共查询到10条相似文献,搜索用时 39 毫秒
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建筑室外热环境模拟计算是住区微气候研究的重要内容。本文提出了将求解建筑物和周围下垫面的热平衡方程组与室外空气场的CFD(Computational Fluid Dynamics)模拟计算相结合的方法,解决了空气场计算时间步长与建筑物以及下垫面计算时间步长不一致的问题。并提出将下垫面温度简化为逐时太阳直射区域温度和日影区域温度的方法,降低了CFD计算的复杂程度。该数值方法可以得到在自然条件作用下,建筑物表面和下垫面表面的逐时温度及空气温度与流动情况。计算结果与实验结果吻合较好,说明所提出的计算方法是有效的。 相似文献
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太阳辐射影响下的城市户外热环境评价指标 总被引:1,自引:0,他引:1
根据室内热舒适指标PMV,建立了评价城市户外热环境的舒适性指标,该指标在室内能与PMv很好的吻合,在户外能反映太阳辐射的影响,可与热应力指标wBGT一起作户外全范围的热环境质量评价,对城市环境的规划与设计有重要的指导意义。 相似文献
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以天津某高层住宅小区为对象,建立了小区建筑和室内户型的计算分析模型。基于CFD方法,开展了在冬、夏季典型气候下的室外风气候特性、室内自然通风情况的模拟分析研究。得到了住宅小区室外风速、风压的分布场、室内三维速度场、温度场分布场。探讨了风向、风速、窗户对局部气候的影响。研究表明对室外风环境,由于小区建筑的分布特征,存在着局部增强的强风区,最大速比达到1.8;就室内气候而言,具有自然对流效果的A型房间的自然通风效果要优于B型房间。通过对既有城市住宅小区的室内外气候环境的模拟分析,可以为建筑气候的设计提供重要的参考价值。 相似文献
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利用浅地表层所蓄太阳能改善室内热环境的埋管热过程研究 总被引:1,自引:3,他引:1
讨论了一种利用浅地表层蓄存的太阳能改善室内热环境人方法,建立了埋管冷却或加热空气的热过程数学模型,通过理论分析,数值模拟和实验测试较系统地揭示了热过程规律。结果表明,利用受太阳辐射影响较大的地表层蓄能改善室内热环境是可行的。 相似文献
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土壤蓄冷与释冷过程的模拟研究 总被引:1,自引:0,他引:1
综合蓄冷技术与土壤耦合热泵技术的优点,开创性地提出了以土壤作为蓄冷介质的集低温工况、空调工况和制热工况为一体的三工况型土壤蓄冷与土壤耦合热泵集成系统的新设想。并在能量平衡的基础上,建立了埋管管束内层及外层盘管蓄冷、释冷过程的数学模型。通过模拟计算,比较分析了内、外层单根盘管的蓄冷、释冷运行特性,并对单根埋管换热器蓄冷、释冷过程的传递冷量损失及垫层冷量损失进行了初步的分析。 相似文献
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In the framework of the PASCOOL project, theoretical and experimental studies have been performed to improve the quantitative understanding of the presence and distribution of massive building elements for the passive cooling of buildings. A new thermal model, based on effusivity, a parameter that can be analytically derived from the solution of the heat equation for a semi-infinite wall, was developed. The transient thermal response of a variety of building zones to a series of steps in heat gain has been measured for the validation of the thermal inertia models. It was observed that, for each step in gain, the mean surface temperature of the spaces increases proportionally to the square root of time, as predicted by the effusivity model. The results allowed the formulation of simple passive cooling design guidelines for buildings. 相似文献
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The thermomechanical fracture and interface delamination of thermal barrier coatings (TBCs) in a high-heat-flux environment is the result of large surface temperature and thermal gradient across the coating thickness and the resulting viscoplastic deformations induced in the ceramic material. The maximum coating surface temperature has been used as the key loading parameter in previous studies. The current study explores the effects of several other thermal loading parameters on thermomechanical response and fracture behavior of TBCs with or without preexisting surface cracks. Results show that for a constant maximum surface temperature, the thermal fracture of the coating is increased by (i) an increased temperature difference across the coating, (ii) longer heating duration, and (iii) more aggressive coating surface cooling after heating. These results provide insights into TBC thermal fracture mechanisms and can potentially improve the design of the morphology of preexisting cracks in the coating to reduce fatal interface fracture. 相似文献