Sustainable Building Operation Using Simulation - Low Energy Cooling for Sustainable Buildings - page 232

Figure 6.31 View of rehabilitated residential buildings facing north-south

This simple approach assumes that solar irradiance gains can be neglected, which
is reasonable for buildings with rather low window fractions. An irradiance correction
algorithm was applied to the data, which corrects the solar gains Q SG as calculated
in the EN 832 standard by the measured irradiance G . This corrected solar gain is
added to the measured heating energy consumption and then degree day corrected.
The normalized consumption value is then obtained by subtracting the standard solar
gains from the heating energy calculations:

E c,measured + G 15 m

G 15 −

G
G m

E c,normalized = Q SG Q SG (6.17)

30

Building rehabilitation

25

Heating energy consumption
Heating energy demand EN 832

=0.7 h -1

n

20

Heating energy demand EN 832 n =0.35 h -1

15

10

5

0

0 12 24 36 48 60 72

Months

Figure 6.32 Heating energy consumption and demand calculated using the European standard EN 832
with air exchange rates of 0.35 and 0.7 h − 1