A review of heat-pump drying (HPD): Part 2 – Applications and performance assessments

In the second part of this study, heat-pump drying systems were comprehensively reviewed in terms of applications and performance evaluations. In this regard, these systems were classified in terms of type of heat pump systems, type of dryer and product types first. The performance assessments included coefficient of performance (COP), specific energy consumption (SEC) and specific moisture extraction rate (SMER), while types of energetic, exergetic and cost analyses were covered. It may be concluded that the most preferred method used to determine the HPD efficiency is SMER, while in recent years exergetic analysis method has been widely used.