JPS6315739Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a solar heat collector for a system that uses, for example, a heat pump to absorb solar heat and outside air heat and utilize it for hot water supply and space heating.

Figures 1 to 3 are structural diagrams showing a conventional solar heat collector. In the figure, 1 is a heat collecting plate made of a thin aluminum plate formed into an L shape, and the sunlight absorption surface 2 is treated with an absorption film. and an outside air heat absorption surface 3 that absorbs outside air heat. 4 is a plurality of burring holes drilled in this outside air heat absorption surface 3; 5;
A heat collecting tube is inserted into a burring hole 4 of a plurality of stacked heat collecting plates 1 and expanded and joined together, and 6 is a U-bend connecting the heat collecting tubes 5 in series. Note that the mounting feet for attaching the solar heat collector to the frame are omitted.

A conventional solar heat collector is configured as described above. For example, when there is sunlight during the day, sunlight hits the sunlight absorption surface 2 of the heat collecting plate 1 and is absorbed there, increasing the temperature of the heat collecting plate 1. On the other hand, when a liquid refrigerant such as freon is fed into the heat collecting pipe 5 by a heat pump device (not shown), the refrigerant is transferred from the heat collecting plate 1 to the burring holes 4.
It receives heat through the heat pump, heats it up, boils and evaporates, becomes a gas, and returns to the heat pump device. When this gas condenses and becomes a liquid, the heat released is used for space heating or hot water supply. Note that when the temperature of the heat collecting plate 1 receiving sunlight is higher than the outside air temperature, some of the solar heat absorbed by the heat collecting plate 1 escapes to the outside air by convection and radiation. However, the heat escaping from the outside air heat absorption surface 3 by convection can be dissipated between the heat collecting plates 1 as long as the wind is not strong if the solar heat collector is installed with the right or left side tilted higher as shown in Figure 1. Mounded heat loss can be suppressed. Further, in order to suppress heat loss due to radiation, it is preferable to leave the surface facing the lower side of the heat collecting plate 1 in a state of having a low emissivity, which is obtained by applying corrosion-resistant treatment to the aluminum material. In addition, when the heat pump device is controlled so that the evaporation temperature of the refrigerant in the heat collecting pipe 5 is lower than the outside temperature, most of the solar heat absorbed by the heat collecting plate 1 is used to evaporate the refrigerant, and The heat from the outside air is absorbed by the sunlight absorption surface 2 and the outside air heat absorption surface 3.
is used to evaporate the refrigerant.
If the solar collector is used regularly in this way, the natural convection of air on the lower surface of the heat collecting plate 1 will be promoted by installing the solar collector with the upper or lower side tilted higher as shown in Figure 1. The amount of heat exchange increases.

Now, since the solar heat collector is installed outdoors on a roof or the like, the load due to wind pressure during a typhoon or the load due to snow accumulation acts on the sunlight absorbing surface 2 of the heat collecting plate 1. However, as mentioned above, since the sunlight absorption surface 2 is a cantilever beam, it deforms greatly when a load is applied to the surface.
The drawback was that it could no longer function as a collector.

The purpose of this idea is to create a solar collector with high rigidity against wind and snow accumulation, and a surface that easily absorbs outside heat.

FIG. 4 is a cross-sectional view showing one embodiment of this invention, and 5 and 6, including those not shown, are completely the same as those of the above-mentioned conventional example. 1 is a heat collecting plate formed by rotating a thin aluminum plate by 90 degrees in a U-shape, and has a solar absorption surface 2 whose upper surface is treated with an absorption film, and both sides of this solar absorption surface 2. It is provided with a pair of outside air heat absorbing surfaces 3 bent downward from the top. Reference numeral 4 denotes a plurality of burring holes formed in each of the external heat absorbing surfaces, into which the heat collecting pipes 5 are inserted and expanded.

In the solar heat collector configured as described above, solar heat is collected by the sunlight absorbing surface 2, and outside air heat is collected by the sunlight absorbing surface 2 and a pair of outside air heat absorbing surfaces 3, and is transmitted to the heat collecting pipe 5 through a pair of burring holes 4. It will be done. Further, when a downward or upward load acts on the sunlight absorption surface 2, the force is transmitted to the heat collecting tube 5 through the pair of burring holes 4, and supports the sunlight absorption surface 2 from both ends to suppress its deformation.

FIG. 5 shows a second embodiment of the heat collecting plate 1, in which burring holes 4a are bored in one of the outside air heat absorbing surfaces 3.
is slightly larger than the outer diameter of the heat collecting tube 5. According to FIG. 5, although the heat transfer from one of the outside air heat absorption surfaces 3 to the heat collecting tubes 5 deteriorates, the assembly work efficiency is improved when inserting the heat collecting tubes 5 of the stacked heat collecting plates 1. .

FIG. 6 shows a third embodiment of the heat collecting plate 1, in which one of the outside air heat absorbing surfaces 3 is provided with a through hole 6 that is slightly larger than the outer diameter of the heat collecting tube 5. This sixth
According to the figure, in addition to the assembly workability, the moldability of the heat collecting plate 1 is improved.

FIG. 7 shows a fourth embodiment of the heat collecting plate 1, in which one of the outside air heat absorbing surfaces 3 has a length that does not reach the heat collecting pipe 5, or is almost as long as the outside air heat absorbing surface 3. It is joined to the heat absorbing surface 3 by adhesive or other means. According to this figure 7,
The material used for the heat collecting plate 1 can be reduced.

FIG. 8 shows a fifth embodiment of the heat collecting plate 1, in which one outside air absorbing surface 3 is provided with burring holes 4 and a stepped portion 7, and the other outside air heat absorbing surface 3 is provided with this stepped portion 7. The length is as long as you want to ride.

According to FIG. 8, the strength against loads from above is improved. Furthermore, if both absorbing surfaces 3 are bonded together, the strength against loads from below can be maintained.

In the above embodiment, the solar heat absorbing surface 2 was made into a simple plate shape, but if the evaporation temperature of the refrigerant is often operated at a lower temperature than the outside temperature, the solar heat absorbing surface 2 may be used in order to improve the air circulation around the heat collecting plate 1. It is preferable to provide ventilation holes in the absorption surface 2. Furthermore, in order to increase the strength of the solar heat absorbing surface 2 and the outside heat absorbing surface 3, ribs may be made to protrude from key points on each surface by press molding.

Now, in the above embodiment, the heat collecting pipes 5 of each heat collecting plate 1 are connected in series, but if necessary, it is preferable to connect them in parallel or in a combination of series and parallel.

By the way, in the above description, the heat medium flowing in the heat collecting pipe 5 was explained as a gas-liquid two-phase flow refrigerant, but it goes without saying that it can also be used as a single-phase flow heat medium. Moreover, this collector can also be used as a radiator when there is no sunlight, such as at night.

As explained above, this idea has a simple structure in which a pair of outside heat absorption surfaces are provided on the heat collection plate, and the load from the outside air heat absorption surfaces is supported by the heat collection tube, which has the effect of improving its strength against wind and snow accumulation. There is.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a conventional solar collector, Fig. 2 is a side view of Fig. 1, Fig. 3 is an enlarged sectional view taken along the - line in Fig. 1, and Fig. 4 shows an embodiment of this invention. 5 to 8 are cross-sectional views of heat collecting plates showing different embodiments of this invention. In the figure, 1 is a heat collecting plate, 2 is a solar absorption surface, and 3
4 is an outside air heat absorption surface, 4 is a burring hole, 5 is a heat collecting pipe, 6 is a through hole, and 7 is a stepped portion. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A plurality of heat collecting plates each having a sunlight absorbing surface facing toward the sun and a pair of outside heat absorbing surfaces bent downward from both sides of this surface. , and a heat collecting tube that is thermally coupled to these heat collecting plates and supports the load from the outside air heat absorbing surface. (2) The solar heat collector according to claim 1 of the utility model registration, characterized in that burring holes are provided in each of the pair of outside air heat absorbing surfaces, and heat collecting tubes are fixed to these burring holes. (3) The scope of the utility model registration claim, characterized in that one outside air heat absorbing surface is provided with a burring hole of a size that is fixed to the heat collecting pipe, and the other outside air heat absorbing surface is provided with a larger burring hole. The solar collector according to item 1. (4) A request for registration of a utility model characterized in that one outside air heat absorbing surface is provided with a burring hole of a size that is fixed to the heat collecting pipe, and the other outside air heat absorbing surface is provided with a through hole through which the heat collecting pipe passes through. The solar collector according to item 1 of the scope of the invention. (5) One outside air heat absorbing surface is provided with burring holes of a size that is fixed to the heat collecting pipe, and the other outside air heat absorbing surface is shaped like a flat plate and is bonded to the adjacent outside air heat absorbing surface having burring holes. A solar collector according to claim 1 of the utility model registration claim. (6) One outside air heat absorption surface has a burring hole and a stepped portion sized to be fixed to the heat collecting pipe, and the other outside air heat absorption surface has a flat plate shape, and the step portion of the outside air heat absorption surface that has adjacent burring holes is provided. The solar collector according to claim 1, wherein the lower end of the collector is in contact with the solar collector. (7) Claims 1 to 6 for utility model registration, characterized in that ventilation holes are provided on the solar heat absorbing surface
A solar collector according to any of the paragraphs.