Zhao Yi

Zhao Yi

Zhao Yi, male, born in Jinzhou City, Liaoning Province, is now the product manager of Beijing Fisman Heating Technology Co., Ltd. and the director of China solar energy heat utilization industry association.

Main work

Participated in drafting the national standard of solar energy heat utilization industry in China, mainly engaged in product management, new product development, market strategic planning, design and application of solar water heating system, etc.

social activities

Energy saving and environmental protection is an eternal topic

host:

Hello, Sina netizens! Today, the guest of sina home guest chat room is Mr. Zhao Yi, manager of solar energy products of Beijing Fisman Heating Technology Co., Ltd. Mr. Zhao is also the first time to come to our jiachat site. You can say hello to our Sina netizens!

Zhao Yi:

Hello, Sina netizens!

host:

Mr. Zhao is a special manager in charge of solar energy products. Today we have only one key word, that is solar energy. Today, please give us the meaning of science popularization and solar energy. We just know what solar energy is. Can you give us a more professional explanation?

Zhao Yi:

I dare not say it's professional. Let's briefly introduce some basic meanings of solar energy. As the name suggests, solar energy is a kind of energy from the sun. It is a kind of energy generated by the continuous nuclear fusion inside the sun. This kind of energy is very huge and very long-term. We can understand it with the concept of a number. Solar energy reaches the earth's surface through radiant energy, which is only one of two billion times of the total solar energy. How much is the total energy? It's 170000 terawatts, equivalent to the energy that the sun radiates to the earth's surface every second, which can be equivalent to the energy released by 5 million tons of standard coal, so it's a very huge kind of energy. In a broad sense, wind energy, water energy, tidal energy, including part of the biomass energy on the earth are all derived from solar energy. It can also be said that even the biomass energy and fossil fuels on earth, such as coal, oil and natural gas, are solar energy stored in ancient times. In a narrow sense, solar energy is actually the direct conversion of solar heat, photoelectricity and photochemistry.

host:

You have just mentioned traditional energy sources such as coal, oil and natural gas. We know that in today's society, we are all talking about low carbon and environmental protection, which have their own shortcomings, especially in green environmental protection. Do solar energy have its disadvantages?

Zhao Yi:

There are, too. As we all know, solar energy is a kind of energy-saving, environment-friendly green resources, and is a renewable one-time energy, very good. But it has some inherent shortcomings, mainly two points. First, the energy density of solar energy is relatively low, that is, the intensity we can use is relatively weak. Second, the intensity of solar energy is affected by many factors, such as regional influence, seasonal influence and climatic influence. It can't be a constant. For example, the solar energy resources we can get in each square meter are different for different weather and climate in Beijing. Therefore, how to make comprehensive use of this kind of resources is a breakthrough in our research.

host

We know that the distribution of oil in the world is different. Many countries have to buy oil and natural gas from other countries. I wonder if there is such a bias for solar energy? Does the sun have regional restrictions on the energy distribution of each country?

Zhao Yi:

Yes, that's a very good question. China is a country with a vast territory and abundant resources. It spans more than 5000 kilometers from north to south, east to west. In China's vast geographical scope, China's solar energy resources are in fact regularly distributed. We can give a few specific points, for example, between 20 and 35 degrees north latitude, which is a distribution center of high and low energy value in China. What is high? It is the Qinghai Tibet Plateau, which is a solar energy rich area with the highest altitude and the best illumination. Due to the influence of environment, season and rainy weather, Sichuan Basin is one of the areas with the poorest solar energy resources in China. So in this area, we can form a very obvious contrast, one is the area with the highest value of solar energy and the area with the lowest value. we can understand the distribution of other regions in this way. It has a sense of hierarchy, that is, it forms a ladder sense of strong in the West and weak in the East, strong in the north and weak in the south. In other words, the distribution of solar energy resources in China is very regular, which is a pattern of the distribution of solar energy resources in the whole map of China.

host:

You just talked about the distribution of solar energy resources in China. How do we compare with other countries?

Zhao Yi:

China's resources are very good, because we are basically similar to the United States in the same latitude area, but far superior to Europe. This is the overall distribution of resources.

host:

That is to say, in terms of resources, our resources are still good.

Zhao Yi:

you 're right.

host:

I wonder if there is a gap between us and other advanced countries in the world in terms of utilization and development?

Zhao Yi:

In fact, China has a long history of developing solar energy, and has many of its own patents, intellectual property rights, products and new projects. So in the whole solar field, the development of solar energy in China and Europe is basically synchronous. So from a historical point of view, it is not too late for us to develop in the field of solar energy industry. But in some technical fields, especially in the field of high cutting-edge production and machining accuracy, there is still a certain gap. We can learn from many advanced production and R & D experience in Europe, including the use of solar energy. Because there are design, construction and installation, many things are not very standardized in the current domestic situation. On the contrary, in Europe, with the continuous improvement of many standards, their design, construction and utilization are very perfect, including auxiliary software To cooperate with the design, so it is a very good, very efficient way of application, we can apply and learn from.

Owner:

When netizens hear the three words of solar energy, they must think of water heater at the first time; secondly, we are now more common that there are some street lamps on the street with solar panels to supply energy; thirdly, we often see the appearance of solar vehicles on TV. Please tell us what solar energy can be used for? Can you classify us?

Zhao Yi:

In fact, solar energy can do a lot of things. At present, our domestic applications are generally divided into two categories, one is the photoelectric utilization of solar energy, the other is the photothermal utilization of solar energy. Like the street lamp and solar cell car you just mentioned, it belongs to the photoelectric conversion and utilization of solar energy. the so-called photoelectric utilization means that through the photoelectric effect of solar energy, through a solar energy conversion device, mainly solar cells, the solar light energy is directly converted into electric energy for storage and utilization, which is photoelectric utilization. Today we mainly talk about the utilization of solar energy. In fact, the utilization of light and heat is the most widely used form in China, with the lowest cost and the most application fields. It is a kind of absorption device through solar energy, we call it solar collector. The solar collector converts the radiant energy of the sun into heat energy, which is stored and used by other media and heats other objects. This kind of heat utilization is what we call solar photothermal utilization.

host:

Just now you mentioned that in the solar thermal utilization, you are talking about solar collectors. Does this solar collector have a classification?

Zhao Yi:

yes , we have. In fact, at present, we are divided into three categories. In fact, before, solar water heaters could be divided into four categories. Our four categories are divided according to the historical development years. For example, the earliest one is called "sunning". If you have the impression, a long time ago there was a big black barrel in the countryside. This barrel was painted black, put hot water on it, and then people could take a bath. This is the earliest form of solar energy utilization, called "sunning". Now it has withdrawn from the market. later, we found that it is called "all glass vacuum tube solar water heater", which is a lot of completely sealed glass. There is water in the glass and a water tank on it. This kind of glass tube is directly inserted into the water tank.

host:

That's what families use now?

Zhao Yi:

Yes, we can think that this is the second generation product. It should have appeared in the 1970s and 1980s, and it has been applied for nearly 30 years. This product is because the cost is relatively cheap, the cost is relatively low. So at present, we can see a lot of such applications in the market, including this kind of home appliances going to the countryside. The State advocates the large-scale promotion of this kind of products to the rural market. The third type of solar collector used in Australia will be called "flat-panel heat collector" in winter. The flat plate will not. The flat plate is equal to upgrading one layer. It is a completely closed plate, that is, there is no leakage of media after the plate is broken.

host:

What material is this board made of?

Zhao Yi:

There's an endothermic coating inside,

Chinese PinYin : Zhao Yi