How high temperature carbon dioxide, heated by means of geothermal heat sources, can be an alternative energy technology.

1. NET WORTH OF GEOTHERMAL
POWER PRODUCTION FROM
SUPERCRITICAL CO2
THE POSSIBLE BENEFITS OF SUPERCRITICAL CARBON DIOXIDE AS A
REPLACEMENT TO STEAM IN GEOTHERMAL POWER PLANTS
BY WINSTON GRACE

2. Instead of water as the working
fluid for geothermal power
plants…..

3. …. high temperature carbon
dioxide (supercritical CO2 or
sCO2) is a possible working
fluid for generating electricity
by means of a turbine.

4. In terms of a valuation or net worth,
this technology brings several
advantages.
For example, it encourages the
application of carbon dioxide as an
actual key tool for alternative energy.

5. This gives an extra economic incentive for
carbon capture and sequestration (CCS).
In an sCO2 system, the carbon dioxide can loop
and remain at that geothermal location.
Each geothermal location could, in theory,
create demand for carbon dioxide removal from
the atmosphere or oceans (CCS).

6. By replacing water as the working fluid,
it both lowers demand for water and
avoids possible corrosion risk issues as
well.

7. Advantages to using sCO2
include the following:

8. Single Phase
As opposed to steam engines,
sCO2 functions in one phase.

9. Carbon dioxide is:
1. Non-explosive,
2. Non-flammable
3. Non-toxic
4. Thermally stable
5. and a readily available, low-cost chemical

10. 1. Twice as dense as steam.
2. Can allow for reduced turbine size at the power plants
3. Allow for smaller capital investment and operation cost.
Supercritical Carbon Dioxide sCO2 versus Steam
sCO2:

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