Abstract
An experimental study was performed to investigate the effect of using a continuous operation two-axes tracking on the solar heat energy collected. This heat-collection sun tracking which LDR (light dependent resistor) sensors installed on the Fersnel lens was used to control the tracking path of the sun with programming method of control with a closed loop system. The control hardware was connected to a computer through Zigbee wireless module and it also can monitor the whole tracking process information on a computer screen. An experimental study was performed to investigate the effect of using two-axes tracking on the solar heat energy collected. The results indicate that sun tracking systems are being increasingly employed to enhance the efficiency of heat collection by polar-axis tracking of the sun. Besides, the heating power was also measured by designed power measurement module at the different focal length of Fresnel lens, and the design of shadow mask of LDR sensors is an important factor for solar photothermal applications. Moreover, the results also indicated that the best time to obtain the largest solar irradiation power is during 11:00 –13:00 in Taiwan.
Highlights
Because of the energy crisis and the environmental awareness, to develop renewable energies has become one of the important targets in the future
We found that the tracking time of sunlight is strongly dependent on the geometry of shadow mask
In this paper an experimental study is performed to investigate the effect of closed-loop two-axis tracking on the solar heat energy collected for photo-thermal application
Summary
Because of the energy crisis and the environmental awareness, to develop renewable energies has become one of the important targets in the future. The fuzzy rules are tuned by an adaptive neurofuzzy inference system (ANFIS) This open-loop control system is designed for each of the previous types of sun tracking systems and the electrooptical trackers give very good results during good weather conditions. Sungur [16] designed aboth axes sun tracking system with programmable logic control and with the function of solar azimuth angle and solar altitude angle to follow the sun’s position He found that the energy more than 42.6% in the two-axes sun-tracking system was obtained when compared to the fixed system. Bakos [18] developed the two-axes tracking using a continuous operation on the solar energy collected He set the position of the photoresistors and the results indicate that solar energy on the moving surface was significantly larger (up to 46.46%) than the fixed surface. We design the active two-axis solar tracker with Fresnel lens to collect the thermal power of solar efficiently and to offer a steady heat source for photo-thermal applications
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