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The Solar Tower

The Solar Tower. By Dr Timothy W. Schmidt University of Sydney AUSTRALIA. Principles of operation Carbon cost of manufacture $$ cost and carbon credits. http://notes.chem.usyd.edu.au/course/schmidtt/chem3adv/Chem%203%20(adv)-3.ppt. Solar radiation. 1. Principles of operation. 1000m.

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The Solar Tower

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  1. The Solar Tower By Dr Timothy W. SchmidtUniversity of SydneyAUSTRALIA • Principles of operation • Carbon cost of manufacture • $$ cost and carbon credits http://notes.chem.usyd.edu.au/course/schmidtt/chem3adv/Chem%203%20(adv)-3.ppt

  2. Solar radiation 1. Principles of operation 1000m Hot air Wind turbines

  3. 1. Principles of operation • Glass panels trap heated air – the real greenhouse effect! • 50°C typical. Peak flux averaged over 24h Peak flux (instant equilibration)

  4. 1. Principles of operation Light air column Assume T const Heavy air column

  5. 1. Principles of operation Designers say 200MW This requires the air in the base of the tower to be moving at 221m/s… unless I am mistaken. problem Kinetic energy in air mass the real air flow in this chimney is 10 to 15 m/s a pressure gap exists between upstream and downstream the turbine. The theoretical power output (before subtracting various losses) is equal to this pressure gap multiplied by the voluminal air flow, in m³/s. This pressure gap calculates as in the hydrostatic problem, by integrating, over the whole chimney height, the voluminal weight difference between outside and inside the chimney. 59%×0.5p×602.rv2 =4MW 120m

  6. 2. Carbon cost of manufacture • Glass panels! • 20,000,000 m2 • 100,000 kg • 1.3 TJ • OK – • only 2h of operation 5g/m² ratio for the glass cover seem underestimated => more then 2h Source: www.greenhouse.gov.au

  7. 2. Carbon cost of manufacture • Tower • 1,000 m • 2,000,000 m3 concrete • 4.6 Tg • 26 PJ • 8 years of power • OK In reinforced concrete only two components are CO2 unfriendly: the steel reinforcement, and the cement powder. The others (sand, pebbles, water) have no carbon cost.=> "8 years" is overestimated. Source: www.greenhouse.gov.au

  8. 3. $ cost • Tower cost estimated at 170 M€ • 2,000,000 m3 concrete = 30M€ • Add labour – plausible • Glass $10/m2 • $200M = 140M € • Add labour – plausible

  9. 3. $ cost • 200 MW power station • 680 GWh/a • We get 905 kWh/tonne CO2 • Abate 750,000 tonnes CO2/a • Can sell for 20 € • 15M€ pa

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