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What is solar energy?
The nuclear reaction of fusion of hydrogen into helium is going on inside the sun, constantly releasing huge energy and constantly radiating energy into the universe. This is solar energy. The total amount of solar energy is very large. The solar energy received by my country's land surface every year is equivalent to 170 billion tons of standard energy. Moreover, this nuclear fusion reaction inside the sun can last for a long time. It is estimated to be several billion to tens of billions of years old. Compared with the limited survival of human beings, solar energy can be said to be inexhaustible.
Human Environment Energy and Solar Energy
A society that can sustainably develop should be one that can meet the needs of the present without endangering the future of future generations. Therefore, saving energy and using as much clean energy as possible is one of the basic principles that environmental construction must follow. At present, environmental pollution problems have increasingly seriously affected our life, health and safety. Coal accounts for a large proportion of energy consumption and is the main source of air pollution. According to testing, each square meter of solar water heater can reduce the emission of harmful compounds caused by coal burning into the atmosphere during its life cycle. Therefore, the development and utilization of solar energy is an important choice to reduce environmental pollution. After the United Nations held the Global and Environmental Development Conference in 1992, many countries have included solar energy in key development projects.
Energy is the material basis for human survival. The worldwide energy crisis since the 1970s has not only endangered future society but also seriously affected the production and life of today's society. The development and utilization of solar energy can be widely used in many aspects such as hot water, power generation, refrigeration, and heating. On the other hand, it can save a large amount of non-renewable resources such as petroleum and coal, which will greatly alleviate the serious problems caused by energy shortage. as a result of. As early as 1973, the United States formulated a government-level solar power generation plan, and then many countries formulated corresponding development plans. Prospects for Solar Energy Utilization in my country Our country has a vast territory, abundant solar energy resources and a good foundation for development and utilization. The total annual solar radiation in the country is between 3.8 and 8.4×10 kilojoules/square meter, accounting for more than two-thirds of the country's regions with annual sunshine hours of more than 2,000 hours. Wind energy, geothermal energy, ocean energy, etc. are also very abundant.
After years of hard work, solar thermal utilization has made gratifying progress. With the gradual improvement of products and the improvement of public awareness of civilization. With the development of the potential market in rural areas with a population of 900 million, the application of solar water heaters will see a large-scale progress. In the near future, a large-scale market similar to air conditioners, refrigerators, color TVs, etc. will be formed. Solar Energy Strategy For the country's environmental protection and energy conservation, in order to enter the international market and become a "major town" in the international solar energy industry, China must make rapid breakthroughs in solar thermal utilization and take a leading position in the world. This is our solar energy strategy.
A brief history of the development of solar water heaters
Solar water heaters are increasingly attracting attention due to their outstanding features of safety, energy saving, environmental protection and convenience. With the continuous breakthroughs in key technologies such as all-glass vacuum tubes and superconducting heat pipes in my country, the world's leading solar water heaters have achieved unprecedented rapid development, and their market development potential is also increasingly huge. After gas and electric water heaters, solar water heaters have become a new bright spot, and a tripartite situation of gas, electricity, and solar water heaters will soon be formed. The development of solar water heaters has gone through four stages: sun-drying type, flat plate type, glass vacuum tube type, and heat pipe vacuum tube type.
The first generation: sun-drying style. It was used 20 years ago in my country's northwest and other regions with long sunshine hours, but has now been eliminated.
Second generation: tablet type. It has been gradually eliminated due to problems such as poor anti-freeze effect, large heat loss, easy scale accumulation, low thermal efficiency and short service life. Because of its low manufacturing cost, it still has a certain market in engineering projects.
Third generation: all-glass vacuum tube type. It has high heat collection efficiency, good thermal insulation performance, and can withstand hailstones with a diameter of 25 mm. It is suitable for use in areas with temperatures above -25°C. The cost is moderate. However, due to the long-term heating of water in the vacuum glass tube, there is a possibility of water leakage and scale formation.
Fourth generation: heat pipe vacuum tube type. Our country adopts the advanced heat conduction technology used in aerospace and artificial satellites in the United States, combines super heat pipes with all-glass vacuum collector tubes, and develops a new generation of heat pipe vacuum tube solar water heaters with fast heat conduction and high thermal efficiency, especially suitable for sunlight Areas with insufficient or short sunshine hours per day. The vacuum tube is impermeable to water, does not scale, has strong anti-freeze ability, good thermal insulation performance and long service life, and is the new favorite in the market.
Solar water heater technical performance
Solar water heaters have attracted worldwide attention due to their advantages such as economy, energy saving, environmental protection, safety, convenience and large water supply. With the continuous breakthroughs in key technologies of solar water heaters, solar water heaters have been widely used in homes, factories, mines, hotels, schools, special hospitals, and other places where hot water is needed for showering, washing, and other places.
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