In this study, CFD simulations incorporating Variational Continuous Assimilation (VCA) method were performed in order to understand indoor environment of a generic health services facility and to estimate demand of humidification. Before performing the simulations, an observation of temperature, humidity and velocity was performed at the facility. The observed data indicate that the relative humidity was low although some humidifiers were working. In order to determine the cause and countermeasure of this, the CFD simulations were performed. According to the result of CFD simulations, the low relative humidity is caused by large amount of ventilation, inappropriate location of humidifiers and shortage of humidification. Based on this result, the demand of humidification was estimated by the CFD simulations incorporating the VCA method.
