The meteorological parameters as well as the mass and the
product temperature are measured during the drying operation.
Eight K-type thermocouples were fixed at different locations
of the solar drier and in open sun to measure the temperature.
The solar radiation incident on a horizontal surface was
measured with a Kipp and Zonen pyranometer in a range of 0-
1000W/m2.Wind speed was measured by a 0–20 m/s range
anemometer. The relative humidity of ambient air and drying
air was periodically measured by a HMP155A sensor. All
climatic and measured parameters are sample recorded every
10 min using a CR5000 data logger (Campbell Scientific Inc).
The air speed at the ambient and inside of the dryer was
manually recorded during the drying experiments. Product
samples were weighed periodically using a digital balance