Improvements in tubular solar collectors
A solar thermal collector, the technology of the thermal collector, applied in the solar thermal collector, the fixed base/support of the solar thermal collector, the solar thermal collector using the working fluid, etc., can solve the expensive, complicated, complicated steps, etc. question
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Embodiment 1
[0088] According to the invention, a metal is provided for the metal-glass joint of a tubular solar collector 10, said metal having the following composition:
[0089]
[0090] Apart from unavoidable impurities, the remainder consists of iron. This composition satisfies the following conditions:
[0091] 45.5≤(Ni+Co)≤46.5
[0092] (Ti+Ta+Zr)≥4×C
[0093] Thus, after subjecting the metal to an oxidation process at 900 °C in air for 20 min without prior decarburization in wet hydrogen, an assembly of joints is provided between the proposed metal and borosilicate glass . The oxidized metal and glass were directly welded by placing them in contact at 800°C for 15 minutes and cooling the joint to ambient temperature under controlled conditions with a gradient of 1°C / min.
[0094] One joint from the assembly of metal-glass joints thus provided was subjected to metallographic analysis by cross-sectional observation to verify the possible presence of air bubbles in the glass an...
Embodiment 2
[0099] According to the invention, a metal is provided for a metal-glass joint of a tubular solar collector, said metal having the following composition (the composition actually used in the examples is presented):
[0100]
[0101] Apart from unavoidable impurities, the remainder consists of iron.
[0102] This composition satisfies the following conditions:
[0103] 45.5≤(Ni+Co)≤46.5
[0104] (Ti+Ta+Zr)≥4×C.
[0105] There is also provided a glass for use in a metal-glass joint of a tubular solar collector, said glass having the following composition:
[0106] B 2 o 3
Al 2 o 3
Na 2 o
K 2 o
CaO
Fe
12.3
6.8
6.8
2.5
0.5
200ppm
[0107] Except for unavoidable impurities, the remainder is SiO 2 .
[0108] Thus, after subjecting the metal to an oxidation process at 950 °C in air for 10 min without prior decarburization in wet hydrogen, an assembly of joints between the proposed metal and g...
Embodiment 3
[0114] According to the invention, a metal is provided for a metal-glass joint of a tubular solar collector, said metal having the following composition:
[0115]
[0116] Apart from unavoidable impurities, the remainder consists of iron.
[0117] This composition satisfies the following conditions:
[0118] 45.5≤(Ni+Co)≤46.5
[0119] (Ti+Ta+Zr)≥4×C
[0120] There is also provided a glass for use in a metal-glass joint of a tubular solar collector, said glass consisting essentially of:
[0121] B 2 o 3
Al 2 o 3
Na 2 o
K 2 o
Fe
TiO 2
ZrO 2
Ta 2 o 5
CeO 2
Ba
9.8
6.2
5.9
3.8
200ppm
1.2
1.3
1.2
1.5
1.0
[0122] Except for unavoidable impurities, the remainder is SiO 2 .
[0123] Thus, after subjecting the metal to an oxidation process at 850 °C in air for 40 min without prior decarburization in wet hydrogen, an assembly of joints between th...
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