How can solar energy distinguish between good and bad?

it is absolutely right to identify and select solar energy according to such standards and methods! \xd\ Solar water heaters are large household durable goods, which may not be replaced for more than ten years once they are bought home. The materials, technologies and processes of solar water heaters are different, and their service life is 3 years or 5 years, and some can be used for more than ten years. As a hot water supply facility on the roof, the new and old solar energy does not affect the beauty of the room at all, so there is no need to worry about upgrading. Therefore, from the perspective of family investment, it is the most cost-effective to buy a solar energy with a service life of more than 1 years. \xd\ Vacuum tube, insulation layer, inner container and accessories are the main factors that affect the life of solar energy. \xd\ Vacuum tube: The vacuum tube is the core component of solar water heater, and its function is to convert the absorbed solar energy into heat energy and make the water in the tube warm up and circulate. The quality of vacuum tube directly determines the performance of the whole water heater. \xd\ Ordinary vacuum tubes have low vacuum degree, and low-power vacuum pumping units have short exhaust time, and the vacuum degree is only 1-1-1-2pa. Vacuum tube can't store heat for a long time, and after being placed outdoors for a period of time, its thermal insulation performance is not as good as that of thermos bottle. The coating technology is backward, coupled with the poor process, high emission ratio and large heat dissipation. For the same day, the amount of hot water is not half that of high-quality solar energy. \xd\ Himin vacuum tube has a high degree of vacuum. Using a high-power vacuum extractor, the exhaust time is long, and the degree of vacuum is as high as 1-4pa, which prevents gas molecules in the tube from conducting heat energy, and has obvious heat insulation effect and longer service life. Due to the patented interference coating technology, the absorption ratio of Huangming vacuum tube is as high as 96%, and the heat dissipation rate is extremely low; The film layer contains copper and stainless steel aluminum nitride, which has stable performance, high temperature resistance and cold resistance, and will not explode the pipe in the air. The heat gain of the three high-level managers manufactured by using the interference membrane technology is increased by more than 12%, and the heat collection performance is superior, and sufficient hot water can be provided in several cold days. \xd\ insulation layer: the insulation layer is the part between the outer skin and the inner tank of the water tank, and the performance of the insulation layer directly affects the actual amount of hot water available for solar energy. \xd\ Inferior insulation layer insulation materials are shoddy, and ordinary polyurethane is used, and even more, plastic foam is used. Only some polyurethane foam is used in the bare place where the vacuum tube is inserted. After a few months, the insulation effect plummets, and it is basically not insulated after one year. Ordinary polyurethane foaming machine is crude, without high-temperature curing treatment, using low-pressure foaming machine or manual foaming, the raw materials are mixed unevenly and the heat is lost quickly; Without high-temperature curing treatment, once the temperature rises, it will cause secondary foaming, bursting the shell of the water tank and cracking the inner tank. \xd\ Himin insulation layer adopts imported high-quality polyurethane, which has low thermal conductivity, high strength, good elasticity, low temperature resistance, easy molding and good heat insulation effect. The foaming adopts imported equipment, fully automatic constant temperature and high pressure quantitative foaming, and after high temperature curing treatment, the foaming material reacts fully, the density is 4kg/m3, and the closed cell rate is >: 92%, the cell distribution is uniform, the thermal conductivity is low, and the heat preservation effect is the best. \xd\ tank: The tank tank tank of water heater works in hot water environment for a long time, and the tank should have sufficient strength and durability. \xd\ The inferior liner material is not anticorrosive and the thickness is not enough. The SUS43 stainless steel or stainless iron they used has low nickel content, which plays a key role in corrosion protection, and it is easy to rust and crack in hot water environment. The thickness is only .2-.3mm, which is neither high temperature resistant nor easy to leak. Backward welding technology, manual or semi-manual welding, the welding area is easy to produce point or gap corrosion, resulting in water leakage. After a few years, with the increase of corrosion area, the liner is basically scrapped. \xd\ Huangming liner is made of imported thickened SUS34 stainless steel (high chromium and high nickel, with a thickness of .5-.6 mm), which is durable and has strong corrosion resistance. The liner treated with automatic argon arc welding equipment can not only significantly improve its corrosion resistance, but also has long service life under high temperature. \xd\ Accessories: A good solar water heater must have a good pipeline transmission system to match the quality and performance of the main engine. \xd\ Inferior fittings are patchwork, the quality is not guaranteed, the pipe fittings have poor resistance to cold and hot shocks, and are easy to freeze crack and rust. The leakage flooded the floor furniture and even destroyed the neighbor's decoration. When there is a problem with inferior parts, especially when it causes great economic losses, no one cares about the manufacturers, and consumers have no way to complain. The installation of insulation is not standardized, and plastic foam is used as the insulation layer of the pipeline. When the weather is cold, the water pipe leaks after freezing and cracking, destroying the house and causing neighborhood disputes. The installer is unprofessional, improvising and without qualification certificate. \xd\ Himin uses uniform original parts, and the manufacturer is responsible for the end. Produced by professional manufacturers, specially designed for solar water heater pipeline. The pipe fittings have good sealing and corrosion resistance, no corrosion and no leakage, good cold and hot shock resistance, strong bearing capacity and long service life. Manufacturers are responsible for the quality and service of accessories. \xd\ At the same time, the accessories have been strictly tested, and Huangming has a special accessories laboratory to test the working conditions of aluminum-plastic pipes, valves, pipe fittings, water nozzles and other accessories in different environments, and only those that pass the test are allowed to use. Multi-protection of pipeline insulation, polyethylene insulation pipe, aluminum foil and electric heating belt (special for the north) triple insulation measures, the pipeline is like wearing a high-quality down jacket, and the pipeline is not frozen in winter. Huangming's installers have qualification certificates, and work with certificates to ensure the installation quality.