Thermal Resistance of Outside Insulated Concrete Wall According to Internal and External Surface Heat Flow

실내·외 표면 열류에 따라 산출된 외단열 콘크리트 외벽체의 열저항 비교 분석

Many studies have been conducted to accurately diagnose the thermal performance of building opaque exterior walls. Thermal resistance(R-value) is a representative indicator of the thermal performance of opaque exterior walls. Methods of calculating thermal performance are mainly ISO 6946 and ISO 9869-1. Thermal resistances calculated using the two methodologies sometimes show differences. To reduce this difference, many studies are being conducted to perform in-situ measurements more accurately. ISO 9869-1 measures use a heat flowmeter sensor and a temperature sensor. In particular, it is recommended that the heat flowmeter sensor be attached to a surface on a stable temperature environment side. so, that the heat flowmeter sensor is attached to an internal surface that would not be affected by snow, rain, or solar radiation. However, it has been reported that a large deviation from the theoretical value when using the internal surface heat flow in an outside insulated wall. In this study, an internal surface heat flowmeter sensor is attached, and an external surface heat flowmeter sensor is also attached. And the purpose is to compare and analyze the thermal resistance calculated using the two heat flows. As a result, if the internal and external temperature difference is sufficiently large, using external surface heat flow would be closer to the theoretical value in the outdoor insulated wall. However, as the internal and external temperature difference becomes smaller, the accuracy decreases slightly even when using the outdoor surface heat flow.