【作者】 朱树园；

【导师】 张强； 周敏；

【作者基本信息】 西安建筑科技大学 ， 供热、供燃气、通风与空调工程， 2007， 硕士

【摘要】 以无因次温度值表示的热分布系数，或其倒数通风(温度)效率是自然通风建筑热环境综合效应的集中反应。它既是设计过程中预设、比较的重要根据，亦是运行管理时检验与评估的重要指标。通过对它们的研究可以使我们了解影响自然通风系统的因素，进而设计出更好的自然通风系统，从而达到节能和提高室内空气品质的目的。本文通过对教室抽象出来的一类物理模型为研究对象，建立数学模型，采用CFD软件求解出该模型在给定围护结构内表面热流密度、室内热源位置、入口和出口位置的情况下的速度场和温度场，分析了自然通风热分布系数关于格拉晓夫数、室内传热量、围护结构传热量、热源面积、房间高度、进出口面积等因素的影响规律。另外还分析了针对这一类研究对象所适用的紊流模型。通过研究表明，针对这一类的研究对象，采用标准k-ε模型求解较为合适；热分布系数随Gr、f／F、2／H、ζ的增大而增大，随A／F的增大先减小后增大，墙壁得热对热分布系数的影响不大，另外作者经过反复尝试得出了无墙壁得热与有墙壁得热两种工况下的热分布系数无因次关系式。更多还原

【Abstract】 The heat distribution coefficient expressed with the dimensionless temperature, or which reciprocal the ventilation (temperature) efficiency is the main reaction of the synthesize effect of heat environment in building. It is an importance basis to enact beforehand and compare in the design process, also is an important index to test and evaluate during the management. By researching that, the influence factor of natural ventilation system can be understand, then the better natural ventilated system can be designed and the purpose of energy economized and indoors air quality increased can be attained.Using a physical model abstracted from classroom as the study object, established the mathematical model and adopted CFD software to solve the model’s velocity and temperature distribution under the situation of giving the heat flux of the constructions’ inside surface, the positions of heat source indoor and entrance and export. It analyzed influence laws of natural ventilation’s heat distribution coefficient concerning Gr number, quantity of heat source indoor and outdoor, heat source area, room height, entrance and export area etc., and analyzed the turbulence model shoud be taken to this type of study object.Through the research indicated that, to this type of study object using the standard k-εmodel to solve was appropriate. Heat distribution coefficient increased with Gr、r/F、2/H、ξ, after increase reduced with A/F, the wall had heat transfer influenced the heat distribution coefficient indistinctively. Moreover the author through attempted repeatedly obtained heat distribution coefficient dimensionless relationship under two conditions of the wall had heat transfer and no.更多还原