Research on improvement of vertical temperature gradient in large shopping malls

In winter, thermal pressure in large shopping malls promotes the heat air rising from the bottom of the layer, forming a large vertical temperature gradient, which causes the hot in top and cold in bottorn and thermal discomfort. Combining temperature measurement in a shopping mall in Nanjing with CFD numerical simulation, presents a new method to reduce the vertical temperature gradient in large shopping malls. The measured results show that the vertical temperature difference is reduced from 3.8 ℃ to 1.3 ℃ by adopting the air adjusting control. Numerical simulation results show that the vertical temperature difference is reduced from 3.1 ℃ to 0.6 ℃ by reducing the top air supply, increasing the bottom air supply, and installing the baffles on the first layer, which effectively improves  the uniformity and comfort of the indoor temperature.