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Solar dryer
1. Polycarbonate Sheet – Covered Green
House Solar Dryer
From : Yogendra Pratap Singh
Mobile : 7880890999
2. Greenhouse Solar Dryer
Introduction:
The Green House Solar Dryer was invented by
Prof. J Serm from Silpakorn University, Bangkok,
Thailand which uses Covestro’s polycarbonate
sheet ‘Makrolon®’.
It became an instant success in Thailand with
almost 400 units being within a short span of 4
years.
Green House Solar Dryer dries various products
including fruits, vegetables etc. in a hygienic
manner, allowing the farming communities to
open new revenue streams.
In India already installed more than 250+
numbers
The first version of the
parabolic greenhouse solar
dryer built in 2003 at Silpakorn
University, Thailand
Natural Sun Drying Method
3. What is Solar Dryer?
Time saving, Hygienic, & No animal damage
Solar Dryers are devices that use Solar Energy to dry substances especially
food. There are two general types of solar dryers.
1. Direct Solar Dryer
Direct solar dryers expose the substance to
be dehydrated to direct sunlight. They have a
black absorbing surface which collects the
light and converts it to heat; the substance to
be dried is placed directly on this surface.
These driers may have enclosures, glass
covers and/or vents to in order to increase
efficiency.
2. Indirect Solar Dryer
Indirect solar dryers, the black surface heats
incoming air, rather than directly heating the
substance to be dried. This heated air is then
passed over the substance and exits through
a chimney, taking moisture from the
substance with it.
5. Methods of Solar Dryer
Natural Circulation Solar Dryer Forced Circulation Solar Dryer
6. Greenhouse Solar Dryer
The idea of a greenhouse dryer is to replace the function of the solar
collector by a green house.
The roof and wall of this solar dryer can be made of transparent materials
such as glass, fibre glass.
The transparent materials are fixed on a steel frame support or pillars with
bolts and nuts and rubber packing to prevent humid air or rain leaking into
the chamber.
To enhance solar radiation absorption, black surfaces should be provided
within the structure.
Inlet and exhaust fans are placed at proper position within the structure to
ensure even distribution of the dryer.
9. Greenhouse Solar Dryer
The first version of the parabolic greenhouse solar
dryer built in 2003 at Silpakorn University, Thailand
10. Sizes of the Greenhouse Dryers
Size
Area of the base
(Width x Length)
Loading capacity for fruits or
vegetables
Small 8 m X 6.2 m 100 - 200 kg
Medium 8 m X 12 m 500 - 600 kg
Large 8 m X 20 m 900 - 1,000 kg
Very large 8 m X 27 m 1,200 - 1,500 kg
Except for the small size, each dryer has a LPG burner to supply supplementary
heat to the dryer in case of rain and adverse weather conditions.
11. Sizes of the Greenhouse Dryers
Small Medium
Large Very Large
12. Benefits of Solar Dryer
Less drying time. Eg: Banana: Traditional drying 6-7 days. Solar
Dryer 2-3 days
Reduces losses caused by the spoilage / wastage up to 50%.
Better hygienic standard: Less dust, Less pollution, No fungus, No
animal / birds / insects
Weather “Resistance”: Wind and rain no longer the obstacles
Better Product Quality: Color, skin and original taste retention
Can maintain 80-95% highly important nutrition values
Can control the temperature inside the dome.
16. Challenges in Solar Dryers
1) Sheets become yellow within 2-3 years therefore drying
efficiency and food quality reduced
2) Sheets are expanding / buckling outward / coming out from
profiles and leaking so production loss
3) Required sheet length for dryer is 8.2m but standard length
available in the market is 11.8 therefore project cost is high
4) Ready stock not available from standard suppliers therefore
substandard PC sheets are used
5) No quick support to problem after installation
6) Very poor product promotion for dried food products
17. What We Should Do
1) Promote high quality standard MW PC sheets exclusively for
Solar Dryer
2) Increase the UV coating thickness to 80 micron
3) Make standard size is 6mm x 1.22 m x 8.2m both end closed
with higher gramage >1.3 kg
4) Special packaging arrangement like edge protector etc because
it has to go for remote location
5) Use different colour masking with IS - 14443 marking and Lot No
identification with Warranty only 5 years
6) Install few Demo Solar Dryer in various location for promoting
our PC sheets
7) Make DIY kit or Pre installed Dryers jointly with Vivunes so that
time, & cost saving
8) Domes and Pyramid for Micro Solar Dryers
18. Project Cost
1) Large Size Dryer = 800 sqft
2) Rs 900 / Sqft x 800 Sq ft = 7,20,000/
( Including Foundation + Labour + In site Installation)
3) Government subsidy is 50%
4) PC Sheets consumption per project is
MW PC 6mm x 1.22 m x 8.2 m – 14 Sheets (180 kg per Dryer)
PC Sheets has major Role in the Project
19. Conclusion
1) In a country like India where 300 days out of 365 days are
sunny have a huge asset of solar energy
2) Government is also promoting the use of renewable
sources of energy like solar energy by providing subsidies
on solar pumps , solar water heater , solar panels , solar
lights etc.
3) Use of solar energy costs us nothing.
Doubled the Farmers Income by Reducing the post harvest wastage
