A adaptive controller was devised and implemented within the ESP-r simulation program to support the conflation of CFD with dynamic whole building thermal simulation. This controller manages all interactions between the coupled thermal and CFD modeling domains. It employs a quasi-steadystate modeling approach, wherein the separate CFD and thermal modeling domains operate in tandem and exchange information at their model domain boundaries on a per-time-step basis. A double-pass modeling approach is employed.
In this paper, a CFD analysis of airflow and contaminant distribution within enclosed vehicular parking facilities is presented. First, the CFD simulation is validated using field data. Then, the results of a parametric CFD analysis are summarized. In particular, it was found that significant fan
energy savings can be obtained when simple on-off controls are properly implemented without affecting the indoor air quality within the garage. Moreover, it was found that the position
After a review of CFD models and a simplified (zonal) models predictions, a simplified procedure, based on charts and non dimensional groups, is proposed in order to evaluate the ventilation rate through an open vertical window.
The use of hypochlorite for water disinfection is source of chloramines production, which are transferred to the atmosphere.Nitrogen trichloride (NCl3) is the main component, which is a major cause of respiratory and ocular problems for swimmers and lifeguards. This first part comprised a sampling campaign concerning the measurement of NCl3 in a swimming pool (Picardie-France) during 15 days (October 2001). This campaign concerned the air quality diagnostics and showed that the majority of detected levels were critical (P50 = 0,44 mg/m 3 ).
Basis of this work was the question of the formation of air flows in ventilated test rooms with regard to wall influences. In order to determine the effects of the room geometry and the air inlet angle a on the airflow a jet which was placed just below the ceiling was observed in symmetrically designed test rooms. Since there is a correspondence between measurement and CFD simulation, velocity vectors are extrapolated from the CFD simulation and analysed for different geometrical data.
A validated CFD model was used to generate concentration distribution data for CO2, radon and moisture in a Hong Kong workshop with displacement ventilation.Contaminant concentration distribution depends on the contaminant source type and location. A low concentration may be obtained in the occupied zone when the contaminant source is associated to a heat source whose thermal plume is sufficiently strong to reach the upper zone.
The objective of this paper was to illustrate the potential of the CFD technique to compare the effectiveness of different general ventilation systems in reducing the workers' exposure to styrene vapour in a workroom. . Thanks to the CFD technique predicted airflow velocities and styrene distribution are shown for the 3 different ventilation arrangements at identical planes across the room. And predicted values of styrene concentration at workers'position are given.
2 examples of extract systems are presented in this paper : the first one concerns dust removal in a public waste plant and the second smoke separation in a smoker/non-smoker zone with no visual impact (i.e. no walls).Thanks to the CFD simulation, proper exhaust systems for dust and smoke have been successfully designed and optimised for each case with simulation results. The proposed solutions were then realized and with few minor modifications led to excellent working conditions on the one hand and excellent smoke caption on the other hand.
This paper deals with a computer simulation of airflow and indoor environment in livestock buildings. Simulation results have been analysed and visualized with a Virtual reality visualization . The definition of virtual reality is given first , then the presentation of the 3 Virtual reality systems possibly used for the visualization, and finally a simulation tool.
5 cases were selected to demonstrate the different simulation and visualisation possibilities for people form the industry.
The REinforced EXhaust System (REEXS) is a local ventilation principle for industrial ventilation with improved efficiency for capturing contaminants released by working processes .This paper discusses the validation of a 3D CFD model for the determination of the capture efficiency of standard local exhaust ventilation systems.That study has shown good results in 3 ways :- Properly designed REEXS hoods , compared to conventional exhaust devices have a significant increase capture efficiency.- CFD is an excellent tool to predict different local ventilation strategies in a quantitative way.
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