U-value assessment by infrared thermography: A comparison of different calculation methods in a Guarded Hot Box

Iole Nardi, Domenica Paoletti, Dario Ambrosini, Tullio De Rubeis, Stefano Sfarra

Research output: Contribution to journalArticle

44 Citations (Scopus)


The thermal transmittance (U-value) of the vertical opaque building envelope plays a key role for the evaluation of the thermal performance of a structure. In order to speed up the assessment procedure and to investigate wider portions of buildings directly in situ, new methods based on the use of quantitative infrared thermography have been proposed during the last years. Although the studies agree about the influence of the operative conditions, a detailed report, based on measurements effected on a large wall in a controlled environment and at different boundary conditions, is still missing in literature. The aim of this work is to assess the validity of thermographic methods by using different operative conditions in a controlled environment. The results obtained by different IR methods in a Guarded Hot Box have been compared with heat flow meter measurements and theoretical values.

Original languageEnglish
Pages (from-to)211-217
Number of pages7
JournalEnergy and Buildings
Publication statusPublished - 15 Jun 2016
Externally publishedYes



  • Experimental measurements
  • Guarded Hot Box
  • Heat flow meter
  • Infrared thermography
  • Thermal transmittance

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanical Engineering
  • Electrical and Electronic Engineering

Cite this