Porous energy storage materials were fabricated from sintered ceramsite and paraffin to reduce high energy consumption in cold/heat pre-treatment for fresh air systems. The samples were processed via vacuum impregnation and subjected to physical property testing. Based on measured parameters

a modular duct installation scheme was designed; filling standards for the packing material were determined using resistance formulas; and seasonal operation control strategies were established. A scaled-down test platform was employed for comparative performance evaluations under various operating conditions. Results demonstrate that the material's phase-change range aligns well with indoor temperature ranges

achieving an annual comprehensive energy savings rate of 22.5%. Energy conservation performance is particularly notable under extreme winter and summer conditions

while bypass mechanisms effectively mitigate unnecessary material consumption during spring and autumn periods. This study provides practical guidance for low-carbon retrofitting of existing fresh air systems.