RU2267730C2 - Developed heat-exchange surface - Google Patents

Abstract

FIELD: heating engineering.

SUBSTANCE: developed heat-exchange surface can be used in heat exchangers, steam and hot water boilers, and boilers-exhausts. Developed heat-exchange surface has heat-exchange surface and set of hollow rods disposed inside holes of heat-exchange surface. Edges of rods are plugged at the sides from where the heat is supplied. Set of hollow rods can be disposed along both sides of heat exchange surface or only at the side from where the heat is supplied. Heat-exchange surface has cylindrical or flat shape.

EFFECT: improved accrual of heat exchange.

7 cl, 12 dwg

Description

The invention relates to heat engineering and can be used in heat exchangers used in various industries, namely in heat exchangers, in steam and hot water boilers, in waste heat boilers.

Known developed heat exchange surface with fins in the form of small cylinders or spikes [1].

However, this surface does not have a high degree of heat transfer due to design features (monolithic cylinders or spikes, one-sided finning).

Also known is the heat exchange surface with a two-sided arrangement of needles [2].

The disadvantage of this surface is the incomplete use of the design capabilities of this heat transfer surface from the heat removal side.

Closest to the claimed surface is a heat exchange surface [3], which is a pipe with a system of hollow radial rods placed with an angular offset along the length of the pipe, and a hollow cylindrical insert, with one end of the rod fixed in the holes of the pipe wall and the other ends in the holes hollow cylindrical insert.

With a sufficiently high manufacturing complexity, this surface has a low heat transfer rate.

The purpose of the invention is the intensification of heat transfer.

This goal is achieved by the fact that in the developed heat transfer surface containing the heat transfer surface and the system of hollow rods located in the holes of the heat transfer surface, the ends of the rods from the heat supply side are muffled.

In this case, the system of hollow rods can be located on both sides of the heat exchange surface.

In addition, the system of hollow rods can be located only on one side (from the heat removal side) from the heat exchange surface.

In addition, the heat exchange surface can be either cylindrical or flat.

In Fig.1 shows a developed heat transfer surface (RTP), in a perspective view, in Fig.2 - view A in Fig.1, Fig.3 - RTP with a cylindrical heat exchange surface with bilateral hollow rods, while the heat is supplied with concave parties; figure 4 - RTG with a cylindrical heat exchange surface with a bilateral arrangement of hollow rods, while the heat is supplied from the convex side; figure 5 - RTG with a cylindrical heat exchange surface with a one-sided arrangement of hollow rods, while the heat is supplied from the convex side; 6 - RTP with a cylindrical heat exchange surface with a one-sided arrangement of hollow rods, while the heat is supplied from the concave side; in Fig.7 - RTF with a flat surface of heat transfer with a one-sided arrangement of hollow rods, in a perspective view, in Fig.8 is a view a in Fig.7; figure 9 - RTG with a flat heat exchange surface with a bilateral arrangement of hollow rods, in which from the side of the heat removal half of the rods are shortened to the heat exchange surface, in a perspective view; figure 10 is a view of figure 9; 11, 12 - RTG with a cylindrical heat exchange surface with a bilateral arrangement of hollow rods, in which half of the rods are shortened to the heat exchange surface from the heat removal side, while in Fig.11 heat is supplied from the concave side, and in Fig.12 with convex.

The developed heat exchange surface consists of heat exchange surface 1 and a system of hollow rods 2 located in the openings of heat exchange surface 1, the ends of which are muffled on one side.

The surface works as follows.

The heat is supplied from the side of that part of the hollow rods 2, the ends of which are muffled.

The coolant inside the hollow rods 2 is heated intensively due to the large heat exchange surface.

The greatest heat transfer effect is achieved when using a heat transfer fluid from the heat removal side (for example, water, oil, etc.).

As a result of intense heating, the liquid coolant boils, the resulting vapor pushes the column of liquid coolant in the direction of heat dissipation. The steam in the heat removal zone condenses, giving off heat to a less heated coolant.

The pressure inside the rods drops, and the heat carrier from the heat removal side is sucked into the inside of the rods, where the process repeats.

As a result of this, intensive heat removal occurs from the inner walls of the rods and the heat carrier is intensively mixed from the heat removal side.

Presented developed heat transfer surface can be performed in various ways.

For example, the system of hollow rods 2 is performed on two sides relative to the heat exchange surface 1 (Fig. 1, 2, 3, 4), while the heat transfer surface 1 can be flat (Fig. 1, 2) or cylindrical (Fig. 3, 4) .

Another embodiment of the structural solution of the RTP can be an RTP with a system of hollow rods 2 located only on the heat supply side (Figs. 5, 6, 7, 8), while the heat exchange surface can be either cylindrical (Figs. 5, 6), and flat (Fig.7, 8).

One of the types of RTP is a surface with a bilateral arrangement of hollow rods, in which, on the heat removal side, half of the rods 2 are shortened to the heat exchange surface 1 in order to more rationally distribute the heat transfer process over the volume of the heat carrier from the heat removal side (Figs. 9, 10, 11 , 12).

The optimal ratio of the length of the rods 2 to the inner perimeter of the cross section of the rods 2 at the intersection with the heat exchange surface 1, established experimentally, can be written by the expression:

where L ₁ is the length of the rod from the heat supply side;

L ₂ - the length of the rod from the heat dissipation side;

p is the inner perimeter of the cross section of the rod at the intersection with the heat exchange surface 1.

Information sources

1. Handbook of heat engineering. Ed. B.S. Petukhov. M .: Energoatomizdat, 1987, vol. 1, p. 254, fig. 11c.

2. Heat engineering reference. Ed. V.N. Yureneva and P.D. Lebedev. M .: Energy, 1976, Vol. 2, p. 544, Fig. 8-4, b.

3. A.S. USSR No. 1244469, cl. MKI F 28 F 1/40, 1985

Claims (7)

1. Developed heat transfer surface containing a heat transfer surface and a system of hollow rods located in the holes of the heat transfer surface, characterized in that the ends of the rods on the heat supply side are muffled. 2. Developed heat transfer surface according to claim 1, characterized in that the system of hollow rods is located on both sides of the heat transfer surface. 3. Developed heat transfer surface according to claim 1, characterized in that the hollow rod system is located only on the side of the heat supply. 4. Developed heat transfer surface according to any one of claims 1 and 2, characterized in that the heat transfer surface is cylindrical. 5. Developed heat transfer surface according to any one of claims 1 and 2, characterized in that the heat transfer surface is made flat. 6. Developed heat transfer surface according to any one of claims 1 and 3, characterized in that the heat transfer surface is cylindrical. 7. Developed heat transfer surface according to any one of claims 1 and 3, characterized in that the heat transfer surface is made flat.

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