Abstract
In order to study the influence of the heat dissipation of the outdoor unit in the groove of the highrise building. Numerical simulation of the thermal environment of a high-rise building is carried out. The results show that: When the outdoor mean wind speed is 2.7m/s, the maximum inlet air temperature of the outdoor unit under full load condition is about 43.3 °C, which is 2 °C lower than that under no wind condition. The monsoon is beneficial to the heat dissipation of the outdoor unit. When the hot air in the building groove rises, the corner flow is induced at the lower side of the refuge layer. Due to the reverse pressure gradient, the flow separation occurs, resulting in the blockage in the flow channel. When the air flows through the refuge layer, the flow expands suddenly due to the increase of the cross-section of the channel. The turbulent boundary layer is separated. The vortex region is induced on the upper side of the refuge layer. Since the heat on the upper and lower sides of the refuge floor cannot be effectively dissipated, the inlet air temperature of the outdoor unit is higher than that of other floors, which reduces the working efficiency of the outdoor unit.
Highlights
Multi-split air conditioning system is highly automated and flexible, which is widely used in high-rise buildings [1,2]
The wind environment directly affects the microclimate of the urban environment and people's comfort, so the wind environment should be considered in the planning and design of super high-rise buildings
PHOENICS numerical simulation software is used to study the distribution of heat dissipation and the working conditions of the outdoor units in the groove of high-rise buildings
Summary
Multi-split air conditioning system is highly automated and flexible, which is widely used in high-rise buildings [1,2]. The structure and distribution of high-rise buildings are relatively complicated. There are few studies on the air distribution of air conditioning systems in super high-rise residential buildings [3,4]. The heat cannot be dissipated in time, which increases the return air temperature of the outdoor unit. The lateral exhaust or upper exhaust of the outdoor units on low floors may affect the return air temperature environment of adjacent upper units, resulting in an airflow short circuit. It is necessary to study the heat dissipation of the outdoor unit in high-rise buildings. PHOENICS numerical simulation software is used to study the distribution of heat dissipation and the working conditions of the outdoor units in the groove of high-rise buildings
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