Direct-expansion type solar energy low-temperature thermal power generation and photovoltaic power generation compound system

Abstract

The invention relates to a direct-expansion type solar energy low-temperature thermal power generation and photovoltaic power generation compound system, which comprises an organic Rankine cycle power generation system, a thermal storage system and a photovoltaic heat collecting system. The photovoltaic heat collecting system comprises more than two parabolic reflectors positioned in a shell, wherein the bottom of each parabolic reflector is provided with a metal plate groove, the segments of an evaporation tube of an evaporator are respectively positioned in the metal plate groove at the bottom of each parabolic reflector, a heat absorption body is arranged above the metal plate groove, and a photovoltaic cell component is arranged above the heat absorption body. The concentration ratio of the parabolic reflector is smaller than 10. A direct-expansion type solar energy thermoelectric conversion structure adopted by the invention does not need an intermediate heat transfer medium, avoids secondary heat transfer, and effectively increases the heat transfer performance between an organic working medium and a photovoltaic heat collector. The invention realizes the direct combination of the evaporator and the heat collector, the organic working medium directly absorbs the heat to expand via the heat collector, and the invention breaks the limit of a secondary heat transfer key device of the previous solar energy low-temperature thermal power generation system.

Description

technical field [0001] The invention relates to the fields of thermal power generation and photovoltaic power generation in solar energy utilization. Background technique [0002] Sunlight contains a very wide spectral range in electromagnetic waves, generally ultraviolet light accounts for 7%, visible light accounts for 45% and infrared light accounts for about 47%. For silicon solar cells, which currently dominate the photovoltaic industry, only light with a wavelength of less than 1.1 μm has sufficient energy to generate an electron-hole pair formation current. The long-wave part of the solar spectrum with a wavelength greater than 1.1 μm cannot generate electron-hole pairs and converts into heat, and this part of energy accounts for about 25% of solar radiation. On the other hand, when the energy of the light is enough to generate electron-hole pairs, the size of the light energy has no effect. A photon above the critical value of light energy can only produce one elect...

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Problems solved by technology

[0005] The Stirling heat engine has yet to be commercialized, and it is di

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