ABSTRACT
Heat pump dryers have been known to be energy efcient when used in conjunction with drying operations. The principal advantages of heat pump dryers emerge from the ability of the heat pumps to recover energy from the exhaust gas as well as their ability to control the drying gas temperature and humidity. Many researchers have demonstrated the importance of producing a range of precise drying conditions to dry a wide range of products and improve their quality. At the same time, MacArthur (1984) has mentioned the need to optimize component and system design to increase energy efciency in heat pump systems.
