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首页> 外文期刊>Building and Environment >The Effect Of Gradual Changes In Wind Speed Or Heat Load On Natural Ventilation In A Thermally Massive Building
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The Effect Of Gradual Changes In Wind Speed Or Heat Load On Natural Ventilation In A Thermally Massive Building

机译：风量或热负荷的逐渐变化对大型热建筑的自然通风的影响

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We examine the transitions in flow regime which can occur in naturally ventilated thermally massive buildings subject to changes in the wind and buoyancy forcing. For a range of heat loads there are both wind-dominated and buoyancy-dominated flow regimes. However, outside this range, only the steady state wind-dominated or buoyancy-dominated flow can develop. As a result of this non-linearity, and the different timescales for the evolution of the air and of the thermal mass, the transient evolution of the system caused by changes in either the heat load or the wind forcing can be complex. We develop a simplified model to identify the influence of the thermal mass on transitions in flow regime caused by changes in heat load or wind forcing. We show that the interior air responds rapidly to changes in the forcing, and as a result, the thermal mass can then act as a slowly evolving heat source or heat sink. In some situations this can lead to temporary buffering of the interior temperature, followed by a second, rapid transition in the interior temperature and ventilation regime as the system adjusts to the new steady state.
机译：我们研究了自然通风的大型建筑物在风和浮力变化作用下可能发生的流动状态转变。对于一定范围的热负荷，存在以风为主和以浮力为主的流动状态。但是，在此范围之外，只能形成稳态的风为主或浮力为主的流。由于这种非线性，以及空气和热质量演化的不同时间尺度，由热负荷或风强迫的变化引起的系统瞬态演化可能很复杂。我们开发了一个简化的模型，以确定热质量对由热负荷或风力变化引起的流动状态转变的影响。我们表明，内部空气对强迫的变化做出了快速响应，因此，热质量可以充当缓慢演化的热源或散热器。在某些情况下，这可能会导致内部温度的暂时缓冲，然后随着系统调整到新的稳定状态，内部温度和通风状态会发生第二次快速过渡。

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