Heat transfer apparatus with enhanced micro-channel heat transfer tubing

摘要

Heat exchange apparatus includes elliptical cross section heat exchange tubing provided with a partition dividing the interior of the tubing into at least two parallel flow passages. The flow passages are delimited by inwardly projecting fins formed on the tubing wall and on the partition, the fins extending parallel to each other and having a height less than the anticipated thickness of the velocity boundary layer of heat exchange fluid flowing through the tubing passages. The tubing may be arranged in serpentine or coiled arrangements of the heat exchange apparatus or parallel tubes extending between heat exchanger header tanks. The heat exchange apparatus is particularly adapted for use in HVAC systems.