Tube-in-tube unified shell heat exchanger

An annular duct with tube-in-tube unified shell heat exchanger comprising:

• the annular duct defined between an outer case and an inner case about an axis A;
• multiple tube-in-tube unified shell elements mounted to the outer case and extending into the annular duct radially relative to the axis A;
• each of the multiple tube-in-tube unified shell elements comprising:
• an outer tube structure comprising a tube wall defining a first end opposite a second end;
• the outer tube structure comprises an interior surface and an exterior surface opposite the interior surface;
• the interior surface includes an augmentation structure;
• the outer tube structure;
• the outer tube structure comprises an end cap connected to the second end of the tube wall;
• the outer tube structure comprises a top section proximate the first end;
• the top section includes a flange and a flow outlet;
• the tube wall of the outer tube structure connects with the top section proximate the flange to form an integral outer tube structure;
• an inner tube structure including a tubular shaped inner body defining an internal flow area, the inner tube structure including surface features formed on the exterior of the inner tube structure;
• the inner tube structure including a top ring connected to the exterior proximate an inlet port of the inner tube structure;
• inner tube structure includes an outlet port opposite the inlet port;
• wherein the top ring of the inner tube structure is connected with the top section of the outer tube structure;
• and
• a gap formed between the outer tube structure and the inner tube structure, the gap fluidly coupled between the inlet port and the flow outlet.

A process for heat exchange through an annular duct with tube-in-tube unified shell element heat exchanger comprising:

• flowing air through the annular duct defined between an outer case and an inner case about an axis A;
• mounting multiple tube-in-tube unified shell elements to the outer case extending into the annular duct radially relative to the axis A;
• each of the multiple tube-in-tube unified shell elements comprising:
• an outer tube structure comprising a tube wall defining a first end opposite a second end;
• the outer tube structure comprises an interior surface and an exterior surface opposite the interior surface;
• the interior surface includes an augmentation structure;
• the outer tube structure;
• the outer tube structure comprises an end cap connected to the second end of the tube wall;
• the outer tube structure comprises a top section proximate the first end;
• the top section includes a flange and a flow outlet;
• the tube wall of the outer tube structure connects with the top section proximate the flange to form an integral outer tube structure;
• an inner tube structure including a tubular shaped inner body defining an internal flow area, the inner tube structure including surface features formed on the exterior of the inner tube structure;
• the inner tube structure including a top ring connected to the exterior proximate an inlet port of the inner tube structure;
• inner tube structure includes an outlet port opposite the inlet port;
• wherein the top ring of the inner tube structure is connected with the top section of the outer tube structure;
• a gap formed between the outer tube structure and the inner tube structure, fluidly coupling the gap between the inlet port and the flow outlet;
• flowing a working fluid into the inlet port through the inner tube structure;
• and
• flowing the working fluid through the gap and out of the flow outlet.