A solar tunnel dryer with 122.95 m2 solar collector area was sufficient for drying handmade paper from 53.85% to 9.96% moisture content (dry basis) in 4–5 h. The schematic design of solar tunnel dryer is shown in fig 1: All dimensions in mm Fig. 1: Schematic diagram of solar tunnel dryer 2) Solar tunnel dryer with controlling circuit: Solar tunnel dryers parameters are tested and controlled using Arduino as shown below BLOCK DIAGRAM Fig. 2: Block diagram of solar tunnel dryer CIRCUITRY 1. Arduino Uno The solar drying behavior of tomato slices in a twin layer solar tunnel dryer were adequately described by Page model. The Effective moisture diffusivity values for twin layer solar tunnel dried tomato slices vary from 5.07*10 −10 to 6.08 × 10 −10 m 2 /s which is much higher than open sun dried samples. The schematic design of solar tunnel dryer is shown in fig 1: All dimensions in mm Fig. 1: Schematic diagram of solar tunnel dryer 2) Solar Tunnel Dryer with Controlling Circuit: The above solar tunnel dryers parameters are tested and controlled using Arduino as shown below 5. BLOCK DIAGRAM Fig. 2: Block diagram of solar tunnel dryer CIRCUITRY 1. An indirect two-stage solar tunnel dryer has been developed to study the drying characteristics of two chili pepper varieties. The effect of chili layer density on the drying time and moisture The payback period, which is 2.10 years, is shorter than the dryer’s anticipated lifespan of around 10 years. A solar tunnel dryer’s payback period is four years for basic mode dryers and three to four years for optimum mode dryers . An analysis of the cost of a hybrid photovoltaic greenhouse dryer was conducted in . .

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