View
213
Download
1
Category
Preview:
Citation preview
The Solar Tunnel-DryerThe Solar Tunnel-Dryer
BackgroundBackground Up to 50% of the fruits and vegetable and 25% of the harvested food grain rotten Up to 50% of the fruits and vegetable and 25% of the harvested food grain rotten
in the tropical countriesin the tropical countries During the harvest the high quantity of food can not be sold or the price is not During the harvest the high quantity of food can not be sold or the price is not
good! good! Drying in the direct sun has the risk of damaging the complete harvest by rainfall Drying in the direct sun has the risk of damaging the complete harvest by rainfall Animals decrease the quality of the productAnimals decrease the quality of the product By drying the farmer can have more income and for a longer timeBy drying the farmer can have more income and for a longer time Dried food generates a much better benefit on the market than the unprocessed Dried food generates a much better benefit on the market than the unprocessed
fruit. fruit. - Such a dryer can be built in one day for about 100$! And you really can make - Such a dryer can be built in one day for about 100$! And you really can make
money with it by selling the good quality and delicious Product!money with it by selling the good quality and delicious Product! By drying, the taste of the fruits are intensified and the nutrients are contained By drying, the taste of the fruits are intensified and the nutrients are contained
more intensely and they taste more sweet and richer. The vitamins and minerals more intensely and they taste more sweet and richer. The vitamins and minerals remain in the product beside of vitamin C, which is reduced. remain in the product beside of vitamin C, which is reduced.
Dried fruit and vegetables are freely from preservatives.Dried fruit and vegetables are freely from preservatives. Dried food has a very good nutritive quality (vitamins etc) Dried food has a very good nutritive quality (vitamins etc)
Benefits of solar drying Benefits of solar drying Dried foods are tasty, nutritious, the nutritional value and flavor of food is Dried foods are tasty, nutritious, the nutritional value and flavor of food is
only minimally affected by dryingonly minimally affected by drying Dried foods are high in fiber and carbohydrates and low in fat, making Dried foods are high in fiber and carbohydrates and low in fat, making
them healthy food choicesthem healthy food choices Vitamin A is retained during dryingVitamin A is retained during drying Storage space is minimal, easy-to-storeStorage space is minimal, easy-to-store Transportation costs are reduced; dried Products weigh only about 1/6 of Transportation costs are reduced; dried Products weigh only about 1/6 of
the fresh food productthe fresh food product The energy input is less than what is needed to freeze or can The energy input is less than what is needed to freeze or can easy-to-prepare; solar food drying is a very simple skill easy-to-prepare; solar food drying is a very simple skill longer storage of dried products outside the fridge!longer storage of dried products outside the fridge! It is a absolute safe technology. No high voltage is used, no risk of high It is a absolute safe technology. No high voltage is used, no risk of high
Temperature not any harm could be generated by the dryer. Temperature not any harm could be generated by the dryer. The food is safe, although it could be contaminated before drying. Because The food is safe, although it could be contaminated before drying. Because
of the pasteurization-effect due to “high” temperature in the dryer.of the pasteurization-effect due to “high” temperature in the dryer.
Compare traditional open air-drying Compare traditional open air-drying with the Solar Tunnel Dryer with the Solar Tunnel Dryer
Speed of drying by open air-Speed of drying by open air-drying and Solar Tunnel Dryer drying and Solar Tunnel Dryer
Benefits of solar drying Benefits of solar drying Can open new markets and income and is a good start-up technology. It improves the Can open new markets and income and is a good start-up technology. It improves the
bargaining position of farmers. Sometimes farmers sell at very low prices during the bargaining position of farmers. Sometimes farmers sell at very low prices during the harvest seasonharvest season
You can have up to 50% more productivity in agricultureYou can have up to 50% more productivity in agriculture For diabetics dried fruit prepared without adding sugar is a healthy choice instead of For diabetics dried fruit prepared without adding sugar is a healthy choice instead of
desserts.desserts. Dried fruit can be used in stews, soups and casseroles or enjoyed as snacks. It can also Dried fruit can be used in stews, soups and casseroles or enjoyed as snacks. It can also
be added to cereals for breakfast or used in making ice cream and baked productsbe added to cereals for breakfast or used in making ice cream and baked products Children like dried food because of the sweetness. Children like dried food because of the sweetness.
Compared with open-air dryingCompared with open-air drying Protection of the drying products from insects but also Protection of the drying products from insects but also
from birds, dogs, especially for drying meat and fish. from birds, dogs, especially for drying meat and fish. the product is hygienic because microorganisms, the product is hygienic because microorganisms,
insects and flies are killedinsects and flies are killed protection of rain protection of rain Protection of pollution by dust etc.Protection of pollution by dust etc. Protection of the wind which can blow away the food. Protection of the wind which can blow away the food. reduction of drying time (reduces changes through reduction of drying time (reduces changes through
spoilage)spoilage) no need to turn the product because air passes both no need to turn the product because air passes both
sides of the productsides of the product
Compared with open-air dryingCompared with open-air drying no loss of colors of the product (tomato, paprika no loss of colors of the product (tomato, paprika
powder etc)powder etc) Drying is faster because inside the dryer it is Drying is faster because inside the dryer it is
warmer than outsidewarmer than outside Less risk of spoilage because of the speed of Less risk of spoilage because of the speed of
drying. (if the drying process is slow the fruit drying. (if the drying process is slow the fruit start to ferment and the product is spoiled). start to ferment and the product is spoiled).
It is labour saving. The product can be left in the It is labour saving. The product can be left in the dryer overnight or during rain.dryer overnight or during rain.
The quality of the product is better in terms of The quality of the product is better in terms of nutrients, hygiene and colornutrients, hygiene and color
Compared with open-air dryingCompared with open-air drying butbut: : more expensive than with direct sun more expensive than with direct sun
drying (Solar dryer costs about 70 $)drying (Solar dryer costs about 70 $) if you have huge quantities to dry you if you have huge quantities to dry you
need big dryers.need big dryers.
Can be used forCan be used for - - fruitsfruits: apples, apricots, grapes, pineapples : apples, apricots, grapes, pineapples
and banana (taste great when dried), melon, and banana (taste great when dried), melon, plums, beets, mangoes, dates, figs.plums, beets, mangoes, dates, figs.
- - vegetablesvegetables (cabbage, broccoli, peppers, (cabbage, broccoli, peppers, herbs, onions, squash, tomatoes, asparagus, herbs, onions, squash, tomatoes, asparagus, celery, potatoes, peas, carrots, peppers, yams, celery, potatoes, peas, carrots, peppers, yams, red cedar)red cedar)- corn, maize, rise, cassava, cocoa- corn, maize, rise, cassava, cocoa
Can be used forCan be used for - Fish - Fish - Meat- Meat - mushrooms (may be can be cultivated in the - mushrooms (may be can be cultivated in the
dryer as well with a plastic-foil on the button)dryer as well with a plastic-foil on the button) - spices (dried chili, peppers, garlic)- spices (dried chili, peppers, garlic) - Medical plants- Medical plants - tea, coffee, cacao, tobacco, cashew and - tea, coffee, cacao, tobacco, cashew and
macadamia, milk, hay, copra (kernel of the macadamia, milk, hay, copra (kernel of the coconut)coconut)
Easy to dryEasy to dry Apples, apricots, coconuts, dates, figs, guavas, plums, avocados, Apples, apricots, coconuts, dates, figs, guavas, plums, avocados,
bananas, breadfruit, and grapes. Most vegetables, chilies, corn, bananas, breadfruit, and grapes. Most vegetables, chilies, corn, potatoes, cassava root, onion flakes, and the leaves of various potatoes, cassava root, onion flakes, and the leaves of various herbs and spices. herbs and spices.
more difficult to drymore difficult to dry: Asparagus, beets, broccoli, carrots, celery, : Asparagus, beets, broccoli, carrots, celery, various greens, pumpkin, squash and tomatoesvarious greens, pumpkin, squash and tomatoes
Fruits are ideal for preservation by drying since they are high in Fruits are ideal for preservation by drying since they are high in sugar and acid, which act to preserve the dried fruit.sugar and acid, which act to preserve the dried fruit.
- Vegetables are more challenging to preserve since they are low - Vegetables are more challenging to preserve since they are low in sugar and acidin sugar and acid
- - Drying meat requires extreme cautionDrying meat requires extreme caution since it is high in since it is high in protein what invites microbial growthprotein what invites microbial growth
- Fish drying, for example, requires thorough cleaning of the drier - Fish drying, for example, requires thorough cleaning of the drier after each batchafter each batch
Steps for drying foodSteps for drying food 1. Selection (fresh, undamaged products)1. Selection (fresh, undamaged products) 2. Cleaning (washing & disinfection)2. Cleaning (washing & disinfection) 3. Preparation (peeling, slicing etc) 3. Preparation (peeling, slicing etc) 4. Pre-treatment (e.g., blanching, anti-discoloration by coating with 4. Pre-treatment (e.g., blanching, anti-discoloration by coating with
vitamin C, de-waxing by briefly boiling and quenching, and vitamin C, de-waxing by briefly boiling and quenching, and sulfurization by soaking or fumigating. Fish is often salted)sulfurization by soaking or fumigating. Fish is often salted)
5. Drying5. Drying 6. Cooling down (wait till Temperature is down)6. Cooling down (wait till Temperature is down) 6. Packaging: Glass with airtight jars or plastic containers. And 6. Packaging: Glass with airtight jars or plastic containers. And
later for selling sealed in Plastic-bags. Plastic freezer bags are later for selling sealed in Plastic-bags. Plastic freezer bags are safe and durable. Requires packaging to prevent insect losses safe and durable. Requires packaging to prevent insect losses and to avoid re-gaining moistureand to avoid re-gaining moisture
7. Storage: dry, dark, cold7. Storage: dry, dark, cold
Professional Dryer VersionsProfessional Dryer Versions
SamplesSamples Ready dried spices
dried apples
Mixed dried food
SamplesSamples
Bread with dry-fruits, very delicious!
Muesli in the morning with dry-fruits. Can the day begin with something better?
Storage of dried fruits
Thank you for Patience!Thank you for Patience!
Contact
www.alternative-technology.de(more Information about Drying)
Email: StefanSchranner@yahoo.de
Recommended