共查询到19条相似文献,搜索用时 46 毫秒
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分别使用压力衰减法和恒压法对高等级生物安全实验室围护结构进行了气密性测试,并对测试结果进行了理论计算及对比分析。结果表明:就同一受试对象而言,对于固定时间内通过压力衰减法计算所得的气密性测试结果,始终存在按照某一等效压差进行的恒压法测试结果与其相对应,但受仪器测试精度、环境温度、测试对象体积影响,2种方法实测泄漏率结果存在一定差异;就检测方法而言,2种方法之间并不存在哪种方法更严格的情况;就测试结果而言,在明确压力衰减法评价标准及保证受试对象体积准确的前提下,如使用恒压法按照流动指数近似为1.0确定的等效压差进行气密性测试得到的结果能够满足评价标准,则压力衰减法测试结果必然能够满足对应评价标准。 相似文献
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在渗风量计算中,由于渗风上各重门窗渗风特性指数b值的差别,而使渗风量的计算变得非常复杂,若能将b值取为定值,就可使计算大为简化。本文应用计算机程序,以二分法的迭代方法,通过实例分析了各重门窗缝隙b值变化对空气渗透的影响,文章指出,在空气渗透计算中,对于具有多重门窗阻隔的情况,将各重门窗缝隙b值取为定值(b0=2/3)是可行的。 相似文献
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针对三座高等级生物安全实验室的结构设计,客观地分析和比较了每一座实验室的结构选型及设计中尚待解决的问题;阐述了不同结构形式的优缺点,较为详细地介绍了一种现在被业界一致公认为新一代P4的首创的高等级生物安全四级实验室的结构——盒子中的盒子的设计理念。 相似文献
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研究了空气渗透作用下房屋围护材料层的湿性态,导出了材料层中水蒸汽分压力的分布,说明了由于空气对材料层的渗透,使得水蒸汽分压力的分出现了偏差,这种偏差能够解释自然通风状态下外墙的燥湿现象,从而弥补了现有理论的不足。 相似文献
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This paper presents a comprehensive study of the thermal performance of the diffusive building envelope. As the infiltration air moves through the building envelope, it exchanges heat with the solid matrix. The temperature profile in the building envelope deviates from that of pure conduction, because of the heat exchange between infiltrated air and solid matrix. Numerical study was carried out to determine the contribution of air infiltration to the heat gain/loss through the diffusive building envelope. The model validation process was carried out at two different levels: inter-model comparison; validation with experimental data. At the inter-model level, the infiltration heat exchange efficiency of a wall was compared with the infiltration heat exchange efficiency predicted by an existing model in the literature. The results show good agreement between two models. The second level of validation compares the model's prediction with the existing experimental data. The results confirm that there are excellent agreement between prediction made by the numerical model and the experimental data. 相似文献
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生物安全实验室暖通空调系统的几个设计要点 总被引:1,自引:1,他引:0
介绍了生物安全实验室特有的安全运行要求。分析了系统运行中的主要故障,给出了最不利状况即排风系统停机故障、排风设备自动切换时,避免房间出现正压的部分设计原则。 相似文献
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J.H. Klems 《Energy and Buildings》1983,5(4):243-252
The mechanism of air infiltration is reviewed as background for introducing a procedure that yields more reliable estimates of average infiltration rates through a window unit than do methods currently employed. The procedure is applied to estimating the average winter heat losses through windows in low-rise residential buildings variuosly located throughout the United States. It is concluded that, regardless of climate, the heat loss attributable to infiltration through the window unit is small compared with that incurred as a result of direct transmission of heat through the window. 相似文献
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一幢已交付使用的高层建筑1 ̄4层室温过低,经分析发现主要是由热压、风压及门窗不严密所致。采取有效的内部隔断措施后情况大为改观。 相似文献