1. At present, the solar water heater with the highest technical level is the vacuum collector tube solar water heater. Based on the principle that hot water floats and cold water sinks, the water in the vacuum tube absorbs solar energy and heats the water in the water storage tank through temperature difference circulation.
2. Advantages: safety, energy saving, environmental protection and economy. Especially the solar water heater with auxiliary electric heating function, which takes solar energy as the main energy source and electric energy as the auxiliary energy source, can be used all year round.
3. Disadvantages: complicated installation. If improperly installed, it will affect the appearance quality and appearance of the house; Maintenance is more troublesome, because solar water heaters are installed outdoors, mostly on the roof and roof, so it is more difficult to maintain than electric water heaters and gas water heaters.
Air source water heater
. In fact, air source heat pump is a very simple product, which mainly adopts the reaction principle of air conditioning. At present, it has been recognized by some consumers because of its installation advantages. But up to now, the whole industry of air source heat pump has a short development time, no national standard, immature technology in all aspects, insufficient testing and unstable quality and performance, which often leads to various unexpected hidden dangers in the use of products. Automatic running time, natural cost saving.
1, advantages:
(1) Super-large water volume: The water tank capacity is tailored according to specific requirements, and the water volume is sufficient to meet the needs of different customers at different times.
(2) Economic saving: a large amount of energy is obtained from the air, and the energy efficiency ratio is as high as 300% ~ 400%. According to the usage rules, hot water (3) has a wide range of applications: it is not affected by rainy weather and other climates, can work normally at the ambient temperature of-10℃ ~ 43℃, and can be widely used for central heating in homes, hotels, hotels, schools, hospitals, dormitories, residential quarters, saunas and so on.
(2) Disadvantages:
(1) Because there is no industry standard in China, the manufacturers of air source heat pump water heaters are not large, most of them are assembled and branded, and the products are similar, so there is no so-called brand.
(2) The quality varies greatly. Some manufacturers cut corners and compete by price. For example, some manufacturers replace the copper pipe connecting the copper pipe with the copper pipe of the water tank with aluminum pipe, and the compressor is made in China.
(3) Compared with other water heaters, the price is higher.
(4) Large volume and limited installation places. The external machine can only be installed outside the balcony and toilet, and the distance between the external machine and the water tank cannot exceed 3 meters.
(5) The compressor is prone to aging and carbonization under long-term high temperature and overload. In addition, the lubrication effect of the system is not good and the compressor is easy to burn out. Generally, it cannot be used for 2-3 years, and the service life of the whole machine is short.
(6) In spring, autumn and winter, the use effect of air source heat pump will be obviously reduced, especially in winter, the ambient temperature is low, it is easy to frost, and the thermal conductivity is reduced. Frequent use of electric heating increases energy consumption, and the extra cost brought by defrosting increases the user's use cost.
(7) The outlet water temperature of air source heat pump is usually controlled at 50-60 degrees Celsius. In this temperature range, water is most likely to scale and produce anions. After a long time, the liner is easy to corrode, rust and leak.
(8) The air source heat pump always uses electric energy to maintain its work, which consumes a lot of electricity and increases unnecessary costs for users.