The Principle Of Solar Collectors Is Very Simple
A solar collector is a device that absorbs solar radiation and transfers heat energy to heat transfer. Solar collectors can have a variety of classification methods, for example, according to the type of heat transfer fluid can be divided into liquid collectors and air collectors; according to enter the mouth of the solar radiation to change the direction can be divided into condenser type Heaters and non-concentrating collectors; Solar Collector according to whether the collector can track the sun can be divided into tracking the collector and non-tracking collector; whether the vacuum inside the collector can be divided into flat-type collector and Vacuum tube collector; according to the collector operating temperature range can be divided into low temperature collector (operating temperature below 100 ℃), the temperature collector (operating temperature of 100 ~ 200 ℃) and high temperature collector (operating temperature Above 200 ° C), and so on. And the most commonly used classification is divided into flat-type collector and vacuum tube collector.
The basic working principle of solar collectors is very simple. Generally speaking, the sun through the transparent cover plate to the surface coated with absorbent layer on the heat absorber, Solar Collector in which most of the solar radiation can be absorbed by the absorber, into heat, and to the fluid channel in the working fluid. In this way, the cold working fluid from the bottom of the collector is heated by the solar energy in the fluid channel, the temperature gradually increases, the heat after heating, with the useful heat from the upper end of the collector, Water tank stand-by, that is useful energy income. At the same time, due to the temperature of the heat absorber, Solar Collector through the transparent cover and the shell to the environment heat loss, constitute a flat solar collector heat loss.
Solar heaters are heat-absorbing plate shape, hence the name. It consists of transparent cover, heat sink, and jacket composed of four parts. The solar radiation passes through the transparent cover of the collector, is projected onto the heat absorbing plate, the heat absorbing plate absorbs and converts it into heat energy, and then heat is transferred to the heat transfer medium in the heat absorbing plate to raise the temperature Useful energy output. Transparent cover plate mainly plays the role of protecting the heat-absorbing plate, Solar Collector at the same time, the sun can also be a good projection into the transparent cover material has strict requirements, not only light is better, and the compressive ability to be strong. The development of the heat-absorbing panels has experienced a lot of ups and downs, such as early, the combination of pipe and flat with the use of binding, riveting, Solar Collector adhesive and other processes, but because these processes are very backward, heat transfer resistance. Later, the industry experts invented the high-frequency welding, ultrasonic welding and other advanced technology, so that these problems are resolved.
Solar thermal utilization is the main way of solar energy utilization. In all solar energy systems including solar hot water supply, solar heating, solar air conditioning and other systems, solar collectors are indispensable components, their performance and Costs play a vital role in the success of the whole system. The rational choice of solar collectors is of great significance to the efficient and economical operation of solar thermal systems.