CFD simulation of horizontal attachment distance and thermal environment characteristics of rooms with vertical wall

To solve the problem that the hot air tends to distribute at the top of the room causing inefficient energy consumption when heating with mixed ventilation mode in winter, studies the conditions of horizontal attachment distance meeting the design requirements under vertical wall attached ventilation heating mode by CFD numerical simulation method, and on this basis, analyses the indoor thermal environment characteristics under this heating mode.The research results in a 6.19 m (length) ×3.44 m (width) ×2.80 m (height) room show that the jet trajectory and range of vertical wall attached ventilation are dominated by inertial force, followed by thermal buoyancy within the air supply parameters of comfort air conditioning under winter heating conditions. If the horizontal attachment distance is greater than 80% of the room length, which means Ar<0.001 5, it is considered that the horizontal attachment distance reaches the air supply requirements.When the air supply velocity is greater than 4.14 m/s, a blowing sense at the personnel’s ankles may occur in the occupied zone below 0.5 m from the ground near the central shaft surface of the room, and the personnel should be arranged away from the position on the central shaft surface of the room that is closer to the air supply outlet. The hot air flows through the occupied zone firstly, and it can continuously compensate the heat loss of the enclosure structure of the room along the height direction. There is no obvious thermal stratification in the vertical direction, making the heat being utilized effectively.