POWER February 2016 - 49
TECHNOLOGY
2. A rural innovation. A biomass gasifier invented by Rai Singh Dahiya, an Indian farmer
who never received a formal education, produces low-cost power. Courtesy: National Innovation
Foundation
trical energy, with surplus heat available for
cooking (Figure 3).
In a thermoacoustic engine, heat is supplied
from a source to a gas (in this case,
air in the Score-Stove) via the hot heat exchanger
(HHX). The heat is then removed
via the ambient heat exchanger (AHX), and
the gas undergoes repetitive thermal expansion
and rarefaction to produce acoustic energy.
Between the HHX and AHX is a porous
material (a regenerator) with a temperature
gradient across it to sustain a resonant acoustic
wave. A linear alternator within a closed
loop converts the acoustic wave into electricity.
In a field trial of the design, the linear
alternator was implemented using a low-cost
loudspeaker working in reverse. The sound
emitted by the stove is no louder than a hum.
After the research phase was completed
is estimated to cost less than half the cost per
unit power when compared to normal electricity
grids costing 4 [rupees] per unit [$0.06]. "
A Power-Generating Cook Stove
Local universities in Bangladesh and Nepal
and rural communities in Kenya have tested
and advanced the Score-Stove, a sound-powered
stove that also generates electricity. Developed
by the Department of Electrical and
Electronic Engineering at the University of
Nottingham, the stove uses thermoacoustic
technology to convert heat from wood, dung,
or crop residuals into sound and then elecin
2012, the second generation of the $90
Score-Stove (Score-Stove 2) showed that it
could produce 23 W using wood as fuel and
37 W under lab conditions. Rural trials have
proven that the device can produce enough
power for two LEDs while cooking a meal.
The stove was developed as a means to reduce
health problems that occur from chronic
exposure to smoke and other pollutants emitted
by rudimentary wood-fired cook stoves
's premium
product showcase
for the latest
products and
technologies in the
power generation
industry.
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POWER February 2016
Table of Contents for the Digital Edition of POWER February 2016
Contents
POWER February 2016 - Cover1
POWER February 2016 - Cover2
POWER February 2016 - Contents
POWER February 2016 - 2
POWER February 2016 - 3
POWER February 2016 - 4
POWER February 2016 - 5
POWER February 2016 - 6
POWER February 2016 - 7
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POWER February 2016 - Cover3
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