I was wondering why the solar dryer was positioned on far front of the building near the street side. I know the solar dyer needs sun’s energy to perform its function and needs to be on open field. However, it seemed not made of sturdy materials and would break apart against strong wind blows. Taking the equipment indoor should be a good option but there was a group of big black stones at the bottom that would make transfer near to impossible. Maybe the stones was serving as structural support. Unknown period of time passed and what I expected happened. I saw it was broken after a typhoon.
The information I accidentally read on bulletin board answered some of my questions, plus bonus additional knowledge. Read it below.
A solar dryer uses passive solar energy. It converts the sun’s energy into heat without the application of any mechanical device. The structure of the solar dryer serves as the thermal mass that provides the means to collect solar energy and convert it to heat. Thermal mass can be increased by laying stones or small boulders painted black to serve as heat collectors at the base of solar dryer. Air heated by the thermal mass expands thereby increasing its capacity to remove moisture. Furthermore, heated air will rise up and exit through a vent at the top of the structure. This chimney effect ensures a continuous flow of air through the materials being dried.
The solar dryer can be used in a wide range of products such as dried seafoods, seaweeds, banana chips, dried fruits, dried herbs, coffee beans, dried chili, dried flower and etc… almost any kind of agricultural produce.
The plastic enclosing the drier is made of MacPlas Heliofilm which should have an expected service life of 5 years.
Note: I am not sure if the broken solar dryer and the solar dryer on illustration are of the same type.