Assomada Solar Desalination Project

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Assomada Solar Desalination Project
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Solar project phaseIII Eng img 1.jpg
Project Type(s): Project Sector(s): Water sanitation Water sanitation.gif

Community Name: Assomada
Country: Cape_Verde
Volunteer(s) Name: Nicholas Hanson,Brian Newhouse
Volunteer(s) Homestate: Virginia, Georgia
Year of project approval: 2008
Project located: yes
Projects started in Cape_Verde 2008 (2).
Assomada Solar Desalination Project, Small Enterprise Development Project on the Island of Fogo
Flag of Cape Verde.svg
Other Projects in Cape_Verde (10).
Assomada Solar Desalination Project, Boys Camp 2009, Desol, Fog Collection System Serra Malaguetta, High School Drafting Course, People to water cycle, Restoration of School Furniture and Equipment, Small Enterprise Development Project on the Island of Fogo
State Flag of Virginia.svgOther Projects by Volunteers from Virginia (28).
Abomey Secondary School Renovation and Addition, Achajur Water Supply Pipeline Mapping, Assomada Solar Desalination Project, Ballin' in Benin, Mike Bouchard, Building sustainable livihoods in Tavush marze, Community Pre-school and Library, Will Dickinson, Elementary School Improvement, English Language Summer Camp, English Resource Center (Kazakhstan), Volunteers who served in Russia, Russia volunteers, Family Training Center, Feghana Nurses Technical and Non-Formal Education Trainings … further results
Other Independent Projects by Volunteers (13).
Water sanitation.gifOther Water sanitation Projects by Volunteers (3).
Achajur Water Supply Pipeline Mapping, Assomada Solar Desalination Project, Water Pump Replacement Belize
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See Appropriate technology information on Assomada Solar Desalination Project at:Assomada Solar Desalination Project at Appropedia.

Info about the Assomada Solar Desalination Project



[edit] Solar Desalination Project – Phase III

Solar project phaseIII Eng img 0.jpg
Solar project phaseIII Eng img 2.jpg
Solar project phaseIII Eng img 1.jpg

22 September 2008 Cape Verde

To potential lender and other interested parties:

The purpose of this project proposal is to obtain 22580 ECV (298 USD) to purchase materials to build, and inform interested people about, the third phase of a solar desalination project at the Technical School in Assomada, Cape Verde.

[edit] Introduction

With <200mm of rainfall, saltwater infiltrated wells and expensive oil-guzzling desalination plants as the main source of fresh water in Cape Verde, it is important to consider researching alternative sources of production. As an island country with endless supply of seawater and over 3000 hours of annual sunlight, Cape Verde is an ideal country for solar desalination.

The goal of the project is to design a high output, cost-effective model using local materials. If a cheap design with reasonable output can be engineered, it could create both an industry of employment for young Capeverdeans and, given the abundant supply of sun and saltwater, a reliable source of fresh water for the country.

[edit] Project Analysis

This is the third phase of this solar desalination project:

Phase I -The first phase was a 0.82m2 prototype model completed and tested in December 2007. The completed system produced 1.75L of distilled water per day and cost 16,000CVE (210 USD). The output was believed to be low because of the distance the water had to rise to condense on the glass. Adjustments were made in the second phase.

Phase II -The second phase – designed and constructed by (now Returned) Peace Corps Volunteer Nicholas Hanson, -was an improved 1m2 model redesigned to include three shelves of water (7cm deep) to decrease the height of condensation. Additionally, a solar water pre-heater (an enclosed 0.7m2 box with 4m of zigzag plastic tubing) was constructed to preheat the saltwater before it entered the still. At the first test however, the hot water heater burst under pressure at the 90º elbow joints of the zigzag. The second phase was completed in July 2008. It produced x L of distilled water per day and cost 16,250 ECV (214 USD) (production/price not including the solar water heater).

Design improvements for the third phase include decreasing the depth of the water for faster evaporation time, repairing/modifying the solar water pre-heater and dripping the saltwater from the water heater through the still into a brine pool to prevent salt build-up.

[edit] Proposed Model Specifications -Phase III

The proposed third phase model consists of a design using corrugated concrete panels as the main design modification – maintaining a short distance between the saltwater basin and glass and decreasing the depth of each shelf (<2cm). The hot water heater will be modified to a large circular tube layout, rather than the zigzag layout, in order to prevent high-pressure spots on the plastic tube. The prototype model will also be attached to the drain of the new still model to serve as a slower-distilling output reservoir (brine pool).

When activated, saltwater will drip through the solar hot water heater into the phase III still. When the undistilled, very salty seawater, reaches the bottom undulation of the 10º-23º angled still, it will drain into the prototype basin – thus avoiding corrosive salt build-up and maintaining a closed system in the improved model and, in theory, making it easier to remove the salt/residue of the seawater once the water has evaporated.

Note: Construction of the still, as was the first two phases, will be performed with the Civil Construction students at the Grau Duque Henri Technical School in Assomada, Cape Verde. All models utilize local construction materials.

Complete proposals, design plans and bill of materials can be found at

Design plans

Schematic solar still phase III, solar water heater

[edit] Budget / Bill of Materials

Solar Still, Phase III Model: 1 USD = 76 CVE

Solar Water Heater, Phase III Model: $160.26

Item #
50m 160psi
0,75cm plastic
8m wood pieces to clamp tube ring
Drip Valve
Connection to tank, still
Total= $136.84

[edit] Request

To build the solar still and water heater, 22580 ECV (298 USD) will be required to purchase materials.


Nicholas Hanson

Brian Newhouse

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