TY - JOUR
T1 - Modeling ventilation rates in bedrooms based on building characteristics and occupant behavior
AU - Bekö, Gabriel
AU - Toftum, Jørn
AU - Clausen, Geo
PY - 2011
Y1 - 2011
N2 - Air change rate (ACR) data obtained from the bedrooms of 500 Danish children and presented in an
earlier paper were analyzed in more detail. Questionnaires distributed to the families, home inspections
and interviews with the parents provided information about a broad range of residential characteristics
and occupant behavior. These were tested in several linear regression models to identify the degree of
effect each selected independent variable has on the total ACR. The measured ACRs are summarized by
some of the most significant variables such as room volume (higher ACR in smaller rooms), number of
people sleeping in the bedroom (higher ACR with more people), average window and door opening
habits (higher ACR with more opening), sharing the bedroom with other family members (higher ACR in
shared rooms), location of the measured room (higher ACR above ground floor), year of construction
(lowest ACR in buildings from early 1970s), observed condensation on the bedroom window (higher ACR
at less condensation), etc. The best-fitting model explained 46% of the variability in the air change rates.
Variables related to occupant behavior were stronger predictors of ventilation rate (model R2 ¼ 0.30)
than those related to building characteristics (model R2 ¼ 0.09). Although not perfectly accurate on
a room-to-room basis, our best-fitting model may be useful when a rough estimate of the average air
change rate for larger study populations is required in future indoor air quality models.
AB - Air change rate (ACR) data obtained from the bedrooms of 500 Danish children and presented in an
earlier paper were analyzed in more detail. Questionnaires distributed to the families, home inspections
and interviews with the parents provided information about a broad range of residential characteristics
and occupant behavior. These were tested in several linear regression models to identify the degree of
effect each selected independent variable has on the total ACR. The measured ACRs are summarized by
some of the most significant variables such as room volume (higher ACR in smaller rooms), number of
people sleeping in the bedroom (higher ACR with more people), average window and door opening
habits (higher ACR with more opening), sharing the bedroom with other family members (higher ACR in
shared rooms), location of the measured room (higher ACR above ground floor), year of construction
(lowest ACR in buildings from early 1970s), observed condensation on the bedroom window (higher ACR
at less condensation), etc. The best-fitting model explained 46% of the variability in the air change rates.
Variables related to occupant behavior were stronger predictors of ventilation rate (model R2 ¼ 0.30)
than those related to building characteristics (model R2 ¼ 0.09). Although not perfectly accurate on
a room-to-room basis, our best-fitting model may be useful when a rough estimate of the average air
change rate for larger study populations is required in future indoor air quality models.
U2 - 10.1016/j.buildenv.2011.05.002
DO - 10.1016/j.buildenv.2011.05.002
M3 - Journal article
VL - 46
SP - 2230
EP - 2237
JO - Building and Environment
JF - Building and Environment
SN - 0360-1323
IS - 11
ER -