Heat Flow in Building Components, Experiment and Analysis
Author
Summary, in English
An outer ambient wall with a window were studied with both theoretical analyses and measurements performed under conditions with natural climate. The method used was to estimate the heat flow through wall and window from measured temperatures and solar radiation. The longwave radiation was calculated from surface temperatures. The convective heat transfer was calculated as the difference between the heat flow through the building element and the longwave radiation. With the one-dimensional dynamic heat transfer model for the window which included shortwave radiation it was possible to measure the continuous heat flow through a window from temperature sensors and solar radiation measurements. With the one-dimensional finite difference model for the heat transfer through the wall it was possible to calculate the heat flow through a wall from temperature sensors. It was possible to continuously measure the convective heat transfer coefficient on the inner surface of a wall or a window. The accuracy was not very good: at best ±15% for the window and ± 20% for the wall. Even with this low accuracy the effect of different heating and ventilation strategies on the inside could clearly be detected. The results showed that the importance of the ventilation design and the position of the radiator is crucial. Local convective heat transfer coefficients may be more than 10 times the expected, due to ventilation or position of the radiator.
Department/s
Publishing year
1998
Language
English
Publication/Series
Report TABK
Volume
1016
Full text
- Available as PDF - 562 kB
- Download statistics
Document type
Dissertation
Publisher
Department of Building Science, Lund Institute of Technology
Topic
- Building Technologies
Keywords
- radiation exchange
- longwave
- shortwave
- transient
- frequency analysis
- finite difference
- measurements
- wall
- window
- heat transfer coefficient
- convective
- full scale
- natural climate
- in situ
- counter flow insulation
- heat transfer
- dynamic insulation
- temperature
- building
- solar radiation
- window model
- Building construction
- Byggnadsteknik
Status
Published
Supervisor
- [unknown] [unknown]
ISBN/ISSN/Other
- ISSN: 1103-4467
- ISBN: ISSN 1103-4467
- ISRN: LUTADL/TABK--1016--SE
Defence date
11 June 1998
Defence time
10:15
Defence place
Auditorium B, School of Architecture
Opponent
- Per Olaf Tjelflaat (Ph D)