First, we consider this system as a connector, then the connector requires pressure balance.
However, since the left solar collector absorbs solar energy, the temperature increases, the density decreases, and the water pressure at the same height decreases if you want to balance the left and right RIGHT. connector pressures, then left. The water level must rise to increase its pressure and reach the pressure balance between left and right. However, because the left side is still heated by solar energy, the water level continues to rise, and the water level on the right side will inevitably drop, thus forming such a cycle.
When the solar energy left disappears, the water flow stops.
Therefore, it is more appropriate to use the connector principle.
The operating principle of solar water heaters
The operating principle of water heatersu solar is quite intuitive. Its principle is to convert sunlight into thermal energy through the natural circulation of water. and the absorption of heat collectors effectively absorb heat to provide hot water. Firstly, cold water enters the water heater through pipes and the heat collector plate plays a key role in absorbing visible sunlight and converting it into thermal energy. This process mainly relies on the special coating of the heat collector. high absorption capacity and low long-wave emissivity, to retain heat. The heat collecting tube inside the collector is unique in design, similar to the elongated kettle liner. It is made of two layers of glass tubes. The outer layer is transparent, and the inner layer is covered with a coating that can selectively absorb sunlight to form. a void for maximiser Absorb thermal energy from solar radiation to a certain extent.
The collector tube design cleverly combines the principles of natural tracking and reflection. Thanks to its circular structure, it can fully receive sunlight and ensure efficient heat collection regardless of changes in the position of the sun. Even in very cold areas, solar water heaters can work stably in all seasons thanks to their excellent thermal insulation performance and year-round light reception capabilities. When the intensity of sunlight is insufficient, forced water circulation can be achieved through the built-in water pump to ensure hot water supply. The whole process requires no additional energy, is energy-saving and environmentally friendly and represents a sustainable solution for hot water supplysanitary.
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. Transform solar energy into thermal energy, then heat cold water. Since the density of cold water is higher than that of hot water, the hot water will automatically increase and 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 ist 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 closed water circulation circuit 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. The wavelength of thermal radiation of the collector is in the long-wave range, and the coating has low long-wave emissivity, thereby retaining solar heat efficiently. This heat is then used to gradually heat the cold water into hot water. Coll tubesolar collector 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 and outer tubes. 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.