A THEORETICAL STUDY OF A THERmOSYPHON SOLAR TOWER

El-Haroun, A. A.

doi:10.21608/erjm.1998.73023

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“…Therefore the recent researches attempt to study how to increase the wind speed at the inlet of wind turbine by using different ways [5]. Some of them investigate the use of solar energy to increase the velocity of air flowing through tall tower connected with large collector [6,7], or through only tall tower without collector, which named thermosyphon solar tower [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…In references [8,9], the effect of different parameters on the performance of thermosyphon solar tower was studied theoretically. In the previous works the effect of wind speed at the top of the tower was not studied and there is a need to study this effect on the performance of thermosyphon solar tower and on the energy generated from solar turbine.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Wind Speed at the Top of the Tower on the Performance and Energy Generated From Thermosyphon Solar Turbine

El-Haroun

2001

ERJ. Engineering Research Journal

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Energy generated from wind turbine depends to a great extent on the wind speed at its inlet. The use of thermosyphon solar tower is an attempt to increase the air velocity at inlet of the wind turbine and of course to increase its power. The wind speed in a certain location changes always with time and with the height above ground surface. In this work, the effect of wind speed at the top of the tower on the performance as well as on the energy generated from therrnosyphon solar turbine was studied theoretically. One location in Egypt was chosen for this study. The calculations were achieved mainly with the solar turbine located at tower bottom. For the purpose of comparison, the energy generated from the solar turbine was compared with that generated from free wind turbine at tower height with the absence of solar tower. It was found that, the wind speed at the top of the tower results in a pressure drop which affects the performance of the thermosyphon solar turbine. This pressure drop increases with the rise in wind speed and will be zero only when the wind speed at the top of the tower reaches zero. It was also found that, there is an increase in friction losses through the tower and a decrease in both temperature difference between inlet and outlet of the tower and in heat losses from tower walls with the rise in wind speed. The inlet air velocity to the solar turbine and consequently its specific power were found to be increased with the increase in wind speed at the top of the tower. Therefore, the effect of wind speed at the top of the tower must be taken into account during therrnosyphon solar tower calculations. By comparing the performance of solar turbine and the free wind turbine located at tower height with the absence of thermosyphon solar tower, it was found that the mean inlet air velocity to the solar turbine located at tower bottom and consequently its specific power are higher than those values for free wind turbine. The increase in mean inlet air velocity to the solar turbine is found to be 17 % of its value for a free wind turbine.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%