Net ZEB Case Studies - Modeling, Design, and Optimization of Net-Zero Energy Buildings - page 466

lighting, exterior lighting, ceiling fans, air-conditioning terminal units, split
systems in the two technical rooms, VRV group, air treatment unit, plug
loads, and elevator) to identify the most energy-consuming items and take
energy management actions, if necessary. There are occupancy sensors to
measure the occupancy rate as well as temperature and humidity sensors
in all classrooms and offices. An on-site weather station provides outdoor
conditions. Portable units measuring environmental conditions (inside air
temperature, black globe temperature, air velocity, humidity and
illuminance) have been deployed to provide short-term assessment of the
indoor environment.
The overall monitoring system cost €72,425, which represents 3% of the
overall cost of the building construction. This price includes the fixed
instrumentation (energy-meters, temperature and humidity sensors, the
wiring, and the commissioning) as well as the portable comfort measuring
device.
7.5.10 Monitored Data
7.5.10.1 Measured Performance
The ENERPOS building has been fully monitored since May 2010. The
measured dataofthesecondacademic yearofthebuilding (fromSeptember
2011 to August 2012) are given in Figure 7.77 . The total energy use of
the building was 10,202 kWh, which represents an energy ratio of
approximately 14 kWh/m 2 NFA /yr. Compared to other office and university
buildings on Reunion Island (100 kWh/m 2 NFA /yr), ENERPOS consumes
seventimesless.Bylookingatthedifferentend-uses,itshouldbenotedthat
the plug load consumption represents approximately half of the total energy
use of the building and remains more or less constant over the year. The
energy end-uses thatvary themostare theair-conditioning (particularly the
use of the split systems in the technical rooms), ceiling fans, and interior
lighting. Furthermore, exterior lighting consumption increases during
winter (May to October).