Patent ID: 9546109
Date: 2017-01-17
CPC Classifications: C03C,F24S,Y02E

Claim:
1. A method for manufacturing a vacuum solar thermal panel, wherein said vacuum solar thermal panel comprises at least a tempered glass plate and a metal frame attached to said tempered glass plate; the method comprising: providing a metal frame and a tempered glass plate; setting the metal frame and the tempered glass plate in a final relative position in which they can be attached together by a glass-metal seal; after setting the metal frame and the tempered glass plate in the final relative position, performing a frit firing cycle in order to form a glass-metal seal between the tempered glass plate and the metal frame, said frit firing cycle comprising: a first heating phase, performed after setting the metal frame and the tempered glass plate in their final relative position, of the tempered glass plate up to a maximum temperature (Tm), that preserves a suitable pre-stress level of the tempered glass plate; a further heating phase, performed after setting the metal frame and the tempered glass plate in their final relative position, said further heating phase being a selective heating phase of a melting area of the tempered glass plate performed at a second temperature (Th) which is greater than the maximum temperature (Tm), so that the temperature of a tempered glass plate portion at the melting area is kept higher than the temperature of the remaining portions of the tempered glass plate, said selective heating phase comprising: an illumination phase of said tempered glass plate with light, wherein the light employed in said illumination phase is infrared light.