Field studies to investigate Impact of increasing R-value of building envelope on winter indoor relative humidity of Auckland houses
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Authors
Su, Bin
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Date
2016-11
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Conference Contribution - Paper in Published Proceedings
Ngā Upoko Tukutuku (Māori subject headings)
Keyword
building envelope
indoor health
insulation
houses
relative humidity
indoor moisture control
indoor health
insulation
houses
relative humidity
indoor moisture control
ANZSRC Field of Research Code (2020)
Citation
Su, B. (2016, November). Field Studies to Investigate Impact of Increasing R-value of Building Envelope on Winter Indoor Relative Humidity of Auckland Houses. Miller, W. (Ed.), Healthy Housing 2016: Proceedings of the 7th International Conference on Energy and Environment of Residential Buildings (pp.351-358).
Abstract
PURPOSE / CONTEXT
The study investigates relationships of winter indoor relative humidity and R-value of building envelope of the Auckland houses.
METHODOLOGY / APPROACH
Field study of indoor micro climatic conditions. Air temperatures and relative humidity adjacent to floors and ceilings of different indoor spaces of the two houses with different R-value in their envelopes and shaded outdoor spaces were continuously measured and recorded at 15 minute intervals, 24 hours a day, by Lascar EL-USB-2 USB Humidity Data Logger during the winter months.
RESULTS
The study identifies the differences of winter indoor relative humidity of Auckland houses with different insulation and glazing in their envelopes and the major problems of building thermal design of local house with lightweight timber frame construction.
KEY FINDINGS / IMPLICATIONS
Increasing R-value in building envelope of Auckland houses in accordance with the requirements from NZS 4218:1996 to NZS 4218:2009 can significantly in- crease 19.6% of winter time when indoor relative humidity are 40% and 60%. Maintaining indoor relative humidity between 40% and 60% can minimize the indirect health effects.
ORIGINALITY
Quantitative relationships between R-value in building envelope and winter indoor relative humidity, and the identified thermal design problems of local houses with lightweight timber frame construction can be good references for improving indoor health conditions of the future Auckland housing development.
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© 2017 Analysis & Policy Observatory (APO), licensed under a Creative Commons Attribution-Non-Commercial 3.0 Australia (CC-BY-NC 3.0 AU) License [from http://apo.org.au/node/68801]