Sophie Wang, PhD, University of Illinois Urbana-Champaign Frost accumulation on heat-transfer surfaces poses serious challenges for air-source heat-pump systems. The low-thermal-conductivity frost layer reduces heat transfer and blocks air flow, increasing air-side fan power requirements. For most heat-pump systems, a routine reverse-cycle defrosting operation is used, which not only adds power consumption but also interrupts the heat supply and undermines indoor thermal comfort. In this talk, I will present solutions from two different angles: (1) Delaying or slowing frost formation via surf…
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