JP2014146736A - Installation structure of photovoltaic power generation panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technological means which enables even an installation worker who does not have an electrification amount control skill, a heat generation sheet lamination skill or adhesion skill to install a photovoltaic power generation panel with a snow melting device having sufficient durability, regarding an installation structure of the photovoltaic power generation panel comprising the snow melting device which is installed in a post-fitting manner on the roof.SOLUTION: As a heating element for melting snow, a heating wire having an insulation coating is used and this is bent in a continuous U shape and directly added to the back of a photovoltaic power generation panel. At least a linear portion in the continuous U shape of the heating wire is pressed into contact with the back of the photovoltaic power generation panel by a plate-like or beam-like member having satisfactory heat conductivity mounted to a support frame supporting the photovoltaic power generation panel. As the member, it is preferable to use a plurality of aluminum molds, both ends of each aluminum mold being supported by the support frame and each aluminum mold having an H-shaped or T-shaped cross section including an outward recessed groove in a concatenation part of a flange and a web.

Description

  The present invention relates to an installation structure of a photovoltaic power generation panel installed on a roof of a house, and more particularly to an installation structure of a photovoltaic power generation panel provided with a snow melting device installed later on an existing roof.

  As part of the solution to environmental and nuclear problems, solar panels are being installed on the roofs of houses. A photovoltaic power generation panel (hereinafter, also simply referred to as “panel”) is a structure in which photoelectric conversion cells in which a predetermined number are arranged vertically and horizontally are connected in series, and is also referred to as a photovoltaic power generation module. It has become. In order to generate electricity efficiently, it is preferable to install the panel obliquely toward the south, and it is common to install the panel on the south-facing roof with an inclination corresponding to the slope of the roof.

  Although the solar power generation panel itself may be used as a roofing material, the solar power generation panel is often installed later on an existing roof by supporting the periphery of the panel with a support frame having legs. In this case, a gap is formed between the roof surface and the panel.

  On the other hand, in snowy areas, if snow on the inclined roof (roof snow) slides down at once, there is a risk of harming pedestrians below, so a snow clasp that protrudes downward from the roof surface is provided. ing. If the roof has a snow guard, the installation height of the panel is usually higher than the height of the snow guard. Therefore, if a photovoltaic power generation panel is installed later on the roof, there arises a problem that it becomes impossible to prevent the snow from falling on the roof.

  In order to avoid this problem, and to prevent the generation of power even if the sunlight on the panel is blocked by sunlight, it is possible to install a snow melting device on the solar power generation panel. A structure has been proposed.

  For example, Patent Document 1 shows an example in which a thin film heating element (heating layer) is formed between a solar cell substrate and a roof plate metal plate. Examples of the thin film heating element include the use of a metal thin film or a heat generating paint that generates heat when energized. Patent Document 2 proposes a technique for melting snow by energizing the photoelectric conversion cell itself to generate heat in the panel.

  Patent Document 3 proposes a technology for providing a heat generation sheet formed by sandwiching a meandering heat generation wire between aluminum foils on the lower side of a solar power generation panel, and for melting snow on the power generation panel by the heat generation. Yes. Patent Document 4 proposes a structure in which heating wires are arranged on a frame member of a power generation panel.

  Furthermore, Patent Document 5 proposes a solar cell module with a snow melting function having a structure in which a transparent sheet heating sheet is installed on the lower surface of a solar cell module in which a solar cell is sandwiched between two glass panels. . Patent Document 6 proposes a structure in which a metal plate is laminated on the back surface of a photovoltaic power generation panel via electrical insulation, and an electric heating sheet is provided on the back surface of the metal plate.

Japanese Patent Laid-Open No. 11-124977 JP 2002-319687 A Registered Utility Model No. 3090961 JP 2004-278270 A Japanese Patent Laid-Open No. 2004-39553 JP 2012-151224 A

  The conventional snow melting devices for photovoltaic power generation panels can be broadly divided into those that energize the photoelectric conversion cell itself to generate heat, and those that provide a transparent heating element on the front side of the panel (on which sunlight is incident). These can be broadly classified into those in which a heating element is provided on the back surface of the panel and those in which a heating element is provided along a frame supporting the panel. In the system in which the heating element is provided on the back of the panel, a structure in which the heating layer is sandwiched between insulating layers, or a heating wire provided with an insulating film is sandwiched between a thin metal plate or a heat insulating plate to form a sheet or plate, and these are adhered to the panel back The structure is adopted.

  A solar power generation panel provided by a panel manufacturer is usually not provided with a snow melting device. Therefore, the snow melting device is added when the panel is installed, but it is difficult for a general installer to add the snow melting device. For example, in the method of energizing the photoelectric conversion cell itself, control and protection means are required to prevent the energization amount allowed for the cell from being exceeded. The structure in which a sheet-like or plate-like heating element is attached to the front or back of the panel requires a technique different from the panel installation technique for the production of the sheet-like heating element. There arises a problem that weather resistance or durability cannot be guaranteed due to peeling.

  The structure in which the heating lines are arranged along the frame material supporting the panel is considered to be relatively easy to work, but the snow on the panel is removed by sliding it off from the surrounding snow. Therefore, the fall of the roof snow cannot be prevented.

  This invention can install a photovoltaic power generation panel with a snow melting device having sufficient durability even for panel installation workers who do not have current flow control technology, heating sheet laminating technology or adhesive technology. The problem is to provide possible technical means.

  In the present invention, a linear heating element (heating line) 4 having an insulating coating is used as a heating element for melting snow, bent in a continuous U-shape that reciprocates the linear heating element 4 and directly on the back surface of the photovoltaic power generation panel 1. By adopting a structure to be attached, the above-mentioned problems are solved. The heating wire 4 is a plate-like or girder-like member 3 with good heat conductivity, in which at least the straight U-shaped straight portion 4a is attached to the support frame 2 supporting the photovoltaic power generation panel 1. Press against the back of 1.

  A preferred photovoltaic panel installation structure of the present invention includes a photovoltaic panel 1 that is supported at the periphery by a support frame 2 and spaced from the roof surface, and both ends are supported by the support frame 2. An aluminum mold member 3 having a flange upper surface 31a attached to the rear surface of the photovoltaic power generation panel 1 and having an H-shaped or T-shaped cross section having an outwardly recessed groove 33 at the connecting portion between the flange 31 and the web 32. A plurality of mold members 3 and a heating wire 4 bent into a continuous U-shape that reciprocates and having a linear portion 4 a accommodated in the concave groove 33 are provided. The aluminum mold 3 is provided with a notch 3 a that opens the side surface of the groove 33 at the boundary between the arc and the straight line in the bent portion of the heating wire 4.

  The heating wire 4 is used for commercial power supply in which the heating temperature is automatically controlled by arranging electric wires in parallel at intervals in a resistor having a characteristic that the resistance value increases as the temperature rises. A heating wire (semiconductor heater) is provided. Using such a heating wire, by turning on / off the power to the heating wire manually with a signal from a snowfall sensor, a temperature sensor or the like, snow accumulation or snowfall of the photovoltaic power generation panel is prevented.

  According to the installation structure of the solar power generation panel of the present invention, even if the installer does not have the power control technology to the snow melting device, the manufacturing technology of the laminated body, etc., the solar power generation in which no snow melting means is provided. Panels can be used to install solar power generation panels with snow melting devices, to promote the spread of solar power generation panels in snowy areas, to improve the durability of installed solar power generation panels or to reduce maintenance work There is an effect that can be.

Top view of photovoltaic panel Cross-sectional side view of a photovoltaic panel installed on a tiled roof Rear view of a photovoltaic power generation panel installed with the structure of this invention Partial perspective view of the mold material provided on the back of the photovoltaic power generation panel

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a photovoltaic power generation panel 1 in which a plurality of photoelectric conversion elements 11 are arranged on one panel. The periphery of the panel 1 is supported by the peripheral frame 21 of the support frame 2.

  FIG. 2 is a cross-sectional side view of a photovoltaic power generation panel installed on a tile roof. The support frame 2 supporting the photovoltaic power generation panel 1 includes a peripheral frame 21 and four to six legs 22. As shown in FIG. 3, the illustrated support frame includes a crosspiece 23 that supports the lower surface of the panel at the center of the panel. The photovoltaic power generation panel 1 is installed with the legs 22 of the support frame placed on the roof tile 6, and there is a gap between the roof tile 6 and the panel 1.

  In the tile roof of the snowfall area, a snow retaining 61 is provided on a part of the roof tiles 6. The photovoltaic power generation panel 1 installed on the roof via the support frame 2 usually has a height substantially equal to or slightly higher than the snow guard 61 provided on the roof.

  FIG. 3 is a rear view of the photovoltaic power generation panel installed with the structure of the present invention. On the back side of the panel 1, a plurality of aluminum molds 3 are fixed to the peripheral frame 21 of the support frame at both ends, and the flange upper surface 31a (see FIG. 4) is attached to the back of the panel 1. It is mounted with. Further, a heating wire 4 bent in a continuous U shape is attached to the back surface of the panel 1. The straight line portion 4a indicated by the broken line in FIG. 3 of the heating wire 4 is attached to the rear surface of the panel while being housed in the concave groove 33 (see FIG. 4).

  The heating wire 4 has two electric wires running in parallel, one end is connected to a commercial power source, and the other end is extended to the back surface of the photovoltaic power generation panel installed adjacent to the heating wire 4 in a similar structure. Attached to the back surface of the panel, when the adjacent panel disappears, its end is insulated.

  The aluminum mold 3 is a drawing material having an H-shaped or T-shaped cross section having an outwardly recessed groove 33 at a connecting portion between the flange 31 and the web 32. The depth of the groove 33 is such that when the upper surface 31a of the flange 31 is attached to the back surface of the photovoltaic power generation panel 1, the insulating film of the heating wire 4 housed in the groove 33 is pressed against the back surface of the panel. Is provided. The aluminum mold 3 is cut in accordance with the dimensions of the panel 1, and the side surfaces of the flange 31 and the concave groove 33 are cut out over a necessary length in a portion 3 a for drawing out the heating wire 4 accommodated in the concave groove 33. The both ends are attached to the peripheral frame 21 of the support frame.

  The heating wire 4 bent in a continuous U-shape is disposed on the back side of the panel 1 with its straight portion 4a being housed in the concave groove 33 of the aluminum mold material and both ends of the straight portion being pulled out from the notch 3a. Has been. The straight line portion 4a of the heating wire is pressed against the back surface of the panel 1 by the aluminum mold 3, and the arc portion 4b between the straight portions on both sides is attached to the back surface of the panel 1 due to the rigidity of the heating wire itself. It becomes.

  If the heating wire 4 is connected to a commercial power source and energized in this state, the heat of the heating wire 4 is directly transmitted to the back surface of the panel 1 from the entire upper surface 31a through the flange of the aluminum mold material which is a good thermal conductor. The panel 1 is heated to prevent snow from accumulating on the panel 1. The heat of the arc portion 4b of the heating wire that is in contact with the back surface of the panel is also transmitted to the back surface of the panel 1.

  An aluminum mold is used as the aluminum mold, and the heating wire is formed in a state where both sides of a rectangular heat insulating plate 5 (imaginary line in FIGS. 3 and 4) such as a foamed resin plate are inserted between the upper and lower flanges 31 and 35. If it is installed on the back side of the arc portion 4b, it is possible to prevent heat loss due to the diffusion of the exposed heating wire from the arc portion 4b. This heat insulating plate 5 is also effective in pressing the arc portion 4b of the heating wire against the back surface of the panel 1 to prevent lifting.

  The base end of the heating wire 4 is drawn indoors together with the electric wire of the photovoltaic power generation panel 1 and connected to a commercial power supply via at least a manual on / off switch. As a wire pulling structure, a roof tile with a wire pulling port with a cover is provided on the roof, and a structure that pulls in through the pulling port or a structure that pulls in from under the eaves is put into practical use. Just do it. In addition, it is of course possible to automatically control the on / off of power to the heating wire by installing a snowfall sensor or a temperature sensor, and since it has been proposed in the above-mentioned patent document, such control is performed when necessary. Should be adopted.

1 Photovoltaic panel 2 Support frame 3 Aluminum mold
3a Notch 4 Heating wire
4a Straight section
31 Flange
31a Top surface of flange
32 web
33 groove

In the present invention, a linear heating element (heating line) 4 having an insulating coating is used as a heating element for melting snow, bent in a continuous U-shape that reciprocates the linear heating element 4 and directly on the back surface of the photovoltaic power generation panel 1. By adopting a structure to be attached, the above-mentioned problems are solved. The heating wire 4 is a back surface of the photovoltaic panel 1 with a beam- like member 3 having good heat conductivity and having at least a straight U-shaped straight portion 4a attached to a support frame 2 supporting the photovoltaic panel 1. Press to touch.

Installation structure of solar panels of this invention is supported the periphery with supporting frame 2 and the photovoltaic panel 1 installed at a gap between the roof surface, is supported at both ends by the support frame 2 An aluminum mold member 3 having a flange upper surface 31a attached to the rear surface of the photovoltaic power generation panel 1 and having an H-shaped or T-shaped cross section having an outwardly recessed groove 33 at the connecting portion between the flange 31 and the web 32. A plurality of mold members 3 and a heating wire 4 bent into a continuous U-shape that reciprocates and having a linear portion 4 a accommodated in the concave groove 33 are provided. The aluminum mold 3 is provided with a notch 3 a that opens the side surface of the groove 33 at the boundary between the arc and the straight line in the bent portion of the heating wire 4.

Claims (3)

A photovoltaic panel that is supported at the periphery by a support frame and spaced from the roof surface; and
A heat transfer material supported by the support frame and attached to the back surface of the photovoltaic power generation panel, the heat transfer material having a concave groove on the attached surface;
A heating wire that is bent into a reciprocating continuous U-shape and has at least a straight line portion accommodated in the concave groove and has its insulating coating pressed against the back surface of the photovoltaic panel. Installation structure of solar power generation panel. A photovoltaic panel that is supported at the periphery by a support frame and spaced from the roof surface; and
An H-shaped or T-shaped aluminum member that is supported at both ends by the support frame and has a flange upper surface attached to the rear surface of the photovoltaic power generation panel, and has an outwardly recessed groove at the joint between the flange and the web. A plurality of cross-section aluminum molds,
A heating wire that is bent into a continuous U-shape that reciprocates and has a straight line portion housed in the groove,
The aluminum mold has a notch that opens a side surface of the groove at the boundary between the arc and the straight line in the bent portion of the heating wire.
Installation structure of the photovoltaic power generation panel on the roof.   The installation structure of the photovoltaic power generation panel according to claim 2, wherein the aluminum mold is an aluminum mold having an H-shaped cross section.

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