Rhombic intensified heat exchange trbe

Abstract

Diamond intensified heat exchange tube is composed of several diamond pipe runs, ellipase runs, round-ellipse transitions, in which, sections of diamond pipe run at both ends are ellipse with crossed long shaft of an angle of 15-90 deg. changing from both ends to the center and ellipticity of the section gets smaller steadiry until the center section turns to round. The ellipse pipe run is at both ends of each diamond divided into two groups of positive and bias. Inner and outer surface of the diamond can be either smooth or few ribs or screw. Advantage; obvious heat-conversion strengthening action with little increase of flow resistance, not easy to be sintered.

Description

technical field [0001] The invention relates to an enhanced heat exchange element, in particular to a diamond-shaped enhanced heat exchange tube, which belongs to the technical field of heat exchange enhancement and heat exchangers. Background technique [0002] Shell and tube heat exchangers (including sleeve and tube heat exchangers) are one of the most widely used heat exchangers in the heat exchanger family. Although it has a long history and relatively old technology, it is still used in petroleum, chemical, power and other industries because of its relatively simple manufacturing technology, easy access to materials, relatively low cost, and its ability to adapt to high temperature and high pressure conditions. widely used in the sector. On the other hand, people are also making continuous efforts to improve it, especially inventing various enhanced heat exchange tubes instead of ordinary round tubes to manufacture shell-and-tube heat exchangers to overcome its low he...

AI Technical Summary

Problems solved by technology

Although the existing technology has obvious effects in enhancing heat transfer, there are also some shortcomings: first, some intensified tubes increase more flow resistance or power consumption while enhancing heat transfer, so from the perspective of effective energy utilization From a point of view, the benefits are not large, and the second is that the manufacturing cost of some reinforced tubes increases a lot and the heat exchange area does not decrease so much that the economic benefits are not obvious enough.

However, it is found through research that the synergy between the fluid velocity field and the temperature gradient field is only good near the inlet of the elliptical pipe section, and is far from ideal in other places, so there is still a lot of room for improvement in its heat transfer performance.

Images