JPH1026485A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the outlet port temperature of the main flow of a heat exchanger from becoming uneven owing to through flow generated between the side wall of the heat exchanger and heat transfer tubes nearest to the side wall of the same. SOLUTION: In a heat exchanger, in which the group of heat transfer tubes 3 is arranged orthogonally to the flow direction of main flow 10, heat transfer tubes 4, 6, projected to the main flow side of side wall 2 of the heat exchanger and the opposite side of the main flow, are arranged alternately to preclude the through flow 9 of the main flow, flowing between the side wall 2 and the heat transfer tube 3, nearest to the same side wall.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used for various devices and plants, and more particularly to a heat exchanger suitable for use in a wind tunnel test apparatus requiring high accuracy.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional heat exchanger in which heat transfer tubes are arranged so as to be orthogonal to the main flow direction. In this heat exchanger, the heat transfer tubes 3 are arranged in a staggered manner so as to be orthogonal to the flow direction of the main flow 10, and the outside of the side wall 2 of the heat exchanger is insulated by the heat insulating material 1.

[0003]

In the above-mentioned conventional heat exchanger shown in FIG. 3, a throughflow 9 of the main stream 10 is generated between the side wall 2 and the heat transfer tube 3 closest to the side wall 2. For this reason, as shown in FIG.
When 1 is uniform, the temperature distribution at the outlet of the main flow heat exchanger is, for example, when the main flow side has a high temperature with respect to the heat medium flowing through the heat transfer tubes (ie, when the main flow is cooled by the heat transfer tubes) In the vicinity of 2, sufficient heat exchange (cooling in this case) is not performed by the heat transfer tube 3, and as shown by a solid line 12 in FIG.

An object of the present invention is to provide a heat exchanger that can solve the above problems.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a heat exchanger in which a group of heat transfer tubes are arranged so as to be orthogonal to the flow direction of the main flow. The heat transfer tubes projecting to the side and the side opposite to the mainstream are alternately arranged.

(1) In the present invention, since the heat transfer tube protruding toward the main flow side is provided on the main flow side of the side wall of the heat exchanger, the heat transfer tube allows the heat exchanger side wall and the main flow closest to the side wall to flow in the main flow direction. The flow of the main flow between the heat flow tubes arranged perpendicular to the flow direction is disturbed and the main flow is disturbed, and the heat exchange between the main flow and the heat transfer tubes arranged perpendicular to the flow direction is promoted. .

(2) Further, on the main flow side and the side opposite to the main flow of the side wall of the heat exchanger, heat transfer tubes projecting to the main flow side and the side opposite to the main flow are alternately arranged, respectively, so that the main flow side of the side wall is provided. Heat is exchanged between the main flow and these heat transfer tubes via the boundary layer of the flow formed in the above, and the heat transfer performance is improved.

[0008] By the action of the above (1) and (2),
According to the present invention, the temperature distribution at the outlet of the mainstream heat exchanger can be made uniform.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. In the present embodiment, the configuration described below is added to the heat exchanger shown in FIG. 3, and portions that are not changed in FIG. 1 are denoted by the same reference numerals as in FIG. 1, and description thereof is omitted. I do.

In the present embodiment, the heat transfer tubes 3 projecting toward the main flow side and extending over the entire width of the side walls 2 are provided on the main flow side of the heat exchanger side walls 2 on both sides in the direction along the heat transfer tubes 3 arranged in a staggered manner. A plurality of semicircular heat transfer tubes 4 extending in the axial direction are arranged. The plurality of heat transfer tubes 4 are provided over the entire side wall 2 in the flow direction of the main flow 10.

On the side opposite to the main flow of the side wall 2 of the heat exchanger on both sides in the direction along the heat transfer tubes 3 arranged in a staggered manner, the entire width of the side wall 2 protruding toward the side opposite to the main flow (the side of the heat insulating material 1). Semicircular heat transfer tubes 6 extending in the axial direction of the heat transfer tubes 3
Are arranged over the entire side wall 2 in the flow direction of the main flow 10. The heat transfer tube 6 and the heat transfer tube 4
Are alternately arranged in the flow direction of the main flow 10.

The main stream 1 is provided inside the heat transfer tubes 3, 4, 6.
A heat medium for performing cooling or heating of 0 is supplied. Reference numeral 5 denotes a partial side wall of the side wall 2 in which the end on the mainstream side of the heat transfer tube 6 is sealed so that heat exchange between the mainstream 2 and the heat medium in the heat transfer tube 6 is performed.

In the present embodiment configured as described above, the through flow 9 between the side wall 2 and the heat transfer tube 3 closest to the side wall 2 is blocked by the heat transfer tube 4 over the entire area of the side wall 2, and the main flow 10. A turbulent flow is generated, and heat exchange between the heat transfer tube 3 and the main flow is promoted.

Further, heat exchange is performed between the main flow and the heat transfer tubes 4 and 6 provided alternately on the side wall 2 via a flow boundary layer formed on the main flow side of the side wall 2.

As a result, in the present embodiment, the main flow 10 is efficiently and evenly provided between the side walls 2 and 2.
And heat exchange between the heat transfer tubes 3, 4, and 6. Therefore, as shown by a dotted line 13 in FIG. 4, the temperature distribution at the outlet of the mainstream heat exchanger can be made uniform.

A second embodiment of the present invention will be described with reference to FIG. This embodiment is a first embodiment of the present invention.
In the embodiment, instead of the semicircular heat transfer tubes 4 and 6 provided alternately on the side walls, as shown in FIG.
8 is used.

In this embodiment, the same operation and effect as those in the first embodiment of the present invention can be obtained.

In the first and second embodiments of the present invention, the heat transfer tubes 4, 6 provided on both sides of the side wall 2;
Although semi-circular and rectangular shapes are used as 7 and 8, respectively, other shapes such as arc-shaped, semi-circular, elliptical, and non-rectangular heat transfer tubes are used instead. You can also.

[0019]

According to the present invention, the temperature distribution at the outlet of the mainstream heat exchanger can be made uniform, and particularly, the temperature distribution can be improved. It is useful as a heat exchanger for setting conditions in an environmental wind tunnel test room whose distribution is major.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a heat exchanger according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a heat exchanger according to a second embodiment of the present invention.

FIG. 3 is a partial sectional view of a conventional heat exchanger.

FIG. 4 is a comparison diagram of the mainstream heat exchanger outlet temperature in the conventional heat exchanger and the heat exchanger of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation material 2 Side wall 3 Heat transfer tube 4,6 Semicircular heat transfer tube 5 Partial side wall 7,8 Rectangular heat transfer tube 9 Through flow 10 Main flow 11 Heat exchanger inlet temperature distribution 12 Conventional heat exchanger outlet temperature distribution 13 Present invention Heat exchanger outlet temperature distribution

Claims (1)

[Claims] 1. A heat exchanger in which heat transfer tube groups are arranged so as to be orthogonal to the flow direction of a main flow, and protrude to the main flow side and the main flow side of the side wall of the heat exchanger, respectively, to the main flow side and the main flow side. A heat exchanger characterized by alternately disposing heat transfer tubes.