Passive Cooling Strategies - Low Energy Cooling for Sustainable Buildings - page 67

400

lighting electricity c o nsump t ion pe r son 1 person 2

350

300

250

200

150

100

50

0

0 50 100 150 200 250 300 350 400

Day of year in 2002

Figure 3.6 Daily internal loads from lighting, electricity consumption and the presence of two persons
in the northern office

or 10-30 hours above 27 ◦ C. In 2003, with a mean summer temperature 3 . 2 K higher
than usual, however, 9.4% of the office hours had room temperatures above 26 ◦ C,
which is more than 230 h or about 5 weeks. This value is just below the maximum
allowed value of 10% according to German standard DIN 4108.
The cumulated hours above a given temperature level show the direct correlation
between ambient temperatures and high internal temperatures: only in 2003 with about
100 hours above 30 ◦ C were there a few hours above 30 ◦ C within the offices, otherwise
this did not occur at all (Figure 3.7).

Figure 3.7 Number of hours where given temperature levels are exceeded