JPH03290568A - Heat transfer device - Google Patents

Abstract

PURPOSE:To improve the extent of heat transfer performance by forming an evaporator, a condensing part existing in a heat transferred part, a hot water pipe, a working fluid stored in a gap with an inner wall of the evaporator and a nuclear boiling accelerating means being set up on an outer circumference of the hot water pipe, respectively. CONSTITUTION:When hot water is passed through the inner part of a hot water pipe 4, heat is transferred to the wall of this pipe 4 and it is also transmitted to a boiling accelerating means 10 installed as surrounding the pipe 4. Next, a working fluid 5 is heated by each heat transfer out of the wall of the pipe 4 and out of the accelerating means 10, and thereby snow or the like lain in and around a condensing part 2 is melted. With this constitution, a nuclear boiling of the working fluid is accelerated, and a capacity of heat conveyance is taken large enough, thus the extent of heat transfer performance is improvable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat transfer device used for melting snow and preventing freezing of roofs, roads, etc. in cold regions, for example.

(Prior art) As a conventional device of this kind, for example, Japanese Patent Publication No. 5'J, 436
There is one disclosed in Japanese Patent No. 20, and its outline is shown in FIGS. 6 to 8. In each of these figures, (1> is an evaporation section, and (2) is a plurality of condensation sections that communicate with the inside of this evaporation section (1) and extend above the heat transfer area such as the roof (3). , a plurality of condensing sections (2) are arranged at intervals along the longitudinal direction of the evaporating section (1), and are located above the evaporating section (1). A hot water pipe (5) extends through the longitudinal direction and is arranged concentrically with the pipe center of the evaporator (1), through which hot water flows. A working fluid such as water or ammonia is stored in the gap (6), and (7) is a working fluid (5).
) is heated by the calorific value of the hot water flowing in the hot water pipe (4) and the steam generated is flowing, (8) is the steam space above the working fluid (5) in the gap (6), and (9) is the steam space above the roof ( 3), and the evaporation section (1) is arranged in this gutter (9).

Next, the operation will be explained. When hot water is passed through the hot water pipe (4), the working fluid (5) in the gap (6) between the inner wall of the evaporator (1) and the outer wall of the hot water pipe (4) is heated.

At this time, when the amount of heat added to the working fluid (5) from the hot water pipe (4) increases, steam (7) is generated from the outer wall of the hot water pipe (4), and the inside of the evaporator (1) is in a boiling state. becomes.

The generated steam (7) flows into the working fluid (
5) through the vapor space (8) to the condensing section (2).
). That is, by vaporizing the working fluid (5),
The heat of the hot water is taken away as latent heat of vaporization. The vapor of the working fluid (5) that has moved to the condensing part (2) is cooled by the snow and snow and ice that has accumulated near the condensing part (2), that is, the roof (3), and is crushed into M fine pieces, and the latent heat of condensation is transferred to the snow. or released into snow and ice. The liquefied working fluid (5) travels along the inner wall surface of the condensing section (2) and reaches the gap (6) between the inner wall of the evaporating section (1) and the outer wall of the hot water pipe (4).
). By naturally repeating the above operations, the heat of the hot water is transferred to the condensing section (2), and the snow and ice accumulated near the condensing section (2) are melted.

[Problem to be solved by the invention]

However, in the conventional device described above, there is a limit to the area around the outer periphery of the hot water pipe (4) that acts as a heat transfer surface, so naturally the heat transport capacity cannot be increased. Therefore, the heat transfer performance was low.

The purpose of the present invention was made to solve the above-mentioned problems, and it is an object of the present invention to obtain a heat transfer device having a large heat transport capacity and high heat transfer performance.

[Means for Solving the Problems] A heat transfer device according to the present invention is provided with a nucleate boiling accelerator or a nucleate boiling groove on the outer periphery of a hot water pipe.

[Effect]

In the heat transfer device according to the present invention, nucleate boiling of the working fluid is promoted by the nucleate boiling promoting means or the nucleate boiling groove-like body disposed around the outer periphery of the hot water pipe, and the heat transport capacity is increased.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In each of these figures, (1), (2), (
4) and (5) are similar to the configuration of the conventional device described above.

(10) is each boiling promoting means arranged around the hot water pipe (4), and the figure shows, as an example, a wire mesh placed around the hot water pipe (4). A case is shown in which the nucleate boiling accelerating means (10) is constructed by wrapping it around (4).

Next, the operation will be explained. When hot water is passed through the hot water pipe (4), the amount of heat in the hot water causes the hot water pipe (4) to
heat is transferred to the pipe wall. When the heat is transferred to the pipe wall of the hot water pipe (4), the nucleate boiling promoting means (
10>. The working fluid (5) is heated by heat transfer from the pipe walls of these hot water pipes (4) and heat transfer from the nucleate boiling promoting means (10). In this way, in addition to the heat transfer from the pipe wall of the conventional hot water pipe (4), the heat transfer from the nucleate boiling promoting means (IO), that is, the nucleate boiling promoting means (IO)
As a result, the nucleate boiling of the working fluid (5) can be further promoted, and the heat transport capacity can be increased. Therefore, the heat transfer performance is high.

As a result, it is possible to efficiently and effectively melt snow and snow and ice accumulated in the vicinity of the condensing section (2).

In the above embodiment, the nucleate boiling promoting means (10) was constructed by wrapping a wire mesh around the outer circumference of the hot water pipe (4), but as shown in FIG. The nucleate boiling promoting means (10) may be configured by attaching a porous member to the outer periphery, and the same effects as in the above embodiments can be obtained.

In addition, as shown in FIGS. 3 and 4, a nucleate boiling groove (11) consisting of a plurality of long grooves (lla) formed in the longitudinal direction of the outer circumferential wall of the hot water pipe (4) is configured to operate the hot water pipe (4). Fluid (5
) may be made to increase the nucleate boiling.

In addition, as shown in FIG. 5, a nucleate boiling groove-like body (11) consisting of a plurality of circumferential grooves (11b') formed in the circumferential direction of the outer peripheral wall of the hot water pipe (4) is configured to operate the hot water pipe (4). Nucleate boiling of the fluid (5) may be increased.

Although not shown, a sintered metal body may be provided on the outer peripheral surface of the hot water pipe (4) to increase nucleate boiling of the working fluid (5).

In addition, although the above embodiment describes the case where it is applied to snow melting on roofs, it goes without saying that this invention can also be applied to snow melting, anti-icing, and icicle prevention on building rooftops, parking lots, elevated bridges, bridge surfaces, roads, etc. This means that the same effect as in the above embodiment is achieved.

〔Effect of the invention〕

As explained above, this invention promotes nucleate boiling of a working fluid by means of a nucleate boiling promoting means or a nucleate boiling groove disposed on the outer periphery of a hot water pipe, thereby providing a large heat transport capacity and extremely high heat transfer performance. A heat transfer device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing a heat transfer device according to an embodiment of the present invention, FIGS. 2 and 3 are sectional views of main parts of a heat transfer device according to another embodiment of the invention, and FIG. The figure is a sectional view taken along the line IV-IV in FIG. 3, and FIG.
Figure 6 is a perspective view showing a conventional heat transfer device, and Figure 7 is a perspective view of a conventional heat transfer device.
1 and 8 are cross-sectional views taken along the line ■--■ in FIG. 6, respectively. In the figure, (1) is the evaporation section, (2) is the condensation section, and (4)
(5) is a working fluid, (10) is a nucleate boiling promoting means, and (11) is a nucleate boiling groove. Note that the same reference numerals in the figures are the same. Figure 1 shows the corresponding part.

Claims (3)

[Claims] (1) An evaporation section, a condensation section that is provided in communication with the inside of the evaporation section and extends to the heat transfer target section, and a hot water that is provided to penetrate the evaporation section in the longitudinal direction and that hot water flows inside the evaporation section. A heat transfer characterized by comprising a pipe, a working fluid stored in a gap between an outer wall of the hot water pipe and an inner wall of the evaporation section, and a nucleate boiling promoting means disposed around the outer periphery of the hot water pipe. Device. (2) an evaporation section, a condensation section that is provided in communication with the inside of the evaporation section and extends to the heat transfer target section, and a hot water that is provided to penetrate through the evaporation section in the longitudinal direction and that hot water flows inside the evaporation section; A heat transfer device comprising: a pipe; a working fluid stored in a gap between an outer wall of the hot water pipe and an inner wall of the evaporator; and a wire mesh surrounding the hot water pipe. (3) an evaporation section, a condensation section that is provided in communication with the inside of the evaporation section and extends to the heat transfer target section, and a hot water that is provided to penetrate through the evaporation section in the longitudinal direction and that hot water flows inside the evaporation section; A heat sink characterized by comprising a pipe, a working fluid stored in a gap between an outer wall of the hot water pipe and an inner wall of the evaporation section, and a nucleate boiling groove formed on the outer peripheral surface of the hot water pipe. transmission device.