engleski

Available energy of the air in solar chimneys and the posisibility of its ground level concetration

Solar chimneys are described as low temperature solar thermal power plants, which use the atmospheric air as a working fluid, where only one part of the thermodynamic cycle is utilized within the plant. The available work potential that atmospheric air acquires while passing through the collector has been determined and analysed. The dependence of the work potential of the air flowing into the air collector on the heat gained inside the collector, air humidity and atmospheric pressure as a function of elevation is determined. Various collector types using dry and humid air have been analyzed. The influence of various chimneys and different plant efficiencies on the air work potential is established. The possible higher utilization factors of the available hot air energy potential without use of high solid chimneys were discussed. It has been shown that vortex flow motion downstream of the turbine maintains under pressure and can possibly take over the role of the solid structure chimney. Thus, a part of an available energy potential acquired in the collector will be used to maintain the vortex flow in the air column above the ground-level turbine. Basic conditions for the maintenance of such a flow regime are described and compared to the phenomenon of a tornado.

Solar chimney; availability; vortex

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