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To Achieve The Conversion From Light To Heat
- Sep 22, 2017 -

Sunshine is both a physical wave and a modern understanding of the particles, it is very fast transmission, it reflects the light refraction and reflection and other basic physical principles, but also showing a quantum, statistical characteristics of some. How to capture these vagaries of photons, and for human services, is the key issue in the use of solar energy. It involves concentrator, receiver design and interrelationships. Because of the low density of sunlight in nature, the capture of sunlight involves almost all solar applications. In the artificial solar system, some in order to generate electricity, and some in order to collect heat, and some in order to transform solar energy for other forms of energy, but most need to gather, the sun through the condenser of the aggregation, increasing the density of light , And then sent to the receiver, the receiver absorption part of the light is gathered, the temperature increases, the completion of light energy capture, to achieve the transition from light to heat. In this process, the ideal degree of the condenser, the receiver and the efficiency of the overall coordination directly determine the efficiency of the solar capture process.

The more mature converters currently have parabolic reflectors, Fresnel transmissive or reflex concentrators, and the resulting converged concentrators. The more prominent problem is the condensing ratio, optical efficiency or light transmittance, receiving angle and other physical problems. Receivers are flat, vacuum tube and cavity several categories. The more prominent problems are physical problems such as receiver rate, selective absorption, temperature control and heat transfer efficiency.

Efficient receivers can quickly convert sunlight that is projected onto its surface into heat energy and prevent heat loss. Therefore, the receiver or the heat sink is a key component of the solar collector system and the most technically challenging equipment component of the solar thermal power generation system. The heat transfer process of the receiver has the following four characteristics: the energy distribution time and the height of the space are not uniform, which is determined by the variability of the sun; the higher operating temperature, which is determined by the condenser process; The high heat flux density, which is determined by the economic requirements of the system; radiation-conduction-convection is coupled to each other by the energy transfer process, which is determined by the receiver in the Earth's environment.

For example, in solar thermal systems, the input of solar energy is extremely unstable, and the demand for energy at the output is also fluctuating. Usually need to constantly dynamic control of the collector system, the system can be stable operation. In addition, the traditional receiver is through the heat transfer fluid (such as water or heat transfer oil) from the heat transfer from the receiver to the power system or user. These heat transfer processes increase the complexity of the system, and thus produce the receiver efficiency problem, its optimal operating temperature, the best receiving area, the best heat transfer rate and the minimum heat loss and other parameters become the receiver design In the most fundamental problem.

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