Energy Performance R-Value: Part 1 - Development of integrated evaluation methodology for building enclosures
2008 (English)Conference paper (Refereed)
As a result of global increase in environmental awareness and the strive for reduction in energy consumption, it is only natural to look towards buildings as areas that need significant improvement to meet the society demand on reducing the energy use. After all, buildings consume more energy than cars. Yet the procedures that are used to define the thermal performance of, for example a wall, are typically based on the test performed on dry materials, without consideration of air and moisture movements. With other words these tests represent arbitrary rating conditions because we know that energy performance of materials and building assemblies is affected by moisture and air flows.
This paper, in part 1, explains why the traditional testing with calibrated boxes is limited to comparative measurements of heat flow and proposes testing procedure that through a series of steps bridges the gap between the currently used R-value and energy performance rating. In the second part of the paper, an integrated testing and modeling methodology is applied to interacting effects of heat, air and moisture flows.
In this way, these two papers report a key part of a project sponsored by an industrial consortium that was aiming in the development of performance indicator that closer reflects the thermal performance of an assembly under service conditions. In doing so, the current R-value serves as a baseline to which Rvalues measured in later steps are compared. These steps include R-value measured under two levels of air infiltration and wetting by infiltration of warm, moist air followed by a subsequent drying.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-66103OAI: oai:DiVA.org:kth-66103DiVA: diva2:483732
BEST 1: Building for Energy Efficiency and Durability at the Crossroads. Minneapolis, Building Enclosure Council BEC-Minnesota. June 10-12, 2008
QC 201205092012-01-252012-01-252012-05-09Bibliographically approved