Net ZEB Case Studies - Modeling, Design, and Optimization of Net-Zero Energy Buildings - page 446

Further potential enhancement in an archetype . Additional improvements
that could be explored based on results from the simulations include the
following:
- The energy required to warm up outdoor supply air can be reduced by
heat recovery ventilation; and,
- Thermal energy collected through solar thermal collectors, such as the
transpired collector described earlier, can be used to warm up the
supply outdoor air (it has been implemented in RSF, but not considered
in the thermal model just presented). This warm air can assist space
heating. The collected thermal energy can also be stored in the hydronic
slabs/walls, and used later to reduce morning space heating load.
Summer Design Day for Cooling-Dominated Climate
For a cooling-dominated climate case, the room temperature cooling
setpoint is 24 °C between 6 A.M. and 6 P.M., and 27 °C for the rest of the
time. Double-glazed windows with low SHGC but high visible transmittance
are used for all windows including the view windows. The WWR of the
daylighting window is kept at 32%. Supply air temperature is kept at 18.9
°C, unchanged as well. The energy for cooling the ventilation air is 2.01
kWh/m façade width for a 0.2 ACH ventilation rate based on the exterior
temperature depicted in Figure 7.69 . The daylight illuminance setpoint for
the interior thermal zone is 250 lux (300 lux was used in the winter case)
to further reduce solar heat gain. The VC louver will be adjusted to reduce
transmittance, when room temperature is less than 2 °C lower than the
room cooling setpoint and daylight illuminance of the interior zone reaches
250 lux.