JPS6017993B2 - Heat transfer body with metal fiber layer evaporation heat transfer surface - Google Patents

Description

[Detailed Description of the Invention] This invention is used to improve performance in terms of evaporative heat transfer, which is one of the essential technologies in ocean thermal power generation, scarlet heat power generation for energy saving, or heat utilization. The present invention relates to a heat transfer body (hereinafter simply referred to as a heat transfer body) having a metal fiber layer evaporation heat transfer surface.

In the past, many attempts have been made to improve the performance of the evaporative heat transfer surface, but one of the representative ones is to form a porous layer by attaching metal particles to the evaporative heat transfer surface. Ta. Those formed of metal particles have drawbacks such as lack of uniformity in performance due to particle distribution and thermal processes. This invention was made in order to eliminate the above-mentioned drawbacks, and it is possible to sufficiently control the uniform fineness, layer thickness, pressure, etc., and to achieve extremely uniform air bubbles that cannot be controlled with the conventional metal particle method. The present invention provides a heat transfer body in which a method for forming a core cavity can be selected in accordance with the physical properties of a working fluid.

This invention will be explained below. FIG. 1 is a configuration diagram of a heat transfer body showing an embodiment of the present invention.

That is, it has a structure in which a metal fiber shoulder 2 such as stainless steel fiber is attached onto a heat transfer substrate 1 made of stainless steel, aluminum alloy, etc. by pressure welding or mechanical compression at high temperature. By molding this, a porous layer can be formed on the outer surface or inner surface of the tube. FIG. 2 is a configuration diagram of a heat transfer body showing another embodiment of the present invention. By forming a multilayer (usually two) metal fiber layer 3 of metal fiber linear layers of different weaves, It is possible to create a cavity with a large inside and a small entrance. Next, an example of use of the heat transfer body of the present invention will be explained with reference to FIGS. 3 and 4.

Figure 3 is a side sectional view showing part of a multi-tube cylindrical evaporator.
1 is the left and right jacket, Kawama is the left and right jacket 11
The pipe is made of a material with good heat transfer and has a surface treated surface 13 on which the metal fiber layer 2 or multilayer metal fiber layer 3 described in FIGS. 1 and 2 is attached to the outer surface.

14 is the jacket 11 "hot water passing through the pipe 12"
Reference numeral 15 denotes a medium, which is a low-boiling point medium such as Freon (Trade name: DuPont: R2, RI1, RI14, R12, etc.), ammonia (propane, butane, etc.).

In some cases, water may be used. According to this structure, the heat of the hot water 14 is transferred to the medium 151 through the surface treated surface 13 which is an evaporation surface or a boiling heat transfer surface.

FIG. 4 shows an example of a plate type evaporator, FIG. 4a is a perspective view of the main part, and FIG. 4b is a view taken in the direction of arrow A in FIG. 4a. In this example, a flat plate 12' is used in place of the pipe i2 shown in FIG. The method is the same. Although the surface treatment layer 13 is formed on the outer surface of the pipe 12 in the example shown in FIG. 3, it may also be provided on the inner surface. , parallel to opposing, perpendicular, and other arbitrary configurations.Thus, by using the heat transfer body of the present invention in the surface treatment 13, an evaporator with a high performance thermal overcoefficient can be obtained.

As explained above, this invention allows ``a uniform porous surface to be obtained, so that evaporation performance can be made uniform, quality control can be improved, and design accuracy can be increased.

In addition, since a long-lasting evaporation surface is obtained, the device can be made smaller.
Energy can be used at low density. Furthermore, since a cavity of any size can be created by selecting the weave, it is possible to select the optimum size for the physical properties of the working fluid. Further, it has advantages such as being able to promote heat transfer as an internal evaporation tube.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a heat transfer body showing one embodiment of this invention, FIG. 2 is a block diagram of a heat transfer body showing another embodiment of this invention, and FIGS. 3 and 4 are block diagrams of a heat transfer body showing another embodiment of this invention. An example of the use of the heat transfer body is shown, with FIG. 3 being a partial side sectional view of a multi-tube cylindrical evaporator, and FIG. 4 being a perspective view of a plate evaporator. In the figure, 1 is a heat transfer substrate, 2 is a metal fiber layer, and 3 is a multilayer metal fiber layer. Figure 1 Figure 2 Figure 3 Figure 3

Claims (1)

[Claims] 1. On a heat transfer substrate that performs evaporation and boiling, metal fibers with a large fiber diameter are layered near the substrate, and on top of that, a layer of metal fibers with a smaller diameter is formed. A heat transfer body having a metal fiber layer evaporation heat transfer surface, characterized in that metal fiber layers of different types are used in a composite manner.