Evacuated solar collector tube

Details Evacuated solar collector tube Evacuated solar collector tube

1988-10-14

1991-01-29

Yeung, James C.

Stoves and furnaces

Tool having fluid fuel burner

Curling iron

F24J 224

Patent

active

049878832

ABSTRACT:
The present invention has two tubes arranged concentrically and separated by a vacuum. The internal tube is of thin wall steel construction with a selective absorbing coating. The external tube is a hard glass material such as, for example, Pyrex. The vacuum tight seal between the concentric tubes consists of an accordian-pleated semi-rigid material such as copper connected to the inner tube. The semi-rigid material is then fused to a thermally insulating, vacuum tight spacer. Finally, the spacer is fused to the outer glass tube. Additional shatter protection may be derived from a reflective coating extending from midway along the ceramic spacer over the ceramic-glass seal, and along the glass for several inches.

REFERENCES:
patent: 1946184 (1934-02-01), Abbot
patent: 4326503 (1982-04-01), Geier et al.
patent: 4409964 (1983-10-01), Shimada et al.

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