S. Yu. Korotunov, O. V. Korotunova, O. E. Narivskyi


The production of clean energy is a topical issue nowadays. The utilization of renewable energy sources, including solar, in the national economy gives an opportunity to partially solve the problem of environmental pollution, reduce dependence on price growth and the exhaustion of traditional energy sources. In addition, a large number of types of industry use thermochemical processes during theirs operation. Thus, for these reasons a lot of attention is paid to the implementation of the solar reactors, which have stable efficiency regardless of the weather conditions. The research shows that obtaining and maintaining a quasi-constant high temperature inside the solar reactor is a challenge. This is because the incident solar radiation can fluctuate depending on the position of the sun and weather conditions and significantly hinder stable and efficient operation of the solar reactor. To eliminate this flaw and to increase the efficiency of the reactor one can utilize variable aperture and model predictive control. The developed program controls the aperture size depending on the changes in the solar flux. The proposed program has been tested on the solar simulator capacity of 7 kW. It was found that the temperature inside the reactor rises with increasing force flux solar simulator with the nonlinear dependence. Another temperature rising factor is an enlargement of the aperture diameter. The experiments showed that the time to maintain a quasi-constant temperature also depends on the size of the aperture. In order to maintain a quasi-constant temperature level for each of the input flows, proposed control mechanism calculates the required diameter of the aperture opening. To achieve rapid rotation developed program calculates the closest way both clockwise and counterclockwise. This algorithm provides calculation steps needed to be sent to the stepper motor controller. Change of desired diameter triggers next calculations. Therefore, regardless of the power flow of the solar simulator one can achieve steady state temperature of the reactor by controlling the opening diameter of the aperture. This indicates that the rotation algorithm of the variable aperture of the solar reactor can be recommended for the further software model predictive control development.


solar simulator; renewable energy; semi-constant temperature; controlling program; solar flux; LabVIEW

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