It's good that you have this idea. Solar energy is clean, non-polluting and inexhaustible, but have you thought about the cost? Solar power generation currently mainly uses solar panels, and the back end is also equipped with peripheral circuits such as batteries and inverters, which can cost at least tens of thousands or even hundreds of thousands of yuan.
At present, the use of solar energy by human beings is still in its infancy, and we look forward to the emergence of low-cost utilization methods in the future.
It must have been heated by the sun. Otherwise, why would the collector tube be black? Because black absorbs light and the heating function is infrared since the collector tube is a double layer vacuum? tube, the absorbed heat is not lost from the outer layer but transferred from the inner water layer to the reservoirsee internal with the thermal insulation layer. Therefore, the heat absorbed by the heat collecting tube can only enter but not exit. it therefore continuously absorbs heat to increase the water temperature.