Using CFD simulations to develop an upward airflow displacement ventilation system for manure-belt layer houses to improve the indoor environment

2019 ◽  
Vol 178 ◽  
pp. 294-308 ◽  
Author(s):  
Xinjie Tong ◽  
Se-Woon Hong ◽  
Lingying Zhao
Keyword(s):  
Indoor Environment ◽  
Ventilation System ◽  
Displacement Ventilation ◽  
Cfd Simulations

Computational Modeling of Particulate Pollutant Transport in a Ventilated Room in the Presence of Two Heated Breathing and Rotating Manikins

2017 ◽  
Author(s):  
Seyed Ali Keshavarz ◽  
Mazyar Salmanzadeh ◽  
Goodarz Ahmadi
Keyword(s):  
Air Quality ◽  
Computational Modeling ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Rotational Motion ◽  
Indoor Environment ◽  
Ventilation System ◽  
Thermal Plume ◽  
Displacement Ventilation ◽  
Simulation Results

Recently, attention has been given to indoor air quality due to its serious health concerns. Clearly the dispersion of pollutant is directly affected by the airflow patterns. The airflow in indoor environment is the results of a combination of several factors. In the present study, the effects of thermal plume and respiration on the indoor air quality in a ventilated cubicle were investigated using an unsteady computational modeling approach. The person-to-person contaminant transports in a ventilated room with mixing and displacement ventilation systems were studied. The effects of rotational motion of the heated manikins were also analyzed. Simulation results showed that in the cases which rotational motion was included, the human thermal plume and associated particle transport were significantly distorted. The distortion was more noticeable for the displacement ventilation system. Also it was found that the displacement ventilation system lowered the risk of person-to-person transmission in an office space in comparison with the mixing ventilation system. On the other hand the mixing system was shown to be more effective compared to the displacement ventilation in removing the particles and pollutant that entered the room through the inlet air diffuser.

scholarly journals Incorporating cooling and ventilation effects into a single IEQ indicator

2019 ◽  
Vol 111 ◽  
pp. 02011
Author(s):  
Matjaž Prek ◽  
Gorazd Krese ◽  
Žiga Lampret
Keyword(s):  
Thermal Comfort ◽  
Indoor Environment ◽  
Cooling System ◽  
Ventilation System ◽  
Whole Body ◽  
Indoor Environmental Quality ◽  
Displacement Ventilation ◽  
Wall Displacement ◽  
Flat Wall ◽  
Ventilation Effectiveness

The influence of dissimilar cooling and ventilation system combinations on indoor environmental quality (IEQ) has been studied. A comparison of chilled ceiling cooling in combination with displacement ventilation, cooling with fan coil unit, and cooling with flat wall displacement inlets was performed. All observed variations were evaluated based on whole-body and local thermal comfort criteria as well as with regard to ventilation effectiveness. The analysis was made based on results of numerical simulations carried out in two steps. First, DesignBuilder was applied to model the buildings’ thermal performance and to evaluate its interaction with the environment. The latter included the calculation of heat gains as well as the heat loss on the boundary surfaces of the observed air-conditioned room. In the second step, ANSYS Fluent was used to simulate the response of indoor environment by utilizing the simulation results obtained in the first step, in order to evaluate the interaction between building and human. Afterwards, the observed thermal comfort and ventilation criteria were merged into a novel indoor environment indicator, which enables to describe the indoor environment quality with a single value. Among the analysed systems, the ceiling cooling system in combination with displacement ventilation was found to be the most suitable as it offers a high level of thermal comfort with adequate ventilation efficiency. Fan coil cooling was the least favourable option in terms of thermal comfort, while flat wall displacement inlets exhibited the lowest ventilation effectiveness. The performed investigation demonstrated the necessity to assess indoor environment with regard to IEQ in addition to energy consumption.

scholarly journals EXPERIMENTS AND CFD SIMULATIONS ON DISPLACEMENT VENTILATION SYSTEM WITH CEILING SUPPLY OUTLET

2008 ◽  
Vol 73 (628) ◽  
pp. 759-766 ◽  
Author(s):  
Shunsuke OGITA ◽  
Yasushi KONDO ◽  
Hajime YOSHINO ◽  
Takaharu KAWASE ◽  
Toshiaki HIRATA
Keyword(s):  
Ventilation System ◽  
Displacement Ventilation ◽  
Cfd Simulations

Personal Ventilation and Displacement Ventilation Assessment in Cubicle Workstations

2013 ◽  
Author(s):  
Waleed A. Abdelmaksoud ◽  
Essam E. Khalil
Keyword(s):  
Ventilation System ◽  
Displacement Ventilation ◽  
Pv System ◽  
Cfd Simulations ◽  
Healthy Environment ◽  
Personal Ventilation ◽  
Clean Air ◽  
Detailed Assessment ◽  
Indoor Spaces ◽  
Comfort Indices

Personal ventilation (PV) strategy is increasing very rapidly in ventilating the indoor spaces. Compared to the traditional ventilation system, the use of PV system can provide several advantages such as: energy reduction, comfort and healthy environment. Previous study reported in earlier paper [Schiavon et al. 2010] indicated that the use of PV system may reduce the energy consumption substantially (up to 51%) compared to mixing ventilation. Additionally, healthy environment is assured in the PV system due to the direct supply of fresh “clean” air to the occupant face. In the current study, detailed assessment of PV system and displacement ventilation (DV) system in a cubicle workstation (office cubicle) is presented. This assessment is based on CFD simulations. Five ventilation cases have been studied on the office cubicle. One case is performing a DV system only; another is performing a PV system only; the remaining three cases are performing a combined of PV and DV system. These cases have been evaluated using the PMV and PPD comfort indices, developed by Fanger 1970 and 1982. The target was to achieve a ventilation case that satisfies the best comfort indices near the occupant in the office cubicle. The five cases conditions and the best case conditions are presented in this paper.

Fume transports in a high rise industrial welding hall with displacement ventilation system and individual ventilation units

2012 ◽  
Vol 52 ◽  
pp. 119-128 ◽  
Author(s):  
Han-Qing Wang ◽  
Chun-Hua Huang ◽  
Di Liu ◽  
Fu-Yun Zhao ◽  
Hai-Bo Sun ◽  
...  
Keyword(s):  
Ventilation System ◽  
Displacement Ventilation ◽  
High Rise

Efficiency of Natural Ventilation in Central Greenhouse of Botanical Garden in Kosice

2017 ◽  
Author(s):  
Martin Kovac ◽  
Katarina Kovacova ◽  
Anna Sedlakova
Keyword(s):  
Indoor Environment ◽  
Natural Ventilation ◽  
Ventilation System ◽  
Botanical Garden ◽  
Simulation Tool ◽  
Summer Period ◽  
Radiation Level ◽  
Glass Panels ◽  
The Right ◽  
Calculated Model

The object of paper is analysis of natural ventilation system in central greenhouse of Botanical garden in Kosice. The greenhouse was refurbished in 2015. The existing greenhouse covering from glass panels was replaced for polycarbonate panels. The ventilation system of central greenhouse is natural and there are used openings in covering (wall, roof). It is combination of thermally and wind driven ventilation. The main aim of contribution is to analyse different modes of natural ventilation during summer period mainly. The important factors that influence efficiency of natural ventilation in greenhouse are location and area of openings, temperature stratification in greenhouse, solar radiation level, wind speed and direction too. If the greenhouse is ventilated naturally only through external windows (roof windows are closed) the efficiency of ventilation is very poor. The defined modes of natural ventilation search the right location and size of opened windows in order to achieve the most efficiency ventilation of indoor environment. For this purpose the progressive dynamic simulation tool DesignBuilder is used where the geometrical and specific calculated model of whole central greenhouse was created.

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