Solar vacuum tubes have a 30-year history in China. The main function is to absorb solar energy and convert it into thermal energy. If you want to know more, there is a corresponding national standard, 17049-2005.
It is widely used as the main component of low temperatures. high temperature hot water projects in the market. In the development process, all large and small companies in the solar energy and low temperature hot water industry are developing their own products, hoping to differentiate themselves. Therefore, many new product names were born as a result, such as purple gold tube, three-tube tube, high-efficiency tube, three-target tube, super cold tube and various data collection tubes. energy, of which the titanium tube is just one of them.
The so-called differences are still different in terms of processes, materials andt further research and development at the beginning, but they are basically common at a later stage. Some of them are just not worth mentioning. the name, and they're not necessarily much better than regular vacuum tubes.
In the literal sense of the surface of the titanium tube, the heat-absorbing film layer (selective absorption coating) should be added with titanium metal or titanium oxide. Titanium oxide has certain metallic properties. is resistant to high temperatures and is not easily oxidized in the vacuum environment of a vacuum tube, it is relatively stable and not easy to rot under high temperature conditions for a long time.
But ordinary vacuum tubes are very cheap, and titanium targets are too expensive. I know of only one major manufacturer that added titanium during their mid-high vacuum tube researche temperature. and titanium are widely used in the heat-absorbing film layer of flat plates. The reason is that flat plates convert heat at high temperatures in a vacuum-free state. The addition of metallic titanium and its oxides makes the film layer more stable.
The poster therefore made its own projection. Due to cost-effectiveness, I don't think it is necessary to choose expensive titanium vacuum tubes for hot water projects using ordinary low temperature vacuum tubes (don't do it). mention if it is just a gimmick).
Should we use PEX pipes for solar sewer lines or aluminum-plastic pipes to resist freezing in winter?
Use aluminum-plastic pipes for solar hot water at 100 degrees. The long-term use temperature is 95 degrees, 50 years, IMPa, the use temperaturemaximum tension is 110 degrees, and the thermal expansion coefficient of the aluminum-plastic pipe is small. Its thermal expansion coefficient is equivalent to that of aluminum and only one-sixth that of all-plastic pipes. When subjected to temperature changes, the amount of deformation is small and the aluminum-plastic pipe is a flexible coil. The pipe itself can absorb a certain amount of deformation and will not cause thermal expansion or deformation of the piping system.
Aluminum plastic pipe, light weight, good heat resistance, corrosion resistance, low thermal conductivity, small pipe resistance, strong pipe connection, hygienic and non-toxic.
Uses of aluminum-plastic composite pipes
In hot and cold water piping systems, aluminum-plastic composite pipes are smooth to the interiorr, do not corrode, do not form scale and have a greater flow rate than 30/30 metal pipes.
It is easy to fold, can be installed directly on beams and columns and can be buried in walls and concrete. A simple metal detector can detect the installation location, which makes the pipe very suitable for industrial and industrial applications. Used in hot and cold water piping systems of civil buildings. With good hot melt performance, the hot melt connection connects pipes and fittings of the same material into a perfect whole, eliminating the risk of water leakage.
Aluminum-plastic pipes do not pollute the environment during use and are environmentally friendly building materials.
Generally, aluminum-plastic pipes are not used and the cost is high. Instead, the outside of the pipes should be covered with ainsulating layer. I will teach you a trick: install 3 pipes near the outlet of the solar sewer pipe. Connect: 1 solenoid valve, 2 connect to the water pipe, and 3 connect to the atmosphere in this way, when no water is used in winter. , close the solenoid valve, open the indoor faucet and drain the water into the pipe, so that the pipe does not freeze