Solar energy is a renewable energy source.
It refers to the thermal radiation energy of the sun (see the three modes of propagation of thermal energy: radiation), and its main manifestation is often called solar rays. Nowadays, it is typically used to generate electricity or provide energy for water heaters.
Basic Features:
Advantages:
(1) Universal: The sun shines on the earth, without geographical restrictions, no matter the land or the ocean, no matter the mountains or the islands, they are everywhere. They can be directly developed and used, easy to collect, and do not require mining or transportation.
(2) Harmless: The development and use of solar energy will not pollute the environment. It is one of the cleanest sources of energy, which is extremely valuable todaytoday as environmental pollution becomes more and more serious.
(3) Huge: The energy of solar radiation that reaches the Earth's surface each year is approximately equivalent to 130,000 billion tons of coal, and its total amount constitutes the greatest energy that can be developed in the world today.
(4) Long term: Based on estimates of the rate of nuclear energy produced by the sun, hydrogen storage is sufficient to last tens of billions of years, and the duration life of the Earth is also about billions of years. In this sense, we can say that the energy of the sun is inexhaustible. ?[3]?
Disadvantages:
(1) Dispersion: Although the total amount of solar radiation reaching the Earth's surface is large, the density of the energy flow is very weak. On average, near the Tropic of Cancer, when the weather is relatively clear in summer, the radiation irradiancesolar energy is maximum at noon, and the average solar energy received over an area of 1 square meter perpendicular to the direction of sunlight is about 1,000 W if the average day and night throughout the year is only of about 200 W. In winter it is only about half, and on cloudy days it is usually only about 1/5. This energy flow density is very low. Therefore, when using solar energy, if we want to obtain a certain conversion power, we often need a set of collection and conversion equipment with a considerable area, which is expensive.
(2) Instability: due to the limitations of natural conditions such as day and night, season, geographic latitude and altitude, as well as the influence of random factors such as clear , cloudy, cloudy, rain, etc., reaching a certain ground Solar irradiation is both intermittent and extremelyt unstable, making it more difficult to apply solar energy on a large scale. In order to make solar energy a continuous and stable energy source and ultimately become an alternative energy source that can compete with conventional energy sources, the problem of energy storage must be well solved , that is, the energy of solar radiation during clear days should be stored as much as possible for use at night or when it rains. It is used for everyday use, but energy storage is also one of the weakest links in solar energy use.
(3) Low efficiency and high cost: The level of development of solar energy utilization is theoretically feasible in some aspects and technically mature. However, some solar energy utilization devices have low efficiency and high cost, and the current utilization efficiency inlaboratory does not exceed 30%. In general, the economy cannot compete with conventional energy. For a considerable period of time, the future development of solar energy use will be mainly limited by economic reasons.
(4) Pollution of solar panels: At this stage, solar panels have a certain lifespan. Typically, they need to be replaced every 3 to 5 years at most, and replaced solar panels are very difficult to replace. polluted by nature decompose, causing considerable pollution.
Is solar energy a primary energy source or a secondary energy source?
Renewable energy: energy that people can regularly supplement and permanently regenerate in nature.
Most new energy sources are renewable energy sources.
New energy sources mainly include the following types :
Geothermal energy --- The interior of the earth is hot When surface water enters the interior of the earth, it is transformed. in the steam. Use pipes to transport this steam and can be used to generate electricity or heat.
Solar energy, i.e. energy from solar radiation, can be used for heating, hot water supply, electricity generation, etc. Solar power plants have been developed abroad to directly supply households with electricity.
Wind power: Wind turbines drive small generators to produce electricity, and large-scale wind turbines are currently under development.
Waste energy: Waste and waste can be transformed into gas and oil through processing, or burned to generate heat to produce electricity.
Biomass energy – refers tothe energy contained in biomass, also called “green energy”.
Tidal power: uses the rise and fall of tides to produce electricity.
Ocean thermal power - uses the difference in seawater temperature to produce electricity. The temperature of sea water on the ocean surface and in the depths can differ by 25°C. This type of power plant can be built on an offshore dock or near the seaside to provide industrial power.
Wave energy - uses energy obtained from the force of waves to produce electricity.
Nuclear fusion energy is at the exploratory stage.
New energies have little impact on environmental protection and deserve research, development and promotion.
Primary energy.
Solar energy is a primary energy source. It is a source of energy renew and an indispensable element of human life.
Solar energy is a renewable energy source, which refers to the energy of thermal radiation from the sun. Its main manifestation is often called solar rays. In modern times, it is generally used to generate or supply electricity. Energy for water heaters. Since the birth of life on earth, we have relied primarily on thermal radiation energy provided by the sun to survive. Since ancient times, humans have also known how to use sunlight to dry objects and use it as a drying method. preparing food, such as preparing salt and drying salted fish.
As for primary energy, it refers to energy obtained from nature and used directly without modification or transformation, such as raw coal, crude oil, natural gas, hydraulic energy , wind power, energysolar, ocean energy, tidal energy and geothermal energy. Natural uranium ore, etc.
Disposable energy is divided into renewable energy and non-renewable energy. The first refers to natural energy that can be produced repeatedly, including solar energy, wind energy, tidal energy, geothermal energy, etc. a little less, mainly All types of fossil and nuclear fuels are an indispensable part of life.