Solar thermal collector and manufacturing method thereof

Abstract

A manufacturing method of a solar thermal collector includes the following steps. First, a first slab and a second slab stacked together are provided, and the first slab and the second slab are welded together along a plurality of rails, such that the first slab and the second slab are connected to each other through the rails to form a plurality of stripe-shaped connecting portions. Then, a high pressure medium is filled between the first slab and the second slab, such that the first slab and the second slab, except for the stripe-shaped connecting portions, are pushed away from each other by pressure provided from the high pressure medium, so as to form a plurality of channels divided by the stripe-shaped connecting portions. A solar selective coating is formed on an outer surface of the first slab.

What is claimed is: 
     
         1 . A manufacturing method of a solar thermal collector, comprising:
 providing a first slab and a second slab stacked together, and welding the first slab and the second slab together along a plurality of rails, such that the first slab and the second slab are connected to each other through the rails to form a plurality of stripe-shaped connecting portions;   filling a high pressure medium between the first slab and the second slab, such that the first slab and the second slab, except for the stripe-shaped connecting portions, are pushed away from each other by pressure provided from the high pressure medium, so as to form a plurality of channels divided by the stripe-shaped connecting portions; and   forming a solar selective coating on an outer surface of the first slab.   
     
     
         2 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , wherein the method of welding the first slab and the second slab comprises laser welding or ultrasonic welding. 
     
     
         3 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , wherein the high pressure medium comprises liquid or gas. 
     
     
         4 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , further comprising:
 disposing the first slab and the second slab in a mold before filling the high pressure medium and after welding the first slab and the second slab together, such that the first slab and the second slab are confined by the mold after filling the high pressure medium.   
     
     
         5 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , wherein the step of forming the solar selective coating on the outer surface of the first slab is performed before filling the high pressure medium. 
     
     
         6 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , wherein the step of forming the solar selective coating on the outer surface of the first slab is performed after filling the high pressure medium. 
     
     
         7 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , wherein a material of the first slab and the second slab comprises metal or plastic. 
     
     
         8 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , wherein the first slab and the second slab are respectively flat plates. 
     
     
         9 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , wherein one of the first slab and the second slab is a semi-shaped slab or a fully shaped slab. 
     
     
         10 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , wherein the first slab is a semi-shaped slab or a fully shaped slab, and the second slab is a plastic slab. 
     
     
         11 . The manufacturing method of the solar thermal collector as claimed in  claim 1 , the step of welding the first slab and the second slab along the rails is performed on an outer surface of the second slab. 
     
     
         12 . A solar thermal collector, comprising:
 a first slab;   a second slab stacked onto the first slab, the first slab and the second slab connected to each other through a plurality of rails to form a plurality of stripe-shaped connecting portions;   a plurality of channels formed by filling a high pressure medium between the first slab and the second slab for the first slab and the second slab, except for the stripe-shaped connecting portions, to be pushed away from each other by pressure provided from the high pressure medium; and   a solar selective coating disposed on an outer surface of the first slab.   
     
     
         13 . The solar thermal collector as claimed in  claim 12 , wherein the high pressure medium comprises liquid or gas. 
     
     
         14 . The solar thermal collector as claimed in  claim 12 , wherein a material of the first slab and the second slab comprises metal or plastic. 
     
     
         15 . The solar thermal collector as claimed in  claim 12 , wherein a plurality of first welding marks formed on the outer surface of the first slab by welding are smoother than a plurality of second welding marks formed on the outer surface of the second slab by welding.