GB2101186A - Solar control panel - Google Patents

Solar control panel Download PDF

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Publication number
GB2101186A
GB2101186A GB8120442A GB8120442A GB2101186A GB 2101186 A GB2101186 A GB 2101186A GB 8120442 A GB8120442 A GB 8120442A GB 8120442 A GB8120442 A GB 8120442A GB 2101186 A GB2101186 A GB 2101186A
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GB
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Application
Patent type
Prior art keywords
panel
glass
sheet
coating
optical coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB8120442A
Inventor
Jacques Falisse
Jean-Claude Hoyois
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Glass Europe SA
Original Assignee
AGC Glass Europe SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10165Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin particular functional features of the laminated glazing
    • B32B17/10174Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10009Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheet
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/1055Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer
    • B32B17/10761Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin characterized by the resin layer, i.e. interlayer containing vinyl acetal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00Buildings or parts thereof

Abstract

A solar screening panel comprises one or more sheets of glass 1, 2, a glass face of the panel bearing an optical coating 4, for screening off a proportion of solar radiation. The optical coating 4 is a light- transmitting coating which comprises a metal layer. The radiant energy absorbing properties of the glass sheets 1, 2 and the composition and thickness of the coating 4 are such that when the panel is arranged with the face bearing the coating 4 facing away from a radiation source the panel has a total energy transmission factor of less than 70% and a luminous transmission factor of at least 15% and such that when the panel is illuminated by CIE illuminant D65 the light reflected back from the panel has a dominant wavelength of from 585 to 595 nm and a colour purity of at least 40%. Laminated panels having total energy and luminous transmission factors as given above are disclosed in which similarly measured reflected light has a dominant wavelength of from 590 to 600 nm and a colour purity of at least 30%. The metal layer may be a gold layer e.g. 20.5 to 23.5 nm thick optionally provided with a bismuth oxide underlayer e.g. from 23.5 to 28.5 nm thick. <IMAGE>

Description

SPECIFICATION Solar control panel This invention relates to a solar screening panel which comprises one or more sheets of glass and wherein a glass face of the panel bears an optical coating for screening off a proportion of solar radiation.

A primary attribute of solar shading panels is their ability to screen off some of the incident solar radiation to achieve energy transmission characteristics satisfactory for the intended use environment of the panel.

A secondary requirement which is sometimes specified by purchasers relates to the aesthetic properties of the panel, and notably its colour as viewed by reflected light. The purchases choice of colour is determined by design parameters of the building or other structure in which the panel is to be used. The colour limits may be quite strict and somewhat remote from traditional colour ranges. Such market demands pose certain problems for the panel manufacturer. A particular problem, with which the present invention is concerned, is the manufacture of a solar screening panel which in reflection has a colour in the yellow-to-orange spectral range.

For meeting demands for solar control panels having by reflected light a colour in the yelloworange range it would be possible to employ colour modifiers in the glass batch from which the panel glass is produced and to provide the coloured glass with an optical coating for additional solar energy screening purposes as required, but this would be an uneconomic procedure except possibly for very large production runs.

For screening off solar radiations it is conventional to use glass bearing an energyabsorbing or reflecting coating, which may be a single layer or a plural layer coating. Metal coating layers are often employed for forming very effective solar energy screens. However the known metal-coated glass panels do not have a yellow-to-orange colouration as is within the purpose of the present invention.

The manner in which any given colour specifications are complied with must be compatible not only with the required solar energy screening function of the panel but also with the required visible light transmissivity. In general, an increase in the solar energy screening effect tends to entail a lower visible light transmission.

The invention is based on the discovery that a panel which has a favourable combination of energy screening and light transmission properties and which has a colour in the mid yellow-toorange range by reflected light can be economically produced by coating glass with a metal or metal-containing optical coating.

According to the present invention there is provided a solar screening panel which comprises one or more sheets of glass and wherein a glass face of the panel bears an optical coating for screening off a proportion of solar radiation, characterised in that said optical coating is a lighttransmitting coating which comprises a metal layer, the radiant energy absorbing properties of the glass sheet(s) and the composition and thickness of said coating being such that when the panel is arranged with the face bearing said optical coating facing away from the radiation source the panel has a total energy transmission factor of less than 70% and a luminous transmission factor of at least 15% and such that when the panel is illuminated by Illuminant D65 defined by the International Commission on illumination (reference CIE 17 Section 45-1 5-145) from the side of said coated sheet opposite that side thereof which bears said coating the light reflected back from the panel has a dominant wavelength of from 585 to 595 nm and a colour purity of at least 40% and preferably from 44 to 56%.

As used in this specification the term "luminous transmission factor" denotes a ratio of the quantity of visible light transmitted through a panel to the quantity of visible light incident upon the panel, such quantities being corrected integrations of the transmitted and incident light values respectively over the whole spectral range of visible light, the integrations being corrected to compensate for the spectral distribution of the illuminant and for the spectral sensitivity characteristics of the human eye. The measurements are made with a spectrophotometer and using a light source whose spectral composition is that of illuminant D65 as defined by the International Commission on Illumination (reference CIE Section 45-15-145).

This illuminant represents daylight with a colour temperature of about 6504K. The eye sensitivity correction factor applied is likewise that which is standardised by the International Commission on Illumination.

The term "total energy transmission factor" as used herein denotes the ratio of transmitted radiant energy to incident radiant solar energy and for the determination of such factor use is made of a radiator whose spectral composition is that of direct sunlight at an elevation of 300 above the horizon. The spectral composition is given by Moon's Table for a mass of air equal to 2. Colour purity as herein referred to is determined in the manner specified by the International Commission on Illumination (reference CIE Section 45-15-145).

It is an advantage of the invention that a panel having the combination of properties above defined can be produced using clear glass for the constituent glass sheet or sheets and clear glass is used in the preferred embodiments of the invention. The expression "clear glass" here denotes glass of such composition that a 6 mm thick sheet of the glass has a luminous transmission factor of at least 85%.

Preferably the light transmitted by the panel when illuminated by illuminant 065 in the manner above specified has a dominant wavelength of from 560 to 571 nm and a colour purity of not more than 26% and preferably between 18 and 24%.

In preferred embodiments of the invention, the panel comprises at least two sheets of glass held in spaced facing relationship and said optical coating is borne by an internal face of one of the sheets providing the external glass faces of the panel. In those circumstances the optical coating, being enclosed within the panel, is protected against mechanical damage.

Advantageously the panel is a hollow hermetically sealed unit with the optical coating located internally of the panel.

In the case of such a plural sheet panel, it is preferable for the panel, when arranged with the uncoated side of the coated sheet towards the radiation source, to have a luminous transmission factor of at least 37% and a total energy transmission factor of not more than 26%.

The invention includes panels in the form of a laminate in which the coated glass sheet is bonded to a second glass sheet by an intervening sheet of plastics material, e.g. a sheet of polyvinylbutyral.

In the case of a said laminate the intervening plastics sheet and the lamination of the glass sheets thereto have some influence on the screening properties of the panel. In some cases these properties can still be within the ranges hereinbefore specified. In other cases the plastics sheet and the lamination of the glass sheets thereto influence certain of the screening properties, namely the dominant wavelength and colour purity of the light reflected from the panel, to an extent such that they fall outside those ranges. However the modifications involved are small, and acceptable for the purposes in view.

The present invention therefore includes a solar screening panel which comprises said coated glass sheet and a second glass sheet and which is as hereinbefore defined except for the modification that at least one of the specified properties of the panel. namely the maximum total energy transmission factor, the minimum luminous transmission factor, the upper and lower limits of the dominant wavelength and the minimum colour purity of the reflected light, is attributable not only to the radiant energy absorbing properties of the glass sheets and the composition and thickness of said optical coating, but also to the presence of a plastics sheet between the coated side of said coated sheet and the other glass sheet, and to the bonding of such glass and plastics sheets together to form a laminate.

And the present invention also includes a solar screening panel in the form of a laminate comprising a first sheet of glass bearing on one face thereof an optical coating for screening off a proportion of solar radiation and a second sheet of glass bonded to the coated face of said first sheet by an intervening sheet of plastics material, wherein said optical coating is a light-transmitting coating which comprises a metal layer and wherein the radiant energy absorbing properties of the glass sheets, the composition and thickness of said optical coating and the composition of said plastics sheet and the bonding thereof to the glass sheets are such that when the panel is arranged with the face bearing said optical coating facing away from the radiation source the panel has a total energy transmission factor of less than 70% and a luminous transmission factor of at least 1 5% and such that when the panel is illuminated by Illuminant D65 defined by the International Commission on Illumination (reference DIE 17 Section 45-15-145) from the side of said coated sheet opposite that side thereof which bears said coating, the light reflected back trom the panel has a dominant wavelength of from 590 to 600 nm and a colour purity of at least 30%.And preferably the light transmitted by the panel has a dominant wavelength of from 560 to 571 nm and a colour purity of not more than 26%.

In a laminate according to the present invention the plastics sheet is preferably a sheet of polyvinylbutyral. The glass sheets are preferably sheets of clear glass.

A laminated panel according to the invention as above defined can be used as one pane of a hollow glazing unit. The second pane, mounted in spaced facing relation to such laminated panel can for example be a single sheet of clear glass or a further laminated panel. This second laminated panel can likewise be a panel according to the present invention.

The second pane of a hollow glazing unit incorporating a laminate according to the invention is preferably so constituted, e.g. by a single sheet of clear glass, that the above specified values for the maximum total energy transmission factor, the minimum luminous transmission factor.

the upper and lower limits of the dominant wavelength and the minimum colour purity of the reflected light, are applicable not only to the laminated panel but also to the hollow glazing unit as a whole.

The optical coating in panels according to the invention can be a single layer coating or it may comprise two or more superimposed layers.

in preferred panels according to the invention, the optical coating comprises a metal layer superimposed on an underlayer, e.g. an oxide layer. By suitable choice of the underlayer, its presence can facilitate the formation of a metal layer of high quality in terms of its uniformity.

In some embodiments of the invention the optical coating comprises a metal layer overcoated by another layer, e.g. an oxide layer.

Such an overcoating layer can have a protective function in respect of the mctal layer. There may be a layer beneath the metal layer and a layer above the metal layer in one and the same coating.

By using a metal layer in combination with at least one other layer, e.g. a metal oxide layer, a coating can be formed which has a higher luminous transmission factor than the metal layer alone.

In particularly recommended embodiments of the invention the metal layer is a gold layer. The use of gold is recommended because it is conducive to the formation of a coating wherein the required colour characteristic is combined with an infra-red transmissivity which is very low considered in relation to its luminous transmission factor.

The invention includes a panel wherein the said optical coating comprises a gold layer on a bismuth oxide underlayer. This layer combination is favoured because the bismuth oxide underlayer is particularly satisfactory as a subbing layer promoting the formation of a good quality gold layer and effective bonding thereof to the glass and because the combination enables a very favourable combination of luminous transmission and total energy transmission factors to be attained. Particularly favoured optical coatings comprise a layer of bismuth oxide having a thickness of from 23.5 to 28.5 nm covered by a gold layer of from 20.5 to 23.5 nm in thickness.

The following are examples of panels according to the invention: EXAMPLE 1 The panel was a double glazing panel of the glued type as illustrated in Fig. 1 of the accompanying drawings, comprising two sheets of clear glass 1 and 2 each having a thickness of 6 mm, mounted in spaced relation in a frame 3.

On its interior face the sheet 1 bore an optical coating 4 comprising a Bi2O3 underlayer overcoated by a layer of gold. The underlayer had a thickness of 26 nm and the gold layer had a thickness of 22 nm.

When arranged with sheet 1 towards the radiation source the panel had a total energy transmission factor of 24.0% and a luminous transmission factor of 39.0%. When illuminated by Illuminant D65 the sheet 1 being toward the light source, the light reflected back from the panel had a dominant wavelength of 589 nm and a colour purity of 50%. The light transmitted by the panel had a dominant wavelength of 564 nm and a colour purity of 20.5%.

EXAMPLE 2 The panel comprises a single coated clear glass sheet, the sheet and its coating being identical with sheet 1 in Example 1.

When arranged with the uncoated side of the sheet towards the radiation source the panel had a total energy transmission factor of 34% and a luminous transmission factor of 42%. When illuminated by illuminant D65 from the uncoated side of the sheet the light reflected back from the panel had a dominant wavelength of 591 nm and a colour purity of 51%. The light transmitted by the panel had a dominant wavelength of 565 nm and a colour purity of 20.0%.

EXAMPLE 3 The panel was in the form of a laminate, part of which is shown in Fig. 2 of the accompanying drawings. The laminate comprised a clear glass sheet 5 6 mm in thickness and bearing an optical coating 6 identical to coating 4 in Example 1.

Sheet 5 is bonded by its coated side and by means of a sheet 7 of polyvinylbutral 0.38 mm in thickness to a second sheet 8 of clear glass which was uncoated and also had a thickness of 6 mm.

The panel when arranged with the coated sheet towards the radiation source had a total energy transmission factor of 34% and a luminous transmission factor of 48%. When illuminated by Illuminant D65 with the exposed face of sheet 5 facing the light source the light reflected back from the panel had a dominant wavelength of 595 nm and a colour purity of 36%. The light transmitted by the panel had a dominant wavelength of 564 nm and a colour purity of 18%.

Claims (15)

1. A solar screening panel which comprises one or more sheets of glass and wherein a glass face of the panel bears an optical coating for screening off a proportion of solar radiation, characterised in that said optical coating is a light-transmitting coating which comprises a metal layer, the radiant energy absorbing properties of the glass sheet(s) and the composition and thickness of said coating being such that when the panel is arranged with the face bearing said optical coating facing away from the radiation source the panel has a total energy transmission factor of less than 70% and a luminous transmission factor of at least 15% and such that when the panel is illuminated by Illuminant D65 defined by the International Commission on Illumination (reference CIE 17 Section 45-1 5-145) from the side of said coated sheet opposite that side thereof which bears said coating the light reflected back from the panel has a dominant wavelength of from 585 to 595 nm and a colour purity of at least 40%.
2. A panel according to claim 1, wherein the light transmitted by the panel when it is illuminated as specified in claim 1 has a dominant wavelength of from 560 to 571 nm and a colour purity of not more than 26%.
3. A panel according to claim 1 or 2 wherein there are at least two sheets of glass held in spaced facing relationship and said optical coating is borne by an internal face of one of the sheets providing the external glass faces of the panel.
4. A panel according to claim 3, wherein the panel is a hollow hermetically sealed unit.
5. A panel according to claim 3 or 4, wherein when arranged as specified in claim 1 the panel has a luminous transmission factor of at least 37% and a total energy transmission factor of not more than 26%.
6. A panel which comprises said coated glass sheet and a second glass sheet and which is according to claim 1 except for the modification that at least one of the specified properties of the panel, namely the maximum total energy transmission factor, the minimum luminous transmission factor, the upper and lower limits of the dominant wavelength and the minimum colour purity of the reflected light, is attributable not only to the radiant energy absorbing properties of the glass sheets and the composition and thickness of said optical coating, but also to the presence of a plastics sheet between the coated side of said coated sheet and the second glass sheet, and to the bonding of such glass and plastics sheets together to form a laminate.
7. A solar screening panel in the form of a laminate comprising a first sheet of glass bearing on one face thereof an optical coating for screening off a proportion of solar radiation and a second sheet of glass bonded to the coated face of said first sheet by an intervening sheet of plastics material, wherein said optical coating is a lighttransmitting coating which comprises a metal layer, and wherein the radiant energy absorbing properties of the glass sheets, the composition and thickness of said optical coating and the composition of said plastics sheet and the bonding thereof to the glass sheets are such that when the panel is arranged with the face bearing said optical coating facing away from the radiation source the panel has a total energy transmission factor of less than 70% and a luminous transmission factor of at least 1 5% and such that when the panel is illuminated by Illuminant D65 defined by the International Commission on Illumination (reference DIE 17 Section 45-15-145) from the side of said coated sheet opposite that side thereof which bears said coating, the light reflected back from the panel has a dominant wavelength of from 590 to 600 nm and a colour purity of at least 30%.
8. A panel according to claim 6 or 7, wherein the light transmitted by the panel has a dominant wavelength of from 560 to 571 nm and a colour purity of not more than 26%.
9. A panel according to any preceding claim, wherein the optical coating comprises said metal layer superimposed on an underlayer.
10. A panel according to any preceding claim, wherein the optical coating comprises said metal layer overcoated by another layer.
11. A panel according to any preceding claim, wherein said metal layer is a gold layer.
12. A panel according to claim 11, wherein said optical coating comprises a gold layer and a bismuth oxide underlayer.
13. A panel according to claim 12, wherein said bismuth oxide layer is from 23.5 to 28.5 nm in thickness and said gold layer is from 20.5 to 23.5 nm in thickness.
14. A panel according to any preceding claim wherein the or each glass sheet is a sheet of clear glass.
15. A solar screening panel substantially according to to any of the Examples 1 to 3 herein.
GB8120442A 1981-07-02 1981-07-02 Solar control panel Withdrawn GB2101186A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8120442A GB2101186A (en) 1981-07-02 1981-07-02 Solar control panel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8120442A GB2101186A (en) 1981-07-02 1981-07-02 Solar control panel
BE1010546A BE893685A (en) 1981-07-02 1982-06-29 Glazing protection against solar radiation

Publications (1)

Publication Number Publication Date
GB2101186A true true GB2101186A (en) 1983-01-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8120442A Withdrawn GB2101186A (en) 1981-07-02 1981-07-02 Solar control panel

Country Status (2)

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BE (1) BE893685A (en)
GB (1) GB2101186A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2134717A1 (en) * 1996-03-26 1999-10-01 Glaverbel Coated substrate for transparent assembly with high selectivity.
WO2000046860A1 (en) * 1999-02-01 2000-08-10 Kurth Glas + Spiegel Ag Solar module

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2134717A1 (en) * 1996-03-26 1999-10-01 Glaverbel Coated substrate for transparent assembly with high selectivity.
WO2000046860A1 (en) * 1999-02-01 2000-08-10 Kurth Glas + Spiegel Ag Solar module

Also Published As

Publication number Publication date Type
BE893685A1 (en) grant
BE893685A (en) 1982-12-29 grant

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