Journal
ENERGY AND BUILDINGS
Volume 182, Issue -, Pages 88-110Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2018.10.021
Keywords
Thermal transmittance; U-value; Heat flow meter; Guarded hot plate; Guarded hot box; Calibrated hot box; Infrared thermography
Funding
- FEDER funds through the Competitiveness Factors Operational Programme - COMPETE
- FCT - Foundation for Science and Technology [CENTRO-01-0145-FEDER-000006]
- FEDER funds through the COMPETE 2020 - Operational Programme for Competitiveness and Internationalization (POCI)
- FCT [POCI-01-0145-FEDER-016750 \ PTDC/EMS-ENE/6079/2014]
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The experimental characterization of the overall thermal transmittance of homogeneous, moderately-and non-homogeneous walls, windows, and construction elements with innovative materials is very important to predict their thermal performance. It is also important to evaluate if the standard calculation methods to estimate the U-value of new and existing walls can be applied to more complex configurations, since the correct estimation of this value is a critical requirement when performing building energy simulations or energy audit. This paper provides a survey on the main methods to measure the thermal transmittance and thermal behavior of construction elements, considering laboratory conditions and in situ non-destructive measurements. Five methods are described: the heat flow meter (HFM); the guarded hot plate (GNP); the hot box (HB), considering the guarded HB (GHB) and the calibrated HB (CHB); and the infrared thermography (IRT). Then, previous studies dedicated to the assessment of the thermal performance of different heavy- and light-weight walls are discussed. Particular attention is devoted to the measurement of the U-value of non-homogeneous walls, including the effect of thermal bridging caused by steel framing or mortar joints, and the presence of PCMs or new insulation materials in the configuration of the walls. (C) 2018 Elsevier B.V. All rights reserved.
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