In Situ Evaluation of the U-Value of a Window Using the Infrared Method
Open Access
Abstract
The amount of heat lost through the envelope of a building is one of the most important variables that affects the energy performance evaluation of a house. In addition, it is especially important to estimate and accurately diagnose the amount of heat produced by windows. In Korea, windows’ U-values reflect a building’s initial design values and thermal characteristics that determine the thermal performance of an existing building, and is a factor that can overestimate the energy performance of a building. Therefore, there is a need for a field measurement method that can accurately measure the total U-value of windows in an existing house. This study provides a method of quantitatively measuring the total U-value of windows using the infrared (IR) method in ISO 9869-2. As a result of measuring the U-value using the infrared (IR) method, the Korean Standard (KS F 2278) for window performance test result values and the root mean square error (cvRMSE) for the U-value measurements using the IR method showed a high accuracy of about 3.29%. In addition, we confirmed that the IR method is an effective (cvRMSE about 7% improvement) method that can measure the comparison result faster than the heat flow meter (HFM) method, which is a conventional thermal performance measurement method.Keywords
This publication has 20 references indexed in Scilit:
- Reliability Field Test of the Air–Surface Temperature Ratio Method for In Situ Measurement of U-ValuesEnergies, 2018
- Assessing the thermal performance of insulating glass units with infrared thermography: Potential and limitationsEnergy and Buildings, 2017
- A comparison of standardized calculation methods for in situ measurements of façades U-valueEnergy and Buildings, 2016
- U-value in situ measurement for energy diagnosis of existing buildingsEnergy and Buildings, 2015
- Infrared Screening of Residential Buildings for Energy Audit Purposes: Results of a Field TestEnergies, 2013
- A quantitative methodology to evaluate thermal bridges in buildingsApplied Energy, 2012
- Effect of different parameters on the in situ thermal conductance evaluationEnergy and Buildings, 2011
- Infrared thermovision technique for the assessment of thermal transmittance value of opaque building elements on siteEnergy and Buildings, 2010
- A method for the experimental evaluation in situ of the wall conductanceEnergy and Buildings, 2006
- A simple method to determine the specific heat capacity of thermal insulations used in building constructionEnergy and Buildings, 2003