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Advantages of solar energy As a new energy source, solar energy has three major characteristics compared with conventional energy sources. First, it is the most abundant energy source that humans can utilize. It is estimated that over the past billions of years, the sun has consumed its own energy. In the future, it will be enough to supply humans on earth for billions of years. It is truly inexhaustible. On the second earth, there is solar energy wherever it is, which can be developed and utilized locally without transportation problems. It is especially valuable for rural areas, islands and remote areas with underdeveloped transportation. Third, solar energy is a clean energy source. During development and utilization, no waste residue, waste water, waste gas, or noise will be produced, and it will not affect the ecological balance. Absolutely no pollution or public nuisance will be caused.
Technical fields of solar energy utilization Human beings only use solar energy in three major technical fields, namely photothermal conversion, photovoltaic conversion and actinic conversion. In addition, there is energy storage technology. Solar photoelectric conversion mainly includes solar panels and power supply systems of various specifications and types. A solar cell is a device that directly converts sunlight into electrical energy. The photovoltaic efficiency of solar cells is about 100%, and its product types mainly include monocrystalline silicon, polycrystalline silicon and amorphous silicon. The price of domestic products (referring to the total cost of photovoltaic devices) is approximately RMB/peak watt. Solar cells have a wide range of applications. For example, artificial satellites, unmanned weather stations, communication stations, television relay stations, solar clocks, electric fences, black lights, navigation beacons, and railway signals. Solar thermal conversion technology has the most products. Such as water heaters, water boilers, dryers, heating and cooling, greenhouses and solar rooms, solar cookers and high-temperature furnaces, seawater desalination devices, water pumps, thermal power generation devices and solar medical equipment.