No, the installed capacity has been limited. The full name of the hydroelectric power station is hydroelectric power station, which is a plant that converts the potential energy and kinetic energy of water into electrical energy. Its basic production process is: diverting water from high areas of the river or other reservoirs, using water pressure or flow to rotate the turbine, converting gravitational potential energy and l kinetic energy into mechanical energy, then the turbine turns the generator, converting the mechanical energy into electrical energy.
Diagram of working principle of solar water heater 1. Cold water enters the solar water heater through the pipe, passes through the heat collecting plate and the heat collecting plate can collect solar energy, convert solar energy into thermal energy. energy, then heat the cold water. Since the density of watercold water is higher than that of hot water, hot water will automatically rise, then form circulating power. The water will gradually heat up on the heat collecting plate. After reaching a certain temperature, it can enter. the hot water tank. Those who need hot water will be able to get hot water at any time. Heating Figure 2. In fact, the principle of solar water heaters mainly includes the following two principles: (1) The principle of water circulation, that is, the water flows automatically. This is based on the fact that cold water is denser than hot water. Cold water flows and hot water rises, forming natural convection that gradually heats the water in the water tank until it reaches the set water temperature. When the intensity of the sun is not sufficient to meet circulation needs, a water pump can be added to the circuitclosed water circulation to obtain forced circulation. (2) Collector heat absorption principle: There is a special coating on the collector surface of the solar water heater. This coating has a high absorption rate in the visible range of solar energy. After absorbing it in the form of heat, heat. the radiation from the collector will have the wavelength in the longwave range and the coating has low longwave emissivity, thus effectively retaining solar heat. This heat is then used to gradually heat the cold water into hot water. Solar collector tube Let's talk in detail about the collector tube on this collector. The collector tube is actually like an elongated hot water kettle liner. It is made of two glass tubes, one large and one small. the inner layer is covered with a spectrum-selective absorption coating and a straight void is drawn between the inner tubes andoutside. It forms the core of the solar water heater and is used to maximize the absorption of thermal energy after solar radiation. The vacuum glass tube is round, has the characteristics of naturally following the broad source of the sun, coupled with the reflection principle of the reflector, the glass tube can receive light from all sides, the heat collection effect lasts longer, the water temperature is higher. , and it can work normally all year round, even in alpine areas.