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- Title
In Situ Evaluation of the U-Value of a Window Using the Infrared Method.
- Authors
Park, Seyoung; Kim, Seo Hoon; Jeong, Hakgeun; Do, Sung Lok; Kim, Jonghun; Cabeza, Luisa F.
- 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.
- Subjects
SOUTH Korea; BUILDING-integrated photovoltaic systems; STANDARD deviations; FLOW meters
- Publication
Energies (19961073), 2021, Vol 14, Issue 7, p1904
- ISSN
1996-1073
- Publication type
Article
- DOI
10.3390/en14071904