Geothermal Cooling - Low Energy Cooling for Sustainable Buildings - page 91

25

Soil measured Soil simulated

20

15

10

5

0

0 4000 8000 12 000 16 000 20 000 24 000

Hours after 1 January 2001

Figure 4.4 Measured and simulated soil temperatures at 2 . 35m depth

unusually warm year of 2003 is found to be very satisfactory (see Figures 4.5, 4.6
and 4.7).
Given the limited input effort and the fast calculation process, even dynamic situ-
ations can be modelled with acceptable results down to a resolution of one hour. The
mean differences between the measured and simulated outlet temperature for the years
of 2001 to 2003 are 0.4, 0.7 and 0 . 4 K respectively (as an example see Figure 4.7).

40

30

20

10

0

-10

-20

0 1000 2000 3000 4000 5000 6000 7000 8000 9000

Hours after 1 January 2001

Input air measured Output air measured Simulated - measured

Figure 4.5 Measured ambient and outlet air temperature of the earth heat exchanger in the moderate
year of 2001. Also shown is the temperature difference between the simulated and measured value