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Solar-Food Phase II: Paraguay
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Solar-Food Phase II: Paraguay
SummaryAuthor: Jean-Claude Pulfer

Introduction
In July 2006 at the margin of the “Solar Cooker and Food Processing International Conference” celebrated in Granada, Spain various participants, within them the author, met by initiative of Rolf Behringer from ISES to design together the 2º phase of the present “Solar Food Processing and Conservation” Project, which should be executed in four different developing countries, within them Paraguay. “CEDESOL Ingeniería” was elected as subcontractor for Paraguay. It’s a company created in 1998 by the author and a Paraguayan mechanic with the aim on one hand to develop, build and commercialize within Paraguay different kinds of equipments working with solar energy such as cookers, driers and water heaters and on the other hand realize training activities at different levels in the use of solar energy. Since the year 2002 “CEDESOL Ingeniería” is also planning and installing stand alone solar photovoltaic systems and developing and building fuel saving wood stoves and biodigesters.

Since its beginnings “CEDESOL Ingeniería” is not only developing and building equipments but is also experimenting continuously with different solar food processing methods mainly with the aim to test the developed equipments and to improve them if necessary. The focus has been put on solar drying of locally available herbs (medicinal and aromatic), fruits and vegetables. But until the beginning of the present project it has never been our goal to develop ourselves solar food products and to lead them to the market, but to facilitate this activity to interested persons or institutions by transmitting them the necessary knowledge and selling them our equipments.

To strengthen and improve our training activities “CEDESOL Ingeniería” had the opportunity to purchase in 2006 for a very advantageous prize a property directly neighbor to our workshop with a simple and almost completed building with 4 rooms and an extensive yard, part of it covered with a roof. The idea was to transform this building in a place for a class room and accommodation for training course participants coming from different places of the country and abroad. And in the yard should be installed different solar equipments for practical training activities in solar food processing, such as solar driers and a community Scheffler type solar cooker. A covered part of the yard will be used to install food preparing facilities, such as working tables and sinks with running water for washing and pretreatment purposes.

Until now “CEDESOL Ingeniería” is still the only enterprise in Paraguay producing solar energy equipments. Despite of the huge offer of solar radiation almost all over the year (average daily global radiation on a horizontal surface in Asuncion: 4.8 kWh/m2) solar energy use is still very scarce. Conventional energy sources for domestic and industrial use, mainly firewood, charcoal, LPG and electricity are still relatively cheap and don’t suffer shortages. But the most important barrier for the spread of solar energy use in Paraguay is the lack of knowledge and consciousness of most people on this technology. That’s why it is very important to invest in publicity. But this is a task, which we can’t do alone without a strong support from national and international institutions. Because of the very low cash flow coming from the selling of our products and services our financial resources are very limited.

Author Address Mr. Rolf Behringer
International Solar Energy Society (ISES), GloboSol
Wiesentalstr 50
Freiburg
79114
Germany
AffiliationNGO
Status[]
CategorySolar Cooking, Solar Drying
Implementation Date /
Detailed Description

Activities and Outcomes

The first rate of the grant to finance the present project reached to our bank account on April 26th. Previously we elaborated an activity and time schedule for the whole project period of 12 months. As the recently purchased property was not yet in conditions to realize properly any activity in the frame of the project, it has first to be arranged to convert it in a real solar food processing training center.

 

First of all, the yard of the property had to be cleaned and freed from garbage. Several trees had to be cut to get enough space to make possible the installing of the solar equipments and enough sunlight for their proper operation during most part of the day.

Inside the building were realized various activities. The 2 small neighbor rooms have been converted into one big room eliminating the separation wall between them, obtaining this way an area big enough (31 m2) to be used as a classroom for up to about 30 participants. When we bought the property the whole building had just a concrete underfloor, so that it was entirely covered with floor tiles. Also the bathroom inside the house was covered with floor and wall tiles. In front of the house was built a kind of sidewalk covering it also with floor tiles (total area of flooring: about 100 m2). The next activity consisted in checking and improving where necessary the electrical distribution and lighting system of the building. All these reforming works were financed with part of the funds destined to the item “implementation of technology”.

 

In August 2006 started in our site a one year training program for 5 young Brazilian technicians, who are members of the so called MST (movement of the landless rural workers of Brazil). The program was financed by the Spanish NGO “Grupo de Cooperación del Campus de Terrassa GCCT”. It was divided into 5 modules (solar water heaters, solar cookers, wood saving stoves, solar dryers and biodigestors). Our role was to teach them theoretical and practical aspects of the construction and use of the different technologies to make them able to replicate them in their respective places of residence in the southern part of Brazil, which are MST owned agricultural schools.

Most of the equipments built during this training program were destined to be used for the solar food processing training center, especially a solar water heater, a family size parabolic solar cooker, an industrial Scheffler type solar cooker, a small size tent solar dryer, an industrial tunnel solar dryer and an underground fixed dome biodigestor. The biodigestor was built in the place of an existing dry well, which has never been used. It will be fed with organic residues coming from the food processing activities and from one of the toilets. To generate sufficient biogas more organic residues will have to be brought from other places, such as manure from pigs and cattle, which can easily be purchased locally. The biogas will be used as backup energy for the tunnel solar dryer and the industrial solar cooker during overcast days and during the night. The 2 last modules of this training program were realized during this first phase of the present project (July and August 2007), so that during this period the activities in the frame of the present project had to be reduced to a minimum.

Besides, this year autumn and winter (April to September) was unusually cold in Paraguay. Normally, the temperatures rarely fall below 15ºC or if so just for a few days.

Since the beginning of May until the end of August it was often cold with temperatures below 15 and even below 10ºC. Most of the times the cold periods are accompanied by overcast sky and drizzle. Since the end of August temperatures have increased significantly but occurred another adverse phenomenon. In the countryside people started to burn their lands to prepare them for the agricultural season. Because of the drought these fires became uncontrollable and are actually destroying huge areas of forests and grasslands. Despite of the lack of clouds almost the whole country was covered during the last three weeks with dense smog. These circumstances made it very difficult to realize solar food processing activities during most of this first project period.

Until now “CEDESOL Ingeniería” did not have any own website to promote its products, services and activities in the internet. That’s why we decided to use part of the project funds destined to “advertisement” to create our website (www.cedesol.com.py). Once it will be operating properly (in about 2 months), it will be used also as a platform to promote solar food products developed in the frame of this project.

Outlook

From October this year on, once ready the infrastructure of the center and under better climate conditions expected for this period, will be initiated the proper activities of development of solar food products planned to last until January 2008. We have selected 2 different kinds of solar processed food products to be developed, will mean on one hand dried fruits (banana, pineapple and mango), vegetables (tomato, garlic and onions) and herbs (stevia, peppermint and oregano) and on the other hand 2 kinds of sweet bars, one made of toasted peanuts and brown sugar, which is a typical Paraguayan product called in Spanish “dulce de maní”, and another of a new kind made of dried fruits, cereals, bee honey and toasted sesame, which we want to promote as a snack for school children, who get milk from the national or regional government. In Paraguay the months of December to February are usually of a very hot climate and of less productive activities. Schools are closed and for many people it is the period of summer holidays. Therefore the testing and promotion activities for the solar processed food products will be realized during the last months of the project period.