Assessment of Solar Drying Efficiency for Small-Scale Fruit Preservation

Thesis Abstract

The preservation of fruits through drying remains a critical challenge for small-scale farmers, particularly in rural regions where access to modern drying technologies is limited and post-harvest losses are substantial. This study investigates the efficiency of solar drying systems implemented by small-scale fruit producers, aiming to optimize drying processes to improve product quality, reduce energy consumption, and extend shelf life. The primary objective is to evaluate the technical performance and operational factors influencing solar dryer efficiency, with specific emphasis on temperature, humidity control, drying time, and energy utilization. A mixed-method research design was adopted, combining quantitative experimental measurements with qualitative stakeholder interviews to provide a comprehensive understanding of the drying process. The study targeted a population of 150 small-scale fruit farmers and artisans operating in the Fruitville region. A stratified random sampling technique was employed to select 60 participants based on their utilization of solar drying units, ensuring representation across different farm sizes and technological adaptations. Data collection involved direct observation and measurement of drying parameters using digital data loggers, coupled with structured questionnaires to gather information on operational practices, knowledge levels, and perceived constraints. To assess system performance, the study applied analysis of variance (ANOVA) to compare drying efficiencies across different system configurations, and regression analysis to identify key operational predictors of drying time and quality. Additionally, qualitative thematic analysis was conducted on interview transcripts to explore user perceptions and maintenance challenges. The expected findings indicate significant variability in drying efficiency influenced by system design, environmental conditions, and user competency. It is anticipated that optimized dryer designs, such as improved airflow mechanisms and temperature regulation features, will demonstrate marked improvements in drying rates and energy efficiency. The study expects to identify statistically significant relationships between operational practices and the quality of dried fruits, with regression models explaining a substantial proportion of the variance in drying time and product quality indicators. This research contributes novel empirical evidence on the performance of solar drying technologies in small-scale settings, filling existing gaps in the literature regarding technical efficiencies and user practices. It extends the theoretical framework of Diffusion of Innovations by examining practical adoption and adaptation factors among smallholders, complemented by relevant thermal and fluid dynamics models to elucidate drying mechanisms. The findings are expected to inform policy recommendations for promoting affordable, efficient drying systems, and guide technological interventions to enhance post-harvest management practices. The study concludes that while solar drying systems offer sustainable and cost-effective options for small-scale fruit preservation, their efficiency is contingent upon system design, environmental factors, and user training. It recommends targeted capacity-building initiatives, improved design standards tailored to local conditions, and the development of maintenance protocols to ensure sustained performance. Further research is suggested to evaluate the long-term economic viability and scalability of optimized solar drying solutions across diverse agro-ecological zones, thereby contributing to improved livelihood resilience in smallholder communities.