Comparison of calculation methods for heat gain by heat transfer of building envelopes

Compares the periodic response factor method and the transfer function method. Compared with the transfer function factor method, the periodic response factor method simplifies the calculation procedure, and the periodic response factor can reflect thermal response of building envelopes to a periodic pulse and be taken as thermal stability indicator of building envelopes. Deduces the relation expression between the transfer function factor and the periodic response factor, by which a data base of the periodic response factor for typical building envelopes based on the existed data base RP-626 of ASHRAE can be built so as to simplify calculation by the periodic response factor method.