{"title":"Assessing Overall Thermal Conductance Value of Low-Rise Residential Home Exterior Above-Grade Walls Using Infrared Thermography Methods","authors":"Matthew D. Baffa","volume":138,"journal":"International Journal of Civil and Environmental Engineering","pagesStart":626,"pagesEnd":637,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10009118","abstract":"
Infrared thermography is a non-destructive test method used to estimate surface temperatures based on the amount of electromagnetic energy radiated by building envelope components. These surface temperatures are indicators of various qualitative building envelope deficiencies such as locations and extent of heat loss, thermal bridging, damaged or missing thermal insulation, air leakage, and moisture presence in roof, floor, and wall assemblies. Although infrared thermography is commonly used for qualitative deficiency detection in buildings, this study assesses its use as a quantitative method to estimate the overall thermal conductance value (U-value) of the exterior above-grade walls of a study home. The overall U-value of exterior above-grade walls in a home provides useful insight into the energy consumption and thermal comfort of a home. Three methodologies from the literature were employed to estimate the overall U-value by equating conductive heat loss through the exterior above-grade walls to the sum of convective and radiant heat losses of the walls. Outdoor infrared thermography field measurements of the exterior above-grade wall surface and reflective temperatures and emissivity values for various components of the exterior above-grade wall assemblies were carried out during winter months at the study home using a basic thermal imager device. The overall U-values estimated from each methodology from the literature using the recorded field measurements were compared to the nominal exterior above-grade wall overall U-value calculated from materials and dimensions detailed in architectural drawings of the study home. The nominal overall U-value was validated through calendarization and weather normalization of utility bills for the study home as well as various estimated heat loss quantities from a HOT2000 computer model of the study home and other methods. Under ideal environmental conditions, the estimated overall U-values deviated from the nominal overall U-value between ±2% to ±33%. This study suggests infrared thermography can estimate the overall U-value of exterior above-grade walls in low-rise residential homes with a fair amount of accuracy.<\/p>\r\n","references":"[1]\tD. J. Titman, \u201cApplications of thermography in non-destructive testing of structures,\u201d NDT & E International, vol. 34, no. 2, pp. 149\u2013154, Mar. 2001.\r\n[2]\tN. P. Avdelidis, and A. Moropoulou, \u201cEmissivity considerations in building thermography,\u201d Energy and Buildings, vol. 35, no. 7, pp. 663\u2013667, Aug. 2003.\r\n[3]\tP. A. Fokaides, and S. A. Kalogirou, \u201cApplication of infrared thermography for the determination of the overall heat transfer coefficient (U-Value) in building envelopes,\u201d Applied Energy, vol. 88, no. 12, pp. 4358\u20134365, Dec. 2011.\r\n[4]\tC. A. Balaras, and A. A. Argiriou, \u201cInfrared thermography for building diagnostics,\u201d Energy and Buildings, vol. 34, no. 2, pp. 171-183, Feb. 2002.\r\n[5]\tA. Moropoulou, M. Koui, N. P. Avdelidis, E. T. Delegou, and S. Kouris, \u201cCalculating the emissivity of building materials for infrared thermographic applications,\u201d in Proceedings of the 6th International Conference of the Slovenian Society of NDT, 2001, pp. 333\u2013337.\r\n[6]\tR. A. Thomas, The thermography monitoring handbook. Oxford: Coxmoor Publishing, 1999.\r\n[7]\tA. Kylili, P. A. Fokaides, P. Christou, and S. A. Kalogirou, \u201cInfrared thermography (IRT) applications for building diagnostics: A review,\u201d Applied Energy, vol. 134, pp. 531\u2013549, Dec. 2014.\r\n[8]\tS. Datcu, L. Ibos, Y. Candau, and S. Matte\u00ef, \u201cImprovement of building wall surface temperature measurements by infrared thermography,\u201d Infrared Physics & Technology, vol. 46, no. 6, pp. 451\u2013467, Aug. 2005.\r\n[9]\tE. Barreira, and V. P. de Freitas, \u201cEvaluation of building materials using infrared thermography,\u201d Construction and Building Materials, vol. 21, no. 1, pp. 218\u2013224, Jan. 2007.\r\n[10]\tJ. M. Hart, A practical guide to infra-red thermography for building surveys. Watford: Building Research Establishment, 1991.\r\n[11]\t\tR. Albatici, A. M. Tonelli, and M. Chiogna, \u201cA comprehensive experimental approach for the validation of quantitative infrared thermography in the evaluation of building thermal transmittance,\u201d Applied Energy, vol. 141, pp. 218\u2013228, Mar. 2015.\r\n[12]\tB. Tejedor, M. Casals, M. Gangolells, and X. Roca, \u201cQuantitative internal infrared thermography for determining in-situ thermal behaviour of fa\u00e7ades,\u201d Energy and Buildings, vol. 151, pp. 187\u2013197, Jun. 2017.\r\n[13]\tB. Lehmann, K. Ghazi Wakili, T. Frank, B. Vera Collado, and C. Tanner, \u201cEffects of individual climatic parameters on the infrared thermography of buildings,\u201d Applied Energy, vol. 110, pp. 29-43, Oct. 2013.\r\n[14]\tA. Marshall, J. Francou, R. Fitton, W. Swan, J. Owen, and M. Benjaber, \u201cVariations in the U-Value Measurement of a Whole Dwelling Using Infrared Thermography under Controlled Conditions,\u201d Buildings, vol. 8, no. 3, pp. 46, Mar. 2018.\r\n[15]\tR. Albatici, and A. M. Tonelli, \u201cInfrared thermovision technique for the assessment of thermal transmittance value of opaque building elements on site,\u201d Energy and Buildings, vol. 42, no. 11, pp. 2177\u20132183, Nov. 2010.\r\n[16]\tE. Grinzato, V. Vavilov, and T. Kauppinen, \u201cQuantitative infrared thermography in buildings,\u201d Energy and Buildings, vol. 29, no. 1, pp. 1\u20139, Dec. 1998.\r\n[17]\tISO 9869 Thermal insulation - Building elements - In-Situ Measurement of Thermal Resistance and Thermal Transmittance. Part 1: Heat Flow Meter Method, 2014.\r\n[18]\tM. O\u2019Grady, A. A. Lechowska, and A. M. Harte, \u201cInfrared thermography technique as an in-situ method of assessing heat loss through thermal bridging,\u201d Energy and Buildings, vol. 135, pp. 20\u201332, Nov. 2016.\r\n[19]\tEN ISO 6946 Building components and building elements \u2013 thermal resistance and thermal transmittance \u2013 Calculation method, 2007.\r\n[20]\tS. Doran, Field investigations of the thermal performance of construction elements as built. BRE Client Report No. 78132. A DETR Framework Project Report. East Kilbride: Building Research Establishment (BRE), 2001.\r\n[21]\tL. Evangelisti, C. Guattari, P. Gori, and R. D. L. Vollaro, \u201cIn situ thermal transmittance measurements for investigating differences between wall models and actual building performance,\u201d Sustainability, vol. 7, no. 8, pp. 10388\u201310398, Aug. 2015.\r\n[22]\tUNI 10351 Building Materials. Thermal Conductivities and Vapor Permeabilities, 1994.\r\n[23]\tE. Lucchi, \u201cApplications of the infrared thermography in the energy audit of buildings: A review,\u201d Renewable and Sustainable Energy Reviews, vol. 82, no. 3, pp. 3077\u20133090, Feb. 2018.\r\n[24]\tM. V. Jokl, \u201cThermal comfort and optimum humidity Part 1,\u201d Acta Polytechnica, vol. 42, no. 1, 2002.\r\n[25]\tASHRAE Standard 55 Thermal Environmental Conditions for Human Occupancy, 2017.\r\n[26]\tStatistics Canada, Report on Energy Supply and Demand in Canada 1990\u20132015. Ottawa: Statistics Canada, 2017\r\n[27]\tGovernment of Ontario, Ontario\u2019s Five Year Climate Change Action Plan 2016 - 2020. Government of Ontario, 2016.\r\n[28]\tCanadian Mortgage and Housing Corporation, Housing Market Outlook - Canada Edition. Canadian Mortgage and Housing Corporation, 2017.\r\n[29]\tT. A. Reddy, J. F. Kreider, P. S. Curtiss, and A. Rabl, Heating and Cooling of Buildings: Design for Efficiency, Revised Second Edition. Boca Raton: CRC Press, 2009.\r\n[30]\tASHRAE, 2009 ASHRAE Handbook - Fundamentals (Har\/Cdr edition). Atlanta: ASHRAE, 2009.\r\n[31]\tEnvironment Canada. 2016. Temperature \u2013 Monthly data for Vaughan. Retrieved March 11, 2016, from https:\/\/vaughan.weatherstats.ca\/charts\/temperature-monthly.html.\r\n[32]\tDIN EN ISO 9001. Quality management systems \u2014 Requirements, 2008.\r\n[33]\tR. P. Madding, \u201cEmissivity measurement and temperature correction accuracy considerations,\u201d in Thermosense XXI, Orlando, 1999, pp. 393-402.\r\n[34]\tR. Albatici, F. Passerini, A. M. Tonelli, and S. Gialanella, \u201cAssessment of the thermal emissivity value of building materials using an infrared thermovision technique emissometer,\u201d Energy and Buildings, vol. 66, pp. 33\u201340, Nov. 2013.\r\n[35]\tR. -H. Zhang, et al., \u201cStudy of emissivity scaling and relativity of homogeneity of surface temperature,\u201d International Journal of Remote Sensing, vol. 25, no. 1, pp. 245\u2013259, Jan. 2004.\r\n[36]\tASTM E1862 Standard test methods for measuring and compensating for reflected temperature using infrared imaging radiometers, 2002.\r\n[37]\tG. Dall\u2019O, L. Sarto, and A. Panza, \u201cInfrared screening of residential buildings for energy audit purposes: results of a field test,\u201d Energies, vol. 6, no. 8, pp. 3859\u20133878, Jul. 2013.\r\n[38]\tI. Valovirta, and J. Vinha, \u201cWater vapor permeability and thermal conductivity as a function of temperature and relative humidity,\u201d Performance of exterior envelopes of whole buildings IX, 2004.\r\n[39]\tN. B. Hutcheon, and G. O. P. Handegord, Building science for a cold climate (First Edition). Toronto: John Wiley & Sons, 1984.\r\n[40]\tS. Lorente, \u201cHeat losses through building walls with closed, open and deformable cavities,\u201d International Journal of Energy Research, vol. 26, no. 7, pp. 611\u2013632, Jun. 2002.\r\n[41]\tJ. Xam\u00e1n, G. \u00c1lvarez, L. Lira, and C. Estrada, \u201cNumerical study of heat transfer by laminar and turbulent natural convection in tall cavities of fa\u00e7ade elements,\u201d Energy and Buildings, vol. 37, no. 7, pp. 787\u2013794, Jul. 2005.\r\n[42]\tA. Colantonio, \u201cIdentification of convective heat loss on exterior cavity wall assemblies,\u201d in Thermosense XXI, Orlando, 1999, pp. 514\u2013520.\r\n[43]\tB. Kersten, and J. van Schijndel, \u201cModeling the Heat Exchange in Cavities of Building Constructions Using COMSOL Multiphysics\u00ae\u201d, n.d.\r\n[44]\tS. -Y. Wu, L. Xiao, Y. Cao, and Y.-R. Li, \u201cConvection heat loss from cavity receiver in parabolic dish solar thermal power system: A review,\u201d Solar Energy, vol. 84, no. 8, pp. 1342\u20131355, Aug. 2010.\r\n[45]\tD. Haltrect, and K. Fraser, \u201cValidation of HOT2000TM Using HERS BESTEST\u201d, in Proc. Building Simulation, Prague, 1997, pp. 1-8.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 138, 2018"}