An improved wall-mounted displacement ventilation system in a large-span machining workshop

作     者：Fei Liu Tengfei(Tim)Zhang Liqiang Yang Zhengwei Long Fei Liu;Tengfei(Tim)Zhang;Liqiang Yang;Zhengwei Long

作者机构：Tianjin Key Laboratory of Indoor Air Environmental Quality ControlSchool of Environmental Science and EngineeringTianjin University92 Weijin RoadTianjin 300072China School of Civil EngineeringDalian University of Technology(DUT)2 Linggong RoadDalian 116024China Tianjin Fengjin Auto Parts Co.Ltd.8 1 Xianfeng East RoadTianjin 300310China 

出 版 物：《Building Simulation》 (建筑模拟（英文）)

年 卷 期：2022年第15卷第11期

页      面：1943-1953页

核心收录：

学科分类：08[工学] 081404[工学-供热、供燃气、通风及空调工程] 0814[工学-土木工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the National Key R&D Program of the Ministry of Science and Technology China on“Green Buildings and Building Industrialization”through Grant No.2018YFC0705300. 

主　　题：ventilation workshop oil mist particle temperature CFD 

摘      要：A machining workshop requires ventilation that removes oil mist particles efficiently and conditions air to a comfortable temperature.Displacement ventilation has been reported to be highly efficient in removing airborne pollutants in a workshop.However,the traditional wall-mounted displacement ventilation system may be inadequate for delivering conditioned,clean air to the internal zone of a large-span workshop.This investigation proposed an improved wall-mounted displacement ventilation system in which machining equipment is elevated,relay fans are operated in corridors in the cooling season,and ceiling air exhausts are lowered.The proposed ventilation system was compared with the traditional wall-mounted displacement ventilation system and a displacement ventilation system with multiple local diffusers in the corridors,separately.A validated computational fluid dynamics(CFD)software program was used to investigate the three ventilation systems in both the cooling and heating seasons.The airflow,oil mist particle concentration,and air temperature under the three ventilation systems were evaluated.The results revealed that the traditional wall-mounted displacement ventilation system is inappropriate for use in a large-span workshop,particularly in the cooling season.The proposed improved wall-mounted displacement ventilation provided the lowest oil mist particle concentration in the breathing zone and an appropriate air temperature in the occupied zone in both the cooling and heating seasons.Notably in the cooling season,the proposed system reduced the oil mist particle concentration by 48.5%in the breathing zone as compared with the traditional system.Such an improved ventilation system is highly recommended for use in large-span workshops.