Whole year simulation of natural and hybrid ventilation performance and estimation indoor air quality for modernized school building

Within the Polish - Norwegian project SUREBILD (Sustainable Redevelopment of Buildings) special attention was paid to find the economically feasible technologies that might improve current poor indoor air quality in Polish schools. Detailed analysis has been performed for selected primary school including different scenarios of modernization of ineffective passive stack ventilation system. The results indicated that hybrid ventilation was the most interesting option from energy point of view. The paper describes whole year simulation of natural and hybrid ventilation performance and estimation of indoor air quality. Detailed simulation with 1 min time step was carried out using CONTAMW simulation environment. The comparisons take into account airflows, CO2 concentrations and perceived air quality expressed in decipol units. Because of huge amount of data the results are partly aggregated by statistical methods.