Jianfeng, Lu; Jing, Ding; Jianping, Yang - In: Renewable Energy 35 (2010) 7, pp. 1477-1483
radiation, the energy absorption efficiency has a maximum at optimal incident energy flux. As the pipe radius decreases or flow … velocity rises, the wall temperature drops for higher heat transfer coefficient, while the heat absorption efficiency increases …. Along the flow direction, the heat absorption efficiency almost linearly decreases, while the exergetic efficiency will …