Heat exchanger

US4694896A · kind A · utility

Inventor

• Frank Navratil · Winnipeg, CA

Key dates

• Filing date: Oct 22, 1986
• Grant date: Sep 22, 1987
• Expiry date: Oct 22, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F28D7/106
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A heat exchanger preferably of the type for heating water from hot gases or steam comprises first and second tubes arranged concentrically so as to define a channel inside the first tube, an annular channel between the tubes and a further channel outside the outer tube. The hot gases are arranged to pass inside the inner tube and outside the outer tubes so that water passing through the annular channel is heated from both the inner and outer surfaces. Such an arrangement can be built up into a total heat exchanger by an array of such co-axial tubes arranged side by side or by an array of such co-axial tubes arranged co-axially, that is with further tubes outside the outer tube. Baffles in the form of radial fins cause the fluid to move along an underside of the baffle toward a closed end and then to turn at the closed end back along an upper side of the baffles toward the outlet.