I believe that you are not unfamiliar with solar water heaters, which are very common in. It has the characteristics of energy saving, environmental protection, safety and health. So how to choose a suitable solar water heater? Let's have a look.
Pay attention to six standards in purchasing solar water heater
One is the durability standard: the material, technology and technology of the solar water heater are different, and the service life is also different. Some have been used for three or five 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 water heater does not affect the beauty of the room, and there is no need to worry about the issue of renewal. So when you buy, you should consider the long-term. You should think about the performance, specifications and functions. Otherwise, three years later, the solar water heater will be out of heat, backward function and other problems. It is not cost-effective to replace it. If it is not replaced, it will not be comfortable to use. So at the beginning of the purchase, we should measure it comprehensively to avoid regret after buying for a short time.
Second, the standard of heat collection: the vacuum tube is the heart of the solar water heater. The heat collection capacity of the vacuum tube is an important indicator to measure the performance of the water heater, and it is also an important factor affecting the heating capacity of the water heater.
At present, the patented three high vacuum tube coating technology is applied in the market, the vacuum degree reaches 10-4Pa, and the performance almost does not decline after more than ten years. The vacuum tube of inferior quality is used as the standard of thermos bottle. The vacuum degree is only 10-1-10-2pa. After three or five years, it will neither absorb heat nor keep heat, but only fill water.
The third is the standard of heat preservation: the water storage tank is the "hot water warehouse" of solar water heater, and its performance is mainly reflected in the insulation effect: the good insulation layer adopts imported raw materials, automatic constant temperature and high pressure quantitative foaming insulation process, and after high temperature aging treatment, the heat preservation performance is high and stable and lasting. The foaming of inferior insulation layer was uneven, and its performance declined sharply after two or three years.
Good solar thermal insulation materials and advanced insulation technology can ensure good thermal insulation effect. After one night, the temperature of hot water will drop less, and the hot water will still be used overnight.
Fourth, scale standard: ordinary water heaters can not meet the hot water demand of modern families in terms of hot water quantity, intelligent control degree, operation cost and water safety. The ideal water heater should not only solve the problems that ordinary solar water heater, gas water heater and electric water heater can not solve, but also meet people's demand for large amount of water, intelligent and free hot water.
The fifth is the cold tolerance standard: in winter, the sunlight is weak, the illumination time is short, the temperature is low, the temperature difference is big, the hot water demand is bigger, is the test solar energy key period.
Due to the limitation of technology, the former products are not easy to use in winter and rainy days. Now, with the invention of interference coating technology, the heat collection performance of three high vacuum tubes has been greatly improved. In addition, the application of automatic constant temperature and high-pressure quantitative foaming and insulation technology (which must be subject to high-temperature aging treatment) and comprehensive and strict outdoor pipeline insulation and antifreeze measures, solar energy can be used and easy to use in winter and rainy days. "Heat is the hard truth" has become the gold standard to measure whether solar energy is qualified or not.
In fact, the demand for hot water is more obvious in winter, especially when the weather is freezing. It is a dream of many families to have sufficient economic hot water, and this dream can be realized completely. When choosing solar water heater, we should not only pay attention to the heat collection performance and thermal insulation capacity of the product itself, but also see whether the installation is standard and whether the service is perfect.
Sixth, accessories standard: solar water heater is a heating water system, a good host also needs good auxiliary equipment and accessories to cooperate to achieve good use effect. The quality of the original accessories of the solar water heater should be matched with the main engine, which can not only guarantee the service effect and service life, but also solve the problems timely and effectively. Some businesses or users choose any kind of accessories to use in order to make it cheaper and easier. As a result, there are a lot of small problems in using, and some also cause huge losses, and no one can find them. A user in Northeast China lost more than 100000 yuan because he used inferior accessories and a big icicle formed by water leakage damaged his neighbor's Mercedes Benz.
Three key points of using solar water heater in summer
First, pay attention to the water supply time, never at noon. Because of the strong sunlight in summer, the temperature of the vacuum tube in the sun is as high as 270 ℃ ~ 400 ℃. At this time, it is easy to cause the vacuum tube to burst. Therefore, the water, must choose the morning or evening.
Second, according to the weather conditions, determine the amount of water, to ensure the appropriate water temperature when bathing. Look at the sky water: according to the weather forecast to determine the amount of water, you can get a more satisfactory water temperature. If it's sunny tomorrow, fill up the water; if it's cloudy or cloudy, fill up the tank with water; if it rains all day, keep the original water instead of cold water.
Third, regularly check whether the water heater pipes, vent and other components work normally. Regularly check the vent hole to ensure that it is unblocked, so as not to damage or shrink the water tank; when cleaning the vacuum pipe, pay attention not to damage the tip of the vacuum pipe; pay special attention to the water supply of the solar water heater with auxiliary electric heating device to prevent dry burning without water. In summer, there are many users to replace the water pipes of solar water heaters. Experts remind users to check whether the insulation layer of water pipes of solar water heaters is aged and cracked. If the water pipes are exposed, they will become hard and brittle, crack and leak under the sun. Users should install insulation layer and anti ultraviolet tape in advance to protect water pipes.
Advantages of solar water heater
1. From the appearance point of view, it is very in line with the appearance characteristics of the building, without the interference of the building form, and the components can be easily assembled and maintained.
2. The flat panel solar water heater has high thermal efficiency. The whole surface of the solar water heater is exposed to the sun, which can receive the direct sunlight to the maximum extent.
3. The key component of flat panel solar water heater is heat absorbing plate, which is made of metal. It can bear the pressure of water better in the process of transportation and installation or in use.
4. In a larger place, the large solar heating system is more stable, and the stability of the whole system will be greatly improved.
Disadvantages of solar water heater
1. The flat plate solar water heater is not suitable for use in the cold and easy to freeze area, and the freezing problem can not be well solved, so secondary heating should be adopted.
2. The solar panel core of the flat panel solar water heater is not vacuum, and the heat insulation effect is not very good. When it is outdoors, the heat dissipation is relatively fast and the temperature is low.
3. In winter, although the flat plate solar water heater has passed the secondary heating, there is a certain amount of heat loss due to the increased intermediate link.
