Elliptical perforated fins for finned tube refrigeration heat exchangers suitable for frosting conditions

Abstract

The invention provides an oval punching fin suitable for a finned tube type refrigeration heat exchanger under the frosting condition. A plurality of refrigeration base tube holes are evenly formed in the center axis of the height direction of the fin. A plurality of oval holes are formed in the surface of the fin. In the height direction of the fin, all the oval holes are formed in three columns and are the same in physical dimension. Two columns of oval holes are located in the airflow inlet side and the airflow outlet side of the surface of the fin respectively. The long axis of each oval hole in the airflow inlet side is parallel with the airflow direction and perpendicular to the long axis of each oval hole in the airflow outlet side in direction. Another column of oval holes are located between the refrigeration base tube holes, and the long axis of each oval hole is parallel with the long axis of each oval hole in the airflow outlet side in direction. The heat exchange performance of the finned tube type refrigeration heat exchanger under the frosting condition is enhanced. Compared with a traditional refrigeration heat exchanger of a finned structure, the finned tube type refrigeration heat exchanger can achieve the purposes of saving energy, reducing flowing resistance of the air side, saving metal materials of the fin and reducing the size under the same refrigerating capacity.

Description

technical field [0001] The invention relates to a refrigeration heat exchanger, in particular to a fin structure of the refrigeration heat exchanger. Background technique [0002] At present, the finned tube refrigeration heat exchangers that work for a long time under frosting conditions basically use flat fins, and some use corrugated fins. The main function of flat fins is to expand the heat transfer surface, which has little effect on promoting fluid disturbance, and the heat transfer effect is not ideal. Reinforced fins such as slit fins and louver fins, under frosting conditions, the formation of a frost layer will block the narrow gaps on the fins, thereby making them lose the ability to enhance heat transfer, and the air flow on the surface of the fins will Resistance will also increase. Finned tube refrigeration heat exchangers that work for a long time under frosting conditions must be defrosted frequently, and multiple defrosts will increase energy consumption. ...

AI Technical Summary

Problems solved by technology

[0004] However, this structure still has the following deficiencies: After analyzing the weak area of ​​convective heat transfer on the fin surface, the size, position, and shape of the openings on the fin surface are directly determined, and the shape of the openings and the effect of disturbing flow are not analyzed. In-depth and extensive optimization analysis of factors affecting heat transfer effect

Therefore, although the fin form can improve the heat transfer effect to a certain extent, there is still room for further improvement in terms of enhancing heat transfer capacity and reducing flow resistance.

Images