Abstract

Solar drying is one of the most beneficial and sustainable technologies benevolent to our society. In this paper, comprehensive review of various designs of natural convective and direct type (NCDT) of solar dryers has been brought forward for the simple reason of collating the desired and the most intriguing state of the art of practicing of solar drying technology for the benefit of one and all. Further, the comparison of performance of existing dryers was attempted based on parameters such as design simplicity, capital cost, compactness, portability, thermal performance, and other equally important parameters contributing to the dried product quality attributes. The dryers utilize convection and radiation as a major heat transfer mechanism. Solar dryer based on the conduction mechanism appears to be more efficient and cost-effective. In our opinion, inclusion of the conduction mechanism amongst the prevalent solar dryers will only lead to further consolidation of solar drying technology. The work done by the authors on their innovative solar conduction dryer is also highlighted and its performance compared with the rest of the reported designs of NCDT dryers.

摘要

太阳能干燥是对我们的社会有益的最有益和可持续的技术之一。在本文中，对自然对流和直接型 (NCDT) 太阳能干燥器的各种设计进行了全面审查，原因很简单，即整理了太阳能干燥技术实践中所需的和最有趣的技术状态，以期受益。一个和所有。此外，根据设计简单性、资本成本、紧凑性、便携性、热性能和其他对干燥产品质量属性有贡献的同等重要参数等参数，尝试对现有干燥机的性能进行比较。干燥机利用对流和辐射作为主要的传热机制。基于传导机制的太阳能干燥器似乎更高效、更具成本效益。在我们看来，在流行的太阳能干燥器中加入传导机制只会导致太阳能干燥技术的进一步整合。作者在他们创新的太阳能传导干燥器上所做的工作也得到了强调，并将其性能与其他报告的 NCDT 干燥器设计进行了比较。