Colector de cilindro que comprende una region focal y un tubo absorbente dispuesto en la region focal, con una region de aislamiento que se extiende hacia adentro desde una superficie exterior que rodea un canal de transporte para un medio que transporta calor que corre longitudinalmente a traves del tubo absorbente; tubo absorbente para un colector de cilindro; colector de cilindro que tiene un concentrador lineal

摘要

The invention relates to a trough collector having a focal area and an absorber tube arranged in the focal area, said absorber tube having an insulating area that extends from its outer surface to the inside, enclosing preferably a transport channel that runs through the absorber tube along its length and carries a heat-transporting medium, and is penetrated by at least one thermal opening that extends radially from the outside through the insulating area to the transport channel. According to the invention, the at least one thermal opening comprises a constriction for radiation passing through it, the focal area being located in the constriction.