Analysis of the Effects of Ventilation Method on Indoor Humidity Distribution and Condensation by CFD method

People spend 70% -90% of their time indoors. Indoor air quality and human body’s health have a close relationship. With the advance of society, user comfort requirements for thermal environment are rising. Humidity is an important parameter for evaluating indoor air quality, which not only affects the thermal comfort of the human body but also seriously restricts the function of the building. In winter, the indoor humidity is dry. When using humidifier, the humidity around the humidifier is higher, but there is still a dry area in the room. It is necessary to study the placement, blowing direction and capacity of the humidifier. In addition, when the room air supply method is different, the indoor humidity distribution is also slightly different. In recent years, with the development of large capacity, high speed of computer, CFD technology has been used to simulate air flow organization. It is possible to simulate the airflow organization, temperature and humidity of the building air conditioning system by using CFD technology. 

This paper the effects of different ventilation methods and different humidifier placement positions on the indoor humidity distribution of single room. And exploring the effects of condensation on different ventilation modes. 

1. The model can realistically simulate the effect of ventilation on the condensation distribution.
2. Within the scope of the nearby, the air just can hold limited capacity water vapor. The humidifier working efficiency was infected by the different position of humidifiers. 
3. The humidity distribution in the room is related to the ventilation mode, and the flow pattern of the indoor airflow affects the distribution of indoor humidity.