Abstract
The traditional thermal response factor method for load calculation employs invariable time-step. To ensure accuracy with the less possible computing quantity, the method with variable time steps is expected to deal with the complicated dynamic thermal loads of buildings. In this paper, the traditional method of excitation disintegration is analyzed first because the time step is initially fixed here. Two new functions for excitation disintegration are presented, namely the step function and the ramp-step function. Based on the new excitation method, a novel thermal response factor method with variable time steps is developed. In an example, the thermal response to a sine-wave input is evaluated by the traditional and present methods. It illustrates that about 36% computing quantity is decreased with the new method at the same precision.
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