Thermal analysis and performance evaluation of a solar tunnel greenhouse dryer for drying peppermint plants

Three identical solar tunnel greenhouse dryers under forced convection mode were installed for drying peppermint plants. Thermal analysis of the solar tunnel greenhouse peppermint dryer was investigated based on thermal balance equations in order to predict its performance. Performance of solar greenhouse dryer was studied as a function of change in plant conditions, air flow rates and peppermint loads under two fan operating systems and evaluated in terms of system temperatures, drying rate, drying efficiency, product quality and drying cost.