Journal
JOURNAL OF ENERGY STORAGE
Volume 39, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2021.102623
Keywords
Indirect solar dryer; Shell and tube storage unit; CNTs-paraffin wax; Poria Cocos drying
Categories
Funding
- ministry of agriculture andrural affairs of the P.R. China [20150313511]
- Chinese Scholarships Council Foundation [2016818T67]
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Solar dryers are crucial in reducing energy consumption for drying in small farms. A developed solar dryer was tested for drying Poria Cocos, with the solar air heater and storage unit showing good thermal and exergy efficiency. The system payback period is 1.55 years.
Solar dryers play a pivotal role in minimizing drying energy consumption in small farms. Therefore, its development is an urgent need. In this study, a developed solar dryer comprised of a smooth solar air heater, shell and tube storage unit, and drying chamber, has been constructed and tested to dry a Chinese medicinal fungus (Poria Cocos). The dryer has been operated under two airflow rates and then, energy and exergy analysis applied to the system. The results show that: solar air heater averaged thermal and exergy efficiency were 66.2% and 4.6%, 70.2 and 4.4% for 1st and 2nd experiments, respectively. Carbon nanotubes-paraffin wax shell and tube storage unit averaged overall thermal efficiency was 12.2% and 19.6% leading to 8.1% and 11.9% as averaged overall exergy efficiency for 1st and 2nd experiments, respectively. The specific energy consumption (SEC) was 6.545 and 7.917 kWh / kg moisture, also, the dryer's overall thermal efficiency was 36.4 and 30%, for 1st and 2nd experiments, respectively. The final moisture content of Poria Cocos was in the range of 6.6-8% w.b. The system payback period is 1.55 years.
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