Cause analysis for fan-coil frosting cracking in a fresh air energy recovery system user in northern residence

Analyses the reason for fan-coil cracking in the early heating period when the fresh air supply temperature of ERV system is lower than 0 ℃, and points out that in order to prevent fan-coil frosting cracking caused by the low supply air temperature, reheating fresh air by the hot water coil in residential building heating design should be avoided to adopt.