Large shell structures for power generation technologies Wilfried B. Krätzig, Reinhard Harte, Ralf Wörmann: IASS – IACM 2008 • 6 th Int. Conference on Computation of Shell and Spatial Structures 28 – 31 May 2008 • Cornell University, Ithaca, NY, USA 1. Natural draft cooling towers and solar updraft chimneys: Why large? 2. Natural draft cooling towers: Construction principles • loading and internal stress variables • shape optimization • instability and vibrations • damage and life-duration 3. Solar updraft power plant chimneys: Construction principles • shell strength versus ring stiffening • instability and vibrations 4. Conclusions
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Large shell structures for power generation technologies
Wilfried B. Krätzig, Reinhard Harte, Ralf Wörmann:
IASS – IACM 2008 • 6th Int. Conference on Computation of Shell and Spatial Structures 28 – 31 May 2008 • Cornell University, Ithaca, NY, USA
1. Natural draft cooling towers and solar updraft chimneys: Why large?
2. Natural draft cooling towers: Construction principles • loading and internal stress variables • shape optimization • instability and vibrations • damage and life-duration
3. Solar updraft power plant chimneys: Construction principles • shell strength versus ring stiffening • instability and vibrations
4. Conclusions
Actual cooling tower projects made of high-performance concrete in Germany
From high natural draft cooling towers to solar chimneys
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-30
From natural draft cooling towers to solar chimneys
Solar GreenTower Competence Network®
W.W. Stinnes M.Sc.(Phys.), Haiger (Germany) und Pretoria (RSA)
Prof. Dr. R. Harte, U. Wuppertal + Krätzig & Partner, Bochum
Prof. Dr. Dr. E.h. W.B. Krätzig, Ruhr-University + Krätzig & Partner, Bochum
Prof. Dr. H.- J. Niemann, Ruhr-Universität und Niemann & Partner, Bochum
Prof. Dr. D.G. Kröger, University of Stellenbosch, RSA
Prof. Dr. T.W. von Backström, University of Stellenbosch (RSA)
Prof. Dr. G.P.A. van Zijl, University of Stellenbosch und T.U. Delft
Dr. V. Wittwer, ISE Fraunhofer Institut für Solare Energiesysteme, Freiburg
Prof. Dr. J. Meins, T.U. Braunschweig
further research institutes and industrial enterprises from different countries
Annual global solar radiation (kWh / m2)Yellow areas – more than 1950 kWh / m2
o Red areas – more than 2200 kWh / m2
Acc
. Kro
eger
/Pra
etor
ius
(Uni
v. S
telle
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ch):
Sol
ar C
him
ney
Pow
er P
lant
Per
form
ance
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-45
Acc
. Kro
eger
/Pra
etor
ius
(Uni
v. S
telle
nbos
ch):
Sol
ar C
him
ney
Pow
er P
lant
Per
form
ance
Sun
Collector Area CA Turbine
Ground Generator coupled to the turbine PCU
Solar Chimney SC
Schematic solar chimney power plant
Prototype solar chimney power plant Manzanares, Spain (1982), prototype project Prof. J. Schlaich
Acc
. Kro
eger
/Pra
etor
ius
(Uni
v. S
telle
nbos
ch):
Sol
ar C
him
ney
Pow
er P
lant
Per
form
ance
Solar Chimney
32 Turbine openings Ø 31 mCollector roof
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-31
Natural Hazard Resistant Design of the Green Tower
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-33
GreenTower Project Namibia: Tower foot alternative
32 Additional StiffeningWalls d = 2.0m
32 TurbinesØ 31 m
Artist’s view of large solar chimney power plant
Acc
. Stin
nes
(Gre
enTo
wer
Ltd.
): S
hort
Exe
cutiv
e S
umm
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June
200
7
Large shell structures for power generation technologies
Wilfried B. Krätzig, Reinhard Harte, Ralf Wörmann:
IASS – IACM 2008 • 6th Int. Conference on Computation of Shell and Spatial Structures 28 – 31 May 2008 • Cornell University, Ithaca, NY, USA
1. Natural draft cooling towers and solar updraft chimneys: Why large?
2. Natural draft cooling towers: Construction principles • loading and internal stress variables • shape optimization • instability and vibrations • damage and life-duration
3. Solar updraft power plant chimneys: Construction principles • shell strength versus ring stiffening • instability and vibrations
4. Conclusions
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbH BochumK & P 08/4-15
NDCT RWE Lignite Power Plant Neurath 2007
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbH BochumK & P 08/4-13
NDCT RWE Lignite Power Plant Neurath 2007
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-29
Lignite power station Neurath in boundary wind tunnel
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-29
Gust modeling in the wind tunnel
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbH BochumK & P 08/4-8
NDCT Vattenfall Lignite Power Plant Boxberg 2008
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbH BochumK & P 08/4-23
NDCT RWE Lignite Power Plant Neurath 2007
Large shell structures for power generation technologies
Wilfried B. Krätzig, Reinhard Harte, Ralf Wörmann:
IASS – IACM 2008 • 6th Int. Conference on Computation of Shell and Spatial Structures 28 – 31 May 2008 • Cornell University, Ithaca, NY, USA
1. Natural draft cooling towers and solar updraft chimneys: Why large?
2. Natural draft cooling towers: Construction principles • loading and internal stress variables • shape optimization • instability and vibrations • damage and life-duration
3. Solar updraft power plant chimneys: Construction principles • shell strength versus ring stiffening • instability and vibrations
4. Conclusions
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-41
Small solar tower of 500m of height
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-36
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-37
Instability modes: 500m tower without stiffenings rings (G+W+S)
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-38
Instability modes for 500m tower with 4 stiffenings rings (G+W+S)
Artist’s view of large solar chimney power plant
Acc
. Stin
nes
(Gre
enTo
wer
Ltd.
): S
hort
Exe
cutiv
e S
umm
ary
June
200
7
cooling towers to solar chimneys
Krätzig & Partner Ingenieurgesellschaft für Bautechnik mbHK & P 08/3-30
From high natural draft cooling towers to solar chimneys
Maximum Electrical Power OutputFirst semester - 21st of each month
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0 5 10 15 20Solar time
Pow
er [M
W]
JanFebMarAprMayJun
Results: Power outputA
cc. K
roeg
er/P
raet
oriu
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niv.
Ste
llenb
osch
): S
olar
Chi
mne
y P
ower
Pla
nt P
erfo
rman
ce
• Plastic covered water tanks• Provide more uniform daily power output profile (static control)• Relatively shallow tanks• Covered with transparent plastic (no water evaporation)• Black inside bottom• Insulated outside bottom and sides (no heat losses to environment)
Regulating plant power output according to demand (cont.)
Acc
. Kro
eger
/Pra
etor
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(Uni
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Pow
er [M
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Reference plant (Jun)Reference plant (Dec)1/2 Area water tanks (Jun)1/2 Area water tanks (Dec)3/4 Area water tanks (Jun)3/4 Area water tanks (Dec)Full Area water tanks (Jun)Full Area water tanks (Dec)