Coating material for cooling solar panel device and method for manufacturing the same, and solar panel device on which coating material for cooling is coated

Abstract

To provide a solar panel device capable of efficiently cooling a solar panel using no electric power with a simple configuration, and a method for manufacturing the same.SOLUTION: A coating material is applied on a rear surface of a solar panel device that receives sunlight on a surface and generates power to cool the solar panel device. The coating material for cooling contains, as a composition ratio, 30% of graphite, 60% of a primer, 6% of methanol, 2% of a dispersant, and 2% of sodium chlorate.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cooling technique for a panel (hereinafter referred to as a "solar panel") in which a plurality of photovoltaic cells (cells) used for solar power generation are arranged. [Background technology]

[0002] It is known that the power generation efficiency of solar panels drops rapidly when the panel temperature exceeds 25°C. In particular, in the summer when there is a lot of sunlight, the panel surface temperature can reach 60-80°C or higher during the day, which has been confirmed to reduce the amount of power generated by nearly 30%. Conversely, it is possible to increase the amount of power generated by cooling the panel. Therefore, various panel cooling technologies have been proposed to suppress power generation loss.

[0003] For example, the cooling system disclosed in Patent Document 1 employs a configuration in which a fluid sprayer is provided on the top of a panel and a sheet-like fluid is sprayed from the fluid sprayer onto the outer surface of the panel for cooling. Also, the cooling device disclosed in Patent Document 2 employs a configuration in which a panel cooling pipe is provided on the rear surface of the panel and a heat medium for cooling in the panel cooling pipe absorbs heat to generate natural convection, thereby circulating the heat medium. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special table 2016-503284 [Patent Document 2] Patent Publication No. 2015-213395 Summary of the Invention [Problem to be solved by the invention]

[0005] However, cooling systems that flow fluid over the exterior surface of the panel require the collection and circulation of the fluid, which necessitates equipment for circulating the cooling fluid and further poses the problem of the consumption of electricity to cool the panels.

[0006] In addition, although cooling devices that utilize natural convection of the heat transfer medium can reduce the power consumption required for cooling by using natural convection, power is required to operate the temperature sensor and exhaust valve, and equipment to circulate the heat transfer medium is required, making it difficult to avoid the device configuration becoming complicated and large.

[0007] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a solar panel device that is simply configured and capable of efficiently cooling a solar panel without using electricity, and a method for manufacturing the same. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a cooling paint for cooling a solar panel device that receives sunlight on its surface and generates electricity by being applied to the back surface of the solar panel device, the cooling paint comprising the following composition: 30% graphite, 60% primer, 6% methanol, 2% dispersant (RH40), and 2% sodium chlorate.

[0009] The graphite contained in the cooling paint may include fine particles having a particle size of 30 μm or less and coarse particles having a particle size in the range of 100 to 500 μm.

[0010] The present invention also provides a solar panel device comprising a solar panel that receives sunlight on its surface to generate electricity, and cooling paint applied to at least a portion of the back surface of the solar panel, wherein the cooling paint is the cooling paint of the present invention described above.

[0011] The present invention also relates to a method for producing the cooling paint of the present invention, which is characterized in that the following steps 1 to 4 are carried out in this order. Step 1: Add and dissolve sodium chloride in methanol to create a methanol mixture. Step 2: The methanol mixture prepared in step 1 is added to the primer with stirring to form a primer mixture. Step 3: Add graphite to the primer mixture prepared in step 2. Step 4: Add dispersant (RH40) to the mixture made in step 3 and mix. Effect of the Invention

[0012] According to the present invention, it is possible to efficiently cool a solar panel with a simple configuration and without using electricity. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 shows a solar panel device according to one embodiment of the present invention, where (A) is a plan view showing the front side (light-receiving surface) and (B) is a bottom view showing the back side. [Diagram 2] 4 is a table showing the composition of a cooling paint applied to the back surface of a solar panel device according to an embodiment of the present invention. [Diagram 3] FIG. 2 shows the backside of a solar panel apparatus coated with paint according to an embodiment of the present invention. [Figure 4] FIG. 1 illustrates a solar panel arrangement set up for testing. [Diagram 5] 4 is a graph showing test results of a solar panel apparatus according to an embodiment of the present invention. [Figure 6] 4 is a graph showing test results of a solar panel apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the following description of the preferred embodiments is not intended to limit the technical scope of the present invention.

[0015] 1 is a diagram showing a solar panel device according to one embodiment of the present invention, where (A) is a plan view showing the front side (light receiving surface) and (B) is a bottom view showing the back side. As illustrated in the figure, in the solar panel device according to one embodiment of the present invention, a solar panel 100 is fixed to a frame 102, and a cooling paint 103 is applied to the back sheet 101 side (back side) of the solar panel 100. Heat from the solar panel 100 is absorbed from the internal contact surface of the cooling paint 103 and dissipated from the surface of the paint 103 into the air.

[0016] The solar panel 100 itself may be a commonly available one, and is usually made up of an array of multiple cells sealed, with a back sheet 101 provided on the rear surface opposite the light-receiving surface. Furthermore, a cable box 104 bundling cables for outputting electromotive force from the multiple cells is provided on the rear surface.

[0017] <Cooling paint> 2 is a table showing the composition of the cooling paint applied to the back surface of the solar panel device according to one embodiment of the present invention. As shown in the table, the cooling paint contains 30% graphite, 60% primer, 6% methanol, 2% dispersion (RH40), and 2% sodium chlorate.

[0018] Here, the graphite contained in the cooling paint may contain fine particles with a particle size of 30 μm or less and coarse particles with a particle size in the range of 100 to 500 μm. Also, the primer may be water-based or solvent-based.

[0019] Next, a method for producing the cooling paint having the above-mentioned structure will be described. To produce the cooling paint 103, the following steps 1 to 4 are carried out in this order.

[0020] Step 1: Add and dissolve sodium chloride in methanol to create a methanol mixture. Step 2: The methanol mixture prepared in step 1 is added to the primer with stirring to form a primer mixture. Step 3: Add graphite to the primer mixture prepared in step 2. Step 4: Add dispersant (RH40) to the mixture made in step 3 and mix.

[0021] Next, a procedure for applying the cooling paint to the solar panel device will be described. The cooling paint is applied to the rear surface (rear panel) of the solar panel device using a roller or a brush. Fig. 3 is a diagram showing the rear surface of a solar panel device to which paint has been applied according to one embodiment of the present invention, and shows the state after the cooling paint has been applied. It should be noted that the cooling paint to be applied to the solar panel device is desirably applied as a paint layer having a thickness of about 500 µm, as an example.

[0022] Next, the cooling effect of the solar panel device to which the cooling paint of this embodiment is applied will be described. FIG. 4 is a diagram showing a solar panel device set up for testing. Also, FIGS. 5 and 6 are graphs showing the test results of the solar panel device. In both graphs, the horizontal axis indicates elapsed time and the vertical axis indicates temperature, and the temperature change is shown when the cooling paint of this embodiment is not applied (Cont_Top) and when the cooling paint of this embodiment is applied (Paint_Top). Also, the graph in FIG. 5 is when a coarse-grained graphite paint is applied, and the graph in FIG. 6 is when a fine-grained graphite paint is applied. As shown in these graphs, when the cooling paint of this embodiment is applied, the effect of suppressing the temperature rise of the solar panel device can be achieved compared to when the cooling paint is not applied.

[0023] As described above, the cooling paint of the present embodiment and the solar panel device coated with the paint make it possible to efficiently cool the solar panel with a simple configuration and without using electricity. [Explanation of symbols]

[0024] 100 solar panels 101 Back Seat 102 Frames 103 Cooling paint 104 Cable Box C cell (solar cell)

Claims

1. A coating material for cooling a solar panel device that receives sunlight on its front surface and generates electricity is applied to the rear surface of the solar panel device, the coating material being for cooling the solar panel device, The cooling paint has the following composition ratio: It contains 30% graphite, 60% primer, 6% methanol, 2% dispersant, and 2% sodium chlorate. A paint for cooling a solar panel device.

2. The graphite contained in the cooling paint is It contains fine particles with a particle size of 30 μm or less and coarse particles with a particle size in the range of 100 to 500 μm.

2. The coating material for cooling a solar panel device according to claim 1.

3. A solar panel that receives sunlight on its surface and generates electricity; A solar panel device comprising: a cooling paint applied to at least a portion of the back surface of the solar panel; The cooling paint is the paint according to claim 1 or 2. A solar panel device characterized by:

4. A method for producing a coating material for cooling a solar panel device according to claim 1 or 2, characterized in that the following steps 1 to 4 are carried out in this order: Step 1: Add and dissolve sodium chloride in methanol to create a methanol mixture. Step 2: The methanol mixture from step 1 is added to the primer with stirring to form a primer mixture. Step 3: Add graphite to the primer mixture prepared in step 2. Step 4: Add dispersant (RH40) to the product made in step 3 and mix.

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