TY - JOUR
T1 - In-situ characterization of walls’ thermal resistance
T2 - An extension to the ISO 9869 standard method
AU - Rasooli, Arash
AU - Itard, Laure
PY - 2018
Y1 - 2018
N2 - Accurate and reliable in-situ characterization of buildings’ thermal envelope is of high significance to determine actual energy use and thermal comfort. In this context, walls’ thermal resistance is one of the most critical properties to be identified. Regardless the numerous studies being carried out to accurately measure the actual thermal resistance of walls on site, the heat flow meter method suggested by the ISO 9869 standard is the one being applied the most. The method requires one heat flux sensor and two thermocouples to measure and estimate the average thermal resistance over a sufficiently long period. Despite the advantages of this method, two problems have been seen in practice: long duration and precision problem. The present article describes and demonstrates how modifications to this standard method can improve the results of the in-situ measurements in terms of duration and precision. Simulations and experiments have been applied to show the effect of using an additional heat flux sensor, opposite to the first one. The modified method aids in obtaining the thermal resistance with a higher precision in a shorter period of time.
AB - Accurate and reliable in-situ characterization of buildings’ thermal envelope is of high significance to determine actual energy use and thermal comfort. In this context, walls’ thermal resistance is one of the most critical properties to be identified. Regardless the numerous studies being carried out to accurately measure the actual thermal resistance of walls on site, the heat flow meter method suggested by the ISO 9869 standard is the one being applied the most. The method requires one heat flux sensor and two thermocouples to measure and estimate the average thermal resistance over a sufficiently long period. Despite the advantages of this method, two problems have been seen in practice: long duration and precision problem. The present article describes and demonstrates how modifications to this standard method can improve the results of the in-situ measurements in terms of duration and precision. Simulations and experiments have been applied to show the effect of using an additional heat flux sensor, opposite to the first one. The modified method aids in obtaining the thermal resistance with a higher precision in a shorter period of time.
KW - Heat flux sensor
KW - Heat transfer simulation
KW - In-situ measurement
KW - ISO 9869 standard
KW - Thermal resistance
UR - http://www.scopus.com/inward/record.url?scp=85054179856&partnerID=8YFLogxK
U2 - 10.1016/j.enbuild.2018.09.004
DO - 10.1016/j.enbuild.2018.09.004
M3 - Article
SN - 0378-7788
VL - 179
SP - 374
EP - 383
JO - Energy and Buildings
JF - Energy and Buildings
ER -