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.
Highlights
Background and PurposeThe Korean government has proposed a target for reducing greenhouse gas emissions of 37% and has issued amendments to the energy-saving design standards related to reducing greenhouse gases and strengthening the insulation of building envelopes
It is essential to study the feasibility of measuring thermal performance as there is no U-value in situ measurement method for windows that includes the glass and frame
This study proposed the ISO 9869-2 IR method that could solve the shortcomings of the ISO 9869-1 heat flow meter (HFM) method, which is a method of measuring the thermal performance of building envelope
Summary
The Korean government has proposed a target for reducing greenhouse gas emissions of 37% and has issued amendments to the energy-saving design standards related to reducing greenhouse gases and strengthening the insulation of building envelopes. National efforts have been made in the building sector, such as strengthening insulation standards and expanding certification systems to save energy [1] Many of these efforts are limited to new buildings and are difficult to apply to existing buildings. For domestic buildings, energy-saving design standards are currently being used to regulate the rate of heat transfer in buildings. This is different from the value measured at the site, and errors occur due to aging and heat exchange during construction. The infrared (IR) method is a technique for analyzing the temperature of the surface of a measurement target using a thermal image camera This method is a non-contact, non-destructive evaluation method. The purpose of this study is to measure the U-value of a window using the IR method and compare the obtained results with an existing U-value measurement method
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