On 23/07/13 12:02, dennis@home wrote:
On 23/07/2013 00:27, mcp wrote:
On Mon, 22 Jul 2013 23:47:06 +0100, "dennis@home"
wrote:

On 22/07/2013 23:34, mcp wrote:
On 22 Jul 2013 07:44:10 GMT, Terry Fields
wrote:

harry wrote:

http://en.wikipedia.org/wiki/Primary_energy

Look and see what primary energy is. Just look at the pie chart.

Under the 'Renewables' list 'Geothermal energy' is mentioned, and
links to another Wikipedia page.

Unfortunately, that page says right up front that

"Geothermal energy is thermal energy generated and stored in the
Earth. Thermal energy is the energy that determines the temperature
of matter. The geothermal energy of the Earth's crust originates from
the original formation of the planet (20%) and from radioactive decay
of minerals (80%)"

Since in the Primary Energy page 'natural uranium' is classed as
'non-renewable' and 'formation of the planet' won't happen again
(making it non-renewable also), do you get the impresson that there's
some wishful thinking going on here?

The radioactive decay of minerals will happen at the same rate whither
or not we use geothermal energy. If you burn uranium in a reactor you
will use it up making it non-renewable.

Its already non renewable.
there is no mechanism to renew it.

Our usage of geothermal energy is renewable, it is renewed by
radioactive decay. It's the same for other"renewables" e.g. solar.

So that would include gas, oil and nukes then as they are just as
renewable.


How much geothermal can you extract before you cause earthquakes or
other events due to the disturbance of heat flow in the crust?

Extraction of geothermal energy is intrinsically inneficient due to
the low thermal gradient. You could never extract enough to disturb
heat flow in the crust. You could cause small earthquakes similar to
fracking if you drill in the wrong place but that's true of any
process involving drilling.


That's not what happens in greenland where they extract heat.

I haven seen any volcanoes in bradford.


--
Ineptocracy

(in-ep-toc-ra-cy) €“ a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers.