Method of fabricating heat transfer conduits

US4236288A · kind A · utility

Assignee

• Kabel- und Metallwerke Gutehoffnungshutte AG · DE

Inventor

• Peter Rohner · Lüneburg, DE

Key dates

• Filing date: Jul 16, 1979
• Grant date: Dec 2, 1980
• Expiry date: Jul 16, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49353
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method of fabricating a plurality of heat transfer conduits is disclosed wherein an elongated metal pipe is evacuated, a predetermined quantity of heat transfer fluid is placed within such evacuated pipe and the pipe ends sealed airtight. The elongated sealed pipe is wound in a helical or serpentine configuration, the lower vertical portions of the so configured pipe are heated so that the liquid phase of the heat transfer fluid is evaporated and redistributed in an even manner in the lower vertical portions of successive convolutions of such pipe, and is then flattened, for example, at each of its upper vertical portions to form vacuum-tight seals between adjacent convolutions. A cutting procedure across each of the flattened upper portions (or selected ones of such flattened upper portions) enables a separation of the elongated sealed pipe into a plurality of heat transfer conduits without the necessity of a further evacuation procedure.