Apparatus for Thermal Performance Measurements of Insulated Roof Systems

摘要

The US Department of Energy conducted thermal performance measurements on low-slope roofs with a recently developed field test apparatus at Oak Ridge National Laboratory (ORNL). The apparatus accommodates four 4 ft x 8 ft test specimens and includes the measurement capabilities for specimen temperatures, temperature gradients, heat flows and moisture content. A weather station characterizes outdoor weather conditions. Tests underway include (1) validation of a roof surface temperature model developed to study the effects of wet insulation; (2) measurement of temperature distributions and heat transfer in high R-value roofs; and (3) validation of an analysis of the effectiveness of high reflectance surfaces. Preliminary experimental results are presented and correlations between experiment and modeling are discussed. (ERA citation 10:027848)