U-pipe solar collector
1.there is no water in vacuum tube,the system can work as usual even if one tube is broken.
2.operation fluid pressure:0.7Mpa
3.test pressure is 1.0Mpa
4.it is connected with exsited tank in the basement
5.the frame is for flat roof and inclined roof.
6.U-type heat pipe could heat the water more quickly.
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