A 1-D mathematical model is established for diatomite-based humidity control materials (DBHCM)

to simulate the coupled heat and moisture migration process at different porosities

different ambient temperatures and different ambient relative humidities. The humidity control performance of DBHCM is tested and surfaces of DBHCM are characterized by micrograph. The results show that with the decrease of porosity

the amounts of adsorption and desorption increase

ambient temperature does not significantly influence the coupled heat and moisture migration process

and the effect of ambient temperature (the maximum deviation is 20℃) on the adsorption and desorption of DBHCM is about 10%. Better humidity control performance demands smaller pore diameter and larger quantity of small pores. The experimental results and the predictions of humidity control performance of DBHCM

as well as the micrograph representation of pore structures of DBHCM agree well with each others

which can fully verify the rationality of the mathematical model.