When people come to the solar energy mall to purchase solar energy, the salesperson will introduce the advantages of their own solar tubes to you. They will tell you that their tubes are the best in the mall, the three high tubes, and show you the colors on the inner walls of the tubes. Then they will praise the solar energy industry as a whole, and some will even belittle their peers. On the surface, they can inform you of the common knowledge of solar energy and consider your interests thoroughly. The work is not that simple. The important secrets here can be understood by you alone.
       Starting with the vacuum tube of solar energy, the important goal of vacuum degree is something that you cannot see. People can only see tangible objects, and the difficult goal of vacuum degree cannot be seen. Even with scientific instruments, it may not be so simple to test. If you only listen to the salesperson's one-sided words, then you will suffer a big loss. The essence that has been bought but not sold since ancient times. If you accidentally step into the territory of small and miscellaneous brands, they may say to you: solar energy is actually very simple, it is used for heating water. No matter how good the pipes are, they cannot be used for a lifetime. Big brand solar energy can only be used for 10 years at most, and my solar energy can be used for 10 or 8 years without any problem (I'm afraid he himself wouldn't believe this sentence after saying it), and our solar energy is much cheaper than theirs (this sentence is true). This statement is intended to deceive consumers' ignorance. If solar energy is compared to a car, then the vacuum tube is the engine of solar energy. What would happen if your car lacks power or undergoes frequent repairs? The solar vacuum tube is like an elongated thermos, composed of two layers of glass with a vacuum gap between them. So why is the service life of the coating related to the vacuum degree? Solar energy is placed on the roof every day, undergoing tests from wind, rain, and sun exposure. The main components of the coating in the vacuum tube are: aluminum nitride (anti reflection layer), copper (metal reflective layer), stainless steel or aluminum metal ceramic (absorption layer). In other words, the main component of the vacuum tube coating is metal. We have all learned chemistry in high school and know the elements of metal oxidation: moisture, oxygen, temperature. If the vacuum degree is not cleaned up, there will definitely be residual air inside, and the air is rich in oxygen and moisture. Although not a lot, it requires several years of ups and downs. After a little oxidation every day for a long time, the coating will be completely destroyed.
       The second issue is the poor insulation effect, which also touches upon the physics we learned in middle school. We all know that the sound we hear and the temperature we feel are conveyed by air. Assuming our living environment is vacuum, there will be no natural wind, rain, or wind. The same goes for vacuum tubes. If the vacuum degree target of the vacuum tube is not sufficient, then when the outdoor temperature is lower than the internal temperature of the vacuum tube, the heat of the vacuum tube will be transferred to the atmosphere, and the insulation effect will be greatly reduced。
       Finally, let's talk about the issue of refraction. For example, if the atmosphere we live in does not have an atmosphere or ozone layer, would the temperature we feel now still be like this? The answer is definitely not, it could be several times higher. So, applying this reality to the vacuum degree we are discussing today is also reasonable. Don't underestimate this residual gas. For example, a butterfly in the Amazon River in South America accidentally stirred up its comrades, and the famous butterfly effect was born. At this point, we may say that I made a mountain out of a molehill, but let's recall that every mistake gradually evolved from some small details that you don't care about. Details determine victory or defeat, and solar energy cannot escape this law.