Frequency-Domain Approach to Passive Building Energy Analysis

摘要

A new graphical approach to passive building design is presented. The admittances of each of the building elements to the major driving functions (outdoor temperature and solar radiation) are represented in a two-dimensional vector, and the overall dynamic response of the building is obtained by vector addition. The interaction among components is naturally accounted for by a modification of the admittance of the component. Diagrammatic vector addition is emphasized to give the user an idea of the relative size of the dynamic contribution made by each building component. From the results of this addition and from a simple analysis of the weather, we obtain the elevation of the average indoor temperature above the average outdoor temperature, and the amplitude and phase of the diurnal (or any other frequency) fluctuation of the indoor air temperature. The former is a measure of the actual solar gain reaching the indoor air; the latter describe thermal masses in the building and their coupling to the indoor air and solar radiation. It is expected that a simplified procedure can be developed based on a correlation between these parameters and overall building energy performance. (ERA citation 07:053435)