Net ZEB Case Studies - Modeling, Design, and Optimization of Net-Zero Energy Buildings - page 443

Fig. 7.66 Typical design conditions for heating dominated climate

The heating power to the slab is

(7.9)

where Δ q heating = 550 W/K, estimated by assuming the heating power is
able to bring the room and slab temperature 1 °C higher in 2 h with 2 °C
difference between the setpoint and room air temperatures.

By keeping the daylight window area as it is for the RSF building, the WWR
for the daylight window (surface 9) is about 13%. Figure 7.67 shows the
thermal and daylighting performance of the typical section. The heating
energy consumption for the 2-day study period is 5.74 kWh/m south façade
width. The energy is spent in the mornings to heat up the room back to
the daytime setpoint after the night setback. The energy for warming up
the incoming outdoor air is 5.83 kWh/m south façade width for a 0.2 ACH
ventilation rate.