Performance comparison of Closed Loop Heat Pump Dryer with Bed, Tray and Bed-Tray Dryer for Curry Leaves
Abstract
Heat pump assisted drying provides a regulated drying environment by controlling the temperature and humidity of air through which the product quality can be improved with less energy consumption. It has incredible potential for the future, as well as the opportunity for a revolution in drying techniques. An expansion valve, evaporator, condenser, and compressor make up the heat pump system, in connection with the copper tube of each component. In this project, the heat pump dryer was designed and fabricated where R134a is used as the working fluid to dry the Indian spice Murraya koenigii (curry leaves). Murraya koenigii has many bioactive principles as a result of which it is a medicinally valuable herb. The curry leaves are dried in a closed-loop heat pump dryer under three different methods namely, Bed drying, tray drying, and compound drying which is a combination of both bed and tray drying at three different velocities 1.5 m/s, 2 m/s and 2.5 m/s. The drying characteristics of the closed loop heat pump dryer is analysed with different combination of drying methods and velocities for curry leaves.
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