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Published in:
Constructional Design Read chapter Read first chapter

2024 | OriginalPaper | Chapter

27. Hygrothermal Functions

Author : José Luis Moro

Published in: Building-Construction Design - From Principle to Detail

Publisher: Springer Berlin Heidelberg

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Abstract

 Hygrothermal functions ensure that the required environmental conditions are met which need to be guaranteed in order for the interior spaces to be habitable, safe, and healthy. This pertains basically envelope components, both interior and exterior. From a constructional point of view, the most important factor influencing the physical appropriateness of a particular envelope component in this respect is its specific layering from different materials. Depending on the material properties of the layers, certain sequences are unobjectionable from a point of view of buildings physics, other, in contrast, are potentially failure-prone and hence need to be avoided in constructional design. A proper knowledge of the physical processes governing the behavior of surface components separating spaces with a gradient of different media or physical conditions is therefore fundamental to a successful detail design.

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previous chapter Force Transmission
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Footnotes
1
In the absence of an introduced term, we propose the term of vapour trap since this mechanism is so dangerous because it impedes water vapour from diffusing out of the construction.
 
2
Although the term vapour control has not yet been widely used in technical parlance, we propose introducing it as an adequate concise description of this function.
 
3
Even though the focus of the work is on building construction, not on building physics per se (this is not a building-physics textbook), it still seems appropriate to recall the essential parameters of hygrothermal processes. This is particularly helpful in order to better understand and apply the normative requirements to be discussed in the following. It must be emphasised, however, that the balancing encompassing the entire building, as it is carried out in the EnEV, cannot be dealt with in more detail in this context.
 
4
EN ISO 10211 defines the temperature factor at the indoor surface as the “difference between the temperature of the indoor surface and the outdoor air temperature divided by the temperature difference between the indoor and outdoor air, calculated with a heat transfer resistance Rsi at the indoor surface” (3.14).
 
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Metadata
Title
Hygrothermal Functions
Author
José Luis Moro
Copyright Year
2024
Publisher
Springer Berlin Heidelberg
Book
Building-Construction Design - From Principle to Detail

Print ISBN: 978-3-662-61741-0

Electronic ISBN: 978-3-662-61742-7

Copyright Year: 2024

DOI
https://doi.org/10.1007/978-3-662-61742-7_27