Thermal performance of drying mango slices using a baffled-type hybrid solar dryer with exhaust hot air recirculation

Year 2025, Volume: 11 Issue: 5, 1483 - 1496, 21.10.2025

Debashree Debadatta Behera , Shiv Sankar Das Ramesh Chandra Mohanty , Raj Kumar Satankar

Abstract

In this research, a hybrid solar dryer has been designed for day and night operation through forced convection for drying mango slices and preparation of bread toast. As studied from the literature, enough research is not done on the use of recirculation of exhaust hot air and baffle in a solar dryer. The thermal and economic performance of the dryer has been assessed by calculating collector efficiency, drying efficiency, drying rate, payback period and cost-benefit ratio. It is found that the maximum collector efficiency is 74.1% and 66.96% with and without the use of exhaust hot air recirculation. Performance parameters such as drying rate (0.95 kg/hr), drying efficiency (32.89%), payback period (1.4394 years), and cost-benefit ratio (2.08) have been evaluated. An effective drying effect is produced by using an electric coil for night operation of dryer. An increase in the solar radiation increases the temperature of air inside the collector, thereby increasing the collector efficiency, drying efficiency and drying rate. The coefficient of determination for outlet collector temperature during consecutive three days is estimated above 95%, thus signifying a higher order of fit. Performing an uncertainty analysis of measurement, the uncertainty error is calculated below 10% exhibiting a reliable experimental result. Solar drying is considered as a sustainable food preservation method without negatively impacting the environment and finds wide applications in the fruit and food processing industries, domestic purposes etc.

Keywords

Solar Drying , Forced Convection , Development of Hybrid Solar Dryer , Experimental Investigation , Performance Analysis , Uncertainty Analysis

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