Line-focusing Concentrator

a system that tracks the path of the sun by pivoting on one axis (typically East-West orNorth-South), using shiny parabolic troughs to heat the collector fluid that passes througha tube at the focus. It derives its name from the fact that solar radiation is focusedon a line instead of on a point. Below is an illustration from theSolar Radiation Data Manual for Flat Plate and ConcentratingCollectors .