If the support can be disassembled and becomes iron bars after disassembly, it is recommended to classify it as 7214 (hot-rolled bars) or 7215 (cold-rolled bars)
If the support is formed in one go, that is, it is non-detachable and it is recommended to be classified as 7308 iron structure.
It is not recommended to be classified as solar part according to the general rules of classification, solar. The supports do not participate in the solar energy conversion process, meaning that without this support your solar converter will still be able to function and therefore cannot be classified as a solar part. If you encounter an inspection, you could be in trouble.
Can oxalic acid be used to clean the inside of solar vacuum tubes?
Solar water heaters will break down if not used for a long time. However, this has little to do withc the opportunity to use it or not. Any item will experience wear, aging and loss through use or non-use. This is a natural law. Nothing is permanent and permanent, and solar water heaters are no exception.
1. Since the important part of the solar water heater is the sealing ring on both ends of each pipe, it is the key to knowing whether the solar water heater is leaking. The seal ring is made of polyurethane, which is easy to age and shrink. Whether the sealing ring is used or not, it is exposed to the explosion of the sun and there is a risk of leakage. time.
2. Solar heaters use tap water, which is hard water, whether used or not, the vacuum tubes scale, leading to low thermal efficiency and being discarded over time. In summary, solar water heaters will break down, but that has nothing to do with improper use.long-term ation.
3. If the solar water heater will not be used for a long time, close the water supply tap, drain the water from the solar water heater, and then cover the vacuum tube with a cover to prevent the vacuum tube from dry out and reduce its lifespan.
Detailed information;
Solar water heaters are composed of several vacuum tubes, which have high thermal efficiency and are easy to operate. Its appearance not only makes life more convenient, but also saves a lot of energy. This has nothing to do with non-use or long-term use. Especially in winter in the north, if there is a power outage, the automatic heating system will not work. Vacuum tubes freeze and crack easily. The phenomenon of freezing and cracking of vacuum tubes is very common.
A solar water heater that has not been used for four yearscan ns still be used?
Probably not. 1. The acid contained in oxalic acid is not strong enough to corrode the scale in the vacuum tube. 2. Solar cells contain stainless steel parts, and oxalic acid cannot completely corrode scale. But it can corrode the stainless steel parts inside. 3. It is recommended to ask a specialist solar cleaner to clean it. Or buy a sunscreen cleanser.
It's hard to say: if the inner tank of the solar water tank is relatively thick, there should be no major problems using it now. If the inner tank is too thin, solar water tank may occur. flee. As for the leaking water line, simply reconnect it. Try not to touch the solar water heater upstairs, as some parts are seriously aged. If bad comparisonSeriously you can find a revenlocal solar heater for repair, because the specifications of solar water heaters on the market conform to national standards, which means all solar parts are universal.