Solar heat collector assembly

摘要

A solar heat collector assembly includes a cylindrical transparent tube having an open end portion hermetically sealed by the use of a sealant and being held in vacuum state and a heat-collecting pipe secured in the transparent tube with its end portion extending outside the transparent tube through the sealant. The sealant is made of a thermally-nonconducting and anti-corrosion material with a softening point higher than that of the transparent tube. Especially, the sealant is made of ceramics or crystallized glass.