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Brad Rogers Mark Henderson Michael Pugliese College of Technology and Innovation Arizona State University at the Polytechnic Campus

The Twig Light: Ultra low-cost lighting in Ghana

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This session describes the development of a new, low cost, sustainable light source for poor villagers in developing countries called the Twig Light. The light makes use of a compact thermoelectric generator sandwiched and providing a thermal bridge between two pieces of ten-centimeter aluminum channel approximately fifteen centimeters in length. The lower section is cooled by sitting it in a small amount of water, while the upper section serves as a combustion chamber in which small pieces of wood or other combustible materials are burned. The subsequent temperature difference across the thermoelectric generator results in enough power to light a bank of LEDs sufficient to illuminate a small room. The technology was distributed in the rural Ghanaian village of Domeabra in the summer of 2009, and the performance will be evaluated during a return visit in 2010.

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Page 1: The Twig Light: Ultra low-cost lighting in Ghana

Brad Rogers Mark Henderson Michael Pugliese

College of Technology and Innovation Arizona State University at the Polytechnic Campus

Page 2: The Twig Light: Ultra low-cost lighting in Ghana

The results are:

1. New products for the BoP to improve lives

2. New business ventures to build village economies

3. Life-changing educational experiences for students.

GlobalResolve improves the world by building partnerships to create technological and economically sustainable solutions for villages in the developing world.

Page 3: The Twig Light: Ultra low-cost lighting in Ghana

The GlobalResolve Method

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•  Gelfuel production system •  Efficient stoves for

Gelfuel •  Jatropha Curcas

partnerships •  Low cost water filters •  Fire into Ice project •  Orange juice

pasteurization system •  Developed at request of Chief

Page 10: The Twig Light: Ultra low-cost lighting in Ghana

•  Classes provide “traditional” education and incubate and develop ideas

•  Undergraduate students are engaged in design for the BoP market

•  Courses Include: 1.  Traditional Engineering capstone sequence (6 credits) 2.  Three semester interdisciplinary capstone sequence (6-9

credits) 3.  Village Energy Systems

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•  One semester, 3 credits •  Seniors, Graduate students •  75% Engineering students •  Format is Problem Based Learning •  Class requirements:

–  Class project for BoP market •  Chosen by Instructor

–  Individual project for BoP market •  Chosen by each student based on their interest and talents

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•  Graduate Student (Michael Pugliese) decided to address the problem of clean, safe and affordable lighting

•  Solution was to utilize a Thermoelectric Generator to power a bank of LEDs.

Page 13: The Twig Light: Ultra low-cost lighting in Ghana

•  Upper and lower chambers are aluminum channel

•  Lower chamber sits in pan of water

•  Supported by NCIIA and manufactured in ASU labs

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•  Successful products require field testing in a well understood environment

•  Domeabra is a typical rural African village, and is serving as a Village Laboratory

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•  Villagers preferred to use leftover coals from cooking fires to power the unit

•  The increased surface temperatures from the hot coals led to burnout of the TEGs. – This was not observed in the limited testing with

twig combustion •  Initial student designed prototypes from the

capstone suffered the same fate – Thermal control is a key

Page 19: The Twig Light: Ultra low-cost lighting in Ghana

•  Combustion based lighting is expensive and unpleasant, but is often all that is available.

•  Competing “clean” technologies include PV coupled with rechargeable batteries and direct battery devices. –  Solar PV systems are typically more than $30.

•  D Light claims a $10 product will be out soon

•  Twig Light material costs are in the range of $10. –  Advantage of Twig Light – no need to wait for the Sun to

recharge

•  Attending the Lighting Africa conference in Kenya for more careful assessment

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•  Engineering Capstone team developing next generation for field testing – Power unit

•  Thermal Management has been primary design constraint

– Application unit •  LED arrays •  Cell phone charging •  High frequency sound for mosquito control (?)

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•  Capstone students are graduating soon •  New team of students applying for Edson

entrepreneurial grant to develop business •  Product design efforts have been initiated

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Page 24: The Twig Light: Ultra low-cost lighting in Ghana

•  Several villages, with Domeabra being the largest

•  About 30 square miles •  More than 10,000 people •  Typical income is less than $2 per day, usually

less than $1 •  Most villager’s income is primarily obtained

from small farms

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•  Village appraisal meetings provide a forum to establish trust.

•  Villagers use products under realistic conditions and report on performance.

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•  Nana Frempong Afaokwa: –  Graduate of the Massachusetts

Institute of Technology in Mechanical Engineering

–  Started and operated a successful manufacturing business in New York for 25 years

–  Returned to Africa as Paramount Chief of the Domeabra Traditional Area in the Asante region of Ghana

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•  Our partners in Domeabra and at KNUST provide continuous feedback to us.

•  Product improvements are made in Arizona as needed, and further tested in Domeabra. –  Principles of Design for Extreme Affordability are always

followed –  All products will be manufactured in Africa to the extent

possible

•  When the products are shown to be reliable and useful in the African environment, supply chains are identified and the product is offered in the greater market

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•  GlobalResolve is having an impact •  More than 100 students have been involved in

GlobalResolve projects •  18 ASU students have worked on the ground

in Africa on GlobalResolve projects •  We are just beginning!

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•  Water capture in Gamoa-Dago •  Twig Light optimization, marketing, supply chain (KITE) •  Cell Phone charging attachment for twig light •  Gelfuel demonstration at Kumasi elementary school •  Fire into Ice project •  Jatropha Curcas as a Village Energy Resource

–  Extraction –  Diesel based multifunction platforms –  Cooking –  Industrial fuel for Suame Magazine

•  Developments in Uganda •  Certificate Program at ASU •  Global Innovation capstone at ASU

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•  Seniors in Engineering at the Polytechnic Campus – Students given opportunity to work on BoP

problem – Gelfuel production facility –  Improved Gelfuel stoves – Development of Twig Light

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•  Interdisciplinary, International, Intercultural approach to reduction of extreme poverty through social entrepreneurship

•  Travel, learn and identify problems. •  Form global teams to address problems

–  Students –  University Faculty –  Villagers and Chiefs –  NGOs –  Government organizations

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• We ask the questions: •  What are the problems? •  Who can solve the problem? •  Who can implement the solution? •  What funding sources are available?

• We create alliances for expertise, connections and funding •  Universities, Companies, Foundations

• We involve partners on the ground •  Villagers, Companies, NGOs, Local university students

KITE

Villages