Heat Power Laboratory, Department of Mechanical Engineering, National Institute of Technology, Rourkela, 769008, India.
Environ Sci Pollut Res Int. 2023 May;30(25):67351-67367. doi: 10.1007/s11356-023-27085-z. Epub 2023 Apr 27.
In the present work, experimental studies of drying Krishna tulsi leaves in an in-house fabricated evacuated tube solar collector (ETSC) connected with an indirect solar dryer are carried out. The acquired findings are compared to those obtained from drying the leaves in open sun drying (OSD). The developed dryer takes 8 h to dry Krishna tulsi leaves; it takes 22 h in the OSD to reach a final moisture content of 12% (db) from an initial moisture content of 47.26% (db). The collector and dryer efficiencies range from 42 to 75%, 0-18%, respectively, with an average solar radiation of 720 ± 20 W/m. The ETSC and drying chamber exergy inflow and outflow vary from 200 to 1400 W, 0 to 60 W, and from 0 to 50 W, 0 to 14 W, respectively. The ETSC and cabinet exergetic efficiencies range from 0.6-4% and 2-85%, respectively. The exergetic loss of the overall drying process is estimated to be 0-40%. The drying system sustainability indices, including improvement potential (IP), sustainability index (SI), and waste exergy ratio (WER), are calculated and presented. The value of the embodied energy of the fabricated dryer is 349.874 kWh. For an expected life span of 20 years, the dryer will reduce CO by 13.2 tonnes and earn carbon credits worth between 10,894 and 43,576 INR. The proposed dryer has a payback period of 0.4 years.
在本工作中，我们在内部制造的真空管太阳能集热器（ETSC）中进行了实验研究，并将其与间接太阳能干燥器连接，以干燥 Krishna 图尔西叶。将获得的结果与在露天干燥（OSD）中干燥叶片的结果进行了比较。所开发的干燥器需要 8 小时才能干燥 Krishna 图尔西叶；在 OSD 中，需要 22 小时才能从初始水分含量 47.26%（db）达到最终水分含量 12%（db）。集热器和干燥器的效率分别为 42%至 75%和 0%至 18%，平均太阳辐射为 720±20 W/m。ETSC 和干燥室的火用流入和流出分别为 200 至 1400 W，0 至 60 W，0 至 50 W，0 至 14 W。ETSC 和机柜的火用效率分别为 0.6%至 4%和 2%至 85%。整个干燥过程的火用损失估计在 0%至 40%之间。计算并提出了干燥系统的可持续性指数，包括改进潜力（IP）、可持续性指数（SI）和废火用比（WER）。所制造的干燥器的体现能量值为 349.874 kWh。预计使用寿命为 20 年，干燥器将减少 13.2 吨 CO，并获得价值在 10894 至 43576 印度卢比之间的碳信用额。该干燥器的投资回收期为 0.4 年。
