外置式太阳能热电烟囱通风及其对室内热环境的影响

太阳能烟囱(solar chimney, SC)是热压驱动室内自然通风的重要手段之一，提高其太阳能利用率和通风性能具有重要意义。结合离散热源强化烟囱通风理念，提出了一种外置式太阳能热电烟囱并探讨了烟囱通风特性及其对室内环境影响。首先基于流动传热与热电能量转换理论，建立了太阳能热电烟囱二维非稳态模型。其次分析了不同热电发电机(thermoelectric generator, TEG)位置，如烟囱出口处(TEG-outlet),烟囱中部处(TEG-mid),烟囱入口处(TEG-inlet),烟囱通风性能与室内环境流动分布规律，并进一步讨论了热电发电性能。最后比较了外置式离散热电烟囱(solar chimney integrated with TEG,TEG-SC)与传统烟囱的各项通风、发电性能的差异，阐明TEG-SC的优势。结果表明：随着光照强度增大，热电放置在入口处相对于放置在出口处和中部处下的出口速度和每小时换气率量(air changes per hour, ACH)最大，此时，每个位置TEG的发电功率差别不大，但是随着光照强度的增大，热电放置出口处的发电功率会逐渐增大。与此同时，...

Ventilation of External Solar Thermoelectric Chimney And Its Influence on Indoor Thermal Environment

Solar chimney (SC) is one of the important means of indoor natural ventilation driven by thermal pressure. It is of great significance to improve the utilization rate of solar energy and ventilation performance. In this paper, an external solar thermoelectric chimney is proposed based on the concept of strengthening chimney ventilation with discrete heat sources, and the ventilation characteristics of the chimney and its influence on indoor environment are discussed. Firstly, based on flow heat transfer mechanism and the theory of thermoelectric energy conversion, a two-dimensional unsteady model of solar thermoelectric chimney model is established. Secondly, the location of different thermoelectric elements, such as TEG-outlet, TEG-mid, TEG-inlet, ventilation performance and indoor environment flow distribution are analyzed, and the performance of thermoelectric power generation is further discussed. Finally, the differences of ventilation and power generation between external discrete thermoelectric chimney (TEG-SC) and traditional chimney (SC) are compared to clarify the advantages of TEG-SC. The results show that with the increase of solar intensity, the outlet velocity and ACH of TEG-inlet are the largest compared with TEG-outlet and TEG-mid. At this time, the generation power of TEG at each location has little difference, but with the increase of solar intensity, the generation power of TEG-outlet will gradually increase. At the same time, the outlet velocity of TEG-SC is higher than that of a single TEG, and the total generation power is increased by nearly 3 times. Moreover, the ventilated volume of TEG-SC is increased compared with that of traditional SC, and the velocity is increased by 18.5% on average. The external solar thermoelectric chimney system proposed in this paper will provide a solid theoretical basis and technical guidance for strengthening indoor natural ventilation and improving the utilization rate of solar energy.