Sustainable Building Operation Using Simulation - Low Energy Cooling for Sustainable Buildings - page 221

1200

1100

flat plate collectors

1000

vacuum tube collectors

900

800

Potenziell (vacuum tube
collectors) 700

600

500

-0.1668

y VTC = 829.49 x

400

300

200

100

-0.0426

y FPC = 297.79 x

0

1 10 100 1000

Collector surface area / m²

Figure 6.22 Specific collector costs without VAT as a function of size of the installation

it is difficult to obtain reliable information about installation and system integration
costs. Therefore, two simulation runs were done with different cost assumptions for
installation and integration. The first simulations were done with very low installa-
tion costs at 5% of total investment plus 12% for system integration. The results are
shown in Figures 6.24, 6.25 and 6.26. A second round of simulations is based on 25%
installation and 20% system integration costs (for results see Figure 6.27).
The total costs per megawatt hour of cold produced C total are obtained by summing
the chiller cost C chiller , the solar costs C solar , the auxiliary heating costs C aux and the
costs for cooling water production C cooling . The costs for heating have to be divided

10

9 buffer storage

8

drinking water storage

7

combined buffer and drinking water storage

6

5

y = 16,011x -0,2403

4

y = 67,24x -0,4568

3

y = 5,0127x -0,1931 2

1

0

100 1000 10 000 100 000

Storage volume / litre

Figure 6.23 Costs for different storage tank systems