摘要
建筑内围护结构的热辐射不对称可能引起的室内温湿度分布异常,严重时甚至导致热舒适区的偏移。为精确预测热辐射不对称条件下室内热环境的变化特征,以海信空调公司的青岛厂区的环境实验室为研究对象,严格按照实验室的尺寸、布置进行全尺寸建模,并且保留了空调器内部的流动和换热结构,从而保证模拟结果的精度。为了兼顾流动和传热问题过程中高雷诺转捩流和远场低雷诺流动,采用了SST k-ω湍流模型;采用多孔介质模型模拟空调器内部换热器;采用Coupled算法来实现快速迭代计算。为了验证模拟的精确度,进行了相同边界条件下的试验测量,获得实验室内210个测点的温度值和4个高度上的相对湿度,并计算得到室内气流的均匀度、垂直温差等关键参数。结果表明,空调送风量的模拟值与实测值的相对误差为7%,98%温度测点的相对误差在±5%以内。研究表明,通过全尺寸数值模拟可以得到精度较高的室内温度分布的模拟结果,精确预测非对称热辐射条件下室内热环境。
The thermal radiation asymmetry of the building envelope may lead to the abnormal distribution of indoor air temperature and humidity,which in return might produce the deviation of the thermal comfort zone.To precisely predict the thermal and flow characteristics of the indoor thermal environment under the asymmetric thermal radiation condition,the experiment was conducted in an environmental laboratory at the Qingdao plant of Hisense Air Conditioning Company.The laboratory was modeled in full scale,strictly following its dimensions and layout,while keeping the flow and heat exchange structures inside the air conditioner to ensure the accuracy of the simulation.Considering the high Reynolds transition flow and the far-field low Reynolds flow during the steady operation of the air-conditioner,the SST k-ωturbulence model was adopted.Meanwhile,the porous media model was selected to simulate the internal heat exchangers of the air conditioner,and the coupled algorithm was adopted to realize the quick iterations.Experimental measurements under the same boundary condition were conducted to validate the accuracy of the simulation,including the air temperature at 210 measurement points and the relative humidity at four heights inside the laboratory.Some critical parameters such as air uniformity and vertical temperature difference were calculated.The results indicate that the relative error between simulated and measured air supply volume values is 7%,and 98%of the temperature measurement points relative error is within±5%.The findings demonstrate that the full-scale numerical simulation strategies used in the study could provide a reliable solution for the precise prediction of indoor thermal environments under asymmetric thermal radiation conditions.
作者
赵晓丽
胡松涛
朱辉
王刚
韩立彬
ZHAO Xiao-li;HU Song-tao;ZHU Hui;WANG Gang;HAN Li-bin(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266520,China)
出处
《科学技术与工程》
北大核心
2024年第9期3804-3812,共9页
Science Technology and Engineering
基金
山东省自然科学基金面上项目(ZR2022ME061)。
关键词
热辐射不对称
数值模拟
全尺寸建模
温度
相对湿度
thermal radiation asymmetry
numerical simulation
full-scale modeling
temperature
relative humidity
