Study on the dispersion characteristics of thermally induced pollutants between rural house and film-covered buffer room

Rural environment pollution has become global issues, and it is urgent to find solutions. Based on natural ventilation, film-covered buffer room provides effective buffer space for mitigating indoor air pollutants. Nowadays, studies characterizing the thermally induced pollutant dispersion mechanism remain scarce. In this study, the pathways for air pollutants in rural house and film-covered buffer room system were characterized by smoke visualizations in a scaled model. Indoor smoke did not continuously flow into the film-covered buffer room, but rather a portion of smoke recirculated within the indoor space. The sensitivity coefficients of indoor pollution decay rate to the temperature and concentration differences between indoors and film-covered buffer room were 0.06 and 0.81 respectively. The film-covered buffer room was proven to have a better regulating effect in situations with higher pollutant concentrations. A rapid prediction model for the dynamic changes in indoor pollutant concentrations based on a circuit network analogy method was established. Among the predictive and experimental results, the CVRMSE was 10.25% and less than the limit of 30 % proposed in ASHRAE. Overall, calculated results from the established model were sufficient to reflect the regulating effect. Across all building layouts, indoor pollutant concentrations tended to stabilize after 15 minutes of ventilation process. The CO 2 concentration stabilized at approximately 1300 ppm. After the regulation of film-covered buffer room, indoor pollution exposure level decreased by 0.0048 g·h/m 3 to 0.0068 g·h/m 3 , and the reduction ratio was 26.44% to 37.69%. The installation of film-covered buffer room was beneficial to improving the health benefits of the villagers. The findings are conducive to deeply understanding the dispersion characteristics and provide theoretical support for improvements of rural living environment.