JP2002061964A - Solar system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar system which is excellent in warm keeping property and can sharply enhance the energy efficiency, and besides is small and lightweight. SOLUTION: This solar system possesses a heat collector which has a container body 1 where water circulates and a casing 2 surrounding it, and a heat insulating sheet of a thin film is used for a heat insulating layer 3 provided between the container body 1 and the casing 2. Since the heat radiated outside through the casing 2 is checked, the system is excellent in warm keeping property, and can sharply enhance the energy efficiency, and besides can be downsized smaller than conventional one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar system using a liquid heated and kept warm by solar energy.

[0002]

2. Description of the Related Art Conventionally, in general houses, buildings and other various buildings, various devices have been installed and used for cooling and heating the room and air conditioning. On the other hand, the operation and maintenance of such equipment requires electricity and other energy, and in order to save energy, solar energy is used as it is as a heat source or converted into electricity. ing.

[0003] As one of the typical ones, a heat collector is installed on the roof or the roof of a building, and water heated by solar energy is stored in a heat storage tank installed on the ground, and is used for central hot water supply and heating. There is a solar system designed to do this.
The heat collector in this solar system basically has a configuration in which the container body in which water circulates is covered with an outer box,
In order to make effective use of solar energy or to not unnecessarily apply heat to the roof, a container whose main body is insulated with a heat insulating material such as glass wool is used. Specifically, a space between the inner surface of the outer box and the outer surface of the container body is
A heat insulating layer made of glass wool, rock wool, or the like having a thickness of about 20 mm is formed.

[0004]

In a conventional solar system, glass wool or rock wool having a high heat-resistant temperature is used as a heat insulating material because the surface temperature due to sunlight is very high. However, the thermal insulation of these materials
Insulation performance is not so good as compared to insulation materials made of a foaming agent, and dew condensation occurs during heat retention, and the dew condensation water accumulates in gaps between glass wool and rock wool, further deteriorating the heat insulation performance. was there. Further, the thickness of the heat insulating layer was as large as 15 to 20 mm, which hindered the reduction in size and weight of the solar system. Narrow the width of this insulation layer,
The use of a foaming agent can be considered to reduce the weight, but the foaming agent has insufficient moisture resistance and heat resistance, and has a problem of deterioration over time.

The present invention has been made in view of such problems, and an object of the present invention is to prevent heat radiated to the outside through an outer box so as to have excellent heat insulation and energy. An object of the present invention is to provide a small and lightweight solar system which can greatly improve efficiency.

[0006]

In order to achieve the above object, a solar system according to the present invention comprises a heat collector having a container body through which water circulates and an outer box surrounding the container body. It is characterized in that a thin heat insulating sheet is used for a heat insulating layer provided between the outer box.

[0007] Further, in the solar system having the above configuration, the heat insulating sheet is characterized in that at least a part of the impregnating base material is impregnated with a resin composition containing hollow particles and / or air bubbles.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a solar collector according to the present invention in a partially broken state. 2 is a partial cross-sectional view of the bottom of the heat collector of FIG.

[0009] The heat collector is installed on the roof of the building,
As shown in the figure, a container body 1 as a heat collecting part through which water circulates
And an outer box 2 surrounding the container body 1.
A thin heat insulating sheet 3 is provided between the outer case 2 and the outer case 2. The upper surface of the container body 1 is covered with a transparent plate 4 to protect the container body 1 and at the same time protect the container body 1 from sunlight.
Can be transmitted through.

The heat collector is provided with a water supply section 5 adjacent to the container body 1.
And a hot water storage section 6, which are connected to the container body 1 by connecting pipes 7 and 8, respectively. The water supply unit 5 temporarily stores tap water from the water supply pipe 9 and supplies the stored water to the container body 1 through the connection pipe 7, and can always store a fixed amount of water by the ball tap 10. . Hot water storage section 6 is a hot water storage tank 1 surrounded by a heat insulating material 11.
2 is built in, and the water warmed in the container body 1 is sent through the tapping pipe 13 to a heat storage tank (not shown) once. In the figure, reference numeral 14 denotes a drain pipe provided at the end of the container body 1 so as to penetrate the outer box 2.

In this heat collector, a pipe is provided between a heat storage tank installed on the ground, and when the heat collector reaches a certain temperature or higher due to solar heat, the pump is automatically operated and installed on the ground. Store hot water in the heat storage tank. At this time, since the thin foamed heat insulating sheet 3 is provided as a heat insulating layer between the container body 1 and the outer box 2 in the heat collector, heat is prevented from being radiated to the outside through the outer box 2. Therefore, the energy efficiency can be greatly improved, and the portion to be installed on the roof by the solar system can be made small and lightweight.

In the above example, a thin heat insulating sheet is provided between the container body and the outer box. However, in order to further enhance the heat insulating effect, a similar thin heat insulating sheet is provided on the outer surface of the outer box. The sheet may be attached. In this case, a decorative sheet may be used as the heat insulating sheet to be attached to the outer side of the outer box.

FIG. 3 is a cross-sectional view showing an example of an impregnated type heat insulating sheet. The heat insulating sheet 20 shown in FIG. 3 (A) is a polymer matrix 21 in which a resin composition containing hollow particles 22 is impregnated. The material 24 impregnated with the heat insulating sheet 20 shown in FIG.
The heat insulating sheet 20 shown in FIG. 3C is obtained by impregnating the impregnating base material 24 with the resin composition including the hollow particles 22 and the air bubbles 23 in the polymer matrix 21. The impregnated base material 24 is impregnated.

In the impregnation type, partial impregnation (impregnation to a part in the thickness direction) of one side of the impregnable base material 24 that does not reach the other side is performed, and the unimpregnated base material 24 is not impregnated near the other side. May remain, and the adhesive easily penetrates into the unimpregnated portion, so that the adhesiveness can be improved.

A single sheet made of a resin composition containing hollow particles and / or air bubbles is obtained by removing the impregnating substrate 24 from the impregnating type shown in FIG. The material obtained by removing the material 24 and laminating the base material on one side corresponds to a lamination type.

A form in which a coating layer is laminated on the heat insulating sheet 20 can also be adopted. FIG. 4 shows an example in which a coating layer is laminated on the heat insulating sheet 20, FIG. 4 (A) shows an example in which the coating layer 25 is laminated on one side of the heat insulating sheet 20, and FIG. 20 shows an example in which a coating layer 25 is laminated on both surfaces of the substrate 20. By laminating the coating layer 25, the surface of the heat insulating sheet 20 is smoothed, the adhesive, coloring and printing are improved, and depending on the material, the strength of the heat insulating sheet surface is improved or the heat insulating property is improved. It is possible to suppress the hygroscopicity of the sheet.

The hollow particles include organic ones made of an acrylic resin such as acryl and acrylonitrile and synthetic resins such as polystyrene resin, and inorganic ones made mainly of silica and alumina. as,
Something like a volcanic shirasu balloon can also be used. Further, hydrophilic or hydrophobic hollow particles described later can also be used.

A microcapsule type foaming agent, which is a kind of a foaming agent for generating air bubbles, may be used which has been foamed in advance. Things can also be treated as hollow particles. Examples of foamed microcapsule-type foaming agents include hollow particles manufactured by Matsumoto Yushi Seiyaku Co., Ltd. (product number "F-8").
0ED "or" F-80E ") has a density of 0.0
Since it is as small as 2 g / cm ³ , it is effective in suppressing thermal conductivity, and is preferably used.

The particle size of hollow particles which can be generally obtained and used is in the range of 0.3 to 300 μm, and one or more of them are selected from these.

Although the hollow particles themselves are relatively strong, they can withstand external forces such as compression.
In particular, when dispersed in a synthetic resin emulsion-based coating composition, air bubbles easily enter the coating composition by a stirring operation.

Since bubbles are useful for improving heat insulation, bubbles are intentionally generated, or bubbles are generated by using a chemical foaming agent such as a microcapsule type or a decomposition type to generate bubbles. Good. Insulation can be provided only by bubbles without hollow particles.

A heat insulating sheet is prepared and used by using either hollow particles or air bubbles, or a heat insulating sheet is prepared by using hollow particles and air bubbles dispersed in a synthetic resin coating composition. When used, the hollow particles and / or the collapse of the air bubbles tend to reduce the heat insulating property over time. Therefore, in order to improve the compression resistance of the heat insulating sheet, the following three types of hollow particles are selected. It is preferable to carry out in the following manner. (1) A blend of hollow particles having different particle sizes. (2) A blend of hydrophilic hollow particles with hydrophobic hollow particles. (3) Blend of hydrophilic hollow particles and hydrophobic hollow particles having different particle diameters.

In order to fill the small hollow particles between the large hollow particles in the blend of the hollow particles having different particle diameters in the above (1), the diameter a of the large hollow particles and the diameter b of the small hollow particles are required. Is b ≧ a (2−3 ^1/2 ) / 3
It is ^1/2 , and when this is calculated, b ≧ 0.155a. In the case of body-centered cubic, which is the sparsest filling, b
= A (2-2 ^1/2) / 2 ^1/2, is calculated this, it is b = 0.414a. Therefore, 0.155
a ≦ b ≦ 0.414a, and the diameter b of the hollow particles to be blended with the hollow particles having the diameter a is defined.

Incidentally, in the case of the densest hexagonal close packing,
In order for the hollow particles having the diameter b to just enter the gaps of the hollow particles having the diameter a without any gap, b = 2a (11/3)
^1/2 / 3, calculating this, b = 0.277a
It is.

As described above, since the particle size of the available hollow particles is in the range of 0.3 to 300 μm, a combination of large and small hollow particles satisfying the above relationship is selected from the above. use.

In the above, the relationship between the number N (a) of particles per unit of the hollow particles having the diameter a and the number N (b) of the voids accommodated by the hollow particles having the diameter b is as follows.
(B) / N (a) = 8: 6. In the case of body-centered cubic, N
(B) / N (a) = 4: 2. To sort this out,
1/2 ≦ N (a) / N (b) ≦ 3/4, and the weight ratio at the time of blending the hollow particles of each diameter is determined by the number of hollow particles after determining the degree of packing density. The ratio is determined by calculation from the specific gravity and particle size of each hollow particle.

The above heat-insulating sheet prepared by blending the hollow particles having different particle diameters (1) under such conditions and dispersing them in a polymer matrix has a small diameter in a portion having bubbles. Since the hollow particles having the larger diameter are filled between the hollow particles having the larger diameter and reinforced, the compression resistance is enhanced and the structure is less likely to be crushed.

In the blend of the hydrophilic hollow particles and the hydrophobic hollow particles of the above (2), since the hydrophobic hollow particles have higher hydrophilicity with air, they are added to the coating composition during dispersion. The entrapped air bubbles are surrounded by hydrophobic hollow particles to form secondary particles having a hydrophobic outside, and the heat insulating sheet is dispersed between the hydrophilic hollow particles and the hydrophilic resin.

Here, the hydrophilic hollow particles are made of a material
It is made of glass, silica, silica-alumina, ceramic, shirasu, hollow plastic, hollow fiber, or the like. As the hydrophobic hollow particles, those obtained by subjecting these hydrophilic particles to a hydrophobic treatment are used. is there. The mixing ratio between the hydrophilic hollow particles and the hydrophobic hollow particles is determined by calculation from the size of the bubbles to be formed, the particle diameter of each hollow particle, and the specific gravity.

The blend of the hydrophilic hollow particles and the hydrophobic hollow particles having different particle diameters in the above (3) is a combination of the means of the above-mentioned methods (1) and (2), and is a mixture of the hydrophobic hollow particles having a small particle diameter. A heat insulating sheet having a structure having air bubbles between hollow particles in which conductive particles and hollow particles having a large particle diameter are mixed is obtained.
In this method, since hydrophobic particles having a small particle size are filled between hollow particles having a large particle size, the walls of bubbles formed between the hollow particles are strengthened, and a heat insulating sheet having a structure that is not easily crushed is obtained. Can be

As the polymer matrix, the following resins can be used. For example, nitrocellulose,
Cellulose acetate, cellulose butyl acetate, ethyl cellulose, polyamide resin, chlorinated rubber, cyclized rubber, polyamide resin, polyvinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin, ethylene / vinyl acetate copolymer resin, chlorinated polypropylene, or acrylic Organic solvent solution of thermoplastic resin such as resin, urea resin, melamine resin, phenol resin, resorcinol resin, furan resin, epoxy resin, unsaturated polyester resin, polyurethane resin, polyimide, polyamide imide, polybenzimidazole,
It is a thermosetting resin such as polybenzothiazole or a polyurethane resin, and these resins can be a resin solution dissolved in water or an organic solvent.

Alternatively, styrene malee resin, polyvinyl acetate resin, acrylic resin, or urethane emulsion, or natural rubber, recycled rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, polysulfide rubber , Silicone rubber, polyurethane rubber, stereo rubber (synthetic natural rubber), ethylene propylene rubber, or block copolymer rubber (SBS, SIS, SEBS)
And the like, and these resins can be used as an organic solvent solution or a latex.

In order to form bubbles, a gas, particularly an inert gas, preferably a gas having a low thermal conductivity, is mechanically incorporated into a coating composition, impregnated into an impregnable substrate, and foamed by heating. In some cases, a chemical foaming agent comprising an organic compound as described below is blended into a coating composition, impregnated, and foamed by heating.

The term "blowing agent" generally refers to a chemical foaming agent of a decomposable type or the like in many cases. Available.

As the chemical foaming agent, azidicarbonamide, avizosisobutyronitrile, barium azodicarboxylate, or an azimic foaming agent such as p-toluenesulfonyl semicarbazide; benzenesulfonyl hydrazide; p-toluenesulfonyl hydrazide; Examples include sulfonyl hydrazide such as 4,4'-oxybisbenzenesulfonyl hydrazide, nitroso such as dinitrosopentamethylenetetramine, sodium bicarbonate, and ammonium bicarbonate.

From the viewpoint of the action of the foaming agent, a microcapsule type foaming agent having a low boiling point hydrocarbon such as isobutane or neopentane in the outer wall made of acrylonitrile resin or the like is similar to a mechanical gas bubble. Suitable for foaming at relatively low temperatures. When a chemical foaming agent is used, a foaming aid for lowering the foaming temperature to facilitate foaming may be used, if necessary. Examples of such microcapsule type foaming agents include foaming agents manufactured by Matsumoto Yushi Seiyaku Co., Ltd. (product numbers “F-46” and “F-5”).
0 "," F-55 "," F-80 ", or" F-8 "
5 ") can be used, and these have a foaming ratio of 20 times or more, and are preferable.

When the coating composition using these foaming agents is applied or impregnated to an impregnable substrate and foamed by heating, the thickness is preferably 0.1 to 100 times the film thickness after drying. Preferably, when the ratio is less than 0.1 times, the effect of improving the heat insulating property by foaming is poor, and when it exceeds 100 times, although the heat insulating property is provided, the compressive strength is lowered and the material is easily crushed.

As the impregnating base material, felts, nonwoven fabrics, cloths made from fibers such as natural fibers, synthetic fibers, rock wool, glass fibers, carbon fibers, and the like, or papers made from these fibers are used. Paper (especially low-density paper) or a sheet such as a ceramic sheet,
One of these single-layer sheets, two of the same
A composite sheet of the same kind of sheets, in which two or more sheets are laminated, or a composite sheet of different kinds of sheets, in which two or more arbitrary different sheets selected from these sheets are laminated, can be used. One side may be a sheet having no or poor impregnation, for example, a low moisture permeable sheet or the like may be laminated. The low moisture permeable sheet may be a decorative sheet provided with a design property, and this decorative sheet may be a single layer or a laminate composed of two or more layers.

Originally, felt was made by collecting animal hair, entangled by pressurizing while heating and humidifying, and forming a sheet. At present, in addition to natural fibers, synthetic fibers, rock wool, and carbon are used as raw materials. Fibers are also used. Non-woven fabric
Fibers (natural fibers are also treated, but usually synthetic fibers) are directly spun without mechanical spinning by mechanical, thermal, or chemical means into sheets. The paper is manufactured by entanglement of plant fibers and other fibers and agglutination (as defined by JIS).

As is clear from these definitions,
Felts, nonwovens, and paper, while seemingly different from each other in typical products, are essentially indistinguishable from each other. Are different in that

As papers, thin paper, kraft paper, titanium paper, resin-impregnated paper, linter paper, paperboard, gypsum board base paper, Japanese paper and the like can be used. More preferred ultra-low density paper is
Density 0.1 to 0.5 g / cm ³ is common, is of the order of 0.2 g / cm ³ as an example.

When felts, non-woven fabrics and cloths are included, the density is 0.01 to 1 g / cm ³ , preferably 0.1 to 1 g / cm ³ .
02 to 0.5 g / cm ³ , more preferably 0.02 to 0.5 g / cm ³
0.25 g / cm ³ . If it is less than the lower limit, the strength will be low, and the risk of damage during handling will increase. If it exceeds the upper limit, the heat insulation will be insufficient.

As for the fabric, it is preferable to use a heat-insulating fiber such as a hollow fiber as the fiber, but it is not always necessary to use a normal fiber which is not a heat-insulating fiber such as a hollow fiber. Any coarse cloth can be used.

Ceramics are mainly used as a heat insulating material in a high temperature region where heat resistance is required. Usually, the ceramic used here is a sintered compact having low thermal conductivity such as calcium silicate. A ceramic sheet is a sheet made by processing such ceramics into a fibrous shape.
Products of various thicknesses are also commercially available. The density of the ceramic sheet is preferably 0.8 to 2.3 g / cm ³ , and the thickness thereof is preferably about 0.2 to 5.0 mm.

In the above, the fibers are cotton,
Hemp, or natural fibers such as wool alone or two or more different, or synthetic fibers such as rayon, nylon, polyester, or acrylic alone or two or more different, rock wool, glass fiber, carbon fiber,
Potassium titanate fiber, alumina fiber, silica fiber or the like can be used. In the case of paper, vegetable fiber pulp is mainly used. The material constituting the ceramic sheet is not limited to silicate, which is a ceramic in a narrow sense, and alumina, silica, or zirconia alone or two or more different materials can be used.

In order to manufacture a heat insulating sheet using the above materials, a resin constituting a polymer matrix,
Preferably an aqueous solution of the resin, or an organic solvent solution,
Alternatively, the emulsion is mixed with hollow particles and / or a foaming agent, and various additives that can be blended as necessary, to prepare a coating composition and form a sheet. As a method for forming a sheet, a casting method in which the composition is applied to a peelable substrate and then dried and then peeled off, a method in which the composition is applied to the substrate to form a product with the substrate adhered, a method in which the impregnable substrate is impregnated and dried, and the like are used. .

The impregnation can be carried out by dipping the impregnating substrate in a tank filled with the impregnating coating composition (so-called dipping) or by using a known coating means from one or both sides of the impregnating substrate. Apply. After the impregnating paint has sufficiently penetrated, the excess impregnating paint is scraped off by a suitable scraping device or a removing device, for example, a suction doctor, a doctor roll, or a wire bar having a round rod wound with a wire. Alternatively, the impregnating base material is impregnated with a predetermined amount of the impregnating paint by removing the impregnating paint. Thereafter, by drying, a heat insulating sheet is obtained.

By adjusting the viscosity of the impregnating coating composition and the time from application to drying, it is possible to impregnate a part of the thickness. In this case, the unimpregnated portion of the other surface can be used. In addition, the adhesive can be penetrated to improve the adhesiveness.

Depending on the material constituting the coating composition for impregnation, particularly the material of the polymer matrix, the material is once dried at a relatively low temperature and then dried at a relatively high temperature, or a part or all of the drying is performed. The irradiation may be performed by ultraviolet irradiation or electron beam irradiation.

A heat insulating sheet (including a composite having a coating layer) can exhibit heat insulating properties even as it is, but is used for a long time or in a place where people or objects are likely to come into contact. Has a low strength, and there is a lot of risk that the heat insulating material may be damaged, stained, or absorb moisture to deteriorate the heat insulating property. For this reason, it is preferable to coat one or both surfaces of the heat-insulating sheet with another appropriate sheet for coating. Specifically, it is preferable to use a low moisture-permeable sheet that does not allow moisture to pass through. The low moisture permeable sheet may be a decorative sheet provided with a design property.

FIGS. 5 and 6 are explanatory views showing an example in which a low moisture-permeable sheet is laminated on a heat-insulating sheet previously coated on one or both sides with a coating layer.

FIG. 5A shows an example in which one surface of the heat insulating sheet 20 is covered with the coating layer 25, and the low moisture permeable sheet 26 is laminated on the side not covered with the coating layer 25. This structure is suitable for the case where the covering layer 25 is laminated as a base material when the heat insulating sheet 20 is manufactured, and the covering layer 25 can also have low moisture permeability. Of course, depending on the application, the low moisture permeable sheet 26 may be laminated on one side of the coating layer 25 so that one surface of the heat insulating sheet 20 can be exposed without the coating layer.

FIG. 5B shows an example in which a low moisture permeable sheet 26 is laminated on both sides of a heat insulating sheet 20 one side of which is covered with a coating layer 25. This structure is suitable for the case where the coating layer 25 is laminated as a base material when the heat insulating sheet 20 is manufactured, and when the coating layer 25 is not sufficient in strength and moisture absorption. .

FIG. 6A shows an example in which a low moisture permeable sheet 26 is laminated on one surface of a heat insulating sheet 20 having both surfaces covered with a coating layer 25. FIG. 6B shows an example in which a low moisture permeable sheet 26 is laminated on both sides of a heat insulating sheet 20 whose both sides are covered with a coating layer 25.

When a low moisture permeable sheet is laminated on both sides of the heat insulating sheet, the ends of the low moisture permeable sheet are heat-sealed or adhered to each other to form the heat insulating sheet into two low moisture permeable sheets. It is preferable that the sealing be performed in order to prevent moisture from entering from the end face. In this case, the coating layer can be substituted for one of the low moisture permeable sheets.

The low-moisture-permeable sheet suppresses or substantially eliminates moisture permeation to the adjacent heat-insulating sheet, and prevents the heat-insulating sheet from deteriorating the heat insulating property due to, for example, absorbing moisture. Things.

The lamination of the low moisture permeable sheet and the heat insulating sheet is performed by using an adhesive or by heat sealing. However, when the low-moisture-permeable sheet is disposed on both the front and back surfaces of the heat-insulating sheet and the end faces of the low-moisture-permeable sheet are sealed, the low-moisture-permeable sheet and the heat-insulating sheet may not be bonded.

In general, even if a low moisture permeable sheet is laminated, the end face of the heat insulating sheet is exposed to the air. Therefore, when moisture absorption from the end face becomes a problem, a resin paint is applied to the end face. Alternatively, the material may be sealed by melting the material with a flame.

As a material of the low moisture permeable sheet, for example,
Plastic films are preferred, and plastics include polyethylene resin, polypropylene resin, polymethylpentene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl alcohol resin, and vinyl chloride resin.
Vinyl acetate copolymer resin, ethylene-vinyl acetate copolymer resin, ethylene-vinyl alcohol copolymer resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate-isophthalate copolymer resin, polymethyl methacrylate resin, polymethacrylic Ethyl acid resin, polybutyl acrylate resin, nylon 6
Or a polyamide resin such as nylon 66, a cellulose triacetate resin, a cellophane, a polystyrene resin, a polycarbonate resin, a polyarylate resin, or a polyimide resin.

On the low moisture permeable sheet, another paint prepared using a resin binder such as polyvinylidene chloride resin having low moisture permeability is applied, or a thin film of metal or metal oxide is formed to reduce gas permeation. It is better to suppress it. In these metal thin films, a mixture of metal oxides having different oxidation numbers such as silicon monoxide and silicon dioxide,
A mixture of a silicon compound and an aluminum oxide may be used, or a mixture of an organic group mainly composed of an inorganic oxide may be used.

As a method of forming a thin film, for example, a vacuum vapor deposition method such as an ion beam method or an electron beam method, a physical vapor deposition method such as a sputtering method, a plasma chemical vapor deposition method, or a thermal chemical vapor deposition method Or a chemical vapor deposition method such as a photochemical vapor deposition method.

The thickness of the thin film is preferably 50 to 300
0 °, more preferably 100 to 1000 °. If it is less than 50 °, there is almost no effect of suppressing gas permeation, and if it exceeds 3000 °, cracks may occur in the thin film and gas permeability may be reduced, and the material cost is relatively high. Although it is slightly disadvantageous from the viewpoint of thermal conductivity, from the viewpoint of preventing the heat insulating sheet from absorbing moisture,
A low-moisture sheet may be used by laminating a metal foil or forming a coating film of a paint using a resin similar to the synthetic resin constituting the synthetic resin sheet as a binder.

Further, the heat insulating sheet of the thin film used in the present invention has sound absorbing and vibration damping properties because the heat insulating sheet contains hollow particles and / or air bubbles. The sound of the roof is reduced even when the module is activated or in rainy weather.

[0064]

Since the present invention is configured as described above, the following effects can be obtained.

In the present invention, since a thin heat insulating sheet is used for the heat insulating layer provided between the container body in which water circulates and the outer box surrounding it, heat radiated to the outside through the outer box is used. Is excellent in heat insulation and can greatly improve energy efficiency. Moreover, the device can be made smaller and lighter than before, and the reduction in size and weight reduces transportation costs. It can contribute to reduction and simplification of installation work, and can further promote energy saving.

In addition, by using a thin heat insulating sheet as the heat insulating layer, it can be easily adhered to the shape of the part requiring heat insulation, and the workability of attaching the heat insulating material is greatly improved. Can be.

By using a heat insulating sheet in which at least a part of an impregnating substrate is impregnated with a resin composition containing hollow particles and / or air bubbles, the heat insulating sheet has good heat insulating properties, unlike glass wool or the like. There is no need to worry about low water absorption and the accumulation of dew.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a heat collector of a solar system according to the present invention in a partially broken state.

FIG. 2 is a partial cross-sectional view of a bottom portion of the heat collector of FIG.

FIG. 3 is a sectional view of a heat insulating sheet.

FIG. 4 is a cross-sectional view of a heat insulating sheet on which a coating layer is laminated.

FIG. 5 is a cross-sectional view showing an example in which a low moisture-permeable sheet is laminated on a heat-insulating sheet covered on one side with a coating layer.

FIG. 6 is a cross-sectional view showing an example in which a low moisture-permeable sheet is laminated on a heat-insulating sheet covered on one side with a coating layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Outer box 3 Insulating sheet 4 Transparent plate 5 Water supply part 6 Hot water storage part 7,8 Connection pipe 9 Water supply pipe 10 Ball tap 11 Heat insulation material 12 Hot water storage tank 13 Hot water pipe 14 Drainage pipe 20 Heat insulation sheet 21 Polymer matrix 22 Hollow particles 23 Bubbles 24 Impregnating base material 25 Coating layer 26 Low moisture permeable sheet

Claims (5)

[Claims] 1. A heat collector comprising a container body through which water circulates and an outer box surrounding the container body, wherein a thin heat insulating sheet is used as a heat insulating layer provided between the container body and the outer box. A solar system characterized by that: 2. The solar system according to claim 1, wherein the heat insulating sheet is obtained by impregnating at least a part of an impregnating substrate with a resin composition containing hollow particles and / or air bubbles. . 3. The solar system according to claim 1, wherein the heat-insulating sheet has a coating tank laminated on one or both sides thereof. 4. The solar system according to claim 1, wherein a thin heat insulating sheet is also attached to an outer surface of the outer box. 5. The solar system according to claim 4, wherein the thin heat insulating sheet adhered to the outer surface of the outer box is accompanied by decoration.