研究目的
To investigate the annual accumulated parasitic energy losses in photovoltaic (PV) or concentrator photovoltaic (CPV) system installed in a dual-axis solar tracker located at various locations with latitudes ranging from 45°N to 45°S and to optimize the PV/CPV system performance by determining the least parasitic energy loss in the cases of fixed and non-fixed stow positions.
研究成果
The solar tracker with non-fixed stow position has lower annual accumulated parasitic energy losses compared to that of fixed stow position, with a percentage difference ranging between 33.8 % and 41.0 %. The dual-axis AE solar tracker with non-fixed stow position is preferred for PV/CPV systems in all locations, especially for higher latitudes.
研究不足
The study is limited to latitudes ranging from 45°N to 45°S and does not account for variations in weather conditions or the impact of dust and other environmental factors on the solar tracker's performance.
1：Experimental Design and Method Selection:
The study applied the general sun-tracking formula to compute the sun-tracking angles, i.e. azimuth (β) and elevation (α) angles, essential in calculating the accumulated ROM of the AE solar tracker. Algorithms were developed to evaluate the annual accumulated ROM of the solar tracker with respect to various site locations for different latitudes ranging from 45°N to 45°S. Two stow conditions, fixed and non-fixed stow positions, were considered.
2：Sample Selection and Data Sources:
The study considered a CPV system with a reflective area of 25 m2, optical efficiency of 85 %, and electrical conversion efficiency of 30 %. The local irradiation data were acquired from ASHRAE IWEC2 weather data.
3：List of Experimental Equipment and Materials:
A CPV system with specified reflective area and efficiencies, dual-axis solar tracker with azimuth and elevation motors, gear train with a gear ratio of 4400, and power consumption of primary and secondary motors of 99 W and 66 W respectively.
4：Experimental Procedures and Operational Workflow:
The study involved computing the daily and annual accumulated ROM for the PV/CPV system, considering fixed and non-fixed stow positions, and calculating the parasitic energy losses from the motors.
5：Data Analysis Methods:
The parasitic energy losses were calculated based on the ROM, power consumption, rotational speed of the motors, and gear ratio of the gear train. The annual generated electrical energy was estimated based on local irradiation data.
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