![]() Other in-situ approaches, such as infrared (IR) thermography and calculation methods, have also been developed to evaluate thermal transmittance and thermal resistance. The hot box method is commonly used in a lab environment, while the heat flow method has been recommended in the BS ISO 9869 for in-situ measurements. Measurements can be done in a laboratory (ex-situ) or on-site (in-situ). ![]() The thermal performance of building materials can be characterized using thermal transmittance (U-value), thermal resistance, thermal conductivity, and diffusivity. ![]() It directly relates to the thermal comfort of the building occupants, as well as the energy consumed for heating or cooling. It describes how building materials respond to the ambient environment in the daily or seasonal cycle. ![]() The thermal performance of building materials is an important factor that greatly affects a building’s energy performance and efficiency, i.e., it is used for the energy auditing of new and existing buildings. ![]()
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