Heat transmission-improvable tubular solar heat absorber with built-in pin fin groups

The invention provides a heat transmission-improvable tubular solar heat absorber with built-in pin fin groups, and belongs to the technical field of solar utilization.The tubular solar heat absorber comprises a vacuum glass cover and a metal tube installed in the vacuum glass cover, a vacuum area is formed between the metal tube and the vacuum glass cover, and a heat transmission fluid channel is formed in the metal tube; the inner wall of the lower half section of the metal tube is provided with the pin fin groups which are uniformly distributed along the lower half section of the metal tube.According to the tubular solar heat absorber, by internally arranging the pin fin groups on purpose to increase turbulent flow in a flow area with the large heat flow density to destroy a flowing boundary layer, the purposes of enhancing heat exchange and homogenizing a temperature field are achieved, heat strain is reduced, the reliability of a heat exchanger is improved, and the average Nusselt number (Nu) is increase