Ecology, Environment and Conservation Paper

Vol 23, Issue 3, 2017; Page No.(1405-1413)

EFFECT OF MICROWAVE AND MICROWAVE-VACUUM DRYING ON DRYING KINETICS OF GERMINATED LENTILS AND ITS ENERGY CONSUMPTION

Robbarts Nongmaithem and Venkatesh Meda

Abstract

The present study examines the effect of microwave and vacuum on drying kinetics of pulsed mode microwave-vacuum drying of germinated lentils. The germinated lentils were dried using pulsed mode microwave-vacuum technique, for 2s, 5s and 8s of 2000W microwave power at 0, 15 and 45 kPa vacuum pressure. Overall, Modified page model II showed highest R2 and lowest RMSE values. The drying rate constant k and effective moisture diffusivity (Deff) increased with increased in microwave power and vacuum pressure level, resulting in reduction of drying time. This reduction in drying time reduces energy consumption from 43.81 kWh in hot air (HA) drying (65°C at 1.5 ms-1) to 0.7016 kWh in microwave vacuum drying (MVD) at 8s and 15 kPa drying. MVD proves to be a promising technique in drying of germinated lentils.

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