RU1828537C - Heat exchange element - Google Patents

Abstract

Use in heat exchangers. SUMMARY OF THE INVENTION: the heat-exchange element has the form of a flat pipe, on the outer large sides of which there are transverse arcuate ribs, the bending radius of which is R (1.5-1.7) N, and the upper surface of the ribs is made in the form of a wavelength of 1.5 -2.0 and an amplitude of 0.5-0.7 of the height of the ribs, while the transverse ribs can be located at an angle of 45-80 degrees to the longitudinal axis of the pipe, to increase the intensity of heat transfer. 1 C.p. f-ls, 2 ill.

Description

The invention relates to heat exchanging devices and can be used in power and transport engineering.

In the heat-exchange element in the form of a flat tube with transverse arcuate ribs made on the outer large sides, in order to intensify heat transfer, the radius of bending of the ribs is equal to R (1.5-1.7) N, and the upper surface of the ribs is made in the form of a wavelength A (1 , 5-2.0) N and amplitude h (0.5-0.7) N, where H is the height of the ribs, while the transverse ribs c are located at an angle of 45-80 ° to the longitudinal axis of the pipe.

Figure 1 shows a general view of a tell-exchange element; figure 2 is the same top view.

The heat exchange element consists of a flat pipe 1, on the outer large sides of which there are transverse ribs 2 of height H and radius R (1.5-1.7) N. The upper surface of the ribs 3 has the form of a wavelength A (1.5-2.0 ) H and amplitude h (0.5-0.7) H. Cross ribs 2 (figure 2)

located at an angle of 45-80 ° to the longitudinal axis of the pipe.

The heat exchange element operates as follows.

The coolant passes through the longitudinal channels of the flat pipe 1. Air flow moving perpendicular to the longitudinal axis of the pipe 1 passes between the transverse ribs 2.

The location of the transverse ribs at an angle to the longitudinal axis of the pipe and the implementation of the arched ribs contributes to the movement of the air flow in a spiral, which enhances heat transfer between the air and the heat exchange element. Increases turbulization of the air flow and the undulating surface of the ribs. The bending radius of the ribs, as well as the length and amplitude of the upper wave surface of the ribs are selected experimentally, based on the maximum intensity of heat transfer between the air flow and the heat exchange element.

The proposed device of the heat exchange element allows due to the intensification (/

WITH

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with

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with

of heat transfer due to turbulence in the air flow, increase the efficiency of the heat exchange element by 20-25%.

Claims (2)

1. The heat exchange element in the form of a flat pipe with transverse ribs made on its large walls having lateral ends of the arcuate profile, about t0 characterized in that, in order to intensify the heat transfer process, the radius of curvature of the profile of the side ends is 1.5-1.7 of the height of the ribs, and the edges of the ribs from the side of the larger pipe wall have a wavy shape with a wavelength of 1.5-2.0 heights ribs and an amplitude of 0.5- 0.7 height of the ribs. 2. An element according to claim 1. characterized in that the ribs are located at an angle of 45-80 ° to the longitudinal axis of the pipe. Editor T. Ivanova Compiled by O. Akimova Tehred M. Morgenthal FIG. 2 Proofreader N. Milyukova