基于微热管阵列的太阳能温差发电系统优化

温差发电技术因为具有无噪音、无污染物排放、体积小、质量轻等优点,是当今社会能源利用的科学研究热点,但其输出功率过低,传热效果较差仍是很大的问题。该文将微热管应用于低温下的太阳能温差发电中,对温差发电的系统设计进行优化,对其光热输出功率、热电输出功率较低的问题进行改善,通过采用PLC的双轴跟踪和黑铬镀金膜,将太阳能吸热能力提高了5.32%,同时在传热与散热过程中采用液态金属填充硅脂,让微热管阵列在太阳能温差发电传热过程中减少热损失,让光热平均的输出功率提升2.21%,在热电转换过程中,通过采用变长式电导增量法的MPPT,改善功率输出不稳定,精准度不高的问题,总体的光电输出功率可达到28.32 W,较之前相比光电输出功率提高了5.19%,通过对太阳能温差发电系统的追踪优化和传热结构的改善,完善了光伏板在农业上的应用。

Optimization of solar thermoelectric power generation components with micro heat pipe array

Abstract: Thermoelectric power generation technology is a hotspot of scientific research on energy utilization in today''s society because of its advantages of no noise, no pollutant emission, small volume, light weight, etc. However, its output power is too low, and the heat transfer effect is still a big problem. In this paper, the micro-heat pipe was applied to the solar temperature difference power generation under low temperature, and the system design of the thermoelectric power generation was optimized, and the problem of low light-heat output power and low-temperature output power was improved, and the dual-axis tracking and black by PLC were adopted. The chrome-plated gold film increased the solar heat absorption capacity by 5.32%. At the same time, the liquid metal was used to fill the silicon grease during the heat transfer and heat dissipation process, so that the micro heat pipe array could reduce the heat loss during the heat transfer process of the solar temperature difference power generation, so that the light heat was averaged. The output power could be increased by 2.21%. During the thermoelectric conversion process, the MPPT of the variable length conductance increment method improved the instability of the power output and the accuracy was not high. The overall photoelectric output power could reach 28.32 W. Compared with the previous one, the photoelectric output power increased by 5.19%. Through the tracking optimization of the solar temperature difference power generation system and the improvement of the heat transfer structure, the application of photovoltaic panels in agriculture was improved. We have proposed a collector-type thermoelectric micro-heat pipe array at low temperature. The complexity of control, and the use of liquid metal-filled silicone grease and insulation frame reduced heat loss, increased output power, and increased the area of the collector according to the characteristics of solar radiation dispersion. The use of PLC dual-axis tracking not only increased the solar heat absorption rate, but also increased the surface temperature. In the solar temperature difference power generation, the application of the micro heat pipe array could effectively utilize the solar radiation dispersion in the low-temperature power generation technology. Low flow density characteristics, this module had the characteristics of collectors, such as easy to integrate with buildings, simple tracking mode, and also had strong frost resistance and stable operation, which could improve the overall output power. Solar temperature difference power generation using micro-heat pipe arrays explored power optimization from two aspects of photothermal and thermal power, and improved the power generation power per unit area, which provided a reference for large-scale application of temperature difference power generation technology at low temperature. The micro heat pipe was a component that used internal working liquid to conduct heat transfer. During operation, the working liquid inside the micro heat pipe was evaporated into a gaseous state by the heat transferred from the hot end, and the middle pipe transfered the gaseous working liquid to a temperature difference. At the cold end, the liquid obtained after cooling was transported to the hot end by the capillary having a capillary action and evaporated again.