Environmental Engineering Reference
In-Depth Information
250
250
250
250
250
250
Winter
Winter
Winter
Autumn
Autumn
Autumn
200
200
200
200
200
200
150
150
150
150
150
150
100
100
100
100
100
100
50
50
50
50
50
50
0
0
0
0
0
0
1 13253749617385
1 13253749617385
1 13253749617385
1 13253749617385
Time in h
1 13253749617385
Time in h
1 13253749617385
Time in h
1 13 5 749 173 5
1 13 5 749 173 5
1 13 5 749 173 5
1 13 5 749 173 5
1 13 5 749 173 5
1 13 5 749 173 5
1 13 5 749 173 5
1 13 5 749 173 5
1 13 5 749 173 5
1 13 5 749 173 5
Time in h
1 13 5 749 173 5
Time in h
1 13 5 749 173 5
Time in h
250
250
250
250
250
250
Summer
Summer
Summer
Spring
Spring
Spring
200
200
200
200
200
200
150
150
150
150
150
150
100
100
100
100
100
100
50
50
50
50
50
50
0
0
0
0
0
0
1 3 5 7 9 1 3 5
1 3 5 7 9 1 3 5
1 3 5 7 9 1 3 5
1 3 5 7 9 1 3 5
Time in h
1 3 5 7 9 1 3 5
Time in h
1 3 5 7 9 1 3 5
Time in h
1 325 7 961 385
1 325 7 961 385
1 325 7 961 385
1 325 7 961 385
Time in h
1 325 7 961 385
Time in h
1 325 7 961 385
Time in h
Fig. 5.32
Simulation results for power provision by a 200 MW solar updraft tower power
plant without thermal storage
5.5.2
Economic and environmental analysis
The following considerations are aimed at assessing solar updraft tower power
plants according to economic and environmental parameters.
Economic analysis.
Power generation costs for solar updraft tower power plants
are also calculated in line with the method applied throughout this topic. Follow-
ing this, the costs for construction and operation are determined and distributed in
the form of annuities over the technical lifetime of the power plant. Power genera-
tion costs are calculated on the basis of these depreciations and the generated elec-
trical energy. For this purpose, a technical lifetime of 25 years and an interest rate
of 4.5 % have been assumed. In practice, solar updraft towers are designed for
longer technical lifetimes (e.g. the tower for 60 years).
Since such plants are only installed in areas with a high share of global radia-
tion, also for this purpose, a reference site characterised by an annual total global
radiation on the horizontal plane of 2,300 kWh/m
2
has been assumed.
The energy output of a solar updraft tower power plant is proportional to global
radiation, collector surface and tower height. In this respect, there is no physical
optimum; thus it is necessary to optimise dimensions according to component
costs (collector, tower, turbine) as well as the land costs. This is why plants of
different dimensions can be built - at minimised costs - to suit the local condi-
tions at various sites. If the collector surface is cheap and reinforced concrete is
expensive, then a large collector and a comparatively small tower will be built.
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