AbstractRay tracing simulations of focusing (parabolictrough) and nonfocusing (clrcular cyl1ndrical) line concentrating solar collectors with tubular absorbers were performed. The energy absorbed by the receiver tube for incident solar beam radiation was calculated over the length of a given day and shown as a function of the solar hour angle. East-west and north-south orientations were compared. The effects of siz1ng and geometry of the collector components was investigated for each collector .Simulations were also performed with varying collector reflector rim angles .