CIESC Journal ›› 2016, Vol. 67 ›› Issue (S1): 134-141.doi: 10.11949/j.issn.0438-1157.20160621

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Triangular winglet strengthen heat transfer characteristics of solar chimney power plants with vertical collectors

ZHOU Yan, DONG Haoran, WANG Li, LI Qingling   

  1. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, Shandong, China
  • Received:2016-05-09 Revised:2016-05-19 Online:2016-08-31 Published:2016-08-31
  • Supported by:

    supported by the National Natural Science Foundation of China (51176080).

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Abstract:

In this paper,triangular winglets strengthening the unsteady natural convection flow and heat transfer, which were set up on the collector surface in the solar chimney power plant system, was researched with numerical methods. The number of ribs, rib inclination and arrangement influence on the temperature and velocity difference of the airflow between the inlet and outlet were analyzed. And heat effects of the triangular winglets were evaluated combining with the principle of field synergy. The results show that:With air flowed through the triangular winglets, the temperature gradient increases, the heat transfer is enhanced, the temperature and velocity difference of the airflow between the inlet and outlet increases sharply. As the number of ribs increased, the synergy angle between velocity and temperature gradient decreased because the disturbed effect enhanced, but energy loss increased as the flow friction increased, and when rib inclination is 45°, the velocity difference between inlet and outlet is the largest. With triangular winglets arranged in the vertical rectangular channel, staggered arrangement is better than the aligned.

Key words: solar chimney power plant system with vertical heat collectors, field synergy principle, numerical simulation, triangular winglets, flow, heat transfer

CLC Number: 

  • TQ028.8
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