Friend, your hole is the exhaust hole. It should not be blocked, when using water, negative pressure will form in the water tank, which will deflate the water tank and then the water tank. will be scrapped. Does your solar system use a fully automatic water supply system? If water leaks from this hole, the sensor is broken. Simply replace the sensor.
The three-level multi-cavity technology vacuum collector tube is almost the latest technology at present. The Four Seasons Pastoral is on par with the three-height multi-chamber technology and is unlikely to surpass it. It's at least one level lower.
Multi-cavity technology vacuum collector tubes, to put it bluntly, add a core to the existing vacuum tube. This has nothing to do with actual absorption of sunlight. However, there are downsides to this afterwards. used duringa long time and is more likely to explode. Siji Muge aerospace tubes are different from other vacuum tubes in terms of the absorption level of the glass tube. The sunlight absorption effect should be better. Now the solar industry is imitating the color of Siji Muge's aerospace tubes, which proves that this tube should do it. be good, or it can be The Siji Muge brand has great influence and is imitated by many.