The post-renovation indoor environmental quality in a research institute: 3D visualization in the map

This study aims to evaluate and analyse how a renovation impacts occupant satisfaction through a pre-and post-occupancy evaluation with physical measurements and occupant satisfaction survey. The study was performed for the HVAC renovation of a research institute in Korea. Online occupant survey was conducted in 2021 winter before renovation and in 2022 summer after renovation. Both surveys were performed by using Korean Building Occupant Survey System (K-BOSS) which is integrated building open data including spatial information. The physical measurements through sensors were conducted simultaneously with surveys. In terms of sensor measurement, representative IEQ factors such as temperature, relative humidity, CO2 concentration, and illuminance were measured. The surveys included three main indoor environmental quality categories such as thermal comfort, air quality, lighting environment. The measured results were analysed via T-test. As a result, the study found a statistically significant improvement with HVAC renovation about relative humidity in physical measurements and thermal comfort, air quality, overall occupant satisfaction in the survey. The results are displayed in the 3D (three dimensional) indoor map to help intuitively view gap between pre- and post-occupancy evaluation. Overall, the pre- and post-occupation evaluation survey analyses supported the beneficial effects of IEQ in the renovated building. In conclusion, the study provides a thorough examination of the effect on occupant satisfaction with IEQ of the data-driven changes collected from pre- and post-occupancy evaluation surveys.