Measurement and comparison of thermal environment and ventilation performance under different heating air supply modes of wall attached ventilation and mixed ventilation

Experimentally investigates and compares the thermal environment and ventilation performance in detail under different heating modes of wall attached ventilation and mixed ventilation in an artificial thermal comfort laboratory. The results show that the phenomenon of upper hot and lower cold caused by indoor vertical temperature gradient is improved with wall attached ventilation, and the supply energy can be sufficiently utilized by the occupants, which is beneficial to reduce the heating energy consumption. The problem of indoor thermal discomfort caused by thermal buoyancy is effectively improved, such as more uniform indoor temperature distribution, smaller temperature difference between head and foot of human body, and smaller temperature non-uniformity coefficient. In addition, the air supply with large air volume and small temperature difference can alleviate and optimize the problem of uneven temperature distribution in the heating room in winter. Because the temperature distribution in the wall attached ventilation room is less sensitive to the change of air supply parameters under the condition of meeting the requirements of air supply accessibility, the engineering application is more adaptable.