JP5424059B2 - Multi-layer glass structure and cold insulation showcase - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a multilayer glass structure and a cold storage showcase, and more particularly to a multilayer glass structure for a cold storage showcase used for refrigeration or frozen storage of goods at a convenience store and the like, and the multilayer glass structure. Related to a cold showcase.

  Conventionally, convenience stores and the like store and sell various products (beverages, fresh foods, frozen foods, etc.) in a cold showcase. The cold storage showcase has a door made of a sash and a glass plate on the front, and a handle is attached to the front of the sash. The customer can open and close the door back and forth by opening and closing the handle. Further, since the door is generally made of glass except for the peripheral sash, the customer can identify and select a product in the warehouse without opening the door. Therefore, fogging on the glass surface of the door is a major obstacle to sales promotion. Conventionally, a transparent conductive film such as fluorine-doped tin oxide or ITO (tin-doped indium oxide) is provided on the glass surface, and this is energized. By generating heat, the generation of cloudiness was prevented (Patent Document 1).

  Further, Patent Document 2 describes an anti-icing film coat for a cold-insulated showcase, and Patent Documents 3 and 4 describe low-emission films.

JP-A-6-294573 JP-A-2005-119920 Japanese Patent Publication No. 8-32436 JP-A-6-144874

However, such a transparent conductive film consumes a relatively large amount of power, such as 150 W / m ^2, and is required to reduce the power required to prevent fogging in order to meet the recent needs for energy saving and CO ₂ reduction. One method is a non-heat (non-power) anti-fogging method with a multi-layer glass structure in which a low emissivity film is coated on the glass surface and the space between each plate of the multi-layer glass is filled with a heat insulating gas. It was examined.

  However, this non-heated multi-layer glass structure using only a low emissivity film and an insulating gas can provide sufficient dew condensation prevention in relatively low humidity periods such as spring, autumn and winter, but high humidity such as during rainy seasons. Since it is not possible to completely prevent condensation at the time, it has not been put into practical use as a double-glazed glass for low-temperature equipment such as a refrigeration showcase.

  The present invention solves such problems and completely prevents condensation and icing on the glass for a year with significantly lower power compared to the conventional one, while maintaining the visibility of the products in the warehouse. An object of the present invention is to provide a multi-layer glass structure that prevents the clothes and the like from getting wet and a cold showcase.

  In order to achieve the above object, the present invention provides a multi-layer glass structure used for a cold-insulated showcase, a first glass plate positioned inside the cold-insulated showcase, and the first glass plate. And a second glass plate that is opposed to and spaced outside the predetermined space, and a third glass plate that is opposed to the second glass plate and spaced apart from the predetermined space and is further located outside the warehouse. Is a multi-layer glass structure that constitutes an integral structure of these first, second, and third glass plates by holding them on the peripheral edge portions of the first glass plate through spacers. And a low radiation film is added to at least one of the second glass plate, a conductive film is added to the inner surface of the third glass plate, the spacer is made of resin, and the first and second glass plates are made of resin. Less space between the glass plates and between the second and third glass plates While the Kutomo, provides a multilayer glass structures, characterized in that filled with insulation gas.

  Moreover, in order to achieve the above object, the present invention is a multi-layer glass structure used for a cold insulation showcase, the first glass plate positioned inside the cold insulation showcase, and the first glass plate A second glass plate opposed to the glass plate with a predetermined space and located outside the warehouse, and a third glass located opposite to the second glass plate with a predetermined space and located further outside the warehouse. A multi-layer glass structure that constitutes an integral structure of these by holding a plate on the peripheral edge of each of the first, second, and third glass plates via a spacer. A low radiation film is added to at least one of the glass plate and the third glass plate, a conductive film is added to the outer surface of the first glass plate, the spacer is made of resin, and the first and first glass plates are made of resin. Space between two glass plates, empty space between second and third glass plates At least one of, providing a double-glazing structure, characterized in that filled with insulation gas.

  In any of the inventions, an anti-icing film can be added to the inner surface of the first glass plate to prevent icing on this surface.

  Furthermore, according to the present invention, it is preferable that an anti-icing film is added to the inner surface of the first glass plate.

  In the present invention, the low radiation film is added to the outer side of the first glass plate and at least one side of the second glass plate, and the conductive film is added to the inner side surface of the third glass plate. It is preferable that

  In the present invention, the low radiation film is added to the outside of the first glass plate and the outside of the second glass plate, and a conductive film is formed on the inside surface of the third glass plate. It is preferable that it is added.

  In the present invention, a low radiation film is added to at least one side of the second glass plate and the inner side of the third glass plate, and a conductive film is added to the outer side surface of the first glass plate. It is preferable that

  Further, the low radiation film of the present invention preferably has an emissivity of 0.2 or less in accordance with JIS R 3106 (1998).

  Further, the low radiation film of the present invention preferably has an emissivity of 0.1 or less in accordance with JIS R 3106 (1998).

  The conductive film of the present invention is preferably made of antimony-doped tin oxide or bismuth-doped tin oxide.

  The conductive film of the present invention is preferably made of fluorine-doped tin oxide.

  In order to achieve the above object, the present invention provides a cold insulation showcase comprising the multilayer glass structure of the present invention.

  As one aspect of the multilayer glass structure according to the present invention, a film having an emissivity (JIS R 3106 (1998) regulation) of 0.2 or less is added to the first glass plate and the second glass plate. The space between the glass plate and the second glass plate and the space between the second and third glass plates are filled with a heat insulating gas such as krypton gas (Kr) or argon (Ar) gas, and the spacer material is polyamide or polypropylene (polypropylene). ), Etc., when the inside air temperature is −25 ° C., the conductive film of the third glass plate is not energized until the outside air temperature (in the store) is 25 ° C. and 75% RH. In addition, condensation on the outside glass plate (third glass plate) can be prevented.

  So far, field tests have been conducted for more than half a year, and it has been proved that condensation can be prevented without energization in the above environment.

  In the multilayer glass structure according to the present invention, when the outside (in-store) air temperature / humidity exceeds the above, the conductive film is energized and heated above the dew point to prevent dew condensation on the surface.

  As for energization of the conductive film, in conjunction with the in-store temperature and humidity measurement system installed in the store, the energization is automatically started when the store exceeds a certain humidity, or a manual switch is used before condensation occurs. It is possible to start energization preventively. Compared to conventional double-glazed glass with conductive glass that does not use a low-radiation film or insulating gas, the double-glazed glass itself has high heat insulation properties and suppresses the heat flux to the inside of the cabinet, so the power density required in the past The temperature of the third glass plate can be raised to the dew point or more at half or less of the above.

  In addition, since the glass plate quickly heats up with a power density less than half that of the conventional case, even if condensation occurs, it is possible to dramatically shorten the time until the condensation is evaporated and removed.

In the case of a 24-hour convenience store, it can contribute greatly to reduce electricity rate reduction and CO ₂ emissions.

  Further, by providing an anti-icing film on the inner surface of the first glass plate located inside the storage, it is possible to prevent icing that occurs on the surface when the door is opened.

  When the conductive film of the third glass plate is energized, heat is transmitted to the first glass plate and there is a certain temperature rise, so that the effect of preventing freezing can be further increased.

  In addition to eliminating condensation on the outer surface of the third glass plate, the third glass plate can be energized in order to eliminate icing on the inner surface of the first glass plate.

  When it is desired to prioritize the elimination of icing on the inner surface of the first glass plate over the elimination of condensation on the outer surface of the third glass plate, the first glass is used rather than adding a conductive film to the third glass plate. A higher effect can be obtained by adding to the plate.

  In order to obtain both effects of eliminating condensation on the outer surface of the third glass plate and defrosting on the inner surface of the first glass plate, the conductive film is formed on both the third glass plate and the first glass plate. It is also possible to add to.

Sectional drawing which shows one Embodiment of the multilayer glass structure which concerns on Claim 1 of this invention Sectional drawing which shows one Embodiment of the multilayer glass structure which concerns on Claim 2 of this invention Sectional drawing which shows one Embodiment of the multilayer glass structure which concerns on Claim 3 of this invention Sectional drawing which shows one Embodiment of the multilayer glass structure which concerns on Claim 4 of this invention Sectional drawing which shows another one Embodiment of the multilayer glass structure which concerns on Claim 1 of this invention Sectional drawing which shows another one Embodiment of the multilayer glass structure which concerns on Claim 3 of this invention Sectional drawing of the principal part which showed the structure of the multilayer glass structure of Example 2 Cross-sectional view of the relevant part showing the structure of the multilayer glass structure of Comparative Example 1 Front view of door showing temperature measurement position of multi-layer glass structure Sectional drawing of the door which follows the AA 'line of FIG. The principal part which showed the structure of the multilayer glass structure of the comparative example 2 The graph which showed the relationship between the power consumption and the dew condensation humidity in Example 2 and Comparative Example 2.

  Hereinafter, preferred embodiments of a multilayer glass structure and a cold insulating showcase according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view of an essential part showing an embodiment of a multilayer glass structure 10 corresponding to claim 1 of the present invention.

  A multilayer glass structure 10 shown in the figure is a multilayer glass structure 10 used in a cold showcase. The multi-layer glass structure 10 includes a first glass plate 12 positioned inside the cold storage showcase, a second glass plate 12 facing the first glass plate 12 with a predetermined space 13 and positioned outside the store. Glass plate 14, and a second glass plate 14 and a third glass plate 16 which are opposed to each other with a predetermined space 15 therebetween and are located on the outside of the warehouse. And this multilayer glass structure 10 is comprised integrally by the peripheral part of 1st, 2nd and 3rd glass plates 12, 14, and 16 being hold | maintained via the spacers 18 and 20. Yes.

  In this multilayer glass structure 10, low radiation films 22 and 22 are added to at least one of the first glass plate 12 and the second glass plate 14 (both in FIG. 1). A conductive film 24 is added to the inner surface of the third glass plate 16. The spacers 18 and 20 are made of resin. At least one of the space 13 between the first and second glass plates 12 and 14 and the space 15 between the second and third glass plates 14 and 16 (both in FIG. 1) is filled with a heat insulating gas G. Has been.

  According to the multilayer glass structure 10 configured as described above, the effects described in the above-mentioned effect column can be obtained.

  The thickness of the first, second, and third glass plates 12, 14, and 16 is not particularly limited, but it is preferably 2.5 to 5 mm, which has been used as a window even when only one sheet is used. If necessary, tempered glass and laminated glass may be applied to one or all three sheets.

  The thicker the glass plates and the glass plate spaces 13, 15, the better the heat insulation effect. The preferable space thickness is 2 to 12 mm.

  In the present invention, the glass includes both inorganic glass and organic glass. Organic glass refers to a transparent resin such as acrylic.

  The low-emission film 22 is preferably a thin film, and is a film in which a film containing silver as a main component is sandwiched between oxide thin films containing zinc as a main component (zinc oxide / silver / zinc oxide) Are preferred). In order to lower the low emissivity, a laminate film (zinc oxide / silver / zinc oxide / silver / zinc oxide) in which the laminate is doubled is more preferable. Since this laminated film has high transmittance and low radiation, the inside of the show window can be easily seen.

  The emissivity of the low radiation film 22 is preferably 0.2 or less, more preferably 0.1 or less, according to JIS R 3106 (1998).

  The heat insulating gas G means a gas having a thermal conductivity smaller than that of air, and krypton (Kr) gas and argon (Ar) gas, which are rare gases, are preferable. The higher the concentration of the rare gas in the heat insulating gas (the locality rate), the better. If the thermal conductivity is smaller than air, a mixed gas of air and rare gas may be used. A more preferable example is a gas in which krypton gas is mixed with dry nitrogen gas and the krypton concentration is 30 to 98%.

  The spacers 18 and 20 have a function of maintaining the distance between the glass plates, a function of adhering the glass plates, and a function of sealing the inside of the air layer, and particularly have a function of maintaining the distance between the glass plates. It means that the main constituent material of the member is a resin. The main constituent of resin means that a part of metal may be introduced into the resin.

The conductive film 24 only needs to have a function of energizing and heating the glass plate, and may be a conductive thin film, a heat generating wire on the surface of the glass plate, or a heat generating silver-based print. Here, it is included in the conductive film. Among these, the one using a conductive thin film that allows the inside of the show window to be easily observed is preferable. As a material for the conductive thin film, antimony-doped tin oxide (Sb doped SnO ₂ ), bismuth-doped tin oxide (Bi doped) SnO ₂ ) or fluorine-doped tin oxide (F doped SnO ₂ ) is preferable, and fluorine-doped tin oxide is more preferable because of low cost.

  In addition, the low radiation film | membranes 22 and 22 of the 1st, 2nd glass plates 12 and 14 may be added to any of an inner side surface and an outer side surface.

  FIG. 5 is a cross-sectional view of an essential part showing another embodiment of the multilayer glass structure 30 corresponding to claim 1 of the present invention.

  In the multilayer glass structure 30 shown in the figure, the low radiation film 22 is not added to the first glass plate 12, and the low radiation film 22 is added to the inner side surface of the second glass plate 14. Yes. According to the multi-layer glass structure 30, the cold display case is a walk-in door for a large size and a reach in door for a small size depending on the size of the showcase body. Although generally referred to, the present invention includes both aspects. Further, the number of doors used is not limited to one and may be two or more.

  FIG. 2 is a cross-sectional view of an essential part showing an embodiment of a multilayer glass structure 40 corresponding to claim 2 of the present invention, and the same or similar members as those of the multilayer glass structure 10 shown in FIG. Are described with the same reference numerals.

  The multi-layer glass structure 40 includes a first glass plate 12 located on the inner side of the cold storage showcase, and a second glass plate facing the first glass plate 12 with a predetermined space 13 therebetween and located on the outer side of the chamber. Glass plate 14, and a second glass plate 14 and a third glass plate 16 which are opposed to each other with a predetermined space 15 therebetween and are located on the outside of the warehouse. And this multilayer glass structure 40 is comprised integrally by the peripheral part of the 1st, 2nd and 3rd glass plates 12, 14, and 16 being hold | maintained via the spacers 18 and 20. FIG. ing. Moreover, low radiation films 22 and 22 are added to at least one of the second glass plate 14 and the third glass plate 16 (both in FIG. 2), and a conductive film is formed on the outer surface of the first glass plate 12. 42 is added. The spacers 18 and 20 are made of resin, and at least one of the space 13 between the first and second glass plates 12 and 14 and the space 15 between the second and third glass plates 14 and 16 (both in FIG. 2). Is filled with a heat insulating gas G.

  Also in this multilayer glass structure 40, an effect equivalent to that of the multilayer glass structure 10 shown in FIG. 1 can be obtained.

  In addition, the low radiation film | membranes 22 and 22 of the 2nd, 3rd glass plates 14 and 16 may be added to any of an inner side surface and an outer side surface.

  FIGS. 3 and 4 are cross-sectional views of main parts of the multi-layer glass structures 50 and 60 showing an embodiment corresponding to claims 3 and 4, respectively. Ice films 52 and 62 are coated.

  FIG. 6 is a cross-sectional view of an essential part showing another embodiment of the multilayer glass structure 70 corresponding to claim 3. In this multilayer glass structure 70, an anti-icing film 72 is coated on the inner side surface of the first glass plate 12.

  Here, the installation method of the anti-icing films 52, 62, 72 will be described. A chemical solution obtained by dissolving a solid content having an anti-icing function in a solvent is applied to a glass plate (first glass plate 12), and the solvent is volatilized and dried to form an anti-icing film on the surface of the glass plate. . In addition, you may bond the anti-icing resin film obtained by forming the anti-icing film | membrane 52,62,72 on a transparent resin film to a glass plate.

  In addition, as the anti-icing films 52, 62, and 72, a hydrophilic film disclosed in Patent Document 2 or the like can be applied. It is also possible to use an anti-icing film having water absorption in addition to hydrophilicity. As the low radiation film, for example, a transparent conductive film disclosed in Patent Document 3 or a heat ray reflective film disclosed in Patent Document 4 can be applied.

[Example]
Example 1
Low radiation films with an emissivity (JIS R 3106 (1998) regulation) of 0.1 are added to the first glass plate (3 mm thickness) and the second glass plate (3 mm thickness). The space between the glass plates (8mm), the space between the third glass plate (3mm thickness) and the second glass plate (8mm) is filled with krypton gas, and the spacer material is made of polyamide (polyamide) resin. Created the structure. An electrically conductive heating conductive film was installed inside the third glass plate. The size of the multilayer glass structure is 1548 mm in height and 683 mm in width.

The multi-layer glass structure is set to an internal air temperature of −25 ° C., and the external temperature is up to 25 ° C. and 75% RH without energizing the conductive film of the third glass plate. When the conditions exceeded air temperature and humidity of 25 ° C. and 75% RH, 150 W / m ² of power was applied to the conductive film of the third glass plate.

  In this state, when an environmental test was conducted for half a year, it was visually confirmed that there was no condensation on the outside glass plate (third glass plate).

  In addition, in a standard store environment where a multi-layer glass structure is installed, the number of days exceeding 25 ° C. and 75% RH was 20 days per year. Therefore, the estimated amount of electricity used for one year when used continuously for 24 hours has been greatly reduced to 3% or less of the conventional multilayer glass with conductive glass.

(Example 2)
The multilayer glass structure of FIG. 7A that is Example 2 has the same configuration as the multilayer glass structure 10 shown in FIG. The multilayer glass structure 10 of Example 2 has emissivity (JIS R 3106 (JIS R 3106) on the outer surface of each of the first glass plate (3 mm thickness) 12 and the second glass plate (3 mm thickness) 12. 1998) is a low-emission film whose film size is 0.1 (film size is 648 mm × 1519 mm) 22 and 22 are added. The multilayer glass structure 10 includes a space (8 mm) 13 between the first glass plate 12 and the second glass plate 14, and a third glass plate (3 mm thickness) 16 and the second glass. The space (8 mm) 15 between the plates 14 is filled with 95% of krypton gas. Further, the spacers 18 and 20 of the multilayer glass structure 10 are made of polyamide resin. Furthermore, a conductive film 24 for current heating (fluorine-doped tin oxide, sheet resistance is 163Ω / □) is provided on the inner surface of the third glass plate 16. The size of the multilayer glass structure 10 is 1548 mm in height and 683 mm in width.

  On the other hand, the multilayer glass structure 80 shown in FIG. 7B which is Comparative Example 1 is formed on the outer surface of each of the second glass plate (3 mm thickness) 14 and the third glass plate (3 mm thickness) 16. Low radiation films 22 and 22 having an emissivity (JIS R 3106 (1998) regulation) of 0.1 are added. Also, the first glass has no film on 12. This multilayer glass structure 80 has the same structure as the multilayer glass structure 10 of Example 2 except for the type of film on the glass surface, presence / absence, and coating surface.

(Dew condensation test)
The double glass structure 10 of Example 2 and the double glass structure 80 of Comparative Example 1 are installed in a door (width 700 mm, height 1593 mm), and the double glass structure 10 of Example 2 is installed. Is installed in the refrigerator so that the door on which the double-sided glass structure 80 of Comparative Example 1 is installed is on the right side when viewed from the front, and the surface temperature of each of the double-layer glass structures 10 and 80 The inside temperature and the outside temperature were measured.

  The surface temperature measurement positions of each of the multilayer glass structures 10 and 80 are shown in FIG. 8, and the temperature measurement positions inside and outside the warehouse are shown in FIG.

  FIG. 8 is a front view of a cold showcase in which the door of the multilayer glass structure 10 of Example 2 disposed on the left side and the door of the multilayer glass structure 80 of Comparative Example 1 disposed on the right side are butted together. 9 is a cross-sectional view taken along line AA ′ in FIG.

  In FIG. 9, measurement positions OUT-1, OUT-2, and OUT-3 indicate temperature measurement positions outside the warehouse, and IN-1, IN-2, and IN-3 indicate temperature measurement positions inside the warehouse. OUT-1, OUT-2, and OUT-3 are positions spaced a (a = 300) mm horizontally from the outer surface of the third glass plate 16 of the multilayer glass structures 10 and 80, and OUT -1 is a position separated by b (b = 100) mm from the upper edge of the multilayer glass structures 10 and 80 downward in the vertical direction. Further, OUT-3 is a position that is c (c = 100) mm away from the lower edge of the multilayer glass structures 10 and 80 in the vertical direction, and OUT-2 is OUT-1 and OUT-2. Is the intermediate position in the vertical direction. IN-1, IN-2, and IN-3 are target positions of OUT-1, OUT-2, and OUT-3 with the multilayer glass structures 10 and 80 interposed therebetween.

  With respect to the surface temperature measurement positions of the multilayer glass structures 10 and 80 of FIG. 8, in the door in which the multilayer glass structure 10 of Example 2 is incorporated, position 1 in the figure (and 4 in the same column as position 1) 7, 10, 13), position 2 (and 5, 8, 11, 14 in the same column as position 2), position 3 (and 6, 9, 12, 15 in the same column as position 3) The spacing is set to d (d = 300) mm, position 1 (and 2, 3 in the same row as position 1), position 4 (and 5, 6 in the same row as position 4), position 7 (and position 8 and 9 in the same row as 7, position 10 (and 11 and 12 in the same row as position 10), and position 13 (and 14 and 15 in the same row as position 13) are also d (d = 300). ) Mm. The position 1 is set at e (e = 100) mm in the horizontal direction and f (f = 150) mm in the vertical direction with the upper left corner of the multilayer glass structure 10 as a reference. The surface temperature of the multilayer glass structure 10 was measured on the outer surface of the third glass. Moreover, the temperature measurement positions 16 to 30 of the door in which the multilayer glass structure 80 of Comparative Example 1 is incorporated are the positions of the same dimensions based on the upper left corner of the multilayer glass structure 80 as in Example 2. Is set to In this case, the surface temperature of the multilayer glass structure 80 was also measured on the outer surface of the third glass.

[Evaluation 1]
The conductive film 24 of the multilayer glass structure 10 of Example 2 was energized, and the dew condensation state at the time of energization was compared with the multilayer glass structure 80 of Comparative Example 1. The amount of energization is indicated by power consumption.

  Condensation comparisons are: (1) the temperature outside the freezer, (2) the temperature inside the freezer, (3) the glass surface temperature, and (4) that part of the glass surface temperature is condensed (4) Expressed as “humidity”. Here, humidity is relative humidity.

  The temperature outside the freezer and the temperature inside the freezer were measured, the in-plane temperature distribution on the glass surface was measured (1 to 15 in FIG. 8), and the lowest temperature was selected as the glass surface temperature. Wet humidity was determined from the outside temperature of the freezer and the glass surface temperature using the wet air diagram (Source: Architectural Design Data Collection 1 Environment). Both humidity calculated | required by said method was compared. Moreover, the comparison between Example 2 and Comparative Example 1 was performed by simultaneously measuring two multilayer glass structures 10 and 80 on the same plane as shown in FIG. The results of Evaluation 1 are shown in Table 1 below.

  As shown in Evaluation 1-1, even when the conductive film 24 of the multilayer glass structure 10 of Example 2 is not energized, the multilayer glass structure 80 of Comparative Example 1 is condensed in the multilayer glass structure 10. It was found that condensation does not occur unless the humidity is 2.3% higher than the humidity.

As shown in Evaluation 1-2, when 23.8 W / m ² of power was applied to the conductive film 24 of the multilayer glass structure 10 of Example 2, the multilayer glass structure 10 was It has been found that condensation does not occur unless the humidity is 9.2% higher than the humidity at which the laminated glass structure 80 is condensed.

As shown in Evaluation 1-3, when 52.8 W / m ² of power was applied to the conductive film 24 of the multilayer glass structure 10 of Example 2, the multilayer glass structure 10 was It was found that the layered glass structure 80 was 25.1% higher than the humidity at which dew condensation occurs, and no condensation occurs unless the humidity reaches 100%.

As shown in Evaluation 1-4, when the conductive film 24 of the multilayer glass structure 10 of Example 2 was energized with 93.1 W / m ² , the multilayer glass structure 10 was It was found that the layered glass structure 80 was 24.2% higher than the humidity at which dew condensation occurs, and no dew condensation occurs unless the humidity reaches 100%.

  It should be noted that at 100% humidity, all in contact with 100% humidity air is in a dew-condensed state, and the states of the examples of evaluations 1-3 and 1-4 indicate that the upper limit value has been reached.

  Therefore, the multilayer glass structure 10 of Example 2 was able to increase the humidity of dew condensation as compared with the multilayer glass structure 80 of Comparative Example 1.

(Comparative Example 2)
The multilayer glass structure 90 shown in FIG. 10 which is Comparative Example 2 is the same size as the multilayer glass structure 80 of Comparative Example 1, but the interior of the third glass plate 16 extending over the second glass plate 14. The low-emission films 22 and 22 added to are removed, and a conductive film 24 is installed on the inner surface of the third glass plate 16.

(Condensation test: Evaluation 2)
The dew condensation test of Example 2 and Comparative Example 2 was performed. The method for measuring the temperature is the same as in Evaluation 1 for Evaluation 2. Table 2 below shows the results of Evaluation 2.

Conventionally, 150 W / m ² has been common when energizing a conductive film. The comparative example 2 was operated with a power consumption of about 150 W / m ² , and the evaluation 2-1 to 2-3 was performed with the power consumption changed in the example 2. As shown in the table, if the double glazing structure 90 of Comparative Example 2 is not operated at a power consumption of 145 W / m ² , the double glazing structure 90 is in an environment where the temperature is 26 ° C. and the inside of the refrigerator is approximately −22 ° C. Condensation occurs at a humidity of 88 to 91% or higher. In contrast, the double-glazing structure 10 of Example 2, 82.9% in power consumption 13.5W / ^{m 2,} power consumption 23.1W / ^{m 2,} power consumption 36.4W / ^{m 2} It was 94.6%.

FIG. 11 is a graph showing the relationship between the power consumption and the humidity at which condensation occurs. According to the figure, in the double-layer glass structure 10 of Example 2, the “humidity to condense” is about the same as when the double-layer glass structure 90 of Comparative Example 2 is operated with power consumption of about 150 W / m ^2. Can be realized by an operation of 25 to 30 W / m ² and has an energy saving effect of about 1/5.

  As described above, the multilayer glass structure according to the present invention is suitable for a cold storage showcase used for storing refrigerated or frozen foods. Further, it is obvious that the present invention can be applied not only to the hinged door but also to a sliding door and a fixed window. The present invention can also be applied to windows of automobiles, railway vehicles, airplanes, ships, or buildings. Furthermore, in the door structure according to the present invention, laminated glass or a resin plate can be appropriately used as an example of the glass plate.

  DESCRIPTION OF SYMBOLS 10 ... Multi-layer glass structure, 12 ... 1st glass plate, 13 ... Space, 14 ... 2nd glass plate, 15 ... Space, 16 ... 3rd glass plate, 18 ... Spacer, 20 ... Spacer, 22 ... Low radiation film, 24 ... conductive film, 30 ... multilayer glass structure, 40 ... multilayer glass structure, 42 ... conductive film, 50 ... multilayer glass structure, 52 ... anti-icing film, 60 ... multilayer glass structure , 62 ... Anti-icing film, 70 ... Multi-layer glass structure, 72 ... Anti-icing film, 80 ... Multi-layer glass structure, 90 ... Multi-layer glass structure

Claims (11)

A multi-layer glass structure used in a cold-insulated showcase, the first glass plate located inside the cold-insulated showcase, facing the first glass plate with a predetermined space and outside the warehouse A second glass plate positioned at a position, a third glass plate positioned opposite to the second glass plate with a predetermined space therebetween, and further positioned outside the warehouse, and the first, second, and third glass plates A multi-layer glass structure that constitutes an integral structure of these by holding the peripheral portion of the glass plate via a spacer,
A low radiation film is added to at least one of the first glass plate and the second glass plate,
A conductive film is added to the inner surface of the third glass plate,
The spacer is made of resin,
A multi-layer glass structure, wherein a heat insulating gas is filled in at least one of a space between the first and second glass plates and a space between the second and third glass plates. A multi-layer glass structure used in a cold-insulated showcase, the first glass plate located inside the cold-insulated showcase, facing the first glass plate with a predetermined space and outside the warehouse A second glass plate positioned at a position, a third glass plate positioned opposite to the second glass plate with a predetermined space therebetween, and further positioned outside the warehouse, and the first, second, and third glass plates A multi-layer glass structure that constitutes an integral structure of these by holding the peripheral portion of the glass plate via a spacer,
A low radiation film is added to at least one of the second glass plate and the third glass plate,
A conductive film is added to the outer surface of the first glass plate,
The spacer is made of resin,
A multi-layer glass structure, wherein a heat insulating gas is filled in at least one of a space between the first and second glass plates and a space between the second and third glass plates.   The multilayer glass structure according to claim 1 or 2, wherein an anti-icing film is coated on the inner surface of the first glass plate.   The low radiation film is added to the outer side of the first glass plate and at least one side of the second glass plate, and the conductive film is added to the inner surface of the third glass plate. A multilayer glass structure according to 1.   The low radiation film is added to the outer side of the first glass plate and the outer side of the second glass plate, and a conductive film is added to the inner surface of the third glass plate. 2. The multilayer glass structure according to 1.   The low radiation film is added to at least one side of the second glass plate and the inner side of the third glass plate, and the conductive film is added to the outer side surface of the first glass plate. A multilayer glass structure according to 1.   The multilayer glass structure according to any one of claims 1 to 6, wherein the low radiation film has an emissivity of 0.2 or less in accordance with JIS R 3106 (1998).   The multi-layer glass structure according to claim 7, wherein the low radiation film has an emissivity of 0.1 or less in accordance with JIS R 3106 (1998).   The multilayer glass structure according to claim 1, wherein the conductive film is made of tin oxide doped with antimony or tin oxide doped with bismuth.   The multilayer glass structure according to claim 1, wherein the conductive film is made of fluorine-doped tin oxide.   A cold-insulated showcase comprising the multilayer glass structure according to any one of claims 1 to 10.

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