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close this bookAppropriate Community Technology - A Training Manual (Peace Corps; 1982; 685 pages)
View the documentThe Farallones Institute Rural Center
View the documentCHP International, INC.
View the documentPreface
View the documentAcknowledgments
View the documentIntroduction
Open this folder and view contentsPhase I: Introduction to training
Open this folder and view contentsPhase II: Earthen construction and fuel-saving cookstoves
Open this folder and view contentsPhase III: Pedal/treadle power
Open this folder and view contentsPhase IV: Solar water heaters
close this folderPhase V: Solar agricultural dryers
View the documentPhase V Calendar
View the documentSession 1. Introduction to agricultural dryers
View the documentSession 2. Tour of solar dryers
View the documentSession 3. Solar agricultural dryer design procedures and rules of thumb
View the documentSession 4. Two-hour dryer construction
View the documentSession 5. Review of existing solar dryer plans
View the documentSession 6. Smoke testing solar dryers
View the documentSession 7. Introducing new technologies: solar dryers
View the documentSession 8. Design of solar agricultural dryers
View the documentSession 9. Site selection and preparation
View the documentSession 10. Construction of solar agricultural dryers
View the documentSession 11. Issues and methods in development and diffusion of appropriate technology
View the documentSession 12. Natural cooling
View the documentSession 13. Approaches to health systems
View the documentSession 14. Nutritional gardening
View the documentSession 15. Practical drying tips
View the documentSession 16. Cardiopulmonary resuscitation
View the documentSession 17. Dryer assessment and modification
View the documentSession 18. Introduction to cost benefit analysis (cba)
View the documentSession 19. Presentation of solar dryers
View the documentSession 20. Introduction to the final phase of the training program
Open this folder and view contentsPhase VI: Concluding the program: The energy fair
Open this folder and view contentsAppendices

Session 5. Review of existing solar dryer plans

Total time:

2 hours


* To identify and list criteria for evaluating solar dryer designs


* To evaluate solar dryer designs


* Brace Research Institute, A Survey of Agricultural Dryers


* Ministry of Energy, Philippines, Proceedings of the Solar Drving Workshop


Newsprint and felt-tip pens, assorted solar dryer plans

Trainer Notes

To carry out this session, you will need to gather a large assortment of solar dryer plans. These can be found in the resource materials and in the publications listed in the bibliography.


Step 1. (5 minutes)
Review the objectives and outline the session activities.

Step 2. (20 minutes)
Have the participants brainstorm a list of criteria that can be used to evaluate solar dryers.

Trainer Notes

Add to the list by mentioning the following questions:

* Is the collector large enough to provide sufficient heat?
* Are the vents adjustable and/or large enough to allow adequate air flow?
* Can the collector tilt be built or adjusted for the specified latitude and time of year?
* Is the size adequate for the amount of material to be dried?
* Can the system be built efficiently and easily with low cost materials?
* Is it weather and pest proof?
* Are there any design features that would make it impractical in the proposed socio-cultural setting?

Step 3. (10 minutes)
Distribute the various dryer plans and briefly explain them.

Step 4. (30 minutes)
Have the participants form their construction groups and evaluate the solar dryer plans according to the list developed in Step 2.

Trainer Notes

* Explain that each group should evaluate as many sets of plans as there are group members and that they should prepare to present their evaluations to the assembled groups.

* Distribute newsprint and felt-tip pens and encourage the groups to prepare graphic presentations.

Step 5. (50 minutes)
Reconvene the groups and have them give their presentations.

Trainer Notes

* Explain that each group member should give a brief presentation of a device.

* Encourage questions, comments and discussion at the end of each presentation.

Step 6. (5 minutes)
Conclude the session by noting that a large variety of solar dryer designs have been reviewed and that this experience will be useful when they design their own solar dryers.

Trainer Notes

Remind the participants to keep the list of criteria that was developed in this session and use it when they design their dryers.

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