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Multi-shelf domestic solar dryer

机译：多功能家用太阳能烘干机

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摘要

The solar dryer described in this paper can be used for drying various products at home under hygienic conditions with the self guarantee of adulteration free product. This solar dryer is of multi-shelf design, consisting of three perforated trays arranged one above the other. The drying air flows through the product by natural circulation. One of its novel features is variable inclination to capture more solar energy in different seasons. Another novel feature is the option to dry product under shade or without shade as per requirement. The rate of drying is uniform in all the trays due to heating of the air by solar energy in between the trays. The maximum stagnation temperature of this solar dryer was found to be 100℃ in the month of November at Ludhiana (31°N). The moisture evaporation on the 1st, 2nd and 3rd drying day for drying fenugreek leaves was 0.23, 0.18 and 0.038 kg/m~2 h. To overcome the problem of reduction in efficiency on the second and third drying day, a semi-continuous mode of loading has been investigated, in which the efficiency remains almost the same on all drying days. The drying rate in the dryer was more than double that in open shade drying. Moreover, the final moisture content of the product was low enough (7.3% wb) for grinding it to a powder form and for good shelf life (1 year). An uncertainty analysis was performed, and the uncertainty in the efficiency was found to be 1.35%. An economic analysis was performed by three methods. The cost of drying fenugreek leaves in the domestic solar dryer turned out to be about 60% of that in an electric dryer. The cumulative present worth of the savings are much higher (18, 316 Rupees) than the capital cost of the dryer (1600 Rupees). The payback period is also very low (< 2 years) as compared to the life of the dryer (20 years), so the dryer will dry product free of cost during almost its entire life period. The quality and shelf life of the dried products are comparable to those of branded products, while the cost is even less than that of the unbranded products.
机译：本文所述的太阳能干燥机可用于在卫生条件下在家中干燥各种产品，并具有无掺假产品的自我保证。该太阳能干燥器采用多层设计，由三个穿孔的托盘组成，每个托盘彼此叠置。干燥空气通过自然循环流过产品。它的新颖特征之一是倾斜度可变，可以在不同季节捕获更多的太阳能。另一个新颖的功能是可以根据需要选择在阴暗或不阴暗的条件下干燥产品。由于托盘之间的太阳能加热空气，所有托盘的干燥速度均一。在11月的卢迪亚纳（31°N），发现该太阳能干燥机的最高停滞温度为100℃。干燥胡芦巴叶的第一，第二和第三干燥天的水分蒸发分别为0.23、0.18和0.038 kg / m〜2 h。为了克服在第二和第三干燥日效率降低的问题，已经研究了半连续装载方式，其中在所有干燥日效率几乎保持相同。干燥机中的干燥速率是开放式干燥中的两倍以上。此外，产品的最终水分含量低（7.3％wb），足以将其研磨成粉末状并具有良好的保存期限（1年）。进行了不确定性分析，发现效率的不确定性为1.35％。通过三种方法进行了经济分析。家用太阳能干燥器中胡芦巴叶的干燥成本原来约为电动干燥器的60％。节省的累计现值比烘干机的资本成本（1600卢比）要高得多（18、316卢比）。与烘干机的寿命（20年）相比，投资回收期也非常短（<2年），因此烘干机将在几乎整个使用寿命内免费烘干产品。干燥产品的质量和保质期与品牌产品相当，而成本甚至低于非品牌产品。

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