Solar definitions and technical performance of
What is solar energy?
Within the sun together with the hydrogen nuclei into helium reactions, constantly releasing tremendous energy, space radiation energy to keep, which is solar energy. Large amount of solar energy, China\\ s land surface is necessary when the solar energy each year at 170 billion tons standard of energy. And this fusion reactions inside the sun can be maintained for a long time. An estimated several billion first billion years. Limited relative to the survival of mankind, the solar energy can be said to be inexhaustible.
Solar energy and human environment
A sustainable development of society should be that meets current needs without compromising future generations of society. Therefore, energy conservation, as much as possible with clean energy and environment must be one of the basic principles. At present, environmental pollution has become increasingly serious impact on our life and health and safety, including coal in energy consumption account for a large proportion is the main source of air pollution. According to testing, each square meter of s in their lifetime may be caused by burning coal to reduce emissions to the atmosphere of harmful compounds. Thus development and utilization of solar energy is an important option to reduce environmental pollution. 1992 United Nations convened the Global Development and Environment Conference, many countries have included the focus on developing solar energy projects.
Energy is the material basis of human survival, since the 1970s, global energy crisis, not only endanger the future of society and seriously affected the production and living in today\\ s society. The development and utilization of solar energy, on the one hand can be widely used in hot water, electricity, refrigeration, heating and other aspects, on the other hand can save a lot of non-renewable resources such as oil and coal, will greatly ease the energy shortage and the serious the consequences. As early as 1973, the U.S. government on the development of a class of photovoltaic power generation project, then many countries have developed a corresponding development plans. Prospects for solar energy utilization in China China has a vast, rich in solar energy development and utilization of resources and a good foundation. Total in the National Solar Radiation 3.8 ~ 8.4 × 10 kJ / sq m, accounting for about 2 / 3 of the region greater than 2000 hours of annual sunshine hours. Wind, geothermal, ocean energy, are also very rich.
After years of effort, solar thermal has made gratifying progress. With the gradual improvement of the product, the public awareness of civilization. Has a potential market of 900 million people of rural development, application of solar water heaters will be a large-scale progress in the near future will form an air-conditioning, refrigerator, color TV, like the mass market. Solar energy strategy for the country\\ s environmental protection cause, to one of the world market and become an international solar energy industry, \"city\", China must quickly use of solar thermal break and a world leader. This is our solar strategy.
A brief history of solar water heaters
Solar water heaters for its safety, energy saving, environmental protection, to facilitate the salient features of increasingly high-profile. As China\\ s all-glass vacuum tube and heat pipe technology continues to break the key, the world\\ s leading solar water heater made an unprecedented rapid development, increasing its market potential is huge. Following the gas, electric water heater, the solar water heater has become a new bright spot, gas, electricity, solar water heaters, three kinds of \"three pillars\" situation will soon be formed. The development of solar water heaters, has gone through four stages: nausea drying-type, flat, glass vacuum tube type, heat pipe vacuum tube.
The first generation: nausea drying type. 20 years ago, long hours of sunshine in our other areas of the Northwest, has now been eliminated.
The second generation: flat. Poor results due to frost, heat loss, easy to plot scale, low thermal efficiency and short life problems have been gradually phased out. Because of its low manufacturing cost, the project is still in a certain market.
The third generation: all-glass vacuum tube. High collection efficiency, good insulation properties, can be anti-diameter of 25 mm hail attack, for temperature above -25 ? for use. Moderate cost. However, due to the vacuum tube through a long period of water heating, there is leaking, furring possible.
The fourth-generation: heat pipe vacuum tube. China\\ s use of the United States used in aerospace, satellite-based advanced thermal technology, the super heat pipe and all glass vacuum tube combination, developed a new generation of heat pipe , fast heat conduction, thermal efficiency, especially for the sun inadequate or short daily duration of sunshine the area. Vacuum barrier of water, no scaling, antifreeze ability, good insulation properties, long life, is a market darling.
Technical performance of solar water heater
Solar water heaters for its economic, energy saving, environmental protection, safety, convenience, water volume, etc., has attracted worldwide attention. As the key technology of solar water heaters continue to make breakthroughs, solar water heaters have been widely used in households, factories, hotels, schools, military units, hospitals, etc. for the shower, hot water wash, and other required places.