F-GASES
Name: Mahmoud Itani
ID: 201600936
Instructor: Dr. Salwa Mahmoud
Abdul Rahman
What are F-Gases?
Fluorinated gases (F-gases) are man-made gases that can stay in the atmosphere
for centuries and contribute to a global greenhouse effect.
Examples on F-gases that I’ll be talking about:
CFCs
HCFCs
HFCs
CFCs and HCFCs
Chloroflourocarbons (and their close cousins HCFCs) are greenhouse gases
and ozone layer depleting substances.
HFCs
Hydroflourocarbons are strong greenhouse gases.
HFCs are not ozone-depleting and were developed as replacements for
CFCs.
Uses of CFCs, HCFCs, HFCs
Refrigerants
Aerosols
Automobile air conditioners
Story of CFCs
CFCs were
developed
Montreal
Protocol
1930s
Vienna
Convention
1985
1988
Kyoto
Protocol
1997
Solution?!
Natural refrigerants are naturally occurring, non-synthetic substances that can
be used as cooling agents in refrigerators and air conditioners. These
substances include hydrocarbons (propane, butane, and cyclopentane), CO2,
ammonia, water and air.
These are sometimes referred to as `the Gentle Five’, each with a different area
of application. Natural refrigerants are:
Ozone layer-friendly substances
Climate-friendly substances
Cost competitive
Other refrigeration and cooling techniques include thermo-acoustic and
Stirling Cycle, evaporative cooling technologies.
How
is CO2, whose emissions are killing the
earth, considered a good natural refrigerant?
same goes for ammonia — isn’t ammonia
toxic?
The
What
is the Global Warming Potential (GWP)
of F-gases and natural refrigerants?
Companies that are using
natural refrigerants: