Diffusion characteristics of oxygenic–thermal coupled airflow in high-altitude sleeping environment  

作　　者：Cong Song Xiaohui Li Yanfeng Liu Longxiang Gao 

机构地区：[1]State Key Laboratory of Green Building,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China [2]School of Building Services Science and Engineering,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China

出　　处：《Building Simulation》2024年第10期1749-1765,共17页建筑模拟（英文）

基　　金：supported by the National Natural Science Foundation of China(No.U20A20311,No.52378107);Shaanxi Provincial Association for Science and Technology Youth Talent Support Program(No.20230429);Research Program of Youth Innovation Team of Shaanxi Provincial Education Department(No.22JP039).

摘　　要：About 1/3 of human life is spent sleeping.The hypoxic and cold environment in high-altitude areas leads to sleep disorders that are more prominently harmful to the human body.To improve the quality of human sleep in high-altitude areas,this study explored the thermal and oxygen environment regulation for plateau sleep.In this study,the influencing factors of the diffusion of oxygenic–thermal coupled airflow were determined through the theoretical analysis of a thermal fluid mechanic jet.This study used computational fluid dynamics(CFD)to investigate the diffusion characteristics of the oxygenic–thermal coupled airflow with a sleeping experiment conducted on the plateau.The results showed that the influence of the thermal plume at 0.1 m near the human face was larger,and the oxygenic–thermal coupled airflow diffusion process was mainly divided into three phases over time.The size and time to stabilize the oxygen volume fraction in the inhalation zone varied between conditions and were strongly influenced by the temperature difference of the supply air.The effects of the thermal and oxygen environment were analyzed using indicators such as facial-area speed ratio,draft risk,and personal oxygen inhalation efficiency.The optimal design strategies were recommended with an outlet air velocity of 1.5 m/s,a temperature difference of 8 K between the outlet airflow and the indoor background air,and an outlet oxygen volume fraction of 30%.The results can provide implications for regulating the thermal and oxygen environment to improve human sleep quality in high-altitude areas.

关 键 词：high altitudes oxygenic–thermal coupled airflow sleep environment CFD method 

分 类 号：P433[天文地球—大气科学及气象学]