ABSTRACT
Ventilation systems are responsible for delivering air in air-conditioned spaces to accomplish the ventilation as well as heating/cooling tasks. This chapter introduces the state of the art in modeling and simulation of airflow, air temperature, and contaminant concentrations in buildings. It deals with simulation examples for different ventilation systems, such as mechanical, natural, and hybrid ventilation. The simplest mathematical models for calculating the distributions of indoor airflows, temperature, and contaminant concentrations are probably the multi-zone airflow network models. These models solve the conservation equation for mass, energy, and species concentration based on a number of approximations. Computational fluid dynamics (CFD) models can provide detailed indoor parameters of design interests such as velocities, temperatures, and contaminant concentrations in a reliable and fast manner. CFD approach is very popular due to its flexibility in testing different diffuser layouts and supply air jet parameters.
