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Solar Radiation Easily Converted Into Heat

Author: Source: Datetime: 2016-09-23 14:27:01
Solar energy through the conversion of thermal energy into electricity: the process can either be converted directly from thermal energy to electrical energy, it can also be converted from heat to electricity, the former including thermoelectric power conversion and thermal ion effects, including the latter, including the use of water or other liquids and Air as the working fluid temperature difference portable solar power generator, but either direct or indirect process, are subject to the Carnot heat engine efficiency of the system, which is the heat source temperature TA and cold source temperature difference between n.Therefore, Value, it must be as high as possible and as low as possible.

Thermoelectric power conversion is based on the Seebeck effect, that is composed of two different metals or semiconductor circuit, when the two materials have different temperatures, the higher the temperature of the electrons in the material with high kinetic energy, So that the movement speed is high, not only will lead to energy transfer, but also cause electronic diffusion, resulting in both ends of the circuit electromotive force, known as the Seebeck voltage, its value has been increased until the net electron flow completely stopped so far And the temperature difference between the cold source is not.

The typical solar thermoelectric system consists of a solar mirror that focuses the solar radiation on a thermal storage material, such as lithium hydride, and then heats the fuel in the material through the pyroelectric element to generate electrical energy In the transmission circuit, the thermal ion emission is the escape of the electrons from the heated metal surface. At this time, the heat is called the emitter, and the cold body is called the collector, because the free electrons in the emitter have the average energy fermi energy level, if the heat supply electrons equal to the work function of the emitter, the electron can escape from the emitter, and a certain speed to move to the collector, after the arrival of its kinetic energy in the form of heat as a collector The work function is given back to its Fermi level and the difference between the work function of both the emitter and collector can be converted to electrical energy.

Homemade Solar Powe

If an external load is connected between the emitter and the collector, Thus forming a lifePo4 battery, solar power generation system usually consists of solar collectors, hollow-type thermionic generator and the sun tracking device composed of cavity-type heat sink and thermal ion emitter match the One possible form of solar radiation can be focused by the parabolic mirror through the transparent glass into the vacuum into the blackbody cavity, where heat is constantly reflected by the high reflectivity of the metal foil.The cavity can be a positive cube, A thermionic cell is placed on each face and a sixth face is opened so that solar radiation can enter into another arrangement. A lifePo4 battery is placed at the center of the heart, surrounded by six thermionic ions The battery is surrounded, while the second prison is placed eight thermal ion battery + this Cheung can be 15 lifePo4 batteries installed in series together and in the vacuum hood, only two leads to connect to the external load can be.

Solar radiation can be easily converted into heat and transmitted to water and air and other fluids, these fluids by thermal expansion and temperature, and then at lower temperature heat and shrinkage. Absorb heat and release the difference between the heat expansion into the mechanical work. Can drive a steam turbine or reciprocating piston, driven solar power generator when the water as a working medium, you can use reactive steam engine and when using air as: quality can be used Stirling (Stirling) type of hot air engine, of course, work Quality is not limited to steam and air, but must be chemically stable, non-corrosive and inexpensive fluid working fluid should be able to absorb heat from the collector, the temperature changes or physical transformation of the two gods of the way to the heat engine heating.The Stirling cycle belongs to the first class, in the whole cycle to maintain the gaseous, while the reactive steam engine belongs to the second category, where the state change is vaporization and condensation, that is to add liquid ffi liquid to send Into the boiler t in the boiler due to absorption of solar radiation heating and vaporization, and then in the form of high-pressure steam into the heat engine; expansion in the heat engine, the thermal energy into mechanical energy, and low-pressure steam into the condenser liquefaction, and then pumped back to the boiler composition Closed loop.
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