Photovoltaic panels are devices that rely on sunlight to generate electricity. They are affected by various climatic conditions, such as ambient temperature (the higher the ambient temperature, the lower the power generation), air humidity (the greater the humidity, the greater the refraction and radiation of light) The greater the impact, the lower the power generation), obstructions, cloud cover, PM2.5--10 and other factors will all have an impact.
Which photovoltaic or wind power is less harmful to the environment?
1. Advantages of rooftop solar power panels
1. If the roof Installing solar power generation panels can effectively utilize solar energy resources to generate electricity, which can save electricity. Now the state has some subsidies for the installation of power generation panels. Through solar power generation, our usual electricity consumption will be relatively small, saving your home's electricity bill.
2. Installing rooftop solar panels is relatively simple. Generally speaking, a few workers can install them in half a day.
2. Disadvantages of rooftop solar power panels
1. The investment in installing solar power panels is relatively large. For some families, You may not accept it because of the cost of installation.
2. This kind of solar power generation panel is installed directly on the roof. If it is exposed to wind and sun for a long time, it may cause corrosion problems.
3. After all, solar power panels are obtained from solar energy. Only by using solar energy can we generate electricity, so they can only be used when the weather is sunny. However, if it is cloudy or the sun is not particularly strong, , electricity consumption will be affected.
4. During installation, holes need to be drilled on the roof to penetrate the roof. Unreasonable installation in the later stage will cause leakage problems on the roof.
3. Is it reliable to install solar power panels at home?
1. If you install solar power panels, this is actually actively promoted by the state, and it can generate electricity. Unused electricity can also be sold to the national grid and receive relevant subsidies. It can be connected to the power grid, which means that two electricity meters need to be installed in the home. One electricity meter is the electricity provided by the power supply company, and the other electricity meter is the electricity produced by the solar panels.
2. According to experiments, if more than 1,000 photovoltaic panels are installed in a building, the power generation capacity of photovoltaic panels can reach 300,000 kilowatt hours a year, so it is relatively reliable.
Can photovoltaic panels be installed at an angle of 15 degrees?
Both photovoltaics and wind power are currently recognized as new clean energy sources that have little impact on the environment.
However, although it is claimed to be clean energy, strictly speaking, whether it is photovoltaic or wind power, it will have a certain impact on the environment.
For example, photovoltaics will have the following impacts on the environment:
1. The layout of photovoltaic panels will take up a lot of space.
2. During the production process of photovoltaic panels, trichlorosilane and silicon tetrachloride will be produced, which are substances that have an impact on the environment and human health.
For example, wind power will also have an impact on the environment during the deployment process.
It is said that large-scale deployment of wind power will affect atmospheric circulation and cause changes in ambient temperature.
It is also said that large-scale deployment of wind power will affect the circulation of water vapor in the atmosphere and affect the distribution of rainfall zones.
Leaving aside whether the above statement is accurate, the two new energy sources of photovoltaic and wind power themselves have not yet achieved 100% no impact on the environment. ...it will have some impact to some extent.
Of course, compared with traditional energy sources, photovoltaic and wind power have very little impact on the environment and are environmentally friendly enough. This is why these two new energy sources and other new energy sources have such advantages. extensive development.
When we install photovoltaic panels, we generally need to determine the optimal tilt angle. The optimal tilt angle can improve the energy output efficiency of photovoltaic panels, thereby improving the efficiency of the solar power generation system.
First, let’s understand what inclination is.
The inclination angle refers to the angle between the photovoltaic panel and the ground. The optimal tilt angle refers to the tilt angle that can maximize the absorption of solar energy. The optimal inclination angle can maximize the time that sunlight reaches the photovoltaic panel directly, allowing more solar radiation to be radiated on the panel.
As shown in the figure:
Therefore, in engineering design, photovoltaic system designers will calculate the optimal tilt angle to ensure that the annual power generation of photovoltaic panels reaches the maximum. However, the optimal inclination angle of photovoltaics will be affected by various conditions. To determine the optimal inclination angle of photovoltaics, the following factors need to be considered:
1. Geographical location:Different geographies Locations have different solar altitude and azimuth angles, so the optimal tilt angles are also different. ——The optimal inclination angles of Harbin, Nanjing and Hainan are of course different.
2. Seasonal changes: The solar altitude angle and azimuth angle are also different in different seasons, so the optimal tilt angle needs to be adjusted according to the season. – This is only for PV panels with tracking capabilities. If it is a fixed installation, the calculation of the optimal inclination angle does not need to take into account seasonal effects.
3. Photovoltaic panel materials and types: Different materials and types of photovoltaic panels also have different requirements for the optimal tilt angle. For example, double-sided photovoltaic panels and single-sided photovoltaic panels are The difference is that double panels need to receive solar energy reflected from the ground.
4. Meteorological conditions: The impact of meteorological conditions on photovoltaic power generation also needs to be considered, such as temperature, wind speed, humidity, etc. Different meteorological conditions have a great impact on photovoltaic power generation, so the calculation of the optimal inclination angle must also consider the characteristics of local meteorological conditions.
In engineering practice, how do photovoltaic system designers generally calculate the optimal photovoltaic tilt angle? There are currently three popular methods in China, namely empirical method, analytical method and numerical method.
l? Empirical method? This method is that the optimal tilt angle of photovoltaic under different latitudes is the local latitude plus 5°-10°, different latitudes The range correction method is as follows:
l? Analytical method? For the azimuth angle of a fixed photovoltaic array, the relationship between the radiation intensity received by the photovoltaic array and the inclination angle is obtained through the calculation formula. This method is less practical when the azimuth angle is uncertain.
l? Numerical method? By calculating the numerical values of the solar radiation intensity received by the photovoltaic array under different azimuth angles and inclination angles, the best azimuth angle and inclination angle are obtained by comparison. . There are many calculation methods for this method, which can be understood as a problem of continuous optimization
One-click calculation of the optimal inclination angle is currently used by the Xihe Energy big data platform (xihe-energy.com) There are two methods:
The first: empirical method. When the user selects the photovoltaic planning and construction location on the map, the system will automatically generate the optimal tilt angle.
This angle is based on the empirical method, based on the latitude of the area, to generate the radiation amount in the area within an interval of plus or minus 20°, in which the inclination and azimuth angle corresponding to the maximum radiation intensity are optimal. Inclination and optimal azimuth.
The second type: the platform is based on the empirical method and combines the historical illumination data of the past 10 years to calculate the optimal inclination and orientation angle. By automatically optimizing the angle of inclination/orientation and taking into account the meteorological data characteristics of the area, a more scientific and reasonable design angle can be obtained.
In short, determining the optimal tilt angle can improve the energy output efficiency of photovoltaic panels, thereby improving the efficiency of the solar power generation system.