Solar energy is the energy produced by the continuous nuclear fusion reaction process in the sun's interior or on the surface of the sunspot. The average intensity of solar radiation in earth orbit is 1367w/ square meters. The circumference of the earth's equator is 40000km, and it can be calculated that the earth's energy is up to 173000TW. The standard peak intensity at sea level is 1kw/ square meters, the annual average radiation intensity of the earth's surface at a point 24h is 0.20kw/ square meters, the equivalent of 102000TW energy, human beings rely on these energy to survive, including all other forms of renewable energy sources (geothermal resources except), although the amount equivalent to the solar energy resources the use of human energy ten thousand times, but the solar energy density is low, and it varies from place to place, from time to time change, this is the main problem facing the development and utilization of solar energy. These characteristics of the solar energy will limit its role in the overall energy system.
Although the energy of the solar radiation to the earth's atmosphere is only 2 billion 200 million of the total radiant energy, it has reached up to 173000TW, that is to say, the energy that the sun irradiates to the earth per second is equivalent to 5 million tons of coal. Wind energy, hydro energy, ocean thermal energy, earth wave energy and tidal energy as well as some comes from the sun; even the earth's fossil fuels (such as coal, oil and natural gas) is fundamentally since ancient times the storage of solar energy down, so by including a broad range of solar energy is very righteous a large, narrow sense is limited to solar radiation can directly convert solar thermal and photovoltaic and photochemical.
Solar Energy (solar energy), usually refers to the radiant energy of the sun's light, and is generally used as a generation of electricity in modern times. Since the formation of the earth's life is mainly based on the heat and light provided by the sun, and since ancient times, people also know how to dry objects in the sun and preserve food, such as salt and salted fish. But with the reduction of fossil fuels, the solar energy is further developed. The use of solar energy has two ways of passive use (photothermal conversion) and photoelectric conversion. Solar power generation is a new renewable energy. Solar energy in the broad sense is the source of many energy on the earth, such as wind energy, chemical energy, the potential energy of water and so on.
With the increasing poverty of the earth's resources, the investment cost of basic energy is increasing, and the hidden dangers of security and pollution are everywhere. In this way, solar lighting products should be born after the popularity of solar water heaters. Here we will make a practical contrast between the effects of solar lamps and the use of municipal lamps.
* compared with the installation of electric lighting fixtures in a city, there are complex operation procedures in the city lighting and lighting engineering. First, we need to lay cables. There are a lot of basic works such as the excavation of the cable trench, the laying of underground pipes, the penetration and backfilling of pipes. After a long time of installation and debugging, if any line has problems, it should be reworked in a large area. Moreover, the requirements of the terrain and the lines are complex, and the cost of artificial and auxiliary materials is high. The installation of solar lighting is simple. When installing solar energy lamps, there is no need to lay complex lines. Just make a cement base and then fix it with stainless steel screws.
* compared with the two cities, the electricity consumption of electric lighting fixtures is high: there is a high electricity charge in the operation of lighting fixtures, and the maintenance and replacement of lines and other configurations must be carried out for a long time. The maintenance cost is increasing year by year. Solar lighting lamps and lanterns exemption: solar lighting is a one-time input, without any maintenance costs, three years can recover the investment cost, long-term benefit.
* compared with the three cities, there are hidden dangers in electric lighting: the lighting of municipal lighting has brought many hidden dangers in terms of construction quality, renovation of landscape lighting, aging of materials, abnormal power supply and conflict between water and electric pipelines. Solar lighting has no security risks: solar lamps are ultra low pressure products, safe and reliable operation.
Other advantages of solar lighting: green environmental protection, can add new selling points to the development and popularization of noble ecological areas, and reduce the cost of property management and reduce the cost of public sharing. To sum up, the inherent characteristics of solar lighting, such as safety, no hidden trouble, energy saving, no consumption, environmental protection, easy installation, automatic control and maintenance free, will directly bring obvious advantages to the sale of real estate and the construction of municipal engineering.