Abstract
Our objective is to demonstrate the use of Computat ional Fluid Dynamic (CFD) in building applications. In particular, CFD has been used for temperature and a irflow predictions of building spaces conditioned u sing Under Floor Air Distribution (UFAD) System. The space used is an instrumented laboratory room (old day care center) located at the University of Wyoming. The use of the CFD simulation results provides insightfu l analyses of the UFAD design and diffuser locations. The k-e turbulent model was employed to simulate the environment above an Under-Floor Air Distribution (UFAD) system, where the air is supplied using different configu rations of several diffuser locations. Mesh generation was conducted using a pre-processor program, called GAMBIT. The CFD results were obtained using the program FLUENT and show flow and thermal patterns, using temperature and heat flux boundary conditions obtai ned experimentally. These boundary conditions have been used to predict the nature of convection heat trans fer through studying velocity and temperature patte rns. A realistic three dimensional model of the UFAD syste m is used for the simulation.
Highlights
Numerical investigations have been performed to predict the temperature and the velocity distributionsComputational Fluid Dynamics (CFD) has enormous potential for industry in the twenty-first century
The study of the vertical momentum of the supply airflow, the distance from diffuser, the orientation of the boundaries on the airflow and the temperature gradient were carried out for a three dimensional enclosure, with two supply diffusers located at the center of the room, two windows, on south and east walls and an exhaust grille
CFD has been used for temperature and airflow predictions of building spaces conditioned using Under Floor Air Distribution (UFAD) System
Summary
Computational Fluid Dynamics (CFD) has enormous potential for industry in the twenty-first century. The CFD method numerically solves a set of partial differential equations to evaluate velocity, pressure, temperature and the species concentration in fluid flow problems. FLUENT is a computational fluid dynamics package used to simulate flow problems. It is designed on the distributions within a space using an Under Floor Air Finite Volume Method (FVM) to solve governing. The first one, the computational domain is divided into control volumes and each volume integrals in equations that contain a divergence term are converted to surface integrals using the divergence theorem These terms are calculated as fluxes across volume surfaces of each finite volume, because the flux entering a given volume is identical to that leaving the adjacent volume, these methods are called conservative. CFD has been used for temperature and airflow predictions of building spaces conditioned using Under Floor Air Distribution (UFAD) System. The k-ε turbulent model was employed to simulate the environment above an Under-Floor Air Distribution (UFAD) system, where the air is supplied using different configurations of several diffuser locations
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