System and Method for Manufacturing and Operating a Coaxial Tube Heat Exchanger

A method for manufacturing a coaxial heat exchanger, the method comprising:

• obtaining an engineered inner tube comprising an interior surface and an exterior surface, wherein the interior surface and exterior surface of the engineered inner tube are textured;
• positioning an intermediate member comprising an interior and an exterior axially outboard of the engineer inner tube;
• positioning the intermediate member and engineered inner tube within an outer jacket;
• and
• deforming at least one of the engineered inner tube, intermediate member, or outer jacket to increase thermal transfer between the engineered inner tube and the intermediate member.

A water source heat pump comprising:

• a compressor in fluid communication with a refrigerant line;
• a reversing valve configured to adjust the direction of refrigerant flowing in at least a portion of the refrigerant line;
• a water line wherein the water line is in thermal communication with the outside environment;
• and
• a coaxial heat exchanger comprising:
• an inner tube in fluid communication with the water line, wherein the inner tube has a textured interior and exterior surface;
• an intermediate member positioned outboard of the inner tube wherein the intermediate member has a folded fin structure;
• and
• an outer jacket positioned outboard of the intermediate member to define a volume between intermediate member and the outer jacket, the volume being in fluid communication with the refrigerant line.