3.5.2 Cost analysis of solar dryer
Solar dryer consists of two main components, collector and the drying chamber.
Collector:
The roof of the collector should admit short wave radiations components of the solar radiation spectrum and
block the long-wave radiations emitted by the heated absorber. The temperatures reached are up to 800C to 900C, and
the materials should withstand them. Three choices are glass, acrylic and transparent polycarbonate sheets.
Glass is costlier and heavy, but has a long life. Acrylic is lighter and cheaper, but is affected by temperature,
UV radiations and the weather. Polycarbonate sheets are quite light and inexpensive and are used for agricultural
polyhouses, where their life span is taken as five years. The cost of constructing support structure for roof is taken as
20% of the material cost. With these assumptions, the cost of mounted collector i.e. a complete dryer assembly
(without drying chamber) with a 2mm thick glass roof is INR360/m2. That for 2mm thick acrylic is INR180/m2, and
of plastic used in polyhouse it is INR72/m2.
Drying chamber
Drying chamber is constructed from lightweight plywood, which has same properties as that of plywood
which is used for giving support to the absorber plate. Material cost for constructing the drying chamber is 50/m2 of
collector area.
Total cost of dryer
Total cost of dryer = collector cost + drying chamber cost + fabrication cost
= 72 + 50 + (72+50)
= INR 244 /m2 of collector area,
3.5.2 Cost analysis of solar dryerSolar dryer consists of two main components, collector and the drying chamber.Collector:The roof of the collector should admit short wave radiations components of the solar radiation spectrum andblock the long-wave radiations emitted by the heated absorber. The temperatures reached are up to 800C to 900C, andthe materials should withstand them. Three choices are glass, acrylic and transparent polycarbonate sheets.Glass is costlier and heavy, but has a long life. Acrylic is lighter and cheaper, but is affected by temperature,UV radiations and the weather. Polycarbonate sheets are quite light and inexpensive and are used for agriculturalpolyhouses, where their life span is taken as five years. The cost of constructing support structure for roof is taken as20% of the material cost. With these assumptions, the cost of mounted collector i.e. a complete dryer assembly(without drying chamber) with a 2mm thick glass roof is INR360/m2. That for 2mm thick acrylic is INR180/m2, andof plastic used in polyhouse it is INR72/m2.Drying chamberDrying chamber is constructed from lightweight plywood, which has same properties as that of plywoodwhich is used for giving support to the absorber plate. Material cost for constructing the drying chamber is 50/m2 ofcollector area.Total cost of dryerTotal cost of dryer = collector cost + drying chamber cost + fabrication cost= 72 + 50 + (72+50)= INR 244 /m2 of collector area,
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3.5.2 Cost analysis of solar dryer
Solar dryer consists of two main components, collector and the drying chamber.
Collector:
The roof of the collector should admit short wave radiations components of the solar radiation spectrum and
block the long-wave radiations emitted by the heated absorber. The temperatures reached are up to 800C to 900C, and
the materials should withstand them. Three choices are glass, acrylic and transparent polycarbonate sheets.
Glass is costlier and heavy, but has a long life. Acrylic is lighter and cheaper, but is affected by temperature,
UV radiations and the weather. Polycarbonate sheets are quite light and inexpensive and are used for agricultural
polyhouses, where their life span is taken as five years. The cost of constructing support structure for roof is taken as
20% of the material cost. With these assumptions, the cost of mounted collector i.e. a complete dryer assembly
(without drying chamber) with a 2mm thick glass roof is INR360/m2. That for 2mm thick acrylic is INR180/m2, and
of plastic used in polyhouse it is INR72/m2.
Drying chamber
Drying chamber is constructed from lightweight plywood, which has same properties as that of plywood
which is used for giving support to the absorber plate. Material cost for constructing the drying chamber is 50/m2 of
collector area.
Total cost of dryer
Total cost of dryer = collector cost + drying chamber cost + fabrication cost
= 72 + 50 + (72+50)
= INR 244 /m2 of collector area,
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