Galbraith, G H; McLean, R C and Kelly, D (1997) Moisture permeability measurements under varying barometric pressure. Building Research & Information, 25(6), pp. 348-353. ISSN 0961-3218
Abstract
Experimental methodology is developed for measuring moisture permeability of vapour and liquid. The development of theories to describe combined heat and moisture transport through porous media has been the subject of a large volume of research over recent years. These theories are important for many areas of study including the investigation of the hygrothermal performance of building envelopes. This paper highlights the difficulties of obtaining separate values for the material vapour and liquid transfer coefficients, a knowledge of which is essential if combined heat and mass transport models are to be accurately solved. The determination of these individual coefficients is not possible using existing measurement methods which enable only a total moisture permeability to be measured with the liquid and vapour flux components combined. The possibility of carrying out measurements under varying barometric pressures to obtain this data is investigated and experimental results using particle board as a test material are reported and compared with results from a previously developed analytical approach.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | moisture; permeability materials; testing; UK; water vapour |
| Index terms: | permeability, hygrothermal performance, investigation, media, methodology, measurement method, building envelope, testing |
| Subjects: | research methods, architectural elements, material properties and characteristics, sociology, data collection methods, financial and cost management, professional practice |
| Topics: | Cost Management, Engineering Principles, Construction Materials, Research Practice, Design Practice |
| Descriptive scope: | 4 PCTA |
N.B. Descriptive scope is a count of how many of the five facets of empirical research are indicated by the words used in title, abstract and keywords. It is not intended as a judgement on the research; merely a count of the kind of word we would expect to indicate Phenomenon, Concepts, Theoretical framing, Empirical techniques, Analytical techniques. If all five are present, then a code of “5 PCTEA” will indicate this. If you feel the coding for this record is questionable, we welcome discussion around the terms we matched or the way we categorized them. The facet you would expect may not be coded, or a facet may be coded inappropriately. This can also bear on a larger question, of which facets should be treated as defining in construction management research. Please get in touch, and we will look at it. More details here