Simplified prediction using block model for vertical profile of temperature and contaminant concentration in a room with impinging jet ventilation

2021 ◽  
pp. 108643
Author(s):  
Tomohiro Kobayashi ◽  
Noriko Umemiya
Keyword(s):  
Vertical Profile ◽  
Impinging Jet ◽  
Contaminant Concentration ◽  
Jet Ventilation ◽  
Block Model

scholarly journals Simplified Prediction Method of Vertical Temperature Distribution for Impinging Jet Ventilation System

2019 ◽  
Vol 111 ◽  
pp. 01097
Author(s):  
Tomohiro Kobayashi ◽  
Toshiya Nishiumi ◽  
Noriko Umemiya
Keyword(s):  
Thermal Diffusivity ◽  
Temperature Distribution ◽  
Parametric Study ◽  
Impinging Jet ◽  
Calculation Model ◽  
Jet Ventilation ◽  
Block Model ◽  
Vertical Temperature ◽  
Simplified Calculation ◽  
Vertical Temperature Distribution

The impinging jet ventilation (IJV) system is an air-distributing strategy to generate a thermal stratification in a room by supplying the air vertically toward the floor, which provides higher ventilation effectiveness than mixing ventilation. To date, however, no simplified prediction model of indoor thermal environment for an impinging jet ventilated room has been established. Therefore, this study aims to propose a simplified calculation model based on “Block Model”. This paper first presents a parametric study using Computational Fluid Dynamics (CFD), where total supply airflow rate of a test room is changed as a parameter. The number of terminal is also changed. Secondly, the paper presents the simplified calculation model of vertical temperature distribution based on block model that solves heat flow by advection and diffusion. Here, in this prediction model, the most important parameter is the turbulent thermal diffusivity between two room-space blocks in vertical direction. The room-space blocks are classified into two types, i.e., lower and upper part of a room. Based on parametric study using CFD, turbulent thermal diffusivity is arranged for lower and upper block respectively, and it is finally shown that the vertical temperature distribution from block model well agrees with CFD result.

Multi-objective optimization of impinging jet ventilation systems: Taguchi-based CFD method

2018 ◽  
Vol 11 (6) ◽  
pp. 1207-1214 ◽  
Author(s):  
Samira Haghshenaskashani ◽  
Behrang Sajadi ◽  
Mathias Cehlin
Keyword(s):  
Impinging Jet ◽  
Multi Objective Optimization ◽  
Jet Ventilation ◽  
Multi Objective ◽  
Cfd Method ◽  
Ventilation Systems

Analysis of the factors influencing the airflow behavior in an impinging jet ventilation room

2020 ◽  
Author(s):  
Xiufeng Yang ◽  
Xiao Ye ◽  
Bin Zuo ◽  
Ke Zhong ◽  
Yanming Kang
Keyword(s):  
Impinging Jet ◽  
Jet Ventilation ◽  
Factors Influencing
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