Air supply diffusers used in air-conditioning systems can be classified as ceiling diffusers, sidewall diffusers, floor diffusers, jet nozzles, and low velocity displacement diffusers. Fixed or adjustable slats are usually used to control airflow directions.
This paper describes a performance-based evolution model using Genetic Algorith as the evolution algorithm and CFD as the evaluation mechanism. The advantages of such an evolutionary performance-based design approach is that diverse instances of the state space can be investigated in relation to specific goal requirements that will enhance the possibility of discovering a variety of potential solutions. The model allows the user to explore and visualize the design evolution and its form generation in an attempt to stimulate the designer creativity that might contribute to their output.
The aim of the study is to validate CFD approaches for the simulation of the dispersion of gases and vapors in an enclosed space at different flow rates, and to show the impact of one important determinant of simulation accuracy.CFD results and measurements were compared, showing a good correspondance for the pollutant concentration when the boundary condition was a profiled velocity inlet and not an uniform velocity inlet.
The validation and development of turbulence models are still important issues related to Computational Fluid Dynamics for ventilation purposes. The present work continues the work initiated by (Voigt, 2002). Four turbulence models are reviewed, the k-e model, the k-w model and two blending models combining the k-e and the k-w model. The reason for testing the blending
This study compares the contaminant concentration obtained from simple models with contaminant concentration fields obtained from CFD simulations, for various rooms and source configurations. Airflow and contaminant distributions were simulated.
This paper is the investigation of two approaches for describing the details of air-flow in large indoor spaces. One approach is the zonal method, and the second one uses a CFD model.Results swow that when airflows details are necessary, coarse-grid CFD is a better method for predicting airflow in large indoor spaces than the zonal methods.
Objective measurement, CFD modelling and subjective assessment have been used in that study to evaluate the thermal comfort of an air-conditoned lecture theatre in the tropics. The simulated parameters are temperature, airflow rate and relative humidity.The parameters were found in the limits of the comfort standard. Occupants' vote show that they were uncomfotable and dissatisfied.
The dispersion of contaminants in an office environment has been investigated. The first experiment was made in a full-scale typical office equipped with two workstations located in the middle of the room and separated by a low-level partition, and the second experiment took place in a room separated in two halves with a low level partition, with one workstation at each corner. A constant injection of tracer gas allowed the measurement of the concentration of contaminant in the chamber for both the layouts.
For the study of single-sided natural ventilation, a CFD model along with analytical and empirical models have been used, to determine the effects of buoyancy, wind, or their combination on ventilation rates and indoor conditions.
This paper presents the objectives and results of the initial stage of an ongoing research project on coupling of building energy simulation (BES), airflow network (AFN), and computational fluid dynamics (CFD) programs. The objective of the research underlying this paper is to develop and verify a prototype cooperative BES, AFN, and CFD design environment for optimization of building energy performance and indoor environment.
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