Heat exchanger

Patent metadata

Field	Value
Publication number	US-9234704-B2
Application number	US-201414290478-A
Country	US
Kind code	B2
Filing date	May 29, 2014
Priority date	May 18, 2004
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

A heat exchanger 10 includes a conduit 12 for conveying cooling fluid relative to a body to be cooled. A heat transfer arrangement 62 is arranged in communication with an interior of the conduit 12 , the heat transfer arrangement 62 and the conduit 12 together defining an assembly that is mountable adjacent the body to be cooled, convective heat exchange occurring, in use, due to movement of the cooling fluid relative to the body and to the heat transfer arrangement 62 of the assembly and radiant heat exchange occurring between the body and at least part of the heat transfer arrangement 62 of the assembly.

First claim

The invention claimed is:

1. A heat exchanger which includes a conduit for conveying heat exchange gas relative to a device; and at least one duct in communication with an interior of the conduit, the at least one duct, in use, being positioned adjacent an external surface of an external wall of the device to form, together with the wall of the device, a passage through which the heat exchange gas is able to pass, the conduit and the at least one duct together defining an assembly that is mountable, in use, adjacent to, and externally of, the device, whereby radiant heat exchange occurs between the device and the at least one duct and convective heat exchange occurs due to movement of the heat exchange gas relative to the device and to the at least one duct, the duct further comprising heat transfer enhancing parts in the form of vortex inducing components arranged on an inner side of a wall of the at least one duct to lie within a flow path of the heat exchange gas in the passage to cause vortices to be developed in the heat exchange gas thereby to reduce formation of thermal boundary layers and thereby to enhance at least convective heat transfer between the at least one duct and the heat exchange gas.

2. The heat exchanger of claim 1 in which the duct is channel-shaped having an open side with the wall of the furnace closing off the open side to form the passage in use.

3. The heat exchanger of claim 1 in which the heat transfer enhancing parts further comprise surface area increasing components.

4. The heat exchanger of claim 3 in which the surface area increasing components comprise fins.

5. The heat exchange of claim 4 in which the fins are shaped to reduce thermal boundary layers.

6. The heat exchanger of claim 1 in which an orifice is associated with each of at least some of the vortex inducing components further to enhance heat transfer.

7. The heat exchanger of claim 1 in which an inlet opening of the at least one duct is shaped to reduce a pressure drop associated with entry of the heat exchange gas into an interior of the at least duct.

8. The heat exchanger of claim 1 in which the at least one duct has a primary outlet opening through which the heat exchange gas enters into the conduit and a secondary exit opening through which some of the heat exchange gas can pass to assist in natural convective heat exchange.

9. The heat exchanger of claim 1 in which the heat exchange gas is air.

10. An assembly comprising a device; and a heat exchanger mounted to the device, the heat exchanger comprising a conduit for conveying heat exchange gas relative to the device; and at least one duct in communication with an interior of the conduit, the at least one duct, in use, being positioned adjacent an external surface of an external wall of the device to form, together with the wall of the device, a passage through which the heat exchange gas can pass, the conduit and the at least one duct together defining an assembly that is mountable, in use, adjacent to, and externally of, the device to be cooled, whereby radiant heat exchange occurs between the device and the at least one duct and convective heat exchange occurs due to movement of the heat exchange gas relative to the device and to the at least one duct, the duct further comprising heat transfer enhancing parts in the form of vortex inducing components arranged on an inner side of a wall of the at least one duct to lie within a flow path of the heat exchange gas in the passage to cause vortices to be developed in the heat exchange gas to reduce formation of thermal boundary layers and thereby to enhance at least convective heat transfer between the at least one duct and the heat exchange gas.

Assignees

• Auckland Uniservices Ltd

Inventors

• Taylor Mark P
• Chen John Jj
• Farid Mohamed
• Wallace Robert John

Classifications

• F27D2009/0005

  the cooling medium being a gas · CPC title

• C25C3/085

  characterised by its non electrically conducting heat insulating parts · CPC title

• F27D9/00 Primary

  Cooling of furnaces or of charges therein (casings, linings, walls or roofs incorporating cooling arrangements F27D1/12) · CPC title

• C21B7/106

  Cooling of the furnace bottom · CPC title

• F27D2009/0013

  the fluid being water · CPC title