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Bhartiya Krishi Anusandhan Patrika
Year : 2017, Volume : 32, Issue : 1
First page : ( 54) Last page : ( 56)
Print ISSN : 0303-3821. Online ISSN : 0976-4631.

Thermal performance of optimum thermal energy storage in natural convective solar crop dryer

Jain Dilip1, Srivastava Soma2

ICAR-Central Arid Zone Research Institute, Jodhpur, 342003

1Central Arid Zone Research Institute, Jodhpur, 342003

2ICAR-Central Arid Zone Research Institute, Jodhpur, 342003

Online published on 13 December, 2017.

Abstract

A solar crop dryer using phase change material as thermal energy storage was developed to naturally regulate the drying and also maintain the quality of dried crop. The solar dryer included flat plate solar collector, packed bed phase change energy storage, drying plenum with crop trays and natural ventilation duct based on phase change material. Dryer was designed such that it had collector area of 1.5 m2, six crop trays with an effective area of 0.50 x 0.75 m2, could hold 12 kg of fresh leaves vegetables and herbs. The dryer was attached with the provision of variable capacity of packed bed thermal energy storage from 0 to 48 kg and 0 to 32 kg phase change material (PCM) below drying chamber and in natural ventilation duct, respectively. The phase change material stored the thermal energy during sunshine hours and released the latent and sensible heat after sunset, thus dryer was effectively operative further for next 5–6 hours. The temperature in drying chamber was observed 6°C higher than the ambient temperature after sunshine hours till the mid night during the month of June and November at Jodhpur.

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