JP2000320083A - Solar cell module and roof member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the effect of heat insulation and to make an operating environmental temperature high by a constitution wherein a heat insulator of which the gas internal pressure is lower than a specified value is provided on one side of a solar battery panel on the other side of which the sunlight is incident. SOLUTION: A heat insulator 22 is constituted of a core material 31 having heat insulating properties and of a jacket material 32 covering the surface of the core material 31 airtightly. On the occasion, the jacket material 32 is made to have a laminated structure of an outside protective film having thrust resistance, an intermediate barrier layer preventing leak of heat and an inside seal film having airtightness at least. Besides, a getter material 37 absorbing gas inside the jacket material 32 is filled inside it. Then the gas internal pressure of the heat insulator 22 can be reduced to 1 atm pressure or below and, by reducing the pressure to be lower than 10 torr, particularly, the thermal conductivity can be lowered sufficiently. Since an operating environmental temperature of a solar battery panel can be made high, according to this constitution, it is possible to improve the efficiency of photoelectric transfer and to attain an improvement in a rate of deterioration by light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell module for converting sunlight into electric energy and a roof member comprising the solar cell module.

[0002]

2. Description of the Related Art As one of means for obtaining electric energy, a solar cell module having a solar cell panel is known, and this solar cell module may be installed in a place easily exposed to solar energy such as a building roof. Many.

It is considered that the solar cell module itself is used as a roof member. In such a case, the solar cell module is laid on a base material of a building roof.

[0004] In a solar cell module used as a roof member, it is known that the higher the operating environment temperature of the solar cell panel, the more the photoelectric conversion efficiency can be improved and the recovery of the photoelectric conversion efficiency deterioration can be reduced, that is, the light deterioration rate can be improved. Have been. Therefore, by providing a heat insulator between the solar cell panel and the base material of the roof, the operating environment temperature is increased so that the energy of sunlight incident on the solar cell module is not escaped. .

[0005]

Conventionally, as the heat insulator, ordinary glass wool or foam elastic material has been provided between the solar cell panel and the base material of the roof.

By providing a heat insulator between the solar cell panel and the base material, the heat insulating effect is improved, and the photoelectric conversion efficiency and the light deterioration rate can be improved. However,
Simply providing a normal heat insulator on the back side of the solar cell panel does not provide a sufficient heat insulating effect of the heat insulator, so that the operating environment temperature of the solar cell panel cannot be sufficiently increased. there were.

SUMMARY OF THE INVENTION The present invention provides a solar cell module and a roof member comprising the solar cell module, in which the heat insulating effect of the heat insulator is sufficiently increased so that the operating environment temperature of the solar cell panel can be increased. is there.

[0008]

The invention of claim 1 is characterized in that a heat insulator having a gas internal pressure of less than 1 atm is provided on the other surface of the solar cell panel on which sunlight enters from one surface. Solar module.

According to a second aspect of the present invention, in the first aspect of the present invention, the heat insulator is formed of a core material having heat insulating properties and a material that blocks the passage of air, covers the core material, and depressurizes the inside. And a bag-shaped outer cover material.

According to a third aspect of the present invention, in the solar cell module according to the second aspect of the present invention, a getter material for absorbing gas inside the outer casing material is provided inside the outer casing material. .

[0011] The invention of claim 4 is the invention of claim 2 or claim 3.
In the invention of the above, the outer covering material has a structure in which an outer protective film having butt resistance, an intermediate barrier layer for preventing heat leakage, and an inner sealing film having at least airtightness are laminated. A solar cell module characterized in that:

According to a fifth aspect of the present invention, in the first or second aspect, the gas internal pressure of the heat insulator is 10 torr.
r is less than r.

According to a sixth aspect of the present invention, there is provided a roof member comprising a solar cell module laid on a base material of a roof, wherein the solar cell module is provided on the other surface of a solar cell panel on which sunlight enters from one surface. A heat insulator is joined, and the heat insulator is composed of a core material and a bag-shaped outer cover material that is formed of a material that blocks air and covers the core material and has a depressurized inside. A roof member characterized by the above-mentioned.

According to the first aspect of the present invention, by setting the gas internal pressure of the heat insulator to less than 1 atm, the heat insulating effect can be improved as compared with the case where the gas internal pressure is at atmospheric pressure. The operating environment temperature of the solar cell panel provided with the body can be increased.

According to the second aspect of the present invention, since the heat insulator is composed of the core material and the jacket material which covers the core material and the inside of which is decompressed, the gas internal pressure is maintained at less than 1 atm. Becomes possible.

According to the third aspect of the present invention, the getter material for absorbing the gas generated inside the outer cover material is provided inside the outer cover material constituting the heat insulator, whereby It is possible to prevent the gas internal pressure from rising.

According to the fourth aspect of the present invention, since the covering material has a laminated structure of a protective film, a barrier layer, and a seal film, the covering material can prevent an increase in gas internal pressure of the heat insulator, The effect can be enhanced.

According to the fifth aspect of the present invention, since the gas internal pressure of the heat insulator is set to less than 10 torr, the heat insulating effect of the heat insulator can be further improved.

According to the invention of claim 6, when the solar cell module is used as a roof member, the operating environment temperature of the solar cell panel can be raised.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an embodiment of the present invention. In this embodiment, a solar cell panel 11 is used as a roof member 12 which is a solar cell module. Although details of the solar cell panel 11 are not shown, a plurality of cells are provided on a lower surface of the glass substrate, that is, a surface opposite to a surface on which sunlight enters. These cells output electrical energy by sunlight incident from the upper surface side of the glass substrate. Note that the cell provided on the glass substrate may be either a thin film type or a crystal type.

The solar cell module is not limited to one used as a roof member, and may be a type installed on a roof, a roof, on the ground, or a solar cell tile embedded in a tile.

As shown in FIG. 2, the solar cell panel 1
The mounting member 13 is provided on the lower surface of the cell 1 which is sealed with resin.
Are adhesively fixed. The mounting member 13 is formed of a metal plate such as a galvanized steel plate, an aluminum plate, and a stainless steel plate. An L-shaped bent flange portion 14 is formed on the distal end side of the mounting member 13, and a support 15 is mounted on the lower surface of the distal end portion.

The supporting member 15 is formed by, for example, extrusion molding of aluminum, and has a flat upper joining portion 16 joined to the lower surface of the mounting member 13.
A flat lower joint 18 joined and fixed to a base material 17 (shown in FIG. 1) of a roof of a building, and a pair of these joints 1
A cylindrical portion 19 provided between the tubes 6 and 18 is integrally formed.

As shown in FIG. 1, the roof member 12 is attached to the roof with the front end provided with the support 15 facing the eaves of the roof and the rear end facing the ridge. Thereby,
The roof member 12 is inclined low from the ridge side toward the eave side with respect to the horizontal plane as shown by an angle θ in FIG.

The upper part of one side surface of the cylindrical portion 19 is joined to the inner surface of the flange portion 14, and the joined portion is fixed by screws 21 screwed in from the outer surface side of the flange portion 14. Thereby, the solar cell panel 11 is attached and fixed to the base material 17 of the roof via the support 15.

On the lower surface of the mounting member 13, a heat insulator 22 having a structure to be described later is bonded and fixed over almost the entire surface. The lower surface of the heat insulator 22 is formed as a tapered joint surface 23 joined to the inclined surface of the base material 17. Thereby, the heat insulator 22 exhibits a buffering action for preventing the solar cell panel 11 from bending.

As shown in FIG. 2, an insertion portion 23 having a substantially U-shaped cross section is formed in the upper portion of one side of the cylindrical portion 19 of the support 15. This insertion part 23
Is mounted with a gasket 24 as a sealing material having a substantially U-shaped cross section.

As shown in FIG. 1, this gasket 24 has a liquid-tight state at the rear end of another solar cell panel 11 located on the lower side along the direction of the roof ridge and the eaves, that is, on the eaves side. Inserted. As a result, the solar panels 11
In the case of roofing, the rear end of the solar cell panel 11 located on the eaves side can be roofed while being inserted into the gasket 24 of the insertion portion 23 of the support 15 located on the ridge side.

As shown in FIG. 3, the heat insulating body 22 includes a core material 31 and a jacket material 3 in which the surface of the core material 31 is air-tightly covered.
2 and a vacuum heat insulating structure. The core material 31 has a function of maintaining the shape and maintaining a certain level of strength, such as urethane foam, styrene foam, silica powder, glass fiber, etc., having 0% closed cells, and a function of reducing the influence of radiation insulation. It is preferable to use a material.

As shown in FIG. 4, the outer cover material 32 has a laminated structure in which an outer protective film 33, an intermediate barrier layer 34, and an inner seal film 35 are laminated and adhered with an adhesive 36. .

As the protective film 33, for example, a nylon (trade name) film having excellent butt resistance is used, and has such a strength that a pinhole accompanying handling is hardly generated. As the barrier layer 34, an aluminum vapor-deposited polyester film 36 and an aluminum foil 37 adhered by an adhesive 36 are used to minimize heat leakage. For the seal film 35, polyacrylonitrile, which is a highly airtight material, or a polyolefin-based material having excellent moisture resistance is used.

When the core material 31 is covered with the jacket material 32 having the above-described configuration in a bag shape, the inside of the jacket material 32 is depressurized. Thereby, the gas internal pressure of the core material 31 is less than 1 atm. In this embodiment, the core 31
Gas pressure is less than 10 torr, preferably 1 to 0.1
set to torr.

FIG. 5 is a graph showing the relationship between the gas internal pressure and the thermal conductivity of the heat insulator 22 having the above-described structure. The thermal conductivity starts to decrease at a gas internal pressure of about 10 torr and becomes about 1 to 0.1.
At torr, the temperature drops sufficiently to be in a stable state. According to the measurement results, it was confirmed that when the gas internal pressure of the heat insulator 22 was 0.5 torr, the thermal conductivity was 0.004 to 0.003 kcal / mh ° C., which was 1/5 to 1/10 of that when no pressure reduction was performed. Was done.

When covering the core material 31 with the jacket material 32,
A getter material 37 is filled in the outer cover material 32.
After the core material 31 is sealed with the jacket material 32, the getter material 37 absorbs a gas remaining in the jacket material 32, a gas newly generated inside, and a gas entering from the outside by a chemical reaction. , Such as activated carbon. Since the chemical reaction of the getter material 37 is an irreversible reaction, the gas once absorbed is not released again.

According to the solar cell module thus configured, that is, the roof member 12, the solar cell panel 11
By reducing the gas internal pressure of the heat insulator 22 provided on the lower surface of the heat sink to 1 atm or less, the heat insulating effect of the heat insulator 22 can be improved.

In particular, the gas pressure of the heat insulator 22 is set to 10 to
By setting the heat conductivity to less than rr, the heat conductivity can be sufficiently reduced. Further, by setting the heat conductivity to 0.5 torr, the heat conductivity of the heat insulating body 22 can be reduced by one in comparison with the case where the gas internal pressure is atmospheric pressure. / 5 to 1/10.

As a result, when sunlight enters the solar cell panel 11, the heat absorbed by the solar cell panel 11 is not immediately radiated from the back side by the heat insulator 22. Can increase the operating environment temperature. As a result, it is possible to improve the photoelectric conversion efficiency and the light deterioration rate of the solar cell panel 11.

The outer cover 32 of the heat insulator 22 has a laminated structure of a protective film 33, a barrier layer 34 and a sheet film 35. Therefore, even if an external force accompanying the handling is applied, the protective film 33 is unlikely to have a pinhole, so that it is possible to prevent the outside air from entering the inside.

Further, the heat leakage is prevented by the barrier layer 34, so that the heat insulating effect can be enhanced.
Further, since the sheet film 35 has airtightness, even if a pinhole is formed in the protective film 33 or the barrier layer 34, the outside air enters the inside of the jacket material 31 by the sheet film 35, and the gas internal pressure is reduced. It can be prevented from becoming high.

Gas may remain in the core material 31 of the heat insulator 22, and gas may be released from the core material 31, and further, a pinhole is formed in the jacket material 32. There is a possibility that outside air may enter.

If a gas is present in the jacket material 32 due to such a cause, the gas internal pressure of the heat insulator 22 may increase, and the heat insulating effect may decrease.

However, the gas existing in the jacket material 22 depends on the getter material 37 provided in the jacket material 22.
Therefore, the gas pressure inside the jacket material 22 is prevented from increasing.

[0044]

According to the first aspect of the present invention, by setting the gas internal pressure of the heat insulator to less than 1 atm, the heat insulating effect of the heat insulator is improved as compared with the case where the gas internal pressure is at atmospheric pressure. Can be.

As a result, the operating environment temperature of the solar cell panel provided with the heat insulator can be increased, so that the photoelectric conversion efficiency is improved and the photoelectric conversion efficiency is restored, that is, the light deterioration rate is improved. Can be.

Further, since the heat insulating effect of the heat insulating body is improved, the heat insulating body can be made thinner as compared with the case where the same heat insulating effect is obtained as before, so that the solar cell module can be made compact and the appearance can be improved. .

According to the second aspect of the present invention, the heat insulator is composed of the core material and the outer cover material which covers the core material and whose inside is reduced in pressure.

Therefore, it is possible to reliably maintain the gas internal pressure of the heat insulator below 1 atm with a simple configuration.

According to the third aspect of the present invention, the getter material for absorbing the gas generated inside the jacket material is provided inside the jacket material constituting the heat insulator.

Therefore, even if a gas remains in the inside of the jacket material, a new gas is generated from the core material, or a gas enters from the outside, the getter material absorbs the gas. It is possible to prevent the gas internal pressure of the heat insulator from rising. That is, it is possible to reliably maintain the heat insulation characteristics set by the gas internal pressure of the heat insulator.

According to the invention of claim 4, the covering material has a laminated structure of a protective film, a barrier layer and a seal film.

[0052] Therefore, since the jacket material has a function of preventing an increase in the gas internal pressure of the heat insulator and enhancing the heat insulating effect, the heat insulating property of the heat insulator can be maintained and improved by this jacket material. .

According to the fifth aspect of the present invention, the gas internal pressure of the heat insulator is set to less than 10 torr.

Therefore, the heat insulating effect of the heat insulator can be further improved.

According to the sixth aspect of the present invention, when the solar cell module is used as a roof member, the heat insulating material bonded to the back surface of the solar cell panel is composed of a core material and a jacket material,
The inside of the jacket was depressurized.

Therefore, since the heat insulating effect of the heat insulator can be improved, the operating environment temperature of the solar cell panel can be increased, and the photoelectric conversion efficiency and the light deterioration rate can be improved. Furthermore, the roof member can also enhance the heat insulating effect of the building roof.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a solar cell module according to an embodiment of the present invention is laid on a base material of a roof.

FIG. 2 is an enlarged sectional view of a tip portion of the solar cell module.

FIG. 3 is a cross-sectional view of the heat insulator.

FIG. 4 is an enlarged cross-sectional view showing a part of a jacket material.

FIG. 5 is a graph showing the relationship between the gas internal pressure and the thermal conductivity of the heat insulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Solar cell panel 12 ... Roof member (solar cell module) 22 ... Heat insulator 31 ... Core material 32 ... Jacket material 33 ... Protective film 34 ... Barrier layer 35 ... Sheet film 37 ... Getter material

Claims (6)

[Claims] 1. A solar cell module, wherein a heat insulator having an internal gas pressure of less than 1 atm is provided on the other surface of a solar cell panel on which sunlight enters from one surface. 2. The heat insulator includes a core material having heat insulation properties,
2. The solar cell module according to claim 1, wherein the solar cell module is formed of a bag-shaped outer cover material that is formed of a material that blocks the passage of air, covers the core material, and has a reduced pressure inside. 3. The solar cell module according to claim 2, wherein a getter material for absorbing gas inside the outer cover material is provided inside the outer cover material. 4. The outer cover material has a structure in which an outer protective film having a thrust resistance, an intermediate barrier layer for preventing heat leakage, and an inner seal film having at least airtightness are laminated. The solar cell module according to claim 2 or 3, wherein: 5. The solar cell module according to claim 1, wherein a gas internal pressure of the heat insulator is less than 10 torr. 6. A roof member comprising a solar cell module laid on a base material of a roof, wherein the solar cell module has a heat insulator joined to the other surface of a solar cell panel on which sunlight enters from one surface. The heat insulating material comprises a core material, and a bag-shaped outer cover material formed of a material that blocks air and covering the core material and having a reduced pressure inside. Element.