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自然通风是实施绿色建筑中常用的一项技术措施。随着节能减排的大力倡导,自然通风技术引起了人们的普遍关注。目前,人们已通过不同的措施与手段来最大程度地利用自然通风以满足舒适度要求,其中太阳能烟囱作为一种利用热压来强化自然通风的有效技术也被广泛采用。太阳能烟囱的通风效果除与烟囱尺寸及当地太阳辐射强度密切相关外,也与其自然通风建筑特性有关。采用FLUENT软件对太阳能烟囱结合不同建筑开口形式及不同开口尺寸的自然通风模型进行了三维稳态数值模拟。研究了在不同方案下,不同开口形式对通风量的影响,分析了通风量随进风口尺寸的变化情况。模拟结果表明,在相同热流密度情况下,单开口建筑下的太阳能烟囱诱导的通风量大于双开口建筑,且当进出风口面积比A1/A2=2.5~4时,竖直集热板屋顶式太阳能烟囱能诱导更多的空气。
Natural ventilation is a commonly used technical measure in the implementation of green building. With the energetic advocacy of energy-saving emission reduction, natural ventilation technology has aroused widespread concern. At present, people have taken full advantage of natural ventilation to meet the comfort requirements through various measures and means. Among them, the solar chimney is widely used as an effective technique for enhancing natural ventilation by using hot pressing. In addition to the chimney size and the local solar radiation intensity is closely related to the ventilation effect of the solar chimney, but also with its natural ventilation building characteristics. The three-dimensional steady-state numerical simulation of the solar chimney combined with the natural ventilation model with different building openings and different opening sizes was carried out by using FLUENT software. The influence of different opening forms on ventilation rate under different scenarios was studied, and the change of ventilation volume with inlet size was analyzed. The simulation results show that under the same heat flux density, the ventilation capacity induced by the solar chimney under the single-opening building is larger than that of the double-opening building. When the ratio of inlet to outlet is A1 / A2 = 2.5-4, the vertical solar collector roof solar The chimney can induce more air.