Measurement and Analysis of in Situ Dynamic Thermal Performance of Building Envelopes Using Heat-Flowmeter Arrays

摘要

A method is described for determining dynamic thermal performance of building envelopes in situ. The method is passive in the sense that only heat flux and temperature measurements are made - experimental conditions are generated by the natural environment of the wall. Included in the method are procedures for time-averaging of large quantities of data using numerical techniques. This approach makes it possible to collect and analyze digital data rapidly enough to provide essentially a continuous record of performance and, at the same time, store the data in a form convenient for subsequent analysis. Dynamic models are developed, as are methods of correlating them with measured data to determine model parameters representative of dynamic-performance characteristics. Sample data obtained from a typical frame cavity wall were measured and fitted to the models. The relationship between the dynamic-performance characteristics of this wall and traditional steady-state characteristics is discussed. The method described avoids many of the limitations inherent in steady-state experimental measurements. (ERA citation 05:033766)