Wall parameters by time domain methods: Part 1—Response factors

The sequences of wall response factors permit calculation of the wall response to hourly meteorological data over a long period. It is shown here that they can be computed using time-domain methods, through superposition of the response to a steadily maintained rise in temperature, together with a transient solution. As applied to multi-layer walls, this process entails the use of layer transmission matrices for both steady-progressive and transient excitation, multiplication of which enables the overall wall properties to be found. The matching of the solutions follows from the result that the energy distributions throughout the wall for any two transient eigenfunction temperature distributions are independent of each other. An example is given.