Back to results
US 2024/0190760 A1Published application
Greenhouse glass for reduction of overheating during the hot seasons
AssigneeAgc Glass Europe
InventorsSeyedmohammad SHAYESTEHAMINZADEH, Daphné STASSEN, Fabrice DUFOUR
Life of this patent
Estimating the term…
Abstract
Greenhouses designed for hot climate geographical zones and hot periods of a year in both hot and cold climate geographical zones. The greenhouses are made with a specific coated glass allowing a very high hemispherical transmittance, a very high PAR transmittance and a tunable hortiscatter, when requested. The glazing contains a selectively high NIR reflectance and a high emissivity of glass, to allow the heat to leave the greenhouse to avoid a high temperature increase in the greenhouse. The glass can perform longer due to its durability.
Claims20
1:
- A highly PAR transmitting glazing for a greenhouse comprising:
- (a) a glass and
- (b) an antireflective coating on at least one face of said glass, said antireflective coating comprising,
- a first oxide layer having a high refractive index,
- a second oxide layer having a low refractive index,
- a third oxide layer having a high refractive index, and
- a fourth oxide layer having a low refractive index;
- wherein the highly PAR transmitting glazing has an NIR reflectance of at least 18%.
5 more elements
2:
- The highly PAR transmitting glazing of claim 1, wherein the antireflective coating is deposited on a glass surface facing an inside or an outside side of the greenhouse.
3:
- The highly PAR transmitting glazing of claim 1, wherein the glass face coated with the antireflective coating is textured and is facing a inside of the greenhouse.
4:
- The highly PAR transmitting glazing of claim 3, wherein each side of the glass is coated with the antireflective coating.
5:
- The highly PAR transmitting glazing according to claim 1, wherein the first and the third oxide layers have a high refractive index of at least 1.9.
6:
- The highly PAR transmitting glazing according to claim 1, wherein the second and the fourth oxide layers have a low refractive index of at most 1.7.
7:
- The highly PAR transmitting glazing according to claim 1, wherein the first oxide layer has a thickness between 5 and 15 nm, the second oxide layer has a thickness between 30 and 50 nm, the third oxide layer has thickness between 100 and 130 nm, and the fourth oxide layer has a thickness between 80 and 110 nm.
8:
- The highly PAR transmitting glazing according to claim 1, wherein the fourth oxide layer is a two part layer comprising a first part and a second part, both the first part and the second part being oxide layers having a low refractive index.
9:
- The highly PAR transmitting glazing according to claim 1, wherein the antireflective coating is hydrophilic and has a contact angle below 32°.
10:
- The highly PAR transmitting glazing according to claim 1, wherein a PAR transmittance is at least 92%.
11:
- The highly PAR transmitting glazing according to claim 1, wherein a hemispherical transmittance is at least 83%.
12:
- The highly PAR transmitting glazing according to claim 1, wherein an emissivity is at least 80%.
13:
- The highly PAR transmitting glazing according to claim 1, wherein the highly PAR transmitting glazing has an NIR reflectance of at least 19%.
14:
- The highly PAR transmitting glazing according to claim 1, wherein the first and the third oxide layers have a high refractive index of at least 2.1.
15:
- The highly PAR transmitting glazing to claim 1, wherein the second and the fourth oxide layers have a low refractive index of at most 1.5.
16:
- The highly PAR transmitting glazing according to claim 1, wherein the antireflective coating is hydrophilic and has a contact angle below 30°.
17:
- The highly PAR transmitting glazing to claim 1, wherein a PAR transmittance is at least 94%.
18:
- The highly PAR transmitting glazing to claim 1, wherein a hemispherical transmittance is at least 89%.
19:
- The highly PAR transmitting glazing according to claim 1, wherein an emissivity is at least 83%.
20:
- The highly PAR transmitting glazing according to claim 1, wherein the highly PAR transmitting glazing has an NIR reflectance of at least 20%.