JPH0437341B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to solar heat collectors, particularly those of the heat pipe type.

BACKGROUND OF THE INVENTION In recent years, heat pipe type solar collectors having a header type configuration are known. In other words, one end of a plurality of heat collecting pipes arranged in parallel, either in heat conductive contact with a heat collecting plate or inserted into a heat insulating glass pipe, is placed perpendicularly to one end of the heat collecting pipes. A single heat pipe connected in a continuous manner to the peripheral wall of the condensing header tube, constructing these into a closed container and sealing a working fluid inside, so that the heat collecting tube operates as an evaporating section and the header tube as a condensing section. It is known that the header tube is constructed such that a heat medium circuit is provided inside or outside the header tube in a heat transfer contact state to form a heat exchange section, and solar thermal energy is transmitted from the heat collecting section to the heat medium. There is.

Problems to be Solved by the Invention However, in the solar heat collector of the type described above, for example, as shown in FIG. When the condensing header pipe 33 with a circular cross section is inserted centripetally into the circumferential wall of the condensing header pipe 33 for communication and connection, the liquid is placed in the lower part of the header pipe 33 with the heat collector installed on the sloped roof surface. A reservoir 34 is formed, in which a portion of the working fluid W remains, and it no longer functions as a heat transport medium, resulting in a disadvantage that the heat transport efficiency of the heat pipe is reduced accordingly.

Therefore, in order to avoid such drawbacks, in the conventional solar heat collector of this type, the upper end of the heat collecting pipe 21 having the heat collecting plate 20 is bent upward, as shown in FIGS. 2 and 3. However, the header pipe 23 connected to this is arranged at a higher level than the heat collecting pipe 21 in order to encourage the working fluid condensed and condensed in the header pipe 23 to flow back to the heat collecting pipe 21. ing. However, for this reason,
When looking at the heat collector as a whole, the heat medium distribution pipe 22
Since the part where the condensing header pipe 23 is located protrudes upward, the collector body B
The upper part of the bulge bulges upward,
The problem was that the overall size became larger and the appearance became unsightly. Moreover, even when the condensing header pipe 23 is arranged at a high position as described above, depending on the slope of the roof where the heat collector is arranged, there is a tendency for a small amount of liquid to accumulate in the lower part of the header pipe. There was a problem that could not be completely eliminated.

This invention aims to solve the above-mentioned problems.

Means for Solving the Problems For the above-mentioned purpose, this invention has one end of a plurality of heat collecting tubes arranged in parallel connected to the peripheral wall of a condensing header pipe arranged orthogonally to the heat collecting pipes, A heat pipe type solar heat collector in which a working fluid is sealed inside to constitute a heat pipe in which the heat collecting pipe serves as an evaporating part and the header pipe serves as a condensing part, and a heat medium flow pipe is assembled to the header pipe. , a water collection guide part having a funnel-shaped cross section with a part of the peripheral wall being a facing inclined wall is formed at least at the heat collection pipe connection part of the condensation header pipe, and the heat collection pipe is connected to the tip of the water collection guide part. This article focuses on a heat pipe type solar collector that is characterized by

Embodiment The structure of the present invention will be explained below based on the embodiment shown in FIGS. 4 to 6.

FIG. 4 shows the entire solar heat collector A according to the present invention, where 1 indicates a heat collecting section and 2 indicates a heat exchange section.

The heat collecting section 1 has a heat insulating material 4 laid at the bottom inside a heat collecting main body 3 which is framed in a rectangular shape using extruded aluminum, etc., and a heat collecting plate 5 covering almost the entire surface on the upper surface side of the heat insulating material 4. At the same time, a plurality of heat collecting tubes 6 are attached in parallel to the lower surface of the heat collecting plate 5 in heat transfer contact with the heat collecting plate. The lower end of each heat collecting pipe 6 is orthogonally connected to a common communication pipe 7, and the upper end penetrates through the main body 3 and protrudes to the outside thereof, facing into the heat exchange section 2. It is considered a thing. Note 8
is a transparent body such as transparent glass disposed to cover the upper surface of the heat collecting section 1 .

The heat exchange section 2 is provided adjacent to the upper end of the heat collecting section 1, and includes a header 10 disposed close to and parallel to the upper horizontal frame member of the main body 3, and a header 10 on the outside thereof. It has a header cover 14 covered with a heat insulating material 13 (see FIG. 2) such as glass wool.

As shown in detail in FIGS. 5 and 6, the header 10 is made of a double tube made of a corrosion-resistant metal such as copper, and the inner tube portion is a straight tube through which a heat medium such as water flows. The outer tube is a condensing header tube 12 constituting a heat pipe condensing section. That is, both ends of the heat medium flow pipe 11 protrude from the condensing header pipe 12 so that it can be connected to the heat medium circulation circuit, and both ends of the condensing header pipe 12 are drawn and connected to the heat medium flow pipe 11. The heat collecting tube 6 and the lower communication tube 7, which are hermetically joined to the circumferential surface of the heat pipe and whose tube ends are connected to the circumferential wall of the heat collecting tube 6 and the lower communicating tube 7, constitute a sealed vacuum vessel, and a working fluid is sealed inside, so that the heat pipe is integrated as a whole. It is said to have consisted of Therefore, the heat collecting tube 6 functions as an evaporation section of a heat pipe.

By the way, as shown in FIG. 6, the condensing header pipe 12 has a part of its circumferential wall formed into opposing inclined walls 12a, 12a, at least in the portion where the heat collecting pipe 6 is connected in the length direction. In particular, a water collection guide portion 15 having a funnel-shaped cross section is formed. In other words, the condensing header pipe 1
2 is formed so that its overall cross-sectional shape is approximately water drop-shaped. The water collection guide portion 15 is oriented toward the heat collection portion 1, and a connection hole 1 is formed at the tip thereof by burring or the like.
One end of the heat collecting pipe 6 is externally fitted into the heat collecting pipe 6 and joined by welding or the like. Therefore, the working fluid that condenses and condenses in the condensation header pipe 12 is guided by the funnel-shaped water collection guide part 15 and flows down into the heat collection pipe 6 reliably, regardless of the change in the installation slope of the heat collector A. What is done and what is done. Note that 17 in the figure is a large number of disc-shaped or spiral-shaped fins attached to the heat medium flow pipe 11.

In the solar heat collector A described above, the heat collecting tube 6 is heated via the heat collecting plate 5 by sunlight transmitted through the transparent body 8, and the working fluid sealed therein is caused to evaporate. This evaporated high-temperature steam rapidly moves from the heat collecting pipe 6 into the condensing header pipe 12 of the header 10 above, exchanges heat with the heat medium such as water flowing in the heat medium distribution pipe 11, and converts the heat medium. Heat. The working fluid condensed in the condensing header pipe 12 by this heat exchange flows down into the heat collecting pipe 6 again solely by the action of gravity, and is transferred into each heat collecting pipe 6 by the communicating pipe 7 connected to the lower end of the working fluid. By repeating the cycle of heating and evaporation again while maintaining the liquid level at an average level, solar heat energy is continuously transmitted to the heat medium in the heat medium flow pipe 11.

Therefore, by connecting both ends of the heat medium distribution pipe 11 to the heat medium circulation circuit surrounding the heat storage tank, the solar heat collector A as described above can be used for either natural circulation type or forced circulation type solar hot water. It can also be applied to vessels.

Effects of the Invention The present invention provides a heat pipe type solar heat collector as described above, in which a water collection guide having a funnel-shaped cross section with a part of the peripheral wall being an opposing inclined wall is provided at least at the connection part of the heat collection pipe of the upper condensing header pipe. Since the heat collecting pipe is connected to the tip of the water collecting guide part, there is no risk of liquid pooling in the condensing header pipe, and the heat transport efficiency of the heat pipe is always maintained at a good level. Can be retained. In particular, this effect of preventing liquid pooling can be maintained even if the installation slope of the heat collector changes somewhat, so it is possible to expand the permissible range of the roof slope in which the heat collector can be installed, increasing versatility. Furthermore, since it is not necessary to arrange the condensing header pipe at a higher position than the level of the heat collecting pipe, it is possible to downsize the condensing section or the heat exchange section. The whole can be manufactured as a compact flat plate type, and the appearance can also be made good.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the header section to explain the state in which liquid pools occur in the condensing header pipe, Fig. 2 is a partial schematic perspective view showing an example of a conventional solar heat collector, and Fig. 3 is a cross-sectional view of the header section to explain the state in which liquid accumulates in the condensing header pipe. The sectional view of the part indicated by the - line in the figure, and Figures 4 to 6 show embodiments of the present invention. Figure 4 is a perspective view showing the entire solar heat collector with a part cut away, and Figure The figure is a cross-sectional view of the header portion, and FIG. 6 is a cross-sectional view taken along the line shown in FIG. 5. DESCRIPTION OF SYMBOLS 1... Heat collection part, 2... Heat exchange part, 6... Heat collection pipe, 10... Header, 11... Heat medium distribution pipe,
12...Condensation header pipe, 12a...Slanted wall, 15
...Water collection information department.

Claims (1)

[Claims] 1 One end of a plurality of heat collecting tubes arranged in parallel is connected to the peripheral wall of a condensing header pipe arranged orthogonally to the heat collecting pipes, and a working fluid is sealed inside to connect the heat collecting pipes to an evaporation section. In a heat pipe type solar heat collector in which a heat pipe is constructed by using a header pipe as a condensing part, and a heat medium flow pipe is assembled to the header pipe, at least the heat collecting pipe connection part of the condensing header pipe is provided. A heat pipe type solar heat collector, characterized in that a water collection guide section having a funnel-shaped cross section is formed with a part of the peripheral wall being an opposing inclined wall, and a heat collection pipe is connected to the tip of the water collection guide section. vessel.