Fourier-Transform Approach to Building Simulations with Thermostatic Controls

摘要

Analyzing the thermal behavior of a linear system, such as a building (with some commonly made approximations), is greatly simplified in the frequency domain because of the decoupling of different frequencies. Thermostatic controls, an important part of building systems, invalidate this decoupling since they respond only to the temperature at a particular time (i.e., the sum of all frequencies). Nevertheless it is shown here that by suitably formulating the problem, buildings with thermostatic controls can be simulated in the frequency domain, even when the setpoint is a function of time. Thus an hour-by-hour profile of indoor temperature and auxiliary energy requirements can be obtained without doing an hour-by-hour simulation. (ERA citation 08:020938)