Study On The Impact Of Human Motion On Indoor Environment

Human motion is popular indoors and may influent the variables in indoor environment significantly. In China, indoor decorations using synthetic building materials have resulted in indoor air pollution, and the emitted volatile organic compounds (VOCs) may cause health complaints. For a short initial period the emission rate of dried materials from the installation of decorative boards is relatively high and may affect several indoor environmental variables including human health. In this paper we simulate exposure levels of a worker in the residential environment with different boundary conditions: ventilation modes, moving velocity, initial diffusion coefficient, inlet velocity and mixing ratio. The simulated motion is 5 seconds periodically (once every 15 minutes) and its impact has not been studied in the past. The study objectives are to investigate the influence of human motion and different boundary conditions on indoor environment, TVOC dose and contribution ratio of pollution source (CRP) index, to create relative inhalation dose level. In order to attain the above objectives, a computer program is developed to integrate the governing equations of human motion and a TVOC emission model.According to the simulation results, human motion acts as the disturbance, has a significant effect on indoor environment over a short period of time. Such effects are attributed to energy brought into the indoor environment by the human motion and variation of human body's location. The worker TVOC dose is affected by the ventilation mode. The highest dose is obtained by simulating the side ventilation mode, the displacement ventilation leads to the lowest dose. The higher Do, lower inlet velocity and lower fresh air radio lead to higher TVOC dose. Based on the RIDL values in this short-term installation, using the building material with low D₀ is the most effective way to improve the indoor air quality, and increasing the inlet velocity is more helpful than increasing fresh air ratio. These results of the numerical simulation can be used to design an appropriate ventilation mode for improving the worker's occupational indoor environmental conditions.