Non Intrusive U Value Metering


The significance of U values in buildings’ shell energy performance is well known in the scientific community as well as in the construction sector. In addition, conducting a validation of the energy performance of a building often requires the knowledge of real U value figures, since their theoretical peers may deviate considerably from the real ones. The theoretical U value of a shell element may be calculated using complex material and surface related information, while its practical validation is conducted usually by equipment that requires tedious installation and constant contact with the examined element. Aim of this paper is to introduce an easily deployed, plug and play, contact less technology, able to provide a reasonable approximation of the building element U value and its variation with external air speed as well as an accurate estimation of the U value change in case of a shell (wall or window) retrofit.

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Sakkas, N. , Valls, J. , Daskalakis, C. and Kaltsis, E. (2015) Non Intrusive U Value Metering. Open Journal of Energy Efficiency, 4, 28-35. doi: 10.4236/ojee.2015.42003.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] IEA (International Energy Agency) (2008) Worldwide Trends in Energy Used and Efficiency—Key Insights from IEA Indicator Analysis. IEA Publications, Paris.
[2] Doran, S. (2003) Improving the Thermal Performance of Buildings in Practice. BRE Project Report 16476. Subsequently Published as BRE Client Report 222392-2005. Watford, BRE.
[3] Doran, S. (2008) Thermal Transmittance of Walls of Dwellings before and after Application of Cavity Wall Insulation. Prepared for: James Russill, Energy Saving Trust. BRE Report Number 222077.
[4] Baker, P. (2011) Technical Paper 10—U-Values and Traditional Buildings. Historic Scotland, Edinburgh.
[5] Rye, C. and Scott, C. (2010) The SPAB Research Report 1: The U-Value Report. Revised 2011. The Society for the Protection of Ancient Buildings, London.
[6] Ward, T. (1993) In Situ Measurements of the U-Value of Walls of Several Different Constructions. Building Research Establishment Note. No 66/93.
[7] Hulme, J. and Doran, S. (2014) In-Situ Measurements of Wall U-Values in English Housing. Prepared for: Alex Boss, DECC. BRE Output Number 290-102.
[8] Ortega, R., Loria, A. and Kelly, R. (1995) BS EN ISO 6946 Building Components and Building Elements—Thermal Resistance and Thermal Transmittance—Calculation Method.
[9] Xeni, F., Eleftheriou, P., Michaelides, I., Hadjiyiannis, S., Philimis, P. and Stylianou, A. (2014) In Situ U-Value Measurements for Today’s Cypriot Houses. International Journal of Sustainable Energy.

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