The sun, our source of energy, the only star in the solar system on which life depends. It is about 150 million kilometers away from our earth. Its mass composition is mainly hydrogen and helium and a small amount of carbon and oxygen. The energy source is fusion between hydrogen and helium atoms. The mass of the earth is about 5.965×10*24KG, and the mass of the sun is about 330,000 times that of the earth, but the energy that the sun dissipates every second only accounts for a very small part of its own mass. How small is it? According to estimates by astronomers and physicists, the sun has existed for about 4.57 billion years, only consuming 30% of its own mass, and will continue to exist for about five billion years, so we can see the sun’s energy after a billion years. Excessive consumption and expansion make life impossible for the earth. Five billion years later, the sun will become a red giant star due to exhaustion of energy and will swallow the earth.
Let’s talk about how much energy the sun has.
The sun emits a lot of energy every second, but the earth can only receive about one part in 2.2 billion of it, but even this amount of energy can make the earth produce 220 billion tons every year. According to the “World Energy Statistical Yearbook 2017”, the global energy consumption in 2016 was about 13.672 billion tons of oil equivalent, so… In addition, it can be intuitively pointed out that every The solar energy received in a second is about 173,000TW (terawatt, physical energy unit, one terawatt is about 10 twelfth watts), how much is this energy? It is about 5 million tons of raw coal, and China’s annual coal consumption is about 4 billion tons. It seems that a lot of it actually only needs 800 seconds of sunlight, and we only receive 2.2 billionth of the energy emitted by the sun every second. One, if the energy of this second can be fully received and utilized, it can be used by human beings for about 2700 centuries. If all the energy of the sun’s billions of billions is used… well, if there is no if, it is unimaginable.
There is a less vivid example. We sprinkle a few grains of rice on the ground and are carried away by ants. These rice ants may eat for several days, but these rice are insignificant to us, and we may be the same to the sun. So human beings, the universe is vast and we can fly farther.
With the gradual exhaustion of resources and the shortage of many non-renewable resources, the utilization of renewable resources is particularly important. As a modern energy source, making full use of solar energy will be beneficial to long-term development. So, are we taking full advantage of solar energy now? What are the main aspects of solar energy utilization? Let me show you around.
Solar heating is widely used in my country, and the energy saving effect is obvious. At present, there are several ways to actively use solar energy:
Solar heat pump technology
Heat pump technology uses a small amount of high-grade electric energy as driving energy, absorbs low-grade heat energy from a low-temperature heat source, and then transfers it to a high-temperature heat source, so as to achieve the purpose of heat pump, thereby converting the energy of low energy quality coefficient into energy of high energy quality coefficient, saving energy. A new energy-saving air-conditioning heating and cooling technology with high energy. This is a technique that can boost energy.
A heat pump system that utilizes solar energy as the heat source of the evaporator is called a solar heat pump system. The main application field of solar heat pump is solar heat pump in winter, including the research of floor radiant heating system and solar heat pump water supply system in non-heating season.
Solar cooling technology
Solar cooling is a promising field, and it is also a hotspot of current refrigeration technology research. Solar cooling has the following three advantages: energy saving and environmental protection, heat supply and cooling demand can be highly matched in season and quantity. The stronger the solar radiation and the higher the temperature, the greater the demand for cooling capacity. Solar cooling can also be designed into a variety of energy systems, making full use of waste heat, exhaust gas, natural gas and other energy sources.
Building Photoelectric Integrated System (BIPV)
Now, in developed countries such as Europe and the United States, some utility companies use large photovoltaic fields to increase power, while other power companies use small photovoltaic fields close to users to achieve this goal. Some photovoltaic collector panels are placed near buildings, others on roofs, or simply integrated into the building envelope. In this case, the building optoelectronic integrated system came into being, referred to as BIPV. This BIPV photovoltaic device can be used as special components such as facade panels, roofs, curtain walls, glazing or awnings of buildings.
The main research field of solar heat pump application is winter solar heat pump research – floor radiant heating system and non-heating season solar heat pump water supply system.
It’s all about the use of solar energy. We encourage you to make more use of renewable resources such as solar water heaters and household appliances