Discussion
In which phase of the solar dryer construction, parallel strings must be drawn tightly between the laminated parabolas at 2.5 to 7.5 cm intervals?
Answer: D
The step is installing the aluminium foil reflection surface. In a parabolic solar dryer the strings are pulled tightly across the laminated parabolas at intervals of 2.5 to 7.5 cm so that the foil can be laid on them and supported.
I could not find a source for the construction instructions, so this rests on the key.
The strings across the parabolas support the aluminium foil that reflects sunlight onto the drying tray. The step is installing the reflection surface.
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