高大中庭空调气流组织的数值模拟研究
发布时间：2019-04-02 01:31
【摘要】：设计初期对高大空间空调气流组织的预测以及对不同设计方案空调效果的预测,一直是困扰工程设计人员的难题。随着计算机技术的高速发展以及计算流体动力学(CFD,ComputationalFluidDynamics)的发展,使应用CFD技术模拟预测高大空间气流组织、热舒适性以及优化设计方案成为可能。本文采用CFD数值模拟的方法对高大中庭空调气流组织及热舒适性进行了研究,以期研究结果能为实际工程的空调设计提供一定的参考。 本文以济南市某大型公共建筑的高大中庭为研究对象,根据建筑的实际尺寸以及空调设计参数,建立分层空调设计方案下的计算模型。采用FLUENT软件,对分层空调设计方案下的气流组织和热舒适性进行了三维数值模拟研究,并对模拟结果进行了分析。模拟计算运用κ-ε两方程紊流模型和SIMPLE算法,近壁区采用壁面函数法考虑墙壁边界条件。 本文针对夏季和冬季不同的分层空调设计方案,详细分析了气流组织分布特性,并对各方案下的温度场、速度场、PPD-PMV值分布进行了研究分析。针对冬季工况,探讨了送风角度、送风方式、有无地暖等不同因素对室内热环境的影响。通过选取经典实验小室做模拟,把模拟结果与实验结果做对比,验证了CFD研究方法的正确性和可靠性。 研究结果表明： 1.对于夏季空调,风口布置方式对所选高大中庭气流组织影响不大,两侧送风和中间送风都能实现分层空调的效果,相比之下,中间送风要优于两侧送风。 2.对于冬季空调,送风角度对气流组织影响较大。两侧送风时,送风角度在20°～30°为佳；中间送风时,送风角度在20°时比较好。同一送风角度下,送风方式对分层空调气流组织也有影响,针对本文送风角度为20°时,中间送风方式要好于两侧送风方式。有无地暖对分层空调气流组织也有较大影响,研究结果表明,无论在哪种送风方式下,设置地暖都有利于减小中庭垂直温度梯度。 3.通过实验值和模拟值的对比,验证了CFD模拟方法的可靠性,从而证明CFD方法模拟高大中庭空调气流组织的可行性。
[Abstract]:At the beginning of the design, the prediction of air flow distribution in large space air-conditioning and the prediction of air-conditioning effect of different design schemes have always been difficult problems for engineering designers. With the rapid development of computer technology and the development of computational fluid dynamics (CFD,ComputationalFluidDynamics), it is possible to use CFD technology to simulate and predict the airflow distribution in large space, thermal comfort and optimization design scheme. In this paper, the CFD numerical simulation method is used to study the airflow distribution and thermal comfort of the tall atrium air-conditioning system, in order to provide some reference for the air-conditioning design of the practical engineering. Taking the tall atrium of a large public building in Jinan as the research object, according to the actual size of the building and the design parameters of air-conditioning, the calculation model under the design scheme of layered air-conditioning is established. The three-dimensional numerical simulation of air flow distribution and thermal comfort under the design scheme of layered air-conditioning was carried out by using FLUENT software, and the simulation results were analyzed. The k-蔚 two-equation turbulence model and SIMPLE algorithm are used in the simulation, and the wall boundary conditions are taken into account by the wall function method in the near wall region. In this paper, according to different design schemes of layered air conditioning in summer and winter, the distribution characteristics of air distribution are analyzed in detail, and the temperature field, velocity field and PPD-PMV value distribution of each scheme are studied and analyzed. According to winter conditions, the influence of different factors, such as air supply angle, air supply mode and ground warming, on indoor thermal environment is discussed. The correctness and reliability of the CFD method are verified by comparing the simulation results with the experimental results by selecting the classical experimental chamber as the simulation. The results show that: 1. For air-conditioning in summer, the arrangement of tuyere has little effect on the airflow distribution of the selected tall atrium. Both the air supply on both sides and the air supply in the middle can achieve the effect of layered air conditioning, in contrast, the air supply in the middle is better than the air supply on both sides. 2. For winter air conditioning, the air supply angle has a great influence on the air distribution. The best angle is 20 掳~ 30 掳for both sides and 20 掳~ 30 掳for intermediate air supply. At the same supply angle, the air supply mode also has an effect on the air distribution of the stratified air conditioning. When the air supply angle is 20 掳, the intermediate air supply mode is better than the air supply mode on both sides of the air supply mode in this paper. There is also a great influence on the air distribution of stratified air conditioning with or without ground heating. The results show that no matter which air supply mode the ground warming is beneficial to reduce the vertical temperature gradient in the atrium. 3. The reliability of the CFD simulation method is verified by comparing the experimental values with the simulated values, and the feasibility of simulating the airflow distribution of the tall atrium air conditioning by the CFD method is proved.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU831
本文编号：2452100
[Abstract]:At the beginning of the design, the prediction of air flow distribution in large space air-conditioning and the prediction of air-conditioning effect of different design schemes have always been difficult problems for engineering designers. With the rapid development of computer technology and the development of computational fluid dynamics (CFD,ComputationalFluidDynamics), it is possible to use CFD technology to simulate and predict the airflow distribution in large space, thermal comfort and optimization design scheme. In this paper, the CFD numerical simulation method is used to study the airflow distribution and thermal comfort of the tall atrium air-conditioning system, in order to provide some reference for the air-conditioning design of the practical engineering. Taking the tall atrium of a large public building in Jinan as the research object, according to the actual size of the building and the design parameters of air-conditioning, the calculation model under the design scheme of layered air-conditioning is established. The three-dimensional numerical simulation of air flow distribution and thermal comfort under the design scheme of layered air-conditioning was carried out by using FLUENT software, and the simulation results were analyzed. The k-蔚 two-equation turbulence model and SIMPLE algorithm are used in the simulation, and the wall boundary conditions are taken into account by the wall function method in the near wall region. In this paper, according to different design schemes of layered air conditioning in summer and winter, the distribution characteristics of air distribution are analyzed in detail, and the temperature field, velocity field and PPD-PMV value distribution of each scheme are studied and analyzed. According to winter conditions, the influence of different factors, such as air supply angle, air supply mode and ground warming, on indoor thermal environment is discussed. The correctness and reliability of the CFD method are verified by comparing the simulation results with the experimental results by selecting the classical experimental chamber as the simulation. The results show that: 1. For air-conditioning in summer, the arrangement of tuyere has little effect on the airflow distribution of the selected tall atrium. Both the air supply on both sides and the air supply in the middle can achieve the effect of layered air conditioning, in contrast, the air supply in the middle is better than the air supply on both sides. 2. For winter air conditioning, the air supply angle has a great influence on the air distribution. The best angle is 20 掳~ 30 掳for both sides and 20 掳~ 30 掳for intermediate air supply. At the same supply angle, the air supply mode also has an effect on the air distribution of the stratified air conditioning. When the air supply angle is 20 掳, the intermediate air supply mode is better than the air supply mode on both sides of the air supply mode in this paper. There is also a great influence on the air distribution of stratified air conditioning with or without ground heating. The results show that no matter which air supply mode the ground warming is beneficial to reduce the vertical temperature gradient in the atrium. 3. The reliability of the CFD simulation method is verified by comparing the experimental values with the simulated values, and the feasibility of simulating the airflow distribution of the tall atrium air conditioning by the CFD method is proved.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU831
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