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US 2026/0132074 A1Published application
Greenhouse glazing
AssigneeAgc Glass Europe
InventorsSeyedmohammad SHAYESTEHAMINZADEH, Julien JEANFILS, Fabrice DUFOUR, Bruno CHAUSTEUR
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Abstract
A glazing for greenhouses designed to fit cold climate. The glazing is a vacuum isolating glazing unit with two glass substrates and each glass substrate has at least one main surface with a specific roughness and an antireflective layer. The VIG for greenhouses has a high PAR transmittance, a good hortiscatter and a good thermal insulation.
Claims20
1:
- A vacuum insulating glazing unit for a greenhouse, comprising:
- an outside glass substrate with 2 main surfaces referenced as P1 and P2, and
- an inside glass substrate with 2 main surfaces referenced as P3 and P4,
- wherein, the P4 main surface of the inside glass substrate has a specific roughness, said specific roughness is characterized by a Sa parameter comprised between 0.18 and 1.80 μm, a Sz parameter comprised between 1.5 and 10.0 μm and an Rsm parameter comprised between 65 and 125 μm.
1 more element
2:
- The vacuum insulating glazing unit of claim 1, wherein the specific roughness is characterized by the Sa parameter being at least 0.185 μm preferably at least 0.19 μm, more preferably at least 0.20 μm and being at most 1.8 μm.
3:
- The vacuum insulating glazing unit of claim 1, wherein the specific roughness is characterized by the Sz parameter being at least 2.0 μm, and being at most 10.0 μm.
4:
- The vacuum insulating glazing unit of claim 1, wherein the specific roughness is characterized by the Rsm parameter being at least 65 μm, and being at most 125 μm.
5:
- The vacuum isolating glazing unit of claim 1, wherein the P4 main surface is coated with an antireflective layer.
6:
- The vacuum insulating glazing unit of claim 5, wherein the antireflective layer deposited on P4 is a nano-porous silica layer having a thickness comprised between 80 and 150 nm, and has a refractive index which is at most 1.5.
7:
- The vacuum insulating glazing unit of claim 1, wherein the P4 and the P1 main surfaces are both coated with an antireflective coating.
8:
- The vacuum insulating glazing unit of claim 7, wherein the antireflective layer is a nano-porous silica layer having a thickness comprised between 80 and 150 nm, and has a refractive index which is at most 1.5.
9:
- The vacuum insulating glazing unit of claim 1, wherein the P3 main surface is coated with a low-e stack.
10:
- The vacuum insulating glazing unit of claim 9, wherein the low-e stack has a single silver layer.
11:
- The vacuum insulating glazing unit of claim 1, wherein the vacuum insulating glazing unit has a PAR light transmittance greater than 80%.
12:
- The vacuum insulating glazing unit of claim 1, wherein a U value, expressed in W/m2·K, is smaller than 3.0.
13:
- The vacuum insulating glazing unit of the claim 9, wherein the U value, expressed in W/m2·K, is smaller than 1.0.
14:
- The vacuum insulating glazing unit of claim 1, wherein a U values ratio (U90°/U22°), where U90° is a U value for a substrate at 90° related to a ground and the U22° is a U value for a substrate at 22° related to the ground, is comprised between 0.9 and 1.1.
15:
- The vacuum insulating glazing unit of claim 1, wherein the roughness is a consequence of a random texturing.
16:
- The vacuum insulating glazing unit of claim 1, wherein a vacuum cavity has a pressure level that is not greater than 0.1 mbar.
17:
- The vacuum insulating glazing unit of claim 1, wherein both glass substrates have a composition characterized by an iron content expressed in weight percent of Fe2O3 which is at most 0.1%.
18:
- The vacuum insulating glazing unit of claim 1, wherein the specific roughness is characterized by the Sa parameter being at least 0.20 μm and being at most 1.6 μm, the Sz parameter being at least 2.0 μm and at most 9.0 μm, and by the Rsm parameter being at least 75 μm and being at most 115 μm.
19:
- The vacuum insulating glazing unit of claim 8, wherein the antireflective layer has a refractive index which is at most 1.38.
20:
- The vacuum insulating glazing unit of claim 14, wherein the U values ratio (U90°/U22°) is between 0.95 and 1.05.