JPH11124977A - Solar-battery-equipped roof plate and photovoltaic power generating roof serving to melt snow - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar-battery-equipped roof plate and a photovoltaic power generating roof serving also to melt snow, capable of efficiently melting snow and generating power through photovoltaic means, the snow melting being achieved at reduced cost by means of far infrared rays generated from solar batteries. SOLUTION: This roof plate includes solar batteries 6 covering its surface and a heating means 21 for heating the solar batteries, each of the solar batteries 6 having a silicon crystal layer or amorphous silicon layer. The heating means 21 heats the solar batteries 6 to cause far infrared rays to radiate from the silicon crystal layer or amorphous silicon layer to melt snow on a roof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roof panel with solar cells and a solar power generation roof for both snow melting and snow melting.

[0002]

2. Description of the Related Art In recent years, in consideration of snow melting on a roof of a building in a snowy area, a heating resistor which generates heat by energization is attached to the inside or the back of a roof plate, and the snow on the roof is generated by the heat generated by the heating resistor. The technology of melting snow is spreading. The heating resistor is, for example, a sheet or the like containing a resistance wire or a resistance material. Such a heating resistor has a large degree of freedom in shape, and can be easily integrated into a roof plate, and It can be built into a roof simply by installing a board, and high workability can be obtained.

[0003]

However, in the above-mentioned snow melting caused by the heat generated by the heat generating resistor, only the roof plate surface is melted. There is a problem that the snow on the roof becomes a bridge state with the progress of snow melting, and the entire snow cannot be melted efficiently. For this reason, the snow cover above the roof plate cannot melt snow until the bridge collapses and falls on the roof plate, and snow melting cannot be performed efficiently. Another problem is that if the snow in the bridge state suddenly falls on the roof shingle, the roof shingle is easily damaged. In view of the above problem, it is conceivable to increase the power supplied to the heating resistor in order to spread the heat generated by the heating resistor to the entire roof. However, this increases the power consumption and increases the power cost enormously. Problem arises.

[0004] In recent years, photovoltaic power generation using a solar cell installed on a roof has become widespread, and there is an increasing demand for effective use of photovoltaic power generation even in snowy areas. However, in a snow-covered area, solar power generation becomes impossible due to snow on the solar cell in winter or the like when snow is present. In addition, it is general that a solar cell is provided with a gantry mounted on the roof, and it is difficult to melt the snow on the solar cell even if the snow on the roof is melted by the above-described heating resistor. Met. For this reason, in snowy areas,
Installation of solar cells has become difficult to spread.

The present invention has been made in view of the above-mentioned problems, and (1) can efficiently perform both snow melting and photovoltaic power generation; and (2) low cost due to far infrared rays generated from a solar cell. It is an object of the present invention to provide a roof plate with a solar cell and a solar power generation roof that can also melt snow at a low temperature.

[0006]

According to a first aspect of the present invention, there is provided a solar cell provided on a surface thereof, and heating means for heating the solar cell, wherein the solar cell comprises a silicon crystal layer or amorphous silicon. A roof panel with a solar cell, wherein the heating means heats the solar cell, so that far infrared rays are emitted from the silicon crystal layer or the amorphous silicon layer. This is means for solving the above problems.

[0007] A solar cell is generally a semiconductor cell formed by laminating a plurality of semiconductor layers. By the way, the present applicant has found that a silicon crystal layer or an amorphous silicon layer constituting a semiconductor cell generates far-infrared rays by heating. In the roof panel with a solar cell according to the present invention, the snow on the roof is melted by far infrared rays emitted from a silicon crystal layer or an amorphous silicon layer provided in the solar cell, in addition to the heat generated by the heating means. Far-infrared rays melt snow on the roof extensively. Thus, the snow on the roof can be efficiently melted without causing a bridge phenomenon or the like. In addition, efficient melting of snow by the synergistic effect of the heat generated by the heating means and far-infrared rays makes it possible to significantly reduce the cost compared to snow melting only by heating. The upper limit of the heating of the solar cell by the heating means is set within the range of the heat-resistant temperature of a general solar cell. Given that the heat-resistant temperature is generally designed to be around 90 to 100 ° C., a sufficient snow-melting effect can be obtained by the heat generated by the heating means and the far-infrared rays radiated from the solar cell by the generated heat. Also, the ability to melt snow efficiently
Increase the opportunities for solar power generation in snowy areas and contribute to the spread of solar power generation.

The solar cell may be either integral with the roof panel or separate from the roof panel. In the case where the solar cell is separate, post-installation work is also possible. According to the second aspect of the present invention, if the heating means is a heating element extending along the solar cell on the back side of the solar cell, a degree of freedom can be obtained in the configuration of the heating element. Therefore, for example, by using a roof plate in which a heating element is integrated, the workability of the roof can be improved. As the heating element, for example, when a configuration is adopted in which the heating element is a heating resistor that emits far-infrared rays when energized, as described in claim 3, both heat generation from the heating resistor and far-infrared rays are covered by snow. To effectively melt snow. In addition, since the heat generated by the heating resistor and the far infrared rays effectively contribute to the emission of far infrared rays from the solar cell, the far infrared rays acting on the snow cover increase, and the snow melting can be performed more effectively. it can.

The roofing sheet is generally composed of a backing material made of a foam material or the like and having heat insulation and heat resistance, and a metal sheet for a roofing sheet adhered to the backing material. In the case of a plate, a solar cell is attached to the front side of a metal plate for a roof plate. If the heating element can be formed into a thin shape, it is easy to arrange it between the metal plate for the roof sheet and the backing material, and it is costly to integrate the heating element with the roof panel with solar cells. Suitable for workability. In this case, the solar cell and the heating element are opposed to each other via the metal plate for the roof panel, and the heat generated by the heating element can be efficiently applied to the solar cell and snow on the solar cell. Radiation is also made efficiently. Here, if the solar cell is also integrated with the roof panel, the solar cell and the heating element are also mounted on the roof simply by installing the roof panel with the solar cell, and the workability is further improved. As the heating element, various configurations such as a hot water pipe other than a heating resistor that generates heat by energization can be adopted.

[0010] The heating means is not limited to the heating element according to the second aspect, and various configurations can be adopted. For example, if a configuration is adopted in which the heating means is an energizing means for energizing the solar cell as described in claim 4, it is not necessary to attach a heating element to a roof plate or the like, and the workability of the roof is further improved. improves. As mentioned above, solar cells are semiconductors,
When energized, it generates heat due to its own resistance. This allows
The silicon crystal layer or amorphous silicon layer of the solar cell is heated, and far infrared rays are emitted. In recent years, it has also been practical to supply (sell) electric power generated by a solar cell to an existing power supply facility that supplies electric power to a user. Then, as described in claim 5, the power supply facility and the solar cell are connected via a power distribution facility that distributes power supplied from the power supply facility, and the power supply facility of the power generated by the solar cell is connected. And the power supply from the power supply equipment to the solar cell is configured to be switchable by the power distribution equipment. When the power supply equipment supplies power to the solar cell, the power distribution equipment When the configuration functioning as the means is adopted, the solar cell can be heated by supplying electric power supplied from the existing power supply equipment to the solar cell through the power distribution equipment. At this time, a structure in which the silicon crystal layer or the amorphous silicon layer of the solar cell itself is heated by energization to generate far-infrared rays, a semiconductor layer or a heating resistor layer provided in the solar cell in addition to the silicon crystal layer or the amorphous silicon layer Can be adopted to emit far-infrared rays from the silicon crystal layer or the amorphous silicon layer by heating by heating.

[0011] Further, according to a sixth aspect of the present invention, there is provided a metal plate for a roof plate to which the solar cell is attached, and the heating means is provided between the metal plate for the roof plate and the solar cell. A configuration that is a thin film heating element can also be adopted. As the heating element, various configurations such as a heating resistor made of a metal thin film that generates heat by energization can be adopted. For example, as described in claim 7, the thin-film heating element may be the solar cell or the solar cell. The adoption of a composition that is a heat-generating paint applied to a metal plate for a roof plate enables the size and weight of the solar cell or the roof plate to be reduced, improves the degree of freedom in shape, facilitates formation, and reduces cost. Is possible. The formation position of the heat-generating paint film on the solar cell is limited to the back side of the solar cell when the heat-generating paint film has light-shielding properties, and on either side when the heat-generating paint film has translucency. Is also good.

According to an eighth aspect of the present invention, the first to seventh aspects are described.
In the snow-melting / solar power generation roof characterized by comprising the roof panel with a solar cell according to any one of the above, both the snow melting and the solar power generation can be efficiently performed by the roof panel with the solar cell. The solar power generation can be effectively used even in snowy areas. It is more preferable that the snow roof combined with photovoltaic power generation has an appropriate water gradient, so that high snow melting efficiency can be obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a snow melting solar power generation roof, which is installed above a building 2. Reference numeral 3 in FIG. 1 denotes a power supply facility, which supplies power generated at a power plant.

Reference numeral 4 denotes a power distribution facility,
Is supplied to the power supply terminal 5 routed into the building 2. Specifically, the power distribution facility 4 includes a power distribution panel 4a that distributes the power supplied from the power supply facility 3 to a plurality of power supply terminals 5, and a DC / AC converter 4b.
The DC / AC converter 4b converts a DC current generated by the solar cell 6 provided on the roof panel 10 with a solar cell constituting the snow melting solar power generation roof 1 into an AC current and supplies the AC current to the distribution board 4a. The power supplied from the DC / AC converter 4b to the distribution board 4a is supplied to the power supply equipment 3 or the power supply terminal 5. The current flowing from the solar cell 6 to the DC / AC converter 4b passes through a connection box 7 connected between the two. The solar power generation roof 1 combined with snow melting is composed of a number of roof panels 10 with solar cells, and the connection box 7 connects between the solar cells 6 provided on each roof panel 10 with solar cells and the power distribution equipment 4. A connection part such as a connector to be connected is stored. Further, the DC / AC converter 4b can be equipped with a so-called inverter function or the like for modulating the power supplied from the solar cell 6 to the power supply equipment 3. 1 in FIG.
d is a power selling power meter that displays the amount of power supplied from the solar cell 6 to the power supply facility 3 via the power distribution facility 4, and 4 e indicates the power amount that is supplied to the power distribution facility 4 from the power supply facility 3. It is a purchased power meter.

FIG. 2 is an enlarged perspective view showing the photovoltaic roof 1 combined with snow melting. In FIG. 2, the roof 1 for snow melting and solar power generation is provided with a waterproof sheet 9 stretched on an inclined base material 8, and a large number of roof panels 10 with solar cells are connected vertically and horizontally on the waterproof sheet 9. Make up. Each roof panel 10 with a solar cell has a rectangular plate shape, and a plurality of solar cells 6 are attached to the surface (the upper surface in FIG. 2).

FIG. 3 is a perspective view showing the roof panel 10 with solar cells. In FIG. 3, a roof panel 10 with a solar cell is provided.
Is a backing material 11 formed of a lightweight resin foam material having heat resistance, a metal roof plate metal plate 12 adhered to an upper surface 11a of the backing material 11, and a roof plate metal plate 12
It comprises a thin plate-shaped solar cell 6 attached thereon, and a heating element 21 (electric heating panel) arranged so as to be sandwiched between the roof metal plate 12 and the backing material 11. The heating element 21 has a panel shape and extends along the roof metal plate 12, that is, along the back surface of the solar cell 6.

As the backing material 11, a resin foam or the like is applied. Polyethylene, polystyrene, vinyl chloride,
Hard foaming agents made of phenol, polyurethane or the like are generally used. The backing material 11 maintains the shape of the metal sheet 12 for the roofing sheet by its own strength and increases the strength of the roofing snow solar power generation roof 1 that has been roofed, and also has heat insulation, heat resistance, sound insulation, waterproofness, and the like. Useful for

The material of the metal plate 12 for the shingle may be a general-purpose metal, such as iron, aluminum, copper, zinc, titanium or a base alloy thereof. Copper, aluminum or a base alloy thereof is preferable in terms of excellent thermal conductivity, but a steel sheet is appropriate in terms of durability, cost, and the like.

The heating element 21 is a roof panel 1 with a solar cell.
0, a waterproof connector 22 that can be pulled out to the outside,
When electricity is supplied through the waterproof connector 22, heat is generated. The heat generated by the heating element 21 acts on the snow on the roof panel 10 with a solar cell to melt the snow,
During snow melting, the solar cell 6 is also heated. The upper limit of the heating of the solar cell 6 by the heat generated by the heating element 21 is about 90 ° C., which is a range that does not affect the performance of the solar cell 6. The waterproof connector 22 is connected to the connection box 7 shown in FIG.
Is connected to the power distribution equipment 4 via the
Is supplied to the heating element 21 via the power distribution equipment 4.

As the heating element 21, various configurations such as a heating panel in which a heating resistance wire such as a nichrome wire is housed in a covering material can be adopted. In the present embodiment, for example, a carbon cloth is used for a glass cloth. Panel made by impregnating and sintering Teflon and Teflon, and carbon black on vinyl acetate copolymer (EVA) containing vinyl acetate (VA) or vinyl acetate (VA) containing vinyl acetate (VA) Electrified panels and the like are used. Each of these electric heating panels emits far-infrared rays having a wavelength of about 8 to 15 μm, and corresponds to the heating resistor according to the third aspect. In addition,
The power supplied to the heating element 21 may be either AC or DC. For example, a configuration in which AC power is supplied via the connection box 7 by a power supply line (not shown) drawn from the power distribution facility 4. Also, various configurations such as a configuration in which power is supplied by the power supply line 5a that does not pass through the connection box 7 can be adopted.

In FIG. 3, reference numeral 10a denotes a water receiver, and 10b denotes a horizontal joint. As shown in FIG. 4, the water receiver 10a and the horizontal joint 10b are overlapped between adjacent roof panels 10 with solar cells. By joining, the roof panel 10 with a solar cell can be joined continuously in the longitudinal direction. At this time, by connecting the waterproof connectors 22 between the adjacent roof panels 10 with solar cells, the heating elements 21 of all the roof panels 10 with solar cells of the snow-melting combined solar power generation roof 1 are connected. Can be electrically connected.

FIG. 5 is an enlarged sectional view showing the vicinity of the solar cell 6. As illustrated in FIG. 5, the solar cell 6 includes a substrate 13 attached on a metal plate 12 for a roof plate, and solar cells 14 stacked on the substrate 13. Further, the upper surface 6a of the solar cell 6 is covered and protected by a transparent surface material 15 such as a fluororesin film, and a transparent adhesive 16 is provided between the surface material 15 and the metal plate 12 for a roof panel. The solar cell 6 is fixed by filling.

FIG. 6 is an enlarged sectional view showing an example of the solar cell 14. In FIG. 6, the solar cell 14 is
A thin film-shaped back surface reflection layer 17 adhered on a substrate 13 and an amorphous silicon layer 1 laminated on the back surface reflection layer 17;
8, a transparent electrode 19 laminated on the amorphous silicon layer 18, and a current collecting electrode 20 mounted on the transparent electrode 19. The substrate 13 is formed from a thin stainless steel plate or the like to a thickness of about 0.1 mm, and forms a pair of electrodes together with the current collecting electrodes 20. Amorphous silicon layer 18
Are the bottom cell 18a and the middle cell 18 from the substrate 13 side.
b and the top cell 18c are sequentially laminated, and have a thickness of about 1 μm.

When the sunlight passing through the surface material 15 and the adhesive 16 enters the amorphous silicon layer 18, the bottom solar cell 14 a receives long-wavelength light of the incident sunlight. However, the middle cell 18b responds to the medium wavelength light, and the top cell 18c responds to the short wavelength light to generate power. The sunlight transmitted through the amorphous silicon layer 18 is upward (upward in FIG. 6) by the back reflection layer 17.
Is reflected and transmitted again through the amorphous silicon layer 18, so that the power generation efficiency of the entire amorphous silicon layer 18 is improved.

In the present embodiment, in normal use without snow, the power generated by the solar cell 6 by solar power is supplied to the power distribution equipment 4.
(See FIG. 1), and the power is supplied to the power supply terminal 5 or the power supply equipment 3 by the distribution board 4a of the power distribution equipment 4. On the other hand, when snowing, the heating element 21 is energized to generate heat, and the snow on the roof panel 10 with solar cells is melted. At this time, the heating element 21
Far infrared rays radiated from the solar cell affect not only the snow cover in contact with the roof panel with solar cells 10 but also the snow cover separated from the roof panel with solar cells 10, so that the snow cover can be melted over a wide range. The heat generated by the heating element 21 is
Is also heated, far infrared rays are radiated from the amorphous silicon layer 18 of the solar cell 6, and snow melting is promoted. Since far-infrared rays act on snow covering a wide area, a bridge phenomenon of the snow covered with the progress of the snow melting is prevented, and the entire snow covered can be efficiently melted. Further, since snow melting is performed by using far-infrared rays from the solar cell 6 in addition to heat generation from the heating elements 21 and far-infrared rays, the cost of snow melting such as electricity bills is significantly reduced as compared with the case where only the heating elements 21 are used. Can be reduced.

In the roof 1 for combined use of snow melting and solar power generation, since solar power generation is possible when snow melting is completed, the efficiency of solar power generation is increased even in a snow-covered area, and the solar power generation can be spread. As described above, with the snow melting solar power generation roof 1, solar power generation can be performed with high efficiency in summer when there is no snowfall, and effective snow melting can be performed and solar power generation can be performed in snowfall in winter and the like. Is possible and there is no waste throughout the year.

The number of stacked amorphous silicon layers of the solar cell employed in the solar cell 6 of the present embodiment may be one, two, four or more layers other than the three-layer structure shown in FIG. It is. Further, the solar cell may employ a silicon crystal layer instead of the amorphous silicon layer. It is also possible to provide a solar cell with a compound semiconductor layer. Depending on the composition of the compound semiconductor layer, the compound semiconductor layer emits far-infrared rays enough to obtain a sufficient snow-melting effect. Can be.
As the composition of the compound semiconductor, GaAs or C
In a ternary system such as dS, CuInSe ₂ or the like is employed. As the silicon crystal layer, any of silicon single crystal and silicon polycrystal can be adopted.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same components as those in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof will be simplified.
In FIG. 7, reference numeral 30 denotes a power distribution facility, which includes a power distribution panel 4a and a DC / AC converter 31. DC / AC converter 31
The function is changed by operating the changeover switch 32 as well as converting the direct current generated by the solar cell 6 provided in the roof panel 33 with the solar cell into the alternating current and supplying the alternating current to the switchboard 4a. The AC current supplied from the facility 3 is converted into a DC current and supplied to the solar cell 6. When the changeover switch 32 is operated again, the function is switched again, and power is supplied from the solar cell 6 to the distribution board 4a.

FIG. 8 shows a roof panel 33 with solar cells used in this embodiment. As shown in FIG. 8, in the roof panel 33 with solar cells, the metal plate 12 for the roof panel is attached to the upper surface 11 a of the backing material 11, and the solar cell 6 is further attached on the metal panel 12 for the roof panel. The first configuration shown in FIG.
In the roof panel 10 with a solar cell according to the embodiment, the electric heating panel 21
In contrast, the roof panel 3 with solar cells
Reference numeral 3 does not have a heating element corresponding to the electric heating panel 21.

In this embodiment, the roof panel 33 with solar cells is used.
In the case where there is no snow on the top, as in the first embodiment,
The photovoltaic power generation is efficiently performed by the solar cell 6, and the generated power is supplied to the DC / AC converter 3 of the power distribution equipment 30 (see FIG. 7).
1 is supplied to the power supply terminal 5 or the power supply equipment 3 via the distribution board 4a. When the snow on the roof panel 33 with the solar cell is melted, the function of the DC / AC converter 31 is switched by operating the changeover switch 32 and the solar cell 6
Power to As a result, the solar cell 14 (see FIG. 6) generates heat due to its own resistance, and far infrared rays are radiated from the amorphous silicon layer 18 heated by the generated heat. 33 can efficiently melt the snow. At this time, the DC / AC converter 31 and the power distribution equipment 4 provided with the DC / AC converter 31 function as a current supply unit.

In this embodiment, the solar cell 14 itself
Since the far infrared rays are radiated by the heat generated by the (amorphous silicon layer 18 itself), the heating element 21 according to the first embodiment is used.
There is no need to separately install a heating means as in (electric heating panel), and it is possible to significantly reduce the cost. Further, since the roof panel 33 with solar cells can be reduced in size and weight, workability is also improved. Moreover, the amorphous silicon layer 18
Is near the snow cover on the roof panel 33 with solar cells, the heat of the amorphous silicon layer 18 effectively acts on the snow melting, the heating temperature of the amorphous silicon layer 18 may be low, and the solar cell 6 related to the snow melting may be used. The power required to supply power to the vehicle can be reduced, and the running cost can be significantly reduced.

Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in FIGS. 2 to 7 are denoted by the same reference numerals, and description thereof will be simplified. In FIG. 9, between the substrate 13 of the solar cell 6 and the metal plate 12 for the roof panel, a thin-film heating element 34 (heating layer) as a heating means is provided.
Is formed. As the thin-film heating element 34, a metal thin film or the like that generates heat when energized can be used. For example, if a so-called heating paint is used, it can be easily formed at a target position. The heat-generating paint is formed by mixing and dispersing a powder of a conductive material and a heat-generating material (resistance material) in a binder material, and by supplying a current to the applied dry film, the conductive material mixed in the dry film is formed. This is a resistance heating element in which the kinetic energy of free electrons of the conductive material is expressed as heat energy.

This exothermic paint can freely adjust the electric resistance (specific resistance) in a region of 0.2 Ω · cm or more. The arrangement position of the electrodes is free, and the power supply voltage can be arbitrarily adjusted from 3 to 240 V. The maximum heating temperature is as high as about 500 ° C, and the desired heating temperature can be stably obtained by repeated use. High heat generation efficiency exceeding the standard Joule heat can be obtained. , Easy to form, etc. From the heat generation efficiency, the effect of saving electricity bills during snow melting can be obtained. Also in the present embodiment, the snow melting is efficiently performed by the heat generated from the thin film heating element 34 and the far infrared rays radiated from the amorphous silicon layer 18 in the solar cell 14 heated by the generated heat. The running cost can be significantly reduced by a synergistic effect with the high heat generation efficiency of the paint.

The formation position of the coating film of the heat-generating paint employed as the heating means is not limited to between the substrate 13 of the solar cell 6 and the metal plate 12 for the roof panel as long as the solar cell 14 can be heated. It may be between the metal sheet 12 for the roof sheet and the backing material 11. Needless to say, the shape of the heat-generating paint film can be appropriately adjusted.

In the present embodiment, the thin film heating element 34 is energized by the DC / AC converter 31 (see FIG. 7) to generate heat, and this heat generation and the amorphous silicon layer 18 of the heated solar cell 14 are removed. The radiated far infrared rays can efficiently melt the snow on the roof panel 33 with solar cells. Moreover, in the present embodiment, the second
Compared with the heating of the amorphous silicon layer 18 in the embodiment, the heating temperature of the thin film heating element 34 can be easily adjusted, and the amorphous silicon layer 18 can be heated to a desired temperature without excess or shortage.
There is no need to worry about the solar power generation performance. The thin-film heating element 34 integrated into the solar cell 6 is:
Because it is close to the snow on the roof panel 33 with solar cells,
The heat generation can be made to act efficiently, and snow melting can be performed efficiently.

The heating means for heating the solar cell 6 is not limited to the first to third embodiments, and it goes without saying that various configurations can be adopted. Further, in each embodiment, for example, a far-infrared radiator having an anodic oxide film having fine irregularities formed on the surface of Al or an Al alloy material with a thickness of 4 μm or more can be attached to a roof panel with solar cells. It is. This far-infrared radiator has an emissivity of 85% or more, is formed in an appropriate shape, and is near the heating element 21 in the first embodiment, near the solar cell 6 in the second embodiment, and in the third embodiment. When attached near the thin-film heating element 34, a large amount of far-infrared rays are radiated by heating to improve the snow melting efficiency.

[0037]

As described above, according to the roof panel with the solar cell according to the first aspect, the ceramic layer or the amorphous silicon layer provided in the solar cell is heated by the heating means, so that the heat generation of the heating means is achieved. And the far infrared rays radiated from the ceramic layer or the amorphous silicon layer to efficiently melt the snow on the roof slab. (B) Far-infrared rays act on the entire snow cover on the roof slab to melt the snow, so that the bridge phenomenon of the snow cover accompanying the progress of the snow melt can be prevented and the snow melting efficiency can be reduced. (C) According to the above (b), when the snow that has collapsed in the bridge state suddenly falls on the roof shingle and damages the roof shingle with solar cells. There is no worry that Tsu, an excellent effect such as to improve the durability of the roof.

[0038] As described in claim 2, the heating means includes:
Adopting a configuration in which the heating element is arranged extending along the solar cell on the back side of the solar cell, (d) a degree of freedom is obtained in the configuration of the heating element. By using a roofing plate with a battery, an excellent effect that the workability of the roof can be improved can be obtained.

According to a third aspect of the present invention, when the heating element is a heating resistor that emits far-infrared rays when energized, (e) both heat generation from the heating resistor and far-infrared rays are converted to snow. (F) The heat generated from the heat generating resistor and the far infrared rays can effectively contribute to the radiation of the far infrared rays from the solar cell, and therefore, the far infrared rays acting on the snow cover. And an excellent effect that snow melting can be performed more effectively can be obtained.

According to a fourth aspect, the heating means comprises:
If a configuration that is an energizing means for energizing the solar cell is adopted, (g) a roof panel with a solar cell does not require a heating element for heating the solar cell, and the number of parts is reduced, and cost can be reduced. (H) the existing power supply equipment or power distribution equipment can be used as the power supply means, and the equipment cost can be reduced. (I) the solar cell itself adjacent to the snow cover on the roof panel with solar cells Since the heat and far-infrared rays act on the snow to melt the snow, the heat and far-infrared rays can be applied directly to the snow cover, making it possible to efficiently melt the entire snow cover on the roof panel with solar cells. The effect is obtained.

According to a fifth aspect of the present invention, the power supply facility and the solar cell are connected via a power distribution facility for power distribution from the power supply facility, and the power supply of the power generated by the solar cell is performed. Supply to equipment, and power supply from the power supply equipment to the solar cell is configured to be switchable by the power distribution equipment, at the time of power supply from the power supply equipment to the solar cell, the power distribution equipment is the When a configuration functioning as an energizing unit is adopted, the solar cell can be heated by supplying electric power supplied from the existing power supply equipment to the solar cell via the power distribution equipment. This eliminates the need for equipment for installation, and can be implemented with existing equipment, thereby reducing costs and improving workability.

According to a sixth aspect of the present invention, there is provided a metal plate for a roof plate on which the solar cell is attached, wherein the heating means is a thin film provided between the metal plate for the roof plate and the solar cell. When the configuration of the heating element is adopted, (k) the solar cell is heated by the heating of the thin-film heating element, so that it is not necessary to secure electric resistance for the solar cell to generate heat, and the degree of freedom in designing the solar cell is reduced. (L) By adjusting the power to be supplied, the amount of heat generated from the thin film heating element can be easily adjusted, and an excellent effect of improving the snow melting efficiency can be obtained.

According to a seventh aspect of the present invention, when the thin-film heating element is made of a heat-generating paint applied to the solar cell or the metal plate for a roof plate, (m) a solar cell or a roof with a solar cell is adopted. It is possible to reduce the size and weight of the plate, to improve the degree of freedom in shape, to facilitate the formation, and to achieve excellent effects such as cost reduction.

As set forth in claim 8, the above claims 1 to 7
A solar cell roof with a solar cell according to any one of the above,
The roof panel with solar cells can efficiently perform both snow melting and solar power generation, and has an excellent effect that solar power generation can be effectively used even in a snow-covered area.

[Brief description of the drawings]

FIG. 1 is an overall front view showing a first embodiment of a roof panel with solar cells of the present invention.

FIG. 2 is a partially cutaway perspective view showing the snow melting / solar power generation roof of FIG. 1;

3 is a partially cutaway perspective view showing a roof panel with a solar cell applied to the snow-melting / solar power generation roof of FIG. 2;

4 is a perspective view showing a joined state of the roof panel with solar cells of FIG. 3;

FIG. 5 is an enlarged sectional view showing an example of a solar cell attached on the roof panel with solar cells of FIG.

FIG. 6 is an enlarged sectional view showing an example of a solar cell of the solar cell in FIG.

FIG. 7 is an overall front view showing a photovoltaic roof combined with snow melting according to a second embodiment of the present invention.

8 is a partially cutaway perspective view showing a roof panel with a solar cell applied to the photovoltaic roof combined with snow melting shown in FIG. 7;

FIG. 9 is a diagram showing a third embodiment of the present invention, and is an enlarged sectional view showing the vicinity of a solar cell.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Solar power generation roof combined with snow melting, 3 ... Power supply equipment, 6 ... Solar cell, 10 ... Roof plate with solar cell, 12 ... Metal plate for roof plate, 18, 18a, 18b, 18c ... Amorphous silicon layer, 21 ... Heating Means, heating element, heating resistor (electric heating panel), 30: power distribution equipment, 31: heating means, energizing means (DC / AC converter), 33: roof panel with solar cell, 34
... Heating means, thin-film heating element (heating layer, heating paint).

Claims (8)

[Claims] 1. A solar cell (6) attached to a surface thereof, and heating means (21, 31, 34) for heating the solar cell, wherein the solar cell comprises a silicon crystal layer or an amorphous silicon layer ( 18, 18a, 18b, 18c), wherein the heating means emits far-infrared rays from the silicon crystal layer or the amorphous silicon layer by heating the solar cell. (10, 33). 2. The roof panel with solar cells according to claim 1, wherein the heating means is a heating element (21) extending along the solar cells on the back side of the solar cells. . 3. The roof panel with solar cells according to claim 2, wherein the heating element is a heating resistor (21) that emits far-infrared rays when energized. 4. The shingle with solar cells according to claim 1, wherein said heating means is an energizing means (31) for energizing said solar cells. 5. The power supply facility and the solar cell are connected via a power distribution facility (30) for power distribution from the power supply facility (3), and the power supply of the power generated by the solar cell is performed. Supply to equipment, and power supply from the power supply equipment to the solar cell is configured to be switchable by the power distribution equipment, at the time of power supply from the power supply equipment to the solar cell, the power distribution equipment is the 5. A function as an energizing means.
The shingle with a solar cell as described. 6. A thin-film heating element (34) provided between the roof metal plate and the solar cell, wherein the heating means comprises a roof metal plate on which the solar cell is attached. The roof panel with a solar cell according to claim 1, wherein: 7. The roof panel with solar cells according to claim 6, wherein the thin-film heating element is a heat-generating paint applied to the solar cell or the metal plate for the roof panel. 8. A solar power generation roof (1) comprising the roof panel with solar cells according to any one of claims 1 to 7.