Abstract

Open sun drying has been used for many years for grain drying. Unfortunately, in open sun drying, solar energy is improperly utilized, and it takes a longer time to dry, leading to a compromise in product quality. Also, it requires larger floor space, continuous observation for drying, and suffers from quality impairments. In this work, a compact solar grain dryer design is being proposed and optimized for higher energy efficiency. Different designs were tested using CFD simulations for their performance. To make this grain dryer energy efficient, part of the hot air was recirculated, and simulations were performed to optimize the sizing and location of the solar fan. Several other parameters that determine the overall performance was considered, such as air flow rate, temperature, and pressure. An orifice was introduced at the inlet of the pipe to increase the quantity of recycled air. The effect of the diameter of the orifice was studied, and its optimum was determined. Finally, two dryer designs were proposed, one without fins and the other with fins.

摘要

露天干燥已经用于谷物干燥多年。不幸的是，在敞开的阳光下干燥中，太阳能利用不当，并且干燥时间较长，导致产品质量下降。另外，它需要较大的地板空间，需要连续观察干燥情况，并且会降低质量。在这项工作中，正在提出紧凑型太阳能谷物干燥机设计，并对其进行了优化，以提高能源效率。使用CFD仿真测试了不同的设计的性能。为了使这种谷物干燥机高效节能，一部分热空气被再循环，并进行了仿真以优化太阳能风扇的尺寸和位置。考虑了确定总体性能的其他几个参数，例如空气流速，温度和压力。在管道的入口处引入孔口以增加再循环空气的量。研究了孔直径的影响，并确定了其最佳值。最后，两个烘干机设计建议使用s，一个不带鳍，另一个带鳍。