Solar energy is a kind of renewable energy. It refers to the thermal radiation energy of the sun (see the three modes of thermal energy transmission: radiation), which is mainly represented by the sun’s rays. In modern times, it is generally used to generate electricity or provide energy for water heaters.
Since the birth of life on the earth, it has mainly lived by the heat radiation energy provided by the sun. Since ancient times, people have also learned to dry things in the sun as a way to make food, such as salt making and salting fish. With the decrease of fossil fuels, solar energy has become an important part of human energy use and has been continuously developed. Solar energy can be used in two ways: light heat conversion and photoelectric conversion. Solar power generation is a new renewable energy. In a broad sense, solar energy also includes wind energy, chemical energy, water energy, etc. on the earth.
photovoltaic
Photovoltaic panel module is a power generation device that will generate direct current when exposed to sunlight. It is composed of almost all solid photovoltaic cells made of semiconductor materials (such as silicon). Simple photovoltaic cells can provide energy for watches and computers, while more complex photovoltaic systems can provide lighting, traffic lights and monitoring systems for houses, which are connected to the grid for power supply. PV panel modules can be made into different shapes, and modules can be connected to generate more electricity. Photovoltaic panel modules can be used on the roof and the building surface, or even used as part of windows, skylights or shielding devices. These photovoltaic facilities are usually called photovoltaic systems attached to buildings.
According to the survey, the profits of the world’s top five manufacturers have shrunk due to overcapacity, and the installation of photovoltaic modules will decrease in 2012, which is the first decline in more than 10 years. According to the average forecast of six Bloomberg analysts, 24.8GW of photovoltaic modules will be installed by households and commercial institutions around the world. This is equivalent to the power generation of about 20 nuclear reactors, but it is 10% lower than the photovoltaic installed capacity of 27.7GW. According to Bloomberg New Energy Finance, the average annual installation has increased by 61% since 1999.
Photothermal
Modern solar thermal technology aggregates sunlight and uses its energy to produce hot water, steam and electricity. In addition to using appropriate technology to collect solar energy, buildings can also use the light and heat of the sun by adding appropriate equipment during design, such as giant southward windows or building materials that can absorb and slowly release solar heat.
Post time: Nov-18-2022