The purpose of this study is to test the Launder-Sharma low Reynolds number k-e model. This model is intended to improve the forecasting of aerothermal behaviour in air conditioned rooms. The model is based on the high Reynolds number k-e mode
After a short introduction of the "age of air" concept in ventilation, a theorem of conservation for the age of air at the outlet is presented. Restrictions to validity and two applications (to measurements and numerical simulation) are described. A rigorous analytic proof is shown based on field theory.
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