WHY DO WE
NEED TO SAVE
ENERGY?
Without
Energy
No Life
EARTH
is a finite
system
Nothing is created,
Nothing is destroyed
Everything is transformed
World's proven oil reserves are
1200 billion barrels
Source : BP Statistical Review of World Energy 2007
+
600 billion barrels
to extract from tar sands
in Canada and Venezuela
The world consumption of oil…
…continues to growth
Million Barrels of Oil a Day
3,0 90
Annual Consumption
88
2,5
Annual growth
Rest of
the 86
2,0 World 84
1,5 82
USA 80
1,0 78
0,5 China 76
74
0,0
72
-0,5 70
2000 2001 2002 2003 2004 2005 2006 2007 2008
With a world oil consumption
growth of 1% per year …
But…
Remember! The only
thing that we have to
fear, it is that the sky
might fall on our
heads!
… and precisely
In 200 years, we will have
released in the atmosphere,
the carbon that took nature
600 million years to trap
CO2
1850 1900 1950 2000
The sea level has risen 15 to 20 cm
over the 20th century and is going to rise
another 18 to 59 cm by the year 2100
6.5 billion in 2005
5 billion in 1987
The world 4 billion in 1975
population 3 billion in 1960
is increasing 2 billion in 1930
1 billion in 1800
250 million in 1
5 million
10 000 bef. JC 5 000 bef. JC 0 1000 2005
The world energy consumption is increasing
Rnv Energy
Nuclear
Natural gas
Oil
Millions of toe
Coal
90% of fossil energy
1 million tonnes oil equivalent = 11.6 MWh Source : IEA, Mai 2007
Energy cost is increasing
How many Earths do we need ?
In Chinese, "the word « crisis »
is made up of two letters.
One represents danger and the
other opportunity"
In only one day, the sun provides the
Earth with the same energy to that
consumed by humanity in 35 years
"With Concentrated Solar Power Stations,
one thousandth of the deserts surface
would be sufficient to cover
the world’s need in electricity"
Hans Müller-Steinhagen
Head of the Institute of Technical Thermodynamics
German Aerospace Center
These are the electric motors that consume
the most energy in the industry
9%
4%
Electrolysis
Lighting
Other uses 17%
Electric motors
70%
The purchase cost of a motor
is nothing in relation to
its cost of use
Purchase cost 2.5%
Maintenance cost 1.5%
Energy cost
96%
Global Cost of an electric motor
… and these are mainly the
frequency inverters that allow
... to reduce the energy invoice
while adapting the demand to the need
A centrifugal pump or
a fan is characterized by
A flow proportional to the speed
Qαv
Pressure Proportional
to the square speed
p α v²
Power proportional
to the cube speed
Pα v 3
p α v²
A centrifugal pump or fan working to its
nominal speed divided by 2,
so, to the half of the maximal flow
… has an energy consumption
divided by 8
30 up to 40% energy savings
can be realized for a centrifugal pump or a fan
With a frequency inverter
the working and service costs decrease
As of today,
the manufactures consuming
the most efficient electric energy …
… will be,
the most competitive
manufactures tomorrow
Now, you know
Thank You
for your attention
Philippe Châtel - Lenze