Mono-axis vs Bi-axis Tracking for a String of Photovoltaic Modules
DOI:
https://doi.org/10.24084/repqj09.696Abstract
This paper presents a comparative study of
motion laws applied to a mono-axis string of photovoltaic
modules and to a bi-axis system. This study will reveal which
system is more efficient (inclusive economically) in the
geographical area of Braşov and under which conditions. There
are two types of tracking systems: mono-axis and bi-axis, the
last being split into other three types of tracking systems
according to their rotation axis. First the solar angles and direct
solar radiation are computed and graphically modeled. Further
the optimum elevation and daily angles are determined. For
each interval both tracking efficiencies are calculated and then
compared. Also, the yearly tracking efficiencies of mono-axis
and bi-axis systems are compared. Taking into account the
technical and economical aspects, beside the energy gain of the
dual-axis tracking system, it was concluded that a mono-axis
system is preferred for the studied geographical area.