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Sustainability 2015, 7(8), 10388-10398; doi:10.3390/su70810388

In Situ Thermal Transmittance Measurements for Investigating Differences between Wall Models and Actual Building Performance

Department of Engineering, University of Roma TRE, via Vito Volterra 62, Rome 00146, Italy
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Academic Editors: Francesco Asdrubali and Pietro Buzzini
Received: 19 June 2015 / Revised: 23 July 2015 / Accepted: 28 July 2015 / Published: 5 August 2015
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Abstract

An accurate assessment of a building’s wall performance, defined through the thermal transmittance, is essential to compute the annual energy consumption. Analyzing opaque surfaces, the heat transfer across walls can be modeled by an electro-thermal analogy, based on resistors series, crossed by a one-dimensional heat flow. This analogy is well established and it refers to stratigraphy composed of homogeneous materials. When dealing with inhomogeneous materials, possibly including hollow bricks, the wall’s thermal transmittance is evaluated by means of an effective conductance. However, in order to verify the theoretical models effectiveness, a comparison with in situ measurements is needed. In this paper, three building walls characterized by different stratigraphy have been analyzed; by employing a heat flow meter investigation. Measurements results and estimated thermal transmittance values—calculated applying the standard UNI EN ISO 6946—have been compared. View Full-Text
Keywords: wall thermal transmittance; in situ measurements; heat-flow meter wall thermal transmittance; in situ measurements; heat-flow meter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Evangelisti, L.; Guattari, C.; Gori, P.; Vollaro, R.D.L. In Situ Thermal Transmittance Measurements for Investigating Differences between Wall Models and Actual Building Performance. Sustainability 2015, 7, 10388-10398.

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