ZONNEWARMTE VERZAMELENDE INRICHTING.

摘要

A solar heat collecting apparatus comprises at least one heat collecting element comprising a cylindrical outer member in which at least its circumferential wall has permeability to solar radiant energy and the two end faces of the cylinder are closed, a cylindrical inner member disposed in the outer member with the interposition of a thermal insulating space with its either end protruding beyond each end face of the outer member, an absorbing means for absorbing the difference between the amounts of heat expansion and contraction of the outer and inner members, the two members and the means being integrally formed.