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Mist fire-fighting system to be tested on STS-107 Flight



Submitted by Arthur - N1ORC

January 7, 2003
 
Steve Roy
MSFC, Huntsville, Ala.                                                 
(Phone: 256/544-0034)
 
Beth McKnight
Colorado School of Mines, Golden, Colo.
(Phone: 303/440-4720)
 
 
RELEASE: 03-004
 
During January Shuttle flight, companies to test environmentally
friendly,
mist fire-fighting system
 
During a January flight of Space Shuttle Columbia, astronauts will test a
new commercial fire-fighting system that puts out blazes with a fine
water
mist -- instead of using harmful chemicals or large quantities of water
that
damage property.
 
"The fire-fighting industry is in search of a new tool that doesn't use
dangerous chemicals or douse fires with huge quantities of water that
cause
extensive property damage," said Mark Nall, director of the Space Product
Development Program at NASA's Marshall Space Flight Center in Huntsville,
Ala. "By flying this commercial experiment on the STS-107 Columbia
mission,
NASA is helping industry design a cost-effective, environmentally
friendly
system for putting out fires."
 
Until recently, halons, bromine-based compounds, were used to attack
fires
chemically -- especially in places like computer rooms, aircraft, and
document storage rooms where water sprinklers were inappropriate. In
1998,
the production of these chemicals was banned worldwide because they
damage
Earth's protective ozone layer.  This part of the atmosphere shields us
from
the Sun's harmful ultraviolet radiation. 
 
We are working to find an acceptable replacement for halons, and water
mist
appears to be the best choice," said Dr. Thomas McKinnon, lead scientist
for
the research at The Center for Commercial Applications of Combustion in
Space (CCACS) at the Colorado School of Mines in Golden.  This NASA
Commercial Space Center specializes in helping industry conduct
combustion
research in space through NASA's Space Product Development Program at the
Marshall Center.
 
"The Shuttle tests use a humidifier-like device to produce water drops
about
20 microns in size," said Dr. Angel Abbud-Madrid, the project scientist
at
the NASA Commercial Space Center.  "That's about one-tenth the diameter
of a
human hair, as opposed to drops produced by conventional sprinklers that
are
about one millimeter, or 50 times the size of our droplets."
 
The water mist research team is working with MicroCool Inc., a division
of
Nortec Industries Inc., in Palm Springs, Calif., and Fogco Systems Inc.
in
Gilbert, Ariz. These companies manufacture water mist systems for putting
out fires and for other purposes, such as outdoor cooling and industrial
humidification.
 
"Firefighters in Denver and at the Arvada Fire Training and Research
Center
have tested our ultra-fine mist nozzles," said Mike Lemche, general
manager
of MicroCool. "The cooling effect of this mist removes one of the key
components of fire - heat." 
 
Gary Wintering, president of Fogco, said his company will use information
from the STS-107 experiment to fine-tune their designs of fire-fighting
systems. Water mist systems create a fog instead of sending out blasts of
water. Since the fog removes heat and replaces oxygen as the water
evaporates, it prevents the fire from expanding and starting new fires.
 
This is particularly important when fire starts in a closed compartment
on a
ship, aircraft, or even on the Space Shuttle. The U.S. Navy is already
working with the airline industry and The Center for Commercial
Applications
of Combustion in Space on water mists studies.
 
"With halon replacements expected to be an important part of the
$2-billion-a-year fire suppression industry, it is easy to understand why
companies are flying this experiment," said Dr. Frank Schowengerdt,
director
of The Center for Commercial Applications of Combustion in Space. "These
companies are testing the system in space because it's easier to observe
the
interaction between a flame and water when Earth's gravity does not cause
air currents around the flame and does not cause water droplets to
settle."
 
Prior combustion experiments have shown that space is the ideal place to
study the physics of fire. On Earth, gravity causes lighter, hotter air
to
rise -- creating air currents that make it difficult to study combustion
processes. In microgravity -- the low-gravity inside the Shuttle orbiting
Earth - air currents are reduced or eliminated, making it easier for
scientists to observe exactly how water interacts with a flame to put it
out. 
 
"The Shuttle experiment will help us determine the optimum water
concentration and water droplet size needed to suppress fires," said
Abbud-Madrid. "We have learned from short tests on NASA's KC-135
reduced-gravity aircraft and inside drop towers that water mists take
one-tenth the water of traditional sprinklers to extinguish a flame."
 
More extensive measurements in periods of microgravity longer than a few
minutes will be possible during the Space Shuttle Columbia's16-day
mission.
A mixture of propane and air will ignite inside a clear tube to produce a
thin flame -- known as a laminar flame. On the opposite end of the tube,
a
water mist will be released. Digital images will record how different
size
water droplets and water concentrations affect the flame.
 
The experiment will take place inside the safety of the Combustion Module
--
a NASA facility flown on a previous Shuttle flight. It was developed by
NASA's Glenn Research Center in Cleveland, Ohio, and is the forerunner of
a
similar facility under development for the International Space Station.
Future water mist investigations on the Space Station will be larger and
longer, enabling companies to test different water injection systems,
droplet sizes and fire scenarios.
 
 
-end-
 

 

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