HEAT TRANSFER TUBE, HEATING SYSTEM, VENTILATION, AIR CONDITIONING AND REFRIGERATION, AND METHOD FOR FORMING A HEAT TRANSFER TUBE.

摘要

a heat transfer tube for a heating, ventilation, air conditioning and cooling system includes an inner tube surface that defines an interior of the heat transfer tube, a plurality of first fins extending from the inner surface of the tube from the inside of the heat transfer tube that defines a plurality of first grooves between the first adjacent fins and a plurality of second fins extending from the first fins, defining a plurality of second grooves between the adjacent second fins and defining a plurality of recessed cavities in the first grooves, below the second fins.