Bottleneck leading to the development of solar water heater technology lag
[REVIEW] as a typical representative of a low carbon economy of the solar industry has become a recently concluded National "" hot topic, concern is that many traditional vacuum tube solar domestic enterprises have begun to quietly test the level of solar panels. The industry believes that, with the constant breakthroughs in key technologies, and building integrated solar domestic growing trend, was vacuum "suppressed" years of flat panel solar water heater is expected to usher in 2010, turning over the years.
As a typical representative of low-carbon economy of the solar industry has become a recently concluded National "" hot topic, concern is that many traditional vacuum tube solar domestic enterprises have begun to quietly test the level of solar panels. The industry believes that, with the constant breakthroughs in key technologies, and building integrated solar domestic growing trend, was vacuum "suppressed" years of flat panel solar water heater is expected to usher in 2010, turning over the years.
Technological bottleneck led to the development lag
It is reported that in the early 1980s, Yunnan, Guangdong and some enterprises have also introduced a flat solar products of foreign technology in the domestic production for sale. However, because these products are technically flat-defective, low quality, service and keep up with the late, large number of products on this "rotten" in the roof. It is also because of antifreeze, pressure and other key technical limitations, when the flat-plate solar water heater is only suitable for areas with better use of the environment, which also caused the company stick to the southern market, the marketing concept, not product innovation, market development inner power.
Trapped in the technical defects, quality problems and the use of time constraints and other factors, and Qinghua Sun, Temple, Emperor Ming, Li Norit, a large number of domestic solar water heater leader, are vacuum tube collector based products, which making the tube quickly captured the vast majority of domestic market share.
Beijing Solar Energy Research Institute of the original hope was that the Yangtze River, there are two major reasons for the flat plate solar water heaters in the country left out: First, China s solar water heater, whether domestic or collective use of the system (hot water works), has been used direct heating solar collectors heat water in the traditional way, flat plate solar collectors in the water to freeze not only affects the normal operation of the collector, and the tube leading to the split up. The vacuum tube solar water heater for the winter the water in case of not emptying the basic non-frozen or not frozen (special circumstances such as snow, cold may also be frozen), so by the market. Followed by the all-glass vacuum tube water heater production costs nearly 10 years significantly reduced. All-glass vacuum tube was reduced by 5 times, more than twice the lower tank. At the same time the production of flat plate solar collectors are not much lower cost.
Hu Guang-liang, chairman of Five Star Solar Energy Co., frankly, from the market in terms of applications and service objects, flat plate solar collectors used in large-scale projects an advantage; for household products, the domestic household products are generally direct heating, indirect heating applications small, flat-plate collector antifreeze higher prices, coupled with flat-plate in the home, the size range of options too, so the impact of the flat-plate collector on the market to promote speed.
Key technologies to be improved
The industry believes that, in the vacuum tube solar water heater popular, flat as a second-generation product technical defects do exist. "Over the last 10 years without significant progress, a considerable part of the product performance and quality is not satisfactory, basically still at the level of the 1980s." Engineer of Beijing Solar Energy Research Institute in Ho Chi said.
He Zinian that although China has developed a solar water heating systems for domestic national standards and technical conditions of the 1990s, also amended the relevant conditions for flat plate solar collector technology, national standards, but with the corresponding international standard or European standard contrast , there are still a large gap.
A home plate solar water heater business executives recognize that China flat water heater and one in the gap between the foreign absorbing coating, the second is in the control system, the third time in terms of solar efficiency.
Industry experts point of view is more consistent, flat water heater is the biggest technical problem antifreeze, which is affecting the area north of the Yellow River, especially in cold regions of the deadly bottleneck. In this regard, Jiang Xi was said that in the region below zero winter weather conditions, be sure to use antifreeze, water, secondary heat exchanger, "European household and collective use of the system (water works) is used in antifreeze pump drive plate solar collectors and thermal storage tank to cycle heat exchanger, which can be a fundamental solution of flat plate solar collectors and collectors of water frozen freeze problem, but a fundamental solution set of flat plate solar heat the water in the scaling problem. "
Second, to improve the flat solar collector thermal performance in efforts to solve the problem of low thermal efficiency in winter. "Effective approach is to use high performance selective coating absorber plate, to achieve high solar absorptance (90%), low infrared emission ratio (6%), but also solve the tube sheet heat exposure. Flat plate solar collectors device through the glass cover ratio should be high (90%) tempered plate glass, replace the low transmittance of ordinary window glass. "Jiang Xi was said.
Large-scale production in contrast
In addition to a breakthrough in flat panel technology, how like a vacuum tube mass production, reducing costs, and vigorously promote the adoption rate as civilian water heater is placed in front of flat panel solar water heater manufacturers grim topic.
In this regard, Hu Guang-liang said in an interview: "flat panel solar industry to achieve large-scale production would require the corresponding system can achieve the same production, such as building products, serialization, standardization is the first standardized the size of solar collectors, collector plates core parts, components can be produced according to uniform standards, construction, installation, inspection should also be uniform standards, specifications, products of different brands to achieve common, can really put solar construction, installation into the universal installation of the column, not only the scale of production can be realized, but also the market will regulate the development of rational, not only to ensure effective promotion of solar energy applications, and even make solar energy popular and achieve effective integration and architecture, and promote healthy and orderly development of the solar industry. "
As the promising prospect of flat water heater, solar shower, Aucma and other domestic brands have also invested plate solar water heater project. It is reported that Shandong Province, located in Jiaonan Haier solar water heater manufacturing plant, production lines have been adjusted, including the flat-plate collector production line, water tank foam line, pressurized spray tank production line and frame lines. "We only do solar hot water system specialists, we need to do panel of experts ." Haier said Zhou Qiang, director of solar energy planning.
"With the introduction of national policy and the needs of the domestic market and domestic large-scale solar panel manufacturer s efforts, China s solar panel will usher in a golden age." Hu Guang-liang said optimistically.