Step tracking program for concentrator solar collectors

7th International Conference on Advanced Concepts in Mechanical Engineering

Ciobanu, D.^1 ; Jaliu, C.^1

Transilvania University of Brasov, Renewable Energy System and Recycling Research Centre, Brasov, Romania^1

关键词: Developed countries;    Direct solar radiation;    Energy productions;    Flat-plate solar collectors;    Parabolic dish concentrator;    Renewable energies;    Solar thermal systems;    Temperate climate;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/147/1/012149/pdf
DOI  :  10.1088/1757-899X/147/1/012149

来源: IOP

【 摘 要 】

The increasing living standards in developed countries lead to increased energy consumption. The fossil fuel consumption and greenhouse gas effect that accompany the energy production can be reduced by using renewable energy. For instance, the solar thermal systems can be used in temperate climates to provide heating during the transient period or cooling during the warmer months. Most used solar thermal systems contain flat plate solar collectors. In order to provide the necessary energy for the house cooling system, the cooling machine uses a working fluid with a high temperature, which can be supplied by dish concentrator collectors. These collectors are continuously rotated towards sun by biaxial tracking systems, process that increases the consumed power. An algorithm for a step tracking program to be used in the orientation of parabolic dish concentrator collectors is proposed in the paper to reduce the consumed power due to actuation. The algorithm is exemplified on a case study: a dish concentrator collector to be implemented in Brasov, Romania, a location with the turbidity factor TR equal to 3. The size of the system is imposed by the environment, the diameter of the dish reflector being of 3 meters. By applying the proposed algorithm, 60 sub-programs are obtained for the step orientation of the parabolic dish collector over the year. Based on the results of the numerical simulations for the step orientation, the efficiency of the direct solar radiation capture on the receptor is up to 99%, while the energy consumption is reduced by almost 80% compared to the continuous actuation of the concentrator solar collector.