Abstract Motivated by intentions of avoiding large net fluid flow and enabling a more practical airtightness test for large buildings, a low-pressure Pulse pressurisation technique was developed for measuring building airtightness at pressures that are considered more representative of that experienced by buildings under natural conditions. Due to the short and dynamic operation, this technique is able to minimize wind and buoyancy effects during the measurement of building pressure. The investigation, based on the “quasi-steady” temporal inertia model, explores a technique that generates a pressure pulse inside a building by releasing a known amount of air pulse over 1.5 s using a compressed air tank. The volumetric flow rate of the air pulse released from the tank is obtained by measuring the transient pressure in the air tank during a test run. The air leakage through the building envelope is then obtained by accounting for the compressibility of indoor air. Simultaneously, the pressure variation within the envelope of test building is monitored. Therefore, the leakage-pressure relationship of the building envelope can be obtained. The validity of the theoretical model and the assumptions on which the model is based are validated using experimental and numerical investigations.

中文翻译：

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基于喷嘴的脉冲技术确定建筑气密性的理论基础的数值和实验验证

摘要 出于避免大的净流体流动和对大型建筑物进行更实用的气密性测试的意图，开发了一种低压脉冲加压技术，用于在被认为更能代表建筑物在自然条件下所经历的压力下测量建筑物的气密性。由于操作时间短且动态，因此该技术能够在建筑压力测量期间最大限度地减少风和浮力的影响。该调查基于“准稳态”时间惯性模型，探索了一种技术，该技术通过使用压缩空气罐在 1.5 秒内释放已知量的空气脉冲来在建筑物内产生压力脉冲。通过在测试运行期间测量储气罐中的瞬态压力获得从储气罐释放的空气脉冲的体积流量。然后通过考虑室内空气的可压缩性来获得通过建筑围护结构的空气泄漏量。同时，监测测试建筑围护结构内的压力变化。因此，可以得到建筑围护结构的泄漏压力关系。理论模型的有效性和模型所基于的假设通过实验和数值研究得到验证。