Abstract

The basic design of most commonly used solar dryers displaying varying fundamental principles of heat and mass transfer were compared with recently commercialized and patented design of Solar Conduction Dryer. Bottle gourd of 100 kg by mass, having an initial moisture content of 80% from which 77.78 kg of water was required to be removed to get the desired moisture content of about 10%, was used as drying load. The performance of various solar dryers were analyzed on the basis of three criteria, namely, the annualized cost, the present worth of annual savings, and the present worth of cumulative savings. The economic analysis shows that the present cumulative worth of annual savings for drying bottle gourd over the dryers lifetime works out to be 42,294, 23,027, 55,451, 58,740, and 37,594 USD for the case of solar tunnel dryer, solar cabinet dryer, solar conduction dryer, corrugated solar conduction dryer and corrugated and electrically backed solar conduction dryer, respectively. The economic parameters of interest, such as the payback period and the internal rate of return of dryers were also estimated. The analysis shows that the corrugated solar conduction dryer (CSCD) gives the best performance as compared to the rest of the solar dryers when compared on the basis of economics and product quality attributes.

摘要

最常用的太阳能干燥器的基本设计展示了不同的传热和传质基本原理，并与最近商业化并获得专利的太阳能传导干燥器设计进行了比较。质量为 100 千克的葫芦，初始水分含量为 80%，需要从中除去 77.78 千克水以获得约 10% 的所需水分含量，用作干燥负载。根据年化成本、年度节约现值和累计节约现值三个标准对各种太阳能烘干机的性能进行了分析。经济分析显示，对于太阳能隧道式烘干机、太阳能柜式烘干机、太阳能传导干燥机，波纹太阳能传导干燥机和波纹和电支持太阳能传导干燥机，分别。还估计了感兴趣的经济参数，例如投资回收期和烘干机的内部收益率。分析表明，在经济和产品质量属性的基础上进行比较时，波纹太阳能传导干燥器 (CSCD) 与其他太阳能干燥器相比具有最佳性能。