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computational fluid dynamics

Performance of ventilation system in a non-standard operating room

In Hong Kong, design and construction of new operating rooms and upgrading of older ones have been based on the UK Health Building Notes. In a case study, field measurements showed that the airflow and some design features did not tally with the specifed requirements.
As the risk of contamination in an operating room can be minimized through appropriate filtration and air distribution scheme, a CFD analysis was carried out with the simulation of the temperature distribution, airflow pattern and the contaminant dispersion.

The study of active stack effect to enhance natural ventilation using wind tunnel and computational fluid dynamics (CFD) simulations

The use of a combined methodology of wind tunnel experiments and CFD simulations in order to study the potential of using active stack to enhance natural ventilation in residential apartments in Singapore is demonstrated in this paper. Comparison between the results obtained from the experiments and those from the simulations has been made.

Feasibility of CFD Simulation Applied to Air-Conditioning Systems of Telecommunication Rooms

The purpose of the present study was to evaluate the possibility to reproduce heat and air flowcharacteristics in a machine room where high heat generating systems and devices are installed. For this purpose, in an experiment room was air-conditioned by double floor air supply on the assumption that the machine room, data were selected such as air flow rate of the systems and various boundary conditions were elected. Further, double floor supply air flow rate distribution, and heat and air flow distribution in the room were measured.

A CFD Analysis of Airflow Characteristics at an Inflow Opening

We performed numerical simulation of the inflow characteristics at an opening by using LES,the standard k- emodel, and the improved k- emodel that was applied Durbins limitation (hereafter, it is described as Durbins k- emodel in this paper). As a result of this simulation, Durbins k- emodelreproduced the experiment result fairly well as in case of LES. Accordingly, by using Durbins k- emodel, the analysis was carried out on the air flow characteristics at some openings. As a result, the static pressure increase was induced by the collision of the air flow with the leeward opening frame.

Numerical Investigation of the Airflow in a Kitchen Hood

This study presents the results obtained when Computational Fluid Dynamics is applied tocalculating the flow in a domestic kitchen hood at operating conditions. Special emphasis has been placed on parametric modeling of the geometry to permit the rapid modification of fundamental parameters, such as the number of blades and the twisting angle. The governing equations (mass, momentum, energy and turbulence) have been solved using the commercial code, Fluent.

Prediction of transient contaminant dispersion and ventilation performance using the concept of accessibility

The method of exposure prediction using the scales of accessibility of supplied air (ASA) and the scales of accessibility of contaminant source (ACS) is presented in this paper. The spreading performance of supplied air and indoor pollutants can be figured out by CFD simulation and then used for the prediction of contaminant dispersion. For the validation of the model, a traver gas measurement was conducted.

Extension of a Two-Equation Turbulence Model for Displacement Ventilation Systems

The paper presents an extension of a two-equation turbulence model to predict the airflow fordisplacement ventilation systems. First, every flow effect is investigated separately natural convection along a vertical wall and above a person as well as mixed convection at the floor. Second, a CFD analysis of a test room is compared to full scale measurements. The modified two-equation turbulence model leads to a good agreement of the measurements and the calculations.

Parametric Study on a Displacement Ventilation System Using Three-Dimensional CFD

This paper examines airflow in rooms for a displacement ventilation system using threedimensionalCFD. A parametric study is executed for a typical office room with a dimension of 6m by 6m by 3m height according to a variety of supply air velocities, supply air temperatures and heat sourceconditions. A finite volume method and standard k- e turbulence model is employed to solve the governing equations. As a result, the temperature field in the modeled room for a displacement ventilation system is concluded according to a variety of the above parameters.

Study on Normalized Concentrations in an Occupied Zone in Office Space Optimization of Fresh Supply Air Flow Rate and Analysis of Energy Consumption

The values of the normalized concentration in the occupied zone (Cn) in an office space arecalculated by CFD for five different ventilation systems and the minimum ventilation rate which maintains the average concentration in the occupied zone under the regulated value is analyzed. Energy consumptions associated with the change in ventilation rate are analyzed. In this analysis, for most ventilation systems, the value of Cn is around 1.0, but for large circulation flow ventilation systems it changes greatly depending on the supply inlet velocity and temperature.

Effects of Exterior Thermal Transmission Modeling on Air Conditioning Heat Load Prediction of Large Space Buildings Using CFD

The effects of exterior thermal transmission modeling for walls and a roof on the airconditioning heat load prediction for a large space building were analyzed using a coupled simulation of convection based on CFD, radiation and conduction. Three cases were simulated: first, a simplified model using sol-air temperature (SAT) as outdoor boundary conditions; second, a rigorous model where both outdoor and indoor spaces were calculated simultaneously; and, third, using sol-air temperature modified by the results of the second case.

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