Method for evaluating thermoelectric performance of low-power concentrating photovoltaic-thermal system

Abstract

The invention relates to a method for evaluating the thermoelectric performance of a low-power concentrating photovoltaic-thermal system, a single reflection compound parabolic concentrator can collect solar scattered radiation with the efficiency of a geometric concentrating ratio reciprocal thereof in allusion to a low concentrating ratio range with the geometric concentrating ratio being less than 10*, the product of the geometric concentrating ratio reciprocal of the single reflection compound parabolic concentrator and the solar scattered irradiance is introduced into an electrical performance evaluation system, thereby realizing more accurate evaluation for the electrical performance of a device. In addition, a solar pyranometer and a scattered radiometer are installed in the device, and follow a tracking strategy of the device. Thermoelectric performance evaluation can also be realized for devices with a single-axis and double-axis tracking strategy accurately because the cosine loss is very small.

Description

technical field [0001] The invention belongs to the research field of comprehensive utilization of concentrated photovoltaic light and heat, and relates to a thermoelectric performance evaluation method of a low-magnification concentrated photovoltaic light-thermal system. Background technique [0002] In the process of collecting solar energy in the concentrating system, the concentrator can only collect the direct solar radiation DNI. Therefore, when calculating the photoelectric performance of the system, only the collected direct solar radiation DNI is considered, that is, the direct solar radiation is used as the denominator to calculate the electrical performance Evaluation, such as the standard IEC62108:2007 and BS EN62108:2008, only consider the direct solar radiation DNI when evaluating the photoelectric performance. The standard IEEE1513-2001 believes that if the concentrator does not use scattering, it does not need to consider the solar scattered radiation SDI, so...

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Problems solved by technology

[0002] In the process of collecting solar energy in the concentrating system, the concentrator can only collect the direct solar radiation DNI. Therefore, when calculating the photoelectric performance of the system, only the collected direct solar radiation DNI is considered, that is, the direct solar radiation is used as the denominator to calculate the electrical performance Evaluation, such as the standard IEC62108:2007 and BS EN62108:2008, only consider the direct solar radiation DNI when evaluating the photoelectric performance. The standard IEEE1513-2001 believes that if the concentrator does not use scattering, it does not need to consider the solar scattered radiation SDI, so For the photoelectric performance evaluation of the current concentrating system, there is no standard considering SDI; but some concentrators, such as compound parabolic concentrators (CPC), can not only collect DNI, but also partially collect SDI. Rabl A, etc. The academic paper Design and test of non-evacuated solar collectors with compound parabolic concentrators proves that the collection efficiency of CPC to SDI is the reciprocal of its geometric concentration ratio C through theory and experiments; for low concentration ratios with geometric concentration ratios less than 10× Scope concentrator, according to Wei Jinjia's invention patent "a design method for a flat-plate receiving compound parabolic concentrator" (patent number: ZL 201410160640.9) designed to eliminate multiple reflections of a compound paraboloid to form a single reflection concentrator (EMR) , Xie Huling et al. proved through theory and experiments in the academic paper Design and performance research on eliminating multiple reflections of solar radiation within compound parabolic concentrator (CPC) in hybrid CPV / T system that the collection efficiency of EMR to SDI is also its geometric concentration ratio C EMR For the EMR concentrating cogeneration device, the photoelectric performance evaluation cannot only consider the direct solar radiation DNI, but also part of the SDI. Therefore, a corresponding method is urgently needed to accurately evaluate the single-reflection compound parabolic concentrator. Thermoelectric performance of EMR concentrated heat and power cogeneration device

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