Flooded type evaporating heat-exchange copper tube for an electrical refrigeration unit

A flooded type evaporating heat-exchange copper tube for an electrical refrigeration unit, comprising a smooth surface portion, a finned portion provided with plurality of fins and a transitional portion connecting the smooth surface portion with the finned portion, with a primary evaporating chambers defined between the fins, characterized in that:

• fifth fins extending upwardly are provided on bottom wall of the primary evaporating chamber, which divide the primary evaporating chamber into at least two minor cavities, and in that:
• an evaporating opening is defined between adjacent fins of the primary evaporating chamber, and in that:
• secondary grooves perpendicular to the axis of the evaporating heat-exchange tube are also provided on the finned portion, and characterized in that:
• the depth of the secondary groove is between 0.15 and 0.35 mm, the width of the secondary groove is between 0.15 and 0.25 mm, and the number of the secondary groove provided on a complete round of the tube is between 60 and 125.

A flooded type evaporating heat-exchange copper tube for an electrical refrigeration unit, comprising a smooth surface portion, a finned portion provided with plurality of fins and a transitional portion connecting the smooth surface portion with the finned portion, with a primary evaporating chambers defined between the fins, characterized in that:

• fifth fins extending upwardly are provided on bottom wall of the primary evaporating chamber, which divide the primary evaporating chamber into at least two minor cavities, and characterized in that:
• an evaporating opening is defined between adjacent fins of the primary evaporating chamber, characterized in that:
• an inner surface of the evaporating heat-exchange tube is further provided with inner teeth, and characterized in that:
• the number of the inner teeth per inch is between 30 and 60, the height of the inner teeth is between 0.2 and 0.4 mm, the pitch angle for the inner teeth is between 30° and 60° , and the addendum angle for the inner teeth is between 30° and 60°.