Effects of Drying with Heat Pump, Heater and Heat Pump in Combination with Heater on Quality of Kaffir Lime Leaves and Energy Consumption
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Abstract
The objectives of this research were to study the effects of drying kaffir lime leaves using heat pump, heater and heat pump in combination with heater at temperatures of 45, 55 and 65°C on physical and chemical properties of kaffir lime leaves and specific energy consumption. The results showed that the drying rate increased with an increase of drying temperature. When considering among three drying systems at the same drying temperature, it was also observed that an average drying rate of heat pump-heater drying exhibited the highest value resulting in shorter drying time than heat pump and heater system. For the result of color of kaffir lime leaves after drying, it was found that dried kaffir lime leaves with heater and heat pump in combination with heater system at 45 and 55°C provided the best color value. Moreover, the results of the antioxidant content and activity showed that dried kaffir lime leaves with heater and heat pump in combination with heater system at 55°C contained the highest content of beta-carotene and phenolic compounds and antioxidant activity. However, the result of energy usage revealed that heater had the highest specific energy consumption. Therefore, overall results indicated that drying with heat pump in combination with heater system at 55°C for 330 min led to dried kaffir lime leaves with the best of physical and chemical properties and the lowest energy consumption.
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ลิขสิทธ์ ของมหาวิทยาลัยเทคโนโลยีราชมงคลพระนครReferences
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