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Heat exchanger fin and fin tube type heat exchanger

A technology of heat exchanger and finned tube, which is applied in the field of heat exchanger and its fins, can solve the problems that the thermal conductivity cannot reach the calculated value, and the undisclosed method of determining the three circular arcs, etc., so as to improve the heat transfer efficiency Effect

Inactive Publication Date: 2009-08-19
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the heat transfer efficiency of the fins disclosed in Japanese Patent No. 3356151 is improved compared with L-shaped fins, the determination method of the three arcs is not disclosed
In addition, there are some problems in the calculation formula of the contact thermal conductivity disclosed in the bulletin, and the actual thermal conductivity cannot reach the calculated value

Method used

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  • Heat exchanger fin and fin tube type heat exchanger
  • Heat exchanger fin and fin tube type heat exchanger
  • Heat exchanger fin and fin tube type heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] like Figure 5 As shown in (a), in Embodiment 1, a single control point is used as the optimization variable of the cross-sectional shape of the fin collar. And the section shape of the fin collar is a spline curve passing through three points. That is, take the coordinate value X1 of the middle point of the middle part of the collar 122 in the vertical direction as the control point of the spline curve, and construct the middle point X1 of the middle part of the collar 122 and the first end point of the middle part of the collar 122. A spline curve of three points including X2 and the second end point X3 of the middle portion 122 of the collar. As a result, the Figure 5 (b) The optimized shape shown. Table 1 shows changes in shape before and after optimization in Example 1.

[0059] Table 1

[0060]

Embodiment 2

[0062] like Image 6 As shown in (a), in Example 2, a single control point is used as the optimization variable of the cross-sectional shape of the fin collar. And the section shape of the fin collar is a spline curve passing through five points. That is, take the coordinate value X1 of the middle point of the middle part of the collar 122 in the vertical direction as the control point of the spline curve, and construct the middle point X1 of the middle part of the collar 122 and the first end point of the middle part of the collar 122. A spline curve of five points including X2, the second end point X3 of the collar middle portion 122, the predetermined point C1 of the collar bending end portion 123, and the predetermined point C2 of the collar root portion 121. As a result, the Image 6 (b) The optimized shape shown. Table 2 shows changes in shape before and after optimization in Example 2.

[0063] Table 2

[0064]

Embodiment 3

[0066] like Figure 7 As shown in (a), in Embodiment 3, three control points are used as variables for optimizing the cross-sectional shape of the fin collar. And the section shape of the fin collar is a spline curve passing through five points. That is, with the coordinate value X1 of the middle point of the collar middle part 122 in the vertical direction, the coordinate value X2 of the first end point of the collar middle part 122 in the vertical direction, and the second end point of the collar middle part 122 in the vertical direction The coordinate value X3 in the vertical direction is used as the three control points of the spline curve, and the relationship between X2 and X3 is set as: X2=X3=(C1-X1)×N+X1, 0 Figure 7 (b) The optimized shape shown. Table 3 shows changes in shape before and after optimization in Example 3.

[0067] table 3

[0068]

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Abstract

The invention relates to a heat exchanger fin and a fin tubular heat exchanger and belongs to the technical field of heat exchange. The heat exchanger fin comprises: a platy fin main part and an annular fin rolling ring provided with a through hole inside. The fin rolling ring extends towards the direction of the intersection with the fin main part and consists of a rolling ring root, a rolling ring middle part and a rolling ring bent end part. The rolling ring root is connected with the fin main part. The section of the fin rolling ring is shaped as a spline curve, a control point of the spline curve is an intermediate point of the rolling ring middle part, and the spline curve passes through the intermediate point of the rolling ring middle part, a first end point of the rolling ring middle part, a second end point of the rolling ring middle part, a specified point of the rolling ring bent end part and a specified point of the rolling ring root. As the section of the fin rolling ring is shaped as the spline curve, the clearance between the fin rolling ring and the outer surface of a heat transfer pipe can be the minimum, thus improving the heat transfer efficiency between the fin rolling ring and the outer surface of the heat transfer pipe.

Description

technical field [0001] The invention relates to a heat exchanger and its fins in the technical field of air conditioning, in particular to a heat exchanger fin and a fin-tube heat exchanger. Background technique [0002] Among heat exchangers suitable for condensers or evaporators of air conditioners, there is a finned tube heat exchanger. like Figure 12 As shown, the existing fin-tube heat exchanger adopts fins 12' with an L-shaped cross-section, and the cross-section of the fin collar (fin collar) is designed as a straight line. The design envisages that after the collar of the fin 12' and the outer surface of the heat transfer tube 2' undergo the expansion bonding process, the straight part of the collar of the L-shaped fin 12' is in contact with the outer surface of the heat transfer tube 2' The parts fit together perfectly. However, after the collar is formed by expansion joint, due to the elastic-plastic coordination relationship between the fin-heat transfer tube a...

Claims

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Application Information

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IPC IPC(8): F28F1/32F25B39/00
Inventor 唐鼎彭颖红李大永高桥孝幸芦田圭史
Owner SHANGHAI JIAO TONG UNIV
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