Dynamic modelling of indoor air humidity

This paper describes a computer simulation program being developed at the Hong Kong Polytechnic for dynamic modelling of heat and moisture transport in buildings. At present, the program can simulate simultaneous heat and moisture transfer in the walls and slabs of a room and its effect on the room temperature and humidity. Effects of outdoor weather and air?conditioning are simultaneously simulated. Presented in this paper include: discussions on why indoor humidity modelling is needed; a review of relevant works reported in various literatures; descriptions of the models incorporated into the program; and simulation results obtained by using the room and system models that have been developed.