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Inferring the thermal resistance and effective thermal mass of a wall using frequent temperature and heat flux measurements

Biddulph, P; Gori, V; Elwell, CA; Scott, C; Rye, C; Lowe, R; Oreszczyn, T; (2014) Inferring the thermal resistance and effective thermal mass of a wall using frequent temperature and heat flux measurements. ENERGY AND BUILDINGS , 78 10 - 16. 10.1016/j.enbuild.2014.04.004. Green open access

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Abstract

Evaluating how much heat is lost through external walls is a key requirement for building energy simulators and is necessary for quality assurance and successful decision making in policy making and building design, construction and refurbishment. Heat loss can be estimated using the temperature differences between the inside and outside air and an estimate of the thermal transmittance (U-value) of the wall. Unfortunately the actual U-value may be different from those values obtained using assumptions about the materials, their properties and the structure of the wall after a cursory visual inspection. In-situ monitoring using thermometers and heat flux plates enables more accurate characterisation of the thermal properties of walls in their context. However, standard practices require that the measurements are carried out in winter over a two-week period to significantly reduce the dynamic effects of the wall's thermal mass from the data. A novel combination of a lumped thermal mass model, together with Bayesian statistical analysis is presented to derive estimates of the U-value and effective thermal mass. The method needs only a few days of measurements, provides an estimate of the effective thermal mass and could potentially be used in summer.

Type: Article
Title: Inferring the thermal resistance and effective thermal mass of a wall using frequent temperature and heat flux measurements
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.enbuild.2014.04.004
Publisher version: http://dx.doi.org/10.1016/j.enbuild.2014.04.004
Additional information: © 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license(http://creativecommons.org/licenses/by/3.0/).
Keywords: External wall, U-Value, R-value, Thermal Mass, Bayesian Statistics, Heat Transfer, In-situ Measurements
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/1443257
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