the building, particularly at night to cool building thermal mass;
- Open plan interior and low-height furniture to facilitate air
circulation;
- Operable and automatic motorized windows that open at night.
One side effect is that the same advantageous conditions for increasing
daylighting penetration and natural ventilation can reduce acoustic quality
(see Section 3.4 on acoustic comfort). The RSF uses displacement
ventilation, which necessarily uses a low airflow rate. White noise
generators are used to add background noise - which would normally be
present in buildings with entrainment ventilation.
7.4.2.8 Building Operation, Typical Monitored Data, and Thermal
Performance
For each bay of the south wing, the floor space is divided into four types of
thermal zones as shown in Figure 7.53 : SE/SW for east/west end zone of
the south wing, N for north, I for interior, and S for south zone. The room/
ceiling slab temperatures and ventilation rate are controlled separately. The
ventilation supply air is 100% fresh (i.e., no mixing with return air), and the
setpoint is 19.4 °C (67°F) for the whole building for all seasons. The typical
section identified in Figure 7.53 is used later for thermal modeling.