Method for constructing protective system of air conditioner outdoor unit, and protective system of air conditioning outdoor unit

Abstract

To provide a method for constructing a protective system of an air conditioning outdoor unit, which protects an air conditioning outdoor unit from freezing rain.SOLUTION: A protective system 1 for an air conditioner outdoor unit is constructed such that a frame 4 supports a top plate 3 so that an upper surface of the top plate 3 has a predetermined inclination angle from a front surface to a back surface of an air conditioner outdoor unit 2 with respect to a horizontal plane, the frame 4 supports the top plate 3 so that there is a gap 5 between an upper surface of a housing of the air conditioner outdoor unit 2 and a bottom surface of the top plate 3 in a front view, and in a side view, the frame 4 has a through hole 4a, and in the front view, the top surface of the housing of the air conditioner outdoor unit 2 is hidden by the top plate 3.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method for constructing a protection system for an air conditioner outdoor unit that protects the air conditioner outdoor unit from freezing rain, and to a protection system for the air conditioner outdoor unit. [Background technology]

[0002] In recent years, abnormal weather has caused damages of various sizes. At the building equipment level, air conditioner outdoor units have been destroyed by hailstones. For example, the heat exchanger built into the outdoor unit of an air conditioner is protected by a casing, but it can be damaged by a direct hit from large hailstones.

[0003] One method of protecting the outdoor unit of an air conditioner from flying objects such as hail is to install a protective top plate. By installing a sufficiently large top plate on the top of the housing of the outdoor unit of the air conditioner, it becomes possible to protect the outdoor unit from flying objects.

[0004] However, the market for top panels to protect outdoor air conditioner units is not as developed as that for the air conditioners themselves, and technological progress has been slow. This is because the housing of the outdoor air conditioner unit also serves to protect the heat exchanger inside, so there has been no need to protect the outdoor air conditioner unit itself.

[0005] In this context, one prior art technique in which a top plate or the like is provided on top of an air conditioner outdoor unit is a sunshade roof for an air conditioner outdoor unit, in which fixing holes are provided on the bottom surface of the roof that shades the air conditioner outdoor unit, approximately symmetrically to match the width of the outdoor unit, L-shaped roof fixing devices that are supported and fixed to the fixing holes with screws or the like are placed on both sides of the top surface of the outdoor unit, and the angle can be changed within a specified range on the fixed surface between the roof fixing devices and supports that are fixed to the left and right corners of the top surface of the outdoor unit by circumscribing the roof fixing devices (Patent Document 1).

[0006] Another example of a similar technology is a sunshade cover for an air conditioner outdoor unit that protects the air conditioner outdoor unit from direct sunlight, characterized in that it has a cover main body that covers the top surface of the air conditioner outdoor unit, a support member that is placed on the top surface and supports the cover main body above the top surface, and a band member that is wrapped around the air conditioner outdoor unit and fixes the support member to the top surface (Patent Document 2).

[0007] The invention in Patent Document 1 has the potential to eliminate the accumulation of snow and fallen leaves by tilting the sunshade roof. However, there is no ventilation path in front or on the side of the air conditioner outdoor unit, and depending on the installation condition, there is a possibility that heat may accumulate between the air conditioner outdoor unit and the sunshade roof. Heat accumulation increases the power load of the air conditioner and reduces the energy saving efficiency.

[0008] The invention of Patent Document 2 has a certain space between the air conditioner outdoor unit and the sunshade cover, so this space may function as a ventilation passage. However, there is a possibility that heat may accumulate inside the support member. In addition, because the sunshade cover is horizontal, the impact of flying objects falling vertically is large, and there is a possibility that snow may accumulate.

[0009] Thus, when constructing a protective top plate on top of an air conditioner's outdoor unit, sufficient consideration is required to protect the air conditioner's outdoor unit while at the same time reducing the load on the air conditioner during operation and minimizing maintenance, in other words, to ensure stable operation of the air conditioner, etc. However, since there are no guidelines for constructing such a top plate, it is not easy to achieve both protection of the air conditioner's outdoor unit and stable operation at the same time. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Publication No. 11-159809 [Patent Document 2] JP 2013-249984 A Summary of the Invention [Problem to be solved by the invention]

[0011] The problem that the present invention aims to solve is to provide a method for constructing a protection system for an air conditioner outdoor unit that easily achieves both protection of the air conditioner outdoor unit and stable operation of the air conditioner.

[0012] The first invention is a method for constructing a protection system for an air conditioner outdoor unit that protects the air conditioner outdoor unit from freezing rain using a top plate and a stand that supports the top plate from a predetermined location on the bottom surface of the top plate, wherein the protection system for the air conditioner outdoor unit is constructed on the top of the housing of the air conditioner outdoor unit so as to satisfy the following requirements: a first requirement that the stand supports the top plate so that the upper surface of the top plate is inclined at a predetermined angle from the front to the back of the air conditioner outdoor unit with respect to the horizontal plane; a second requirement that the stand supports the top plate so that, when viewed from the front, there is a gap between the top surface of the air conditioner outdoor unit housing and the bottom surface of the top plate; a third requirement that the stand has a through hole in a side view; and a fourth requirement that, when viewed from the side, the top surface of the air conditioner outdoor unit housing is hidden by the top plate. Further, a second invention is a method for constructing a protection system for an air conditioner outdoor unit that protects the air conditioner outdoor unit from freezing rain using a top plate and a stand that supports the top plate from a predetermined location on the bottom surface of the top plate, wherein the protection system for the air conditioner outdoor unit is constructed on the top of the housing of the air conditioner outdoor unit so as to satisfy the following requirements: a first requirement that the stand supports the top plate so that the upper surface of the top plate is inclined at a predetermined angle from the front to the back of the air conditioner outdoor unit with respect to the horizontal plane; a second requirement that the stand supports the top plate so that, when viewed from the front, there is a gap between the upper surface of the housing of the air conditioner outdoor unit and the bottom surface of the top plate; a third requirement that the stand has a through hole in a side view; a fourth requirement that, when viewed from the side, the top surface of the housing of the air conditioner outdoor unit is hidden by the top plate; and a fifth requirement that the top plate has a hollow structure that penetrates at both ends. A third invention is a protection system for an air conditioner outdoor unit constructed on an upper part of a casing of the air conditioner outdoor unit by the construction method of the protection system for an air conditioner outdoor unit of the first or second invention.A fourth invention is a protection system for an air conditioner outdoor unit that protects the air conditioner outdoor unit from freezing rain by using a top plate and a stand that supports the top plate from a predetermined location on the bottom surface of the top plate, the stand supports the top plate so that the top surface of the top plate can be placed on top of the air conditioner outdoor unit at a predetermined inclination angle from the front to the back of the air conditioner outdoor unit with respect to the horizontal plane, the stand supports the top plate so that the stand can be seen in a front view, the stand has a through hole in a side view, the top plate has a larger area than the top surface of the housing of the air conditioner outdoor unit in a plan view, and the top plate has a hollow structure with holes through both ends.A fifth invention is the protection system for an air conditioner outdoor unit of the fourth invention, characterized in that the top surface of the top plate is coated with a heat insulating paint. Effect of the Invention

[0013] In constructing a protection system for an air conditioner outdoor unit, the present invention is expected to easily achieve both protection of the air conditioner outdoor unit and stable operation of the air conditioner by setting the requirements that the top surface of the top plate has a predetermined inclination angle, that there is a gap between the top surface of the air conditioner outdoor unit housing and the bottom surface of the top plate as an air passage, that there is a through hole in the stand, and that the top plate is large enough to protect the air conditioner outdoor unit. In addition, by having a hollow structure inside the top plate, the impact of external factors such as sunlight on the air conditioner outdoor unit can be reduced, and protection of the air conditioner outdoor unit and stable operation of the air conditioner can be expected. In addition, by applying a heat insulating coating to the top surface of the top plate, the present invention is expected to reduce the impact of external factors such as sunlight on the air conditioner outdoor unit, and protection of the air conditioner outdoor unit and stable operation of the air conditioner. [Brief description of the drawings]

[0014] [Figure 1] 1 is an example of an installation state of a protection system for an air conditioner outdoor unit. [Diagram 2] 1 is an example of a side view of an installation state of a protection system for an air conditioner outdoor unit. [Diagram 3] This is an example of the installation process for a protection system for an air conditioner outdoor unit. [Figure 4]1 is a front view of an example of an installation state of a protection system for an air conditioner outdoor unit. [Diagram 5] This is an enlarged view (right) of the protection system part of an air conditioner outdoor unit (the part circled in the left), along with a cross-section of one side taken along the center line from the top to the bottom as viewed from the front, and an image of the ventilation system. [Figure 6] This is an image of the ventilation in the front-to-back and left-to-right directions of an air conditioner outdoor unit. [Figure 7] These are the results of checking whether or not there is a protection system in the air conditioner outdoor unit and the surface temperature. [Figure 8] This is an enlarged photograph of a coating film formed by a heat insulating paint. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Example 1 The following are embodiments of the present invention. In this embodiment, an outdoor unit of an air conditioner installed on the roof of a building is the subject.

[0016] FIG. 1 shows an air conditioner outdoor unit protection system 1 (hereinafter referred to as the "protection system") installed on top of an air conditioner outdoor unit 2. The protection system 1 mainly consists of a top plate 3 and a stand 4 that supports the top plate 3. FIG. 2 is an example of a side view of the air conditioner outdoor unit 2 and the protection system 1. In the present invention, the three faces of the protection system 1, namely the front, side, and top, are the same as those of the air conditioner outdoor unit 2.

[0017] <Tabletop> The flat top plate 3 of the protection system 1 has a hollow structure with ventilation passages (air passages) 3a penetrating both ends. The top plate 3 is made of resin, but the material is not limited to this and may be made of metal or wood. The shape of the ventilation passage 3a is not limited to this and may be any cross-sectional shape such as triangular, rectangular, hexagonal, circular, etc.

[0018] <Stand> The stand 4 of the protection system 1 supports the top plate 3 from its bottom surface, and is installed on the upper surface of the housing of the air conditioner outdoor unit 2. The bottom surface of the stand 4 is in close contact with the upper surface of the housing of the air conditioner outdoor unit 2, and the upper surface of the stand 4 is in close contact with the bottom surface of the top plate 3, so that the top plate 3 is inclined at a certain angle with respect to the horizontal plane (the horizontal upper surface of the housing of the air conditioner outdoor unit 2).

[0019] In this embodiment, a through hole (hole) 4a is provided on the side of the stand 4. Like the hollow structure of the top plate 3, the hole 4a constitutes an air passage penetrating the left and right sides of the protection system 1, and serves to allow cross wind to pass when the protection system 1 is installed, preventing the occurrence of heat accumulation between the top plate 3 and the upper surface of the housing of the air conditioner outdoor unit 2. Here, the shape of the hole 4a is not limited, like the air passage 3a of the top plate 3. Also, the combined area of ​​these openings should be larger from the viewpoint of ventilation, and is preferably at least two-thirds of the area of ​​the side of the stand.

[0020] Moreover, the stand 4 is an important part in terms of durability against strong winds. In the present embodiment, the front and rear surfaces of the stand 4 are curved and face each other in a convex shape. The front surface of the stand 4 is curved so that it is farther away from the rear surface of the stand 4 as it goes up, and the rear surface is curved so that it is farther away from the front surface as it goes down. This structure has durability against wind pressure on the upper surface of the tabletop 3. In this embodiment, the stand 4 is made of resin, but the material is not limited and it may be made of metal or wood.

[0021] <Protection system installation> Below is an example of the installation of protection system 1. Following the steps shown from left to right in the photograph in Figure 3, a protection system 1 was constructed on top of the housing of an air conditioner outdoor unit 2 installed on the roof of a building.

[0022] As shown in Figure 3, the housing surface of the air conditioner outdoor unit 2 was cleaned (leftmost photo). If the housing surface is dirty, problems may occur with the installation of the protection system 1. Dirt on the top, sides, front, and back of the housing was removed by washing with water and using a brush.

[0023] Next, the top surface of the housing of the air conditioner outdoor unit 2 was painted (second photo from the left in Figure 3). This was a measure to keep the top surface of the housing of the air conditioner outdoor unit 2 clean. Painting makes the top surface of the housing of the air conditioner outdoor unit 2 smooth, reducing the accumulation of dust and the like. The painting was also done to improve adhesion between the top surface of the housing of the air conditioner outdoor unit 2 and the stand 4. However, this measure is not necessarily essential.

[0024] After the paint dried, the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the stand 4 were attached with double-sided tape (Aica Kogyo, Cellar special tape, adhesive strength N6.5) (third photo from the left in Figure 3). However, it is not necessary to fix these with double-sided tape, and screws, bands, adhesives, or other alternative means can also be used.

[0025] The stands 4 are installed at two positions, one on the left and one on the right, with a predetermined distance between them, on the top surface of the housing of the air conditioner outdoor unit 2. The distance is not limited, but for example, the stands 4 can be installed at two positions separated by a width ratio of 1:4:1 in the horizontal direction of the top surface of the housing of the air conditioner outdoor unit 2.

[0026] After the stand 4 is placed on the top surface of the housing of the air conditioner outdoor unit 2, the top surface of the stand 4 is aligned with the bottom surface of the top plate 3, and the top plate 3 is fixed to the stand 4 with screws at four equally spaced locations (photo at the right end of Fig. 3). However, this fixing method is not limited to this, and the above-mentioned double-sided tape or adhesive may also be used.

[0027] The structure of the top plate 3 and the stand 4 in the present invention, the fixed state, and the state in which the protection system 1 is installed on the top of the housing of the outdoor unit of an air conditioner satisfy the following requirements.

[0028] The stand 4 supports the top plate 3 so that the top surface of the top plate 3 is at a specified angle of inclination from the front to the back of the air conditioner outdoor unit 2 with respect to the horizontal plane. By installing the top surface of the top plate 3 at an incline in this way, it becomes possible to soften the impact of flying objects that fall vertically, such as hail, and to prevent the accumulation of snow and the like on the top surface of the top plate 3. If the surface of the top plate 3 is smooth, it is preferable that the inclination angle of the top surface of the top plate 3 is at least 7 degrees.

[0029] When viewed from the front of the air conditioner outdoor unit 2 and protection system 1 (as shown in FIG. 4), there is a gap 5 between the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the top plate 3 (in other words, at least a part of the stand 4 is visible when viewed from the front). FIG 4 is an example of a front view of the protection system 1 in an installed state. The gap 5 between the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the top plate 3 shown in this figure becomes an air passage.

[0030] Specifically, as shown by the arrows in the enlarged cross-sectional view of the protection system 1 in Fig. 5 (a cross-sectional view of one side taken along the vertical center line when viewed from the front of the protection system 1 excluding the air conditioner outdoor unit 2) (right side of Fig. 5), ventilation in the front-to-rear direction of the air conditioner outdoor unit 2 is possible. In this way, heat buildup between the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the top plate 3 can be prevented.

[0031] In a side view of the air conditioner outdoor unit 2 and the protection system 1 (as shown in FIG. 2), the stands 4 have holes 4a that communicate the spaces on both sides of the stands 4 and form an air passage. Here, FIG. 6 is an image diagram of ventilation in the front-back and left-right directions of the air conditioner outdoor unit 2.

[0032] As shown in the figure, the holes 4a of each frame 4 become ventilation paths in the left-right direction on the top surface of the housing of the air conditioner outdoor unit 2, making it possible to prevent heat buildup. The size and shape of the holes 4a are not limited, but the cross-sectional area of ​​the ventilation path should be at least a certain size to ensure sufficient ventilation. For example, the holes 4a are provided so that there is no significant bias in ventilation in the up-down and left-right directions on the side surface of the frame 4, and it is preferable that the opening area of ​​the holes as a whole is at least two-thirds of the area of ​​the side surface of the frame.

[0033] In a plan view (not shown) of the air conditioner outdoor unit 2 and protection system 1, the top surface of the housing of the air conditioner outdoor unit 2 is hidden by the top plate 3. The top plate 3 is large enough to cover the entire top surface of the housing of the air conditioner outdoor unit 2, making it possible to prevent flying objects such as hail from hitting the air conditioner outdoor unit 2 directly.

[0034] The top plate 3 has a hollow structure that penetrates both ends. This ensures two air layers: the gap (first air layer) 5 between the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the top plate 3, and the hollow structure (second air layer) 3a inside the top plate. Each air layer also serves as an air passage, diffusing heat, and as an insulating layer, it is possible to mitigate the effects of high temperatures in the summer caused by solar radiation on the air conditioner outdoor unit.

[0035] <Results and Discussion> As a result of various studies, it was confirmed that the protection system 1 constructed with the above-mentioned configuration and construction achieves both durability and the required functionality. First, in terms of durability, even one year after installation, no noticeable deterioration in appearance or deterioration in installation stability was confirmed.

[0036] It has been confirmed that the protection system 1 eliminates the heat pooling that sometimes occurred between the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the top plate 3 in the past. Figure 7 shows the results of infrared thermography in the summer on the surface temperature of the housing of the same air conditioner outdoor unit 2 (another air conditioner outdoor unit than the one in Figure 1). The left figure shows the results when the protection system 1 was not installed, and the right figure shows the results when the protection system 1 was installed.

[0037] From the surface temperature data obtained from Figure 7, it was confirmed that the surface temperature of the housing of the air conditioner outdoor unit 2 was on average 10°C lower or more when the protection system 1 was installed (details omitted). Here, it is known that heat pools are likely to occur between the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the top plate 3 when they are close to each other, at the level of a few millimeters, or when no ventilation path is provided.

[0038] One of the causes of heat buildup in such cases is that the heat generated by the heat exchanger inside the air conditioner outdoor unit 2 is difficult to disperse on the top surface of the housing. In contrast, the protection system 1 is designed to promote the diffusion of heat.

[0039] That is, when viewed from the front of the air conditioner outdoor unit 2 and the protection system 1, there is a gap 5 between the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the top plate 3, so ventilation from the front to the rear or from the rear to the front of the air conditioner outdoor unit 2 is not impeded. Ventilation is possible as shown by the arrows in Figure 5, allowing heat to be diffused.

[0040] In addition, in a side view of the air conditioner outdoor unit 2 and the protection system 1, the stands 4 have holes 4a that communicate the spaces on both sides of the stands 4 and form an air passage, so that ventilation from one of the left and right sides of the air conditioner outdoor unit 2 to the other is not impeded. Ventilation is possible as shown by the left and right arrows of the air conditioner outdoor unit 2 in Figure 6.

[0041] In addition to the above, since the top plate 3 has a predetermined inclination angle, in summer, warm air is more likely to diffuse along the inclination from the rear of the top plate 3 and the upper part of the hole 4a in the frame 4. And, as it goes further to the rear of the air conditioner outdoor unit 2, the opening area of ​​the hole 4a in the side of the frame 4 gradually increases in accordance with the gap 5 that increases due to the inclination of the top plate 3, promoting the diffusion of heat.

[0042] Another factor that causes hot spots is that the top plate 3 transmits the effects of the external environment to the air conditioner outdoor unit 2. The top plate 3 is prone to becoming hot due to sunlight in the summer and to becoming cold due to snow in the winter. These effects place a strain on the heat exchanger inside the air conditioner outdoor unit 2.

[0043] The top plate 3 of this embodiment has a hollow structure with ventilation passages 3a that penetrate the inside at both ends, making it difficult for external environment such as sunlight and snow to be transmitted to the air conditioner outdoor unit 2. This is because two air layers, a first air layer and a second air layer, are formed between the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the top plate 3, and inside the top plate 3, enhancing effects such as heat insulation.

[0044] In this embodiment, the tabletop 3 has a hollow structure with an interior that is perforated on both the left and right ends. This is because the aim is for the interior of the tabletop 3 to act as an air passage to diffuse heat. However, if the desired heat insulating effect can be obtained by the air layer inside the tabletop 3, the interior of the tabletop 3 does not necessarily need to be perforated.

[0045] In this way, when the protection system 1 is installed, with two air layers and a specific structure that diffuses heat, the temperature of the top surface of the housing of the air conditioner outdoor unit 2 becomes lower in summer than before the system was installed. The effect of reducing power consumption by lowering the temperature of the top surface of the housing was confirmed by additional tests using cold water.

[0046] That is, a comparative test was conducted between the power consumption when the surface of the housing of the air conditioner outdoor unit 2 was controlled to a specified temperature by contact with a cold water pipe through which cold water flows, and the power consumption before temperature control. Although details are omitted, the surface (top) of the housing of the air conditioner outdoor unit 2 was 36°C before temperature control by cooling, and 29°C after temperature control. The power consumption was an average of 2.55kW before temperature control by cooling, and an average of 2.10kW after temperature control, and it was confirmed that the power reduction rate due to the lower surface temperature of the housing of the air conditioner outdoor unit 2 was 17.6%.

[0047] The above additional test suggests that by controlling the surface temperature of the housing of the air conditioner outdoor unit 2 to be low in summer, the load on the heat exchanger in the air conditioner outdoor unit 2 is reduced, and power consumption is reduced. In this embodiment, the surface temperature of the housing of the air conditioner outdoor unit 2 was reduced by an average of 10°C or more in summer. In other words, it was confirmed that the protection system 1 is useful for improving the efficiency and stabilizing the operation of the air conditioner outdoor unit 2.

[0048] The smaller the inclination angle of the top plate 3, the closer it is to a horizontal state, and when there is a small gap between the top surface of the housing of the air conditioner outdoor unit 2 and the bottom surface of the top plate 3, heat pools are more likely to occur. However, the greater the inclination angle of the top plate 3, the larger the area required to cover the top surface of the housing of the air conditioner outdoor unit 2, making it more susceptible to the effects of wind gusts and the like. In light of this, the inclination angle of the top plate 3 in an environment where there are no other structures apart from the air conditioner outdoor unit 2, such as the rooftop of a building, is preferably in the range of, for example, 7 degrees to 10 degrees.

[0049] The size of the top plate 3 is required to be at least large enough to hide the top surface of the housing of the air conditioner outdoor unit 2 when viewed in a plan view of the air conditioner outdoor unit 2 and the protection system 1. Since hail falls almost vertically, the air conditioner outdoor unit 2 can be protected if the area of ​​the top surface of the top plate 3 is at this level.

[0050] The upper surface of the tabletop 3 may be heat-insulated by applying a heat-insulating paint or the like. When a heat-insulating paint is applied to the upper surface of the tabletop 3 to form a heat-insulating coating film, the effects of high temperatures due to sunlight in summer and low temperatures due to snow in winter can be reduced.

[0051] The following heat insulating coating was confirmed to have a desired heat insulating effect. That is, a coating film forming material containing soft acrylic hollow beads and hard ceramic hollow beads, each with a particle size of several tens of μm, was applied to the surface of the housing of the air conditioner outdoor unit 2, and the effect of the heat insulating coating film with a thickness of 200 to 400 μm formed after drying was confirmed. Figure 8 is an example of a magnified photograph of the coating film.

[0052] As shown in Figure 8, soft acrylic hollow beads and hard ceramic hollow beads are densely packed in the coating film, forming a heat insulating layer. Also, although not visible in Figure 8, ceramic hollow bead fragments (grain size less than 1 μm) are present on the surface of the coating film, contributing to improving the solar reflectance (for example, contributing to achieving a reflectance of 80% or more). The fragments are mixed into the coating film forming material and are pushed out to the surface of the coating film as the water evaporates as the coating film dries.

[0053] In this way, it was confirmed that the power consumption of the air conditioner was reduced after the coating was applied compared to before the coating. In other words, by forming a coating film with the insulating paint on the upper surface of the top plate 3 of the protection system 1, it becomes possible to reduce the thermal load caused by external factors such as sunlight. Applying the insulating paint to the top plate 3 is particularly useful in the case of top plate materials with high thermal conductivity.

[0054] A specific example of an insulated tabletop is a tabletop having a coating surface layer on the top surface in which soft acrylic hollow beads and hard ceramic hollow beads become dense when dried to form a specified film thickness (e.g., 200 μm or more), and fine ceramic powder acts as a reflective layer with a specified reflectance (e.g., 80% or more).

[0055] The dense layer formed by these soft and hard hollow beads has elasticity, and not only provides insulation but also cushions against the impact of hail, etc. In addition, because the material forming the reflective layer is the same as that of the hollow beads, it is possible to utilize the fine powder generated during the manufacturing process of the hollow beads, which saves labor and makes it possible to easily construct a tabletop that contributes to the stable operation of air conditioners. [Industrial Applicability]

[0056] INDUSTRIAL APPLICABILITY The present invention can be used to build a system for protecting an outdoor unit of an air conditioner from hail and the like while enhancing the effects of saving energy and electricity. [Explanation of symbols]

[0057] 1. Protection System 3. Tabletop 3a Ventilation duct (ventilation duct) 4 Mounting 4a Through hole (hole) 5 Gap

Claims

1. A method for constructing a protection system for an air conditioner outdoor unit that protects the air conditioner outdoor unit from freezing rain using a top plate and a stand that supports the top plate from a predetermined location on a bottom surface of the top plate, A first requirement is that the frame supports the top plate so that an upper surface of the top plate has a predetermined inclination angle from the front to the back of the air conditioner outdoor unit with respect to a horizontal plane; A second requirement is that the stand supports the top plate so that there is a gap between an upper surface of the housing of the air conditioner outdoor unit and a bottom surface of the top plate when viewed from the front; A third requirement that the base has a through hole in a side view; A fourth requirement that, in a plan view, an upper surface of a housing of the air conditioner outdoor unit is hidden by the top plate; A method for constructing a protection system for an air conditioner outdoor unit, the method comprising: constructing a protection system for the air conditioner outdoor unit on an upper portion of a housing of the air conditioner outdoor unit so as to satisfy the above-mentioned requirements.

2. A method for constructing a protection system for an air conditioner outdoor unit that protects the air conditioner outdoor unit from freezing rain using a top plate and a stand that supports the top plate from a predetermined location on a bottom surface of the top plate, A first requirement is that the frame supports the top plate so that an upper surface of the top plate has a predetermined inclination angle from the front to the back of the air conditioner outdoor unit with respect to a horizontal plane; A second requirement is that the stand supports the top plate so that there is a gap between an upper surface of the housing of the air conditioner outdoor unit and a bottom surface of the top plate when viewed from the front; A third requirement that the base has a through hole in a side view; A fourth requirement that, in a plan view, an upper surface of a housing of the air conditioner outdoor unit is hidden by the top plate; The fifth requirement is that the top plate has a hollow structure penetrating both ends; A method for constructing a protection system for an air conditioner outdoor unit, the method comprising: constructing a protection system for the air conditioner outdoor unit on an upper portion of a housing of the air conditioner outdoor unit so as to satisfy the above-mentioned requirements.

3. 3. A protection system for an air conditioner outdoor unit constructed on an upper portion of a housing of the air conditioner outdoor unit by the method for constructing a protection system for an air conditioner outdoor unit according to claim 1 or 2.

4. A protection system for an air conditioner outdoor unit that protects the air conditioner outdoor unit from freezing rain by a top plate and a stand that supports the top plate from a predetermined location on a bottom surface of the top plate, the stand supports the top plate so that the top surface of the top plate can be installed on the top of the air conditioner outdoor unit at a predetermined inclination angle from the front to the back of the air conditioner outdoor unit with respect to a horizontal plane; The stand supports the top plate so that the stand can be seen in a front view, When viewed from the side, the base has a through hole, In a plan view, the top plate has a larger area than the upper surface of the housing of the air conditioner outdoor unit, A protection system for an air conditioner outdoor unit, wherein the top plate has a hollow structure with through holes on both ends.

5. 5. The protection system for an air conditioner outdoor unit according to claim 4, wherein an upper surface of the top plate is coated with a heat insulating paint.

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