EPEEnergy and Power Engineering1949-243XScientific Research Publishing10.4236/epe.2015.76024EPE-57113ArticlesEngineering Erratum to “Improving the Power Generation Performance of a Solar Tower Using Thermal Updraft Wind” [Energy and Power Engineering Vol. 6 No. 11 (October 2014) 362-370] asatakaMotoyama1YujiOhya2TakashiKarasudani2TomoyukiNagai2KenichiroSugitani2ShinsukeOkada1Research Institute for Applied Mechanics, Kyushu University, Fukuoka, JapanDepartment of Aeronautics and Astronautics Engineering, Kyushu University, Fukuoka, Japan12062015070625525712 July 201429 August 2014 8 September 2014© Copyright 2014 by authors and Scientific Research Publishing Inc. 2014This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/

The original online version of this article (Masataka Motoyama, Kenichiro Sugitani, Yuji Ohya, et al. (2014) “Improving the Power Generation Performance of a Solar Tower Using Thermal Updraft Wind”, 2014, 6, 362-370. http://dx.doi.org/10.4236/epe.2014.611031) was published in October, 2014.The author wishes to correct the following error in text and Figures 9-11.

Solar Tower Thermal Updraft Wind Turbine Diffuser6. Conclusions

The purpose of this research is to focus on the shape of the solar tower, and increase the power output by changing the structure from the conventional cylindrical tower to a diffuser type tower, thus increasing the power output.

As a result of previous preliminary experiments conducted by Okada, the mini-model of a diffuser type tower achieved greater wind velocity than a cylindrical tower. In these experiments, we made the size of the model 5 times larger than the mini-model. By installing a wind turbine, we actually measured the obtained power output and verified it.

Temperature difference vs. power

1) Initially, similar to the mini-model, we measured the wind velocity of the diffuser and cylindrical towers without a wind turbine. As the result, the wind velocity for the diffuser tower was greater than that for the cylindrical tower by a factor of 1.5 - 1.8 times. The velocity of this model was almost √5 times greater than that for the mini-model. A scaling law was established for the solar tower.

2) Next, by installing a wind turbine, the change in velocity and power output was measured. The ratio of velocity between the diffuser and cylindrical towers was almost 1.4 - 1.5, similar to the case for the temperature difference ?θ without a wind turbine. Because the power output was proportional to the cube of the velocity, the power output obtained in the diffuser tower was 4 times greater than that for the cylindrical tower.

From these results, we concluded that the diffuser tower, which had the advantage of a larger power output than the cylindrical tower, was the preferred option for a solar tower.

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