Heat transfer pipe for condensation

Abstract

The invention provides a heat transfer pipe used for condensation. Fins which can increase the heat exchange area are pressed on the external surface of the heat transfer pipe. The heat transfer pipe is characterized in that two or more than two layers of fin platforms in composite structure are pressed on the fins; fin slots are arranged between the fin platforms; the fin platforms can be L-shaped, three-step-shaped, V-shaped, Y-shaped or in the shape with one square above and in the middle of the two squares. As the steps on the side walls of the fin platforms or the turning points multipled in number formed based on the slots on the top of the fin platforms through processing play a role in condensation and reinforcement of heat transfer, the heat exchange performance of the condensation side of the heat transfer pipe is improved by 6.5 to 15.0 percent compared with the prior art according to the test results by adopting R134a for condensation.

Description

technical field [0001] The invention belongs to the technical field of heat transfer equipment, and in particular relates to a heat transfer tube for condensation. Background technique [0002] In refrigeration and air conditioning and related industries, water-cooled condensers have been widely used. Most of them are shell and tube heat exchangers, in which the refrigerant condenses outside the tube to exchange heat, and the coolant (such as water) flows in the tube to exchange heat. Because the thermal resistance of the refrigerant side accounts for the main part, it is necessary to adopt enhanced heat transfer technology on this side. For the phase change heat transfer of condensation, there are many heat transfer tubes specially for this type of process: such as heat transfer for condensation enhanced surface The tube has US patent US5996686 and US patent US5669441. It forms fins on the outer surface of the tube by machining and knurling on the top of the wing. The main...

AI Technical Summary

Problems solved by technology

[0003] Generally, people make such heat transfer tubes as, for example, figure 1 , figure 2 , image 3 As shown in Fig. 1, ring-shaped fins are pressed on the outer surface of the heat transfer tube, and then fin grooves are pressed on the fins to form a fin table, which increases the heat transfer area to a certain extent, but still cannot further improve the heat transfer efficiency.

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