What is a solar water heater?

Solar water heaters are usually placed on roofs or other sunny locations. Flat sensors can be used to heat cold water to 40 -60°C, providing domestic water to homes, hotels, hospitals and bathrooms. In sunny weather, cold water is usually added in the morning and solar-heated hot water can be used in the afternoon. Solar water heater is the simplest, most basic and most common solar thermal utilization device for human beings to use solar energy. A typical flat sensor is usually between 1.5 and 2 meters long. It is about 1 meter wide and the surface is usually covered with 1-2 layers of glass or transparent plastic. The distance between the transparent cover and the heat collecting plate is about 0.01-0.03 meters. The heat collecting plate is mainly coMade of ordinary steel, aluminum, low carbon steel or stainless steel and other metals. The heat collecting tube is attached to the heat collecting plate, or the two plates are connected to allow the heat collecting fluid to circulate inside. . The surface of the heat collecting plate is painted black or made into a selective absorption surface to effectively absorb solar radiation energy. Additionally, the shell is filled with thermal insulation material to reduce heat loss from the collector. After sunlight passes through the transparent cover, it is absorbed by the heat collecting plate and transformed into thermal energy to heat the heat collecting medium in the tube. The heat collection efficiency of a sensor with a selective absorption surface is higher than that of a sensor with only a black coating.