Study on influence of local humidification on distribution characteristics of indoor humidity field under different environmental pressures

Understanding the influence of environmental pressure on the indoor humidity field created by local humidifiers is a key link in improving the indoor humidity environment in the Qinghai-Xizang Plateau. Based on the plateau extreme environment simulation chamber experimental platform, this paper studies the characteristics of the indoor humidity field created by the gas-phase humidifier and the gas-liquid two-phase humidifier with time, horizontal distance and height under the environmental pressure conditions of 60, 80, 95 kPa. The results show that in a low-pressure environment, the absolute humidity of the air in the indoor humidity field created by the humidifier is relatively high. In the indoor humidity field created by the gas-phase humidifier, the absolute humidity of the air shows a decreasing trend with the increase of height. For every 10 kPa decrease in the environmental pressure, the average absolute humidity at the longitudinal section of the gas-phase humidifier outlet increases by 0.17 g/m3. When the environmental pressure is 60 kPa, the absolute humidity difference at the cross section of the gas-liquid two-phase humidifier outlet can reach 1.36 g/m3. When the environmental pressure is 95 kPa and the humidification amount and humidification time are the same, the section average absolute humidities of the gas-liquid two-phase humidifier at different height cross-sections are higher than those of the gas-phase humidifier.