Experimental study on thermal environment in heating room with impinging jet ventilation system

In a phytotron, conducts a series of experiments to study the heating effects with impinging jet ventilation (IJV) and mixing ventilation (MV) under different air supply conditions respectively. Analyses the influences of air supply velocity and temperature on thermal environment in heating room with two ventilation modes, and compares indoor thermal comfort. The results indicate that the vertical temperature gradient in an IJV room is smaller than that in a MV room, because the downward air flow of the IJV helps in distributing the warm air down to lower levels. The temperature stratification is less sensitive to different air supply states in an IJV room than that in a MV room, and thus it has a significant impact on decreasing the heating energy consumption of buildings. The velocity is higher in lower part near the nozzle in the IJV room, which may lead to a higher draught risk than that in the MV room, but the experimental results show that the thermal environment is acceptable in the occupied zone of the IJV room during the whole test period.