Drawn polymer fibers for use in thermal applications

A heat exchanger comprising:

• a polymer fiber having a first end and a second end, the polymer fiber comprising:
• one or more fluid delivery channels disposed along a length of the polymer fiber between the first and second ends, the one or more fluid delivery channels configured to carry a fluid having a first temperature from the first end to the second end, with the polymer fiber having an outer wall and having a uniform cross-section along the entire length of the polymer fiber from the first end of the polymer fiber to the second end of the polymer fiber;
• and
• one or more fluid return channels disposed along the length of the polymer fiber with at least one or some of the fluid return channels extending between the first and second ends and configured to return a fluid from the second end of the polymer fiber.

A heat exchanger comprising:

• a single polymer fiber having a first end, a second end, an outer wall and having a uniform cross-section along the entire length of the single polymer fiber from the first end of the single polymer fiber to the second end of the single polymer fiber, the single polymer fiber comprising:
• one or more fluid delivery channels disposed in the single polymer fiber, the one or more fluid delivery channels configured to carry a fluid having a first temperature;
• and
• one or more fluid return channels disposed in the single polymer fiber, the one or more fluid return channels configured to return a fluid from the second end of the single polymer fiber wherein the one or more fluid delivery channels and the one or more fluid return channels are either parallel or perpendicular to each other in the single polymer fiber.