Abstract
Ventilation systems are used for create a thermally comfortable environment and good indoor air quality. It is therefore essential to have adequate tools for predicting the performance of these systems. Among the various approachs, the computational fluid dynamics could be a useful tool for the design of the ventilation system. When dealing with pollutants dispersion problems, a steady state averaged simulation can be misleading because it is not able to properly predict and model peak concentrations, which can be relevant even if temporary. An interesting approach is the use of LES (Large Eddy Simulations) simulations to obtain a better description of concentrations oscillations. In this framework, the aim of this work is the validation of simulation carried out using the FDS (Fire Dynamic Simulator) software with an actual case study, already studied with a mock-up. Secondly, two new configurations of the ventilation system are proposed, in order to stress the capacity of the software to describe complex and different features, classical of HVAC (Heating, Ventilation and Air Conditioning) systems. Interesting conclusions about efficiency are drawn from the comparison, highlighting the potentiality of the software.
Highlights
Ventilation is used in buildings for create a thermally comfortable environment and good indoor air quality
Predictive capacity of CFD models require a proper validation process, typically performed by reproducing experimental evidence; for this reason, Lee et al [10] have validated their model with the estimated the concentration of a tracer gas, isobutene, using a small-scale model; Deevy et al [11] have predicted the dispersion of a mixture of sulphur hexafluoride and helium in a thermally stratified room; Lambert et al [12] have studied the release of carbon dioxide into a ventilated space
The case study simulated in this paper is that proposed by Rota et al [14]; in which they have considered a ventilation system designed to reduce the risk to health in an industrial warehouse where calibration of thermocouples was carried out involving the use of alcohol baths, which, by evaporation, dispersed within the working environment
Summary
Ventilation is used in buildings for create a thermally comfortable environment and good indoor air quality. It is essential to have adequate tools for predicting the ventilation performance of buildings: analytical models [1]; empirical models [2]; small-scale models [3]; real-time models [4]; multi-zone models [5], [6]; CFD models (Computational Fluid Dynamics). Predictive capacity of CFD models require a proper validation process, typically performed by reproducing experimental evidence; for this reason, Lee et al [10] have validated their model with the estimated the concentration of a tracer gas, isobutene, using a small-scale model; Deevy et al [11] have predicted the dispersion of a mixture of sulphur hexafluoride and helium in a thermally stratified room; Lambert et al [12] have studied the release of carbon dioxide into a ventilated space
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