In Situ Evaluation of the U-Value of a Window Using the Infrared Method

Seyoung Park, Seo Hoon Kim, Hakgeun Jeong, Sung Lok Do and Jonghun Kim
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Seyoung Park: Energy ICT Convergence Laboratory, Korea Institute of Energy Research, Daejeon 34101, Korea
Seo Hoon Kim: Energy ICT Convergence Laboratory, Korea Institute of Energy Research, Daejeon 34101, Korea
Hakgeun Jeong: Energy ICT Convergence Laboratory, Korea Institute of Energy Research, Daejeon 34101, Korea
Sung Lok Do: Department of Building and Plant Engineering, Hanbat National University, Daejeon 34158, Korea
Jonghun Kim: Energy ICT Convergence Laboratory, Korea Institute of Energy Research, Daejeon 34101, Korea

Energies, 2021, vol. 14, issue 7, 1-14

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: energy remodeling of existing houses; window; U-value; ISO 9869-1: HFM (heat flow meter); ISO 9869-2: IR (infrared method); in situ (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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