Abstract: Since the development of household air conditioners, the traditional way of air outlet is that the cold air blows directly when cooling, and the head and feet are cold when heating. The comfort experience of the human body is poor, which has become a criticism of the industry. Taking the cabinet air conditioner as an example, CFD software is used to simulate the cooling and heating temperature field of a cabinet air conditioner with upper and lower cooling and heating air outlets that has been mass produced, taking the height of Chinese people as the experimental object. By observing the sweeping trajectory curve of the cold air, it is found that the experimental cabinet will not directly blow to people. In addition, through the analysis of the vertical temperature difference change and temperature uniformity of the simulation space. This cabinet machine can reduce the indoor temperature to a comfortable temperature within 30 minutes. At the same time, the cabinet machine and the traditional cabinet machine are tested for thermal comfort. Through the analysis of experimental data, it is verified that the vertical temperature difference changes less when hot air is delivered from top to bottom at the same time, and the heating temperature uniformity of the whole space is higher. Comprehensive simulation results show that the upper and lower cold and hot air outlet cabinet air conditioner have the best cooling and heating comfort.

Key words: Cabinet air conditioner, Cold and warm air, Temperature equalization, Comfortable wind feeling