Net ZEB Case Studies - Modeling, Design, and Optimization of Net-Zero Energy Buildings - page 470

Fig. 7.78 Energy consumption of the ENERPOS building. Comparison
between design phase calculations and the measurements for the first two
years of operation

Table 7.22 Energy ratio (kWh FE /m 2 /yr) by end-uses: calculation during
the design phase and measurements for 2 years

Interior
Lighting

Exterior
Lighting

Ceiling
Fans

Ventilation Split
Systems

AC AHU Plug

Design phase
(kWh FE /m 2 /yr)

1.6 2.4 1.6 0.9 14.7 2.8 0.9 20.0 0.2

Building
operation (June
2010 to May
2011)

1.9 1.0 1.5 0.6 1.1 0.4 0.0 6.2

Building
operation (June
2011 to May
2012)

2.6 1.2 1.5 0.4 0.7 0.2 0.1

The air conditioning (AC and VRV) and the AHU were installed in the
offices and in the two computer rooms. The comfort zones proposed by
Givoni (1998) were used to assess the thermal comfort of the rooms when
operating under natural ventilation mode. The offices were assumed to be
air-conditioned for 1.5 months and the computer rooms for three months
(15 days in December and from the start of February to mid-April, which
represents 42 working days). The air-conditioning energy was thus
predicted to be 2.8 kWh/m 2 /yr. In fact, it was revealed that after three