Investigation of a simple approach to predict rainscreen wall ventilation rates for hygrothermal simulation purposes
(2014) In Building and Environment 73(March). p.88-96- Abstract
- Hygrothermal simulation programs are commonly used by design engineers to analyse moisture performance of building envelopes. For ventilated assemblies, programs typically require the user to enter cavity ventilation rates. If such input data are not prepared on physical grounds, it can impair the quality of the simulation results. In earlier papers: (1) estimations of ventilation rates in experimental walls based on cavity air velocity measurements; (2) comparative calculations based on monthly and annual tabular climate data, a simple driving force model and models of cavity airflow and heat balance, have been presented. In this study, the models and hourly climate field data were used to perform calculations of transient cavity... (More)
- Hygrothermal simulation programs are commonly used by design engineers to analyse moisture performance of building envelopes. For ventilated assemblies, programs typically require the user to enter cavity ventilation rates. If such input data are not prepared on physical grounds, it can impair the quality of the simulation results. In earlier papers: (1) estimations of ventilation rates in experimental walls based on cavity air velocity measurements; (2) comparative calculations based on monthly and annual tabular climate data, a simple driving force model and models of cavity airflow and heat balance, have been presented. In this study, the models and hourly climate field data were used to perform calculations of transient cavity ventilation rates for comparison with previous experimental results. For 13 different time periods extending from 24 to 91 hours, the calculated average ventilation rates were within or very close to the experimentally estimated limits for the ventilation rate. Additionally, the calculations captured the temporal variability and the physical cause of ventilation airflow in the cavities reasonably well. The applied calculation methodology can be developed into a user friendly approach to estimate realistic ventilation rate input data for hygrothermal purposes. Limitations and possible improvements of the methodology are discussed. The influence of the accuracy and resolution of the ventilation rate input data in simulations is demonstrated in a case study. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4248968
- author
- Falk, Jörgen LU ; Molnar, Miklos LU and Larsson, Oskar LU
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- rainscreen wall, ventilated cavity, air change rate, ventilation rate modelling, hygrothermal simulation
- in
- Building and Environment
- volume
- 73
- issue
- March
- pages
- 88 - 96
- publisher
- Elsevier
- external identifiers
-
- wos:000331991700009
- scopus:84890885926
- ISSN
- 1873-684X
- DOI
- 10.1016/j.buildenv.2013.11.025
- language
- English
- LU publication?
- yes
- id
- 8e2dc4c5-8b66-4b7b-9549-96e4f2dd731c (old id 4248968)
- date added to LUP
- 2016-04-01 10:28:55
- date last changed
- 2022-03-12 06:19:08
@article{8e2dc4c5-8b66-4b7b-9549-96e4f2dd731c,
abstract = {{Hygrothermal simulation programs are commonly used by design engineers to analyse moisture performance of building envelopes. For ventilated assemblies, programs typically require the user to enter cavity ventilation rates. If such input data are not prepared on physical grounds, it can impair the quality of the simulation results. In earlier papers: (1) estimations of ventilation rates in experimental walls based on cavity air velocity measurements; (2) comparative calculations based on monthly and annual tabular climate data, a simple driving force model and models of cavity airflow and heat balance, have been presented. In this study, the models and hourly climate field data were used to perform calculations of transient cavity ventilation rates for comparison with previous experimental results. For 13 different time periods extending from 24 to 91 hours, the calculated average ventilation rates were within or very close to the experimentally estimated limits for the ventilation rate. Additionally, the calculations captured the temporal variability and the physical cause of ventilation airflow in the cavities reasonably well. The applied calculation methodology can be developed into a user friendly approach to estimate realistic ventilation rate input data for hygrothermal purposes. Limitations and possible improvements of the methodology are discussed. The influence of the accuracy and resolution of the ventilation rate input data in simulations is demonstrated in a case study.}},
author = {{Falk, Jörgen and Molnar, Miklos and Larsson, Oskar}},
issn = {{1873-684X}},
keywords = {{rainscreen wall; ventilated cavity; air change rate; ventilation rate modelling; hygrothermal simulation}},
language = {{eng}},
number = {{March}},
pages = {{88--96}},
publisher = {{Elsevier}},
series = {{Building and Environment}},
title = {{Investigation of a simple approach to predict rainscreen wall ventilation rates for hygrothermal simulation purposes}},
url = {{http://dx.doi.org/10.1016/j.buildenv.2013.11.025}},
doi = {{10.1016/j.buildenv.2013.11.025}},
volume = {{73}},
year = {{2014}},
}