Characteristic Research On The Thermal Pressure Ventilation Of Super High-rise Risedential Buildings At Severe Cold Region In Winter

In severe cold region, the stack effect of high-rise residential buildings in winter is obvious, bringing about a series of security problems, the increasing energy consumption, swishing and spreading of pollutants. Previous researches usually adopt the simulation method, and there is scarcely any filed measurement of stack effect in severe cold region of China. Taking the city of Harbin as an example, we chose three 100- meter high-rise buildings to carry out the field measurements of the air tightness of doors and windows and the distribution of thermal pressure in stairwells. And some work based on these measuring was conducted as follows:Firstly, a detailed measuring plan of air tightness was made; The air-tightness measuring result was compared with ASHRAE standard; According to three different planes of high-rise residential buildings, a kind of dimensionless method for pressure difference and air flow rates have been put forward, according to which we analyzed the measurement of the pressure difference;Secondly, the thermal pressure ventilation was simulated by the use of the CONTAM. We also compared the measured results of thermal pressure distribution and infiltration energy consumption with that of simulated results.Finally, by setting different values of air tightness, the thermal pressure distribution under different air tightness parameter was analyzed. The impact of ambient temperature on thermal pressure distribution and infiltration energy consumption was also studied by setting different values.This paper adopted both the field measurement and numerical simulation. The conclusions are as follows:The values of measured air tightness results are larger than that in ASHRAE standard, which is inconsistent with the actual conditions in China;The impact of opening and closing stairwell doors on thermal pressure ventilation is related to the plane of buildings, the structure of stai rwells and the air tightness. The pressure of stairwells tends to grow as rising of the height of opening doors; The larger the area at top of stairwell is, the weaker the impact of opening stairwell doors on the distribution of dimensionless difference will be; The pressure difference at 1st level will be greater if the air tightness of stairwell is poorer.The consistency between measured pressure difference and simulated results is related to the plane of buildings. The difference of measured and simulat ed results is more obvious when the plane of building is more complex and the space of stairwell is more restricted and vice versa.The air tightness of the lobby door at 1st level and the stairwell door do not affect the thermal pressure distribution from outdoors to stairwells. The former has bigger influence on internal partition door on the ground floor, and the latter has greater influence on the internal air flow.Infiltration energy consumption grows with the decrease of ambient temperature. When the ambient temperature gets-49 ℃, the infiltration energy consumption reaches 33.74 k W,which is about 3~4 times of that with the ambient temperature being-21.6℃.