隐蔽室内微环境中空气流动的原因:对历史书架的测量。

UCL open environment Pub Date : 2024-09-25 eCollection Date: 2024-01-01 DOI:10.14324/111.444/ucloe.1976
Morena Ferreira, Josep Grau-Bové, Nigel Blades, Lisa O'Hagan, Hector Altamirano
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引用次数: 0

摘要

国民托管组织提出在小型微环境中使用通风孔,作为改善书架内湿度和温度环境条件的一种机制。在国家信托基金的一处历史遗产中,这种机制被用来促进书本后面的空气流动,作为降低霉菌生长风险的一种可能策略。人们相信,将通风孔作为一种被动的设计方案来促进微环境中的空气流动,可以防止历史建筑档案发生腐烂。本文通过对三座国民托管历史图书馆的实地测量,研究了造成书架背后气流的机理。测量结果表明,书架后可以被动地产生微小但可测量的速度,最高可达 4 厘米/秒。这种密闭微环境中的空气流动可能是由墙壁和书架内外温差引起的自然对流和周围环境气流引起的强制对流共同造成的。虽然在某些情况下一种机制占主导地位,但在大多数情况下两种机制可能同时存在。要弄清表面温度是如何驱动书架后面的空气运动的,还需要进一步的研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The causes of air movement in hidden indoor micro-environments: measurements in historic bookshelves.

The use of ventilation holes in small micro-environments has been proposed by the National Trust as a mechanism to improve the environmental conditions of moisture and temperature within bookshelves. At one National Trust historic property, this mechanism has been used to encourage air movement behind books as a possible strategy to reduce the risk of mould growth. It is believed that including ventilation holes as a passive design solution to promote airflow within micro-environments could prevent decay from occurring in the archives of historic buildings. This paper investigates the mechanisms that cause airflow behind bookshelves using field measurements in three National Trust historic libraries. The measurements indicate that small but measurable velocities, up to 4 cm/s, can be passively generated behind bookshelves. Air movement in such confined micro-environments is probably caused by a combination of natural convection, caused by temperature differences between the walls and the interior and the exterior of the bookshelf, and forced convection due to drafts in the surrounding environment. While in some cases one mechanism prevailed, both mechanisms may be present simultaneously in most cases. Further research is needed to clarify how surface temperature drives air motion behind shelves.

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