Abstract: In this paper， a coating was obtained through mixing a LiCl-dissolved chitosan solution with a polyvinyl alcohol glue solution （8 wt%）. Then， this coating was coated on the porous polyethylene film to form a heat transfer film. The effect of addition amount of the chitosan solution on the properties of the heat transfer film was investigated. The heat transfer film exhibited a high moisture permeability of 2 600 g/（m2·24 h） at a chitosan solution content of 80 wt%， indicating good water resistance. The heat exchange film was also cut and assembled into a heat exchange core. This heat exchange core showed a net fresh air supply rate of 95 % under an air volume of 100 m3/h as well as an enthalpy efficiency of 77.8 % under the heating condition. This suggests good energy-saving effect. A new fan with the heat exchange core was evaluated through a three-month operation. Compared to the data obtained before the new fan， there was no attenuation in the performance after the three-month operation.

Key words: heat exchange filmmoisture, permeability, chitosan, heat exchange core