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Stainless steel tanks used in flat panel solar water heaters
2015-07-13 17:05  点击数:
China's solar water heater market, the current vacuum tube water heater has an absolute advantage is an indisputable fact, but also extremely strong development momentum, the outlook is even more charming. But I can not ignore the flat water heaters in recent years, becoming the highlight of the show is the new darling of the mainstream domestic users, and international market, and was even some experts and scholars believe is the future direction of the solar water heaters. If I were complacent in size and level of vacuum heater, rather than to study the advantages and development of flat panel solar water heater seriously, it is impossible to look long-term and seize the future, to grasp the initiative to enter the international high-end market.
 
First, the basic structure of flat solar water heater
 
Flat-plate solar water heater is mainly composed of flat plate collectors, storage tanks, pipes, brackets and accessories section. Flat plate collectors are the key component water heater, its thermal performance is an important indicator of the level of the quality of the water heater. Including coated with a selective absorbing coating of the absorber plate, translucent material cover, insulation and outer casing of four parts. When the sun shine through the glass cover in the flat plate heat, most of the solar radiation absorbed by the absorbent body, into heat, and transfer to the working fluid in the fluid passage. By natural circulation or forced circulation, while the water is heated stainless steel tank.
 
Absorbing board information abroad basically copper and stainless steel, the country has a lot of use of copper, aluminum, steel, galvanized sheet, poor water quality in coastal areas, you can use plastic or glass instead. Because high reflectance metal surface, the absorption rate is low, in order to enhance the absorption effect, it is necessary in the metal surface coating that is heat-absorbing plate preparation. Preparation process is different from the coating can be divided into the plating coating, electrochemical conversion coating, vacuum coating coating and paint coating four main forms. Because the collector is surrounded by air, so when the collector absorber plate in the transformation of solar radiation energy to heat water, but also the heat dissipation to the surroundings, which makes solar radiation energy can not be completely converted into heat water. In order to reduce this energy loss, the absorber plate installed above the translucent material cover, the cover sheet and not through the far infrared through visible light, thus reducing energy loss, more effectively improve the absorber plate and the water temperature. Quality translucent material cover has a great influence on the water heater's efficiency and lifespan.
 
Cover material currently used at home and abroad mainly ordinary sheet glass, glass and fiberglass, among the most widely used or tempered glass. The sides and bottom of the absorber plate placed insulation materials, to reduce the loss of heat to the collector surrounding environment in order to improve the efficiency of the collector. Commonly used insulation materials have rock wool, mineral wool, polystyrene and polyurethane, etc. Polystyrene shrinks at higher temperatures, so when you use it for insulation material, often between the absorber plate to put a thin layer of rock wool or mineral wool. For the absorber plate, the translucent cover and the insulation layer to form a whole, and to maintain a certain degree of stiffness and strength for easy installation, you need to have a more solid appearance of the shell, usually with aluminum, steel, plastic, glass, etc. made . In addition, there are flat-plate solar water heater tank insulation, brackets, pipe fittings and other structural elements extremely.
 
Flat Plate Solar stainless steel water tank
 
Second, the development of flat panel solar water heater
 
Flat panel solar water heater development of the country experienced a "U-shaped course, and now gradually rise in the new starting point, has aroused great concern of experts and scholars and the business community. According to the data indicate that in 1997 the annual output of solar water heaters 3.5 million square meters, of which about 45% of flat solar water heater vacuum tube water heaters account for about 30% of the proportion of flat plate solar water heaters in 2001 dropped to 26.3% and increased to 63.2% of the vacuum tube water heater As of now, continued to decline after nearly 10 years, State flat solar water heater production share of only about 90 percent of it, however, on the international market, flat-panel solar water heater has always been the dominant products abroad (such as Japan and the United States) for more than 90% of the solar hot water systems use flat solar collectors, even in the very cold winter in Denmark, Sweden and other Nordic countries are no cases.
 
State authorities on the development of the global solar water heaters were analyzed. By statistics in Europe, 21 countries in the Americas, Oceania and Asia, the 433 solar energy companies, there are flat-plate solar water heater 401, accounting for 92.61% of the total enterprises in the vacuum tube solar water heater 12, accounting for 2.77% of the total enterprises Simple Solar water heater 20, accounting for 4.62% of the total enterprises Clearly, foreign applications of solar water heaters, solar water heater production enterprises tablet is far greater than the number of other types of products enterprises. With the promotion and popularization of new energy sources, as well as progress and development of science and technology, technical level and product performance flat solar water heater country, the quality is also increasing from time to time, and exhibits unique advantages in many aspects of the development of integration and so on. One of the 2008 Beijing Olympic Games project "Olympic Village" large-scale solar hot water system tender, chose the German production of flat plate solar collectors, so our vacuum tube solar water heater manufacturers have to reflect on your breath.
 
March 6 this year, the sixth China Solar brand products Expo, Haier Australia winning ten thousand square meters of solar flat plate collectors become the largest single arouses jealous news. Haier Group from Germany to introduce advanced flat-plate collector technology, developed for the Chinese market high-temperature flat plate solar collectors, flat plate solar victory solves insulation, sealing and other industry problems. Sun, rain, Aucma and other domestic brands have also invested flat solar water heater project. After the solar water heater industry and the construction industry to work together, the country is moving from the bottom plate solar water heater to a new stage of development.
 
Third, the flat panel solar water heater Advantages
 
Flat panel solar water heater after decades of development, technology has become more mature and perfect, and have other types do not have the advantage of solar energy characteristics.
 
One especially suitable for building integration requirements. Flat plate solar water heater because of its structural characteristics, building integrated solar energy applications, the flexible structure of arbitrary shape, form or size from the design constraints, and easy to implement in conjunction with building elements. Coupled with its collector plate is made of metal, can easily use the knot, welding and other connections, for the installation, maintenance and use provided lunch.
 
Second, with high thermal efficiency. Because vacuum tube solar collector is the existence of a gap between the tube composed by a number of vacuum tubes, when exposure to sunlight, a partial solar collectors have not been accepted. Flat plate solar collector is a continuous plane, the entire surface of the collector can accept sunlight. Therefore, under the same lighting area and sunlight intensity, the average efficiency of flat plate solar water heater vacuum tube solar water heaters are generally higher than the daily average efficiency over 6%.
 
Third, a good performance under pressure. Since the flat plate solar collector absorber plate is made of metal material collector and stainless steel holding tank is connected also with metal parts, therefore, accept from the pressure of the water and circulation pump.
 
At present, rural water supply systems are generally centralized, high water pressure, which requires out of the hot water from the solar water heaters have a certain pressure, thereby reducing the pressure heater outlet and water outlet between the User convenience and comfort. Fourth, when the composition of a large system performance and stability. For some large sites, such as hotels, swimming pools, factories and other places, the use of solar water heaters, often requires large-scale water supply system consisting of many solar collectors. If using flat plate solar collectors, between the collector and the system is connected with the metal, rather than with vacuum tube solar water heaters, as with rubber and plastic parts connected, we can guarantee the stability of the entire system.
 
Therefore, the establishment of large-scale solar water heating systems, often using flat plate solar collectors. In addition, because of its simple flat plate solar water heater structure, easy to process and easy to scale production, but also so that it has low manufacturing costs, installation costs provinces and long service life. Of course, the presence of high heat loss and freezing flat plate solar collectors and other issues also need to be further addressed through technological innovation. In order to actively participate in international competition, open up the domestic high-end market, the necessary attention to research and development of flat panel solar water heater, with a more open mind, improve the technological level and the international level of solar thermal utilization.
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