Beta

Slashdot: News for Nerds

×

Welcome to the Slashdot Beta site -- learn more here. Use the link in the footer or click here to return to the Classic version of Slashdot.

Thank you!

Before you choose to head back to the Classic look of the site, we'd appreciate it if you share your thoughts on the Beta; your feedback is what drives our ongoing development.

Beta is different and we value you taking the time to try it out. Please take a look at the changes we've made in Beta and  learn more about it. Thanks for reading, and for making the site better!

Comments

top

MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

catprog Re:3T gallons at a Superfund site with earthquakes (110 comments)

I am not saying to use that site. It is still an active mine . I am just using it as an example of the size of the hole needed.

(you may be able to halve the number by using the amount dug out to form a upper reservoir too)

The main problem with this method is of course the cost.

13 hours ago
top

MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

catprog Re:Ludinton pumped storage facility X 1,500,000 (110 comments)

And you have only flooded the US to 34m. Somehow I think the US is not 34m from it's lowest to highest.

yesterday
top

MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

catprog Re:Ludinton pumped storage facility X 1,500,000 (110 comments)

(We actually only need 3.28767123 × 10^14 BTU for daily storage)

Capacity of Bingham Canyon Mine = 3,220 billion gallons. (or 1.2 *10^10 m^3) (120 times more water)

Height 0.97 km ( Or an average of 5*100m) compared with an average of (1 .21* 100m) for Ludington (~5 times as much power for each L)

Using the calculations on pumped storage from wikipedia if you pumped water out of Bingham and let it flow back in.

1.2 *10^10 * 5 * .272 Kwh * 70% in BTU = 3.8980306 × 10^13 BTU / day (so probably 10 or so not 5)

(size in m^3) * (number of 50m height increments) * .272Kwh * 70%

using the same calculations for Ludington
8.36645409 × 10^10 BTU (Average fall of 120m)

(based on the local one here , it is 10 hours max output not 13 hours)

(And in your case the lower reservoir would be the ocean)

yesterday
top

MIT' Combines Carbon Foam and Graphite Flakes For Efficient Solar Steam Generati

catprog Re:Well, you COULD flood most of the country (110 comments)

Rough estimate

120 quadrillion BTU /year http://www.eia.gov/totalenergy...

using https://en.wikipedia.org/wiki/... 0.272 kWh per 1m^3 per 100m height

square root of (120 quadrillion btu / 365 / 70% / 0.272 kWh * 1 m^3 /100m) = 71km.

(or in other words 71km *71km *100m at a height of 100m from the lower lake will stall enough power for the average day.

Or to put it in perspective about 5 holes the size of Bingham Canyon Mine

yesterday
top

The Last Three Months Were the Hottest Quarter On Record

catprog Re:let me solve this right now (552 comments)

Even if coal is more expensive in Africa then solar once you include the building of the grid?

about a week ago
top

Blueprints For Taming the Climate Crisis

catprog Re:AGW is falsifiable, easily. (389 comments)

We also know from history that during those periods humans were not their. I.e those conditions are not good for humans.

about two weeks ago
top

Robert McMillen: What Everyone Gets Wrong In the Debate Over Net Neutrality

catprog Re:Net Neutrality is not about Peering (270 comments)

So the ISP is selling a service, then when people try to use the service as it was advertised it turns out they can't actually provide it.

about a month ago
top

Tesla Releases Electric Car Patents To the Public

catprog Keep the wall (211 comments)

I would of kept the wall as a demonstration of the patents now free.

about a month and a half ago
top

Why NASA's Budget "Victory" Is Anything But

catprog Re:Government fails again (267 comments)

The guy who had the tree and came home to find a group of other people pointing guns at him?

about a month and a half ago
top

Has the Ethanol Threat Manifested In the US?

catprog Re:Comment from a Chemist (432 comments)

From what I have seen sugar is much better for Ethanol in terms of EROI

about 2 months ago
top

Rising Sea Level Could Put East Coast Nuclear Plants At Risk

catprog Re:Except nobodies doing that (323 comments)

From your earlier comment "But it has limits in what percentage of our supply it can produce and not cause grid stability issues"

I have shown that it can get to 35% without causing those issues .

Is the cost for spinning reserve paid for by the current power stations

Assuming power demand has not increased and thus no new plants would need to be built normally.
(I.e Wind is replacing existing instead of instead of new)
The marginal cost of coal and gas appears to be 50-80 putting the wind about equal. (And for your spinning reserve well we have gas power that is no longer running due to wind)

about 2 months ago
top

Rising Sea Level Could Put East Coast Nuclear Plants At Risk

catprog Re:Except nobodies doing that (323 comments)

When you spread wind turbines out over a large area you also smooth out the variability.

The problem with allocating that cost to wind is that the other power plants do not pay for the spinning reserve.

My reading of the 6c/kwh is that includes transmission to the grid.

about 2 months ago
top

Rising Sea Level Could Put East Coast Nuclear Plants At Risk

catprog Re:Except nobodies doing that (323 comments)

As for the percentage limit

http://www.aweablog.org/blog/p...

with wind farms at one point providing 35.05 percent, or more than a third, of the system's power.

It's important to note that these new marks are being set without any utility system reliability problems, as system operators make use of their standard techniques for balancing supply and demand.

about 2 months ago
top

Rising Sea Level Could Put East Coast Nuclear Plants At Risk

catprog Re:Except nobodies doing that (323 comments)

You mean the same spinning reserve for large changes in demand such as the ad breaks in popular shows as people make a cup of coffee or in case a large power station has a problem and shuts down?

Integration impacts are not exclusive to wind and solar. Nearly all generators can impose costs on the power system or other generators when they are added to the power system.
These impacts are seldom calculated as integration costs and never applied to conventional generators as integration costs.
http://www.nrel.gov/docs/fy11o... (page 11)

about 2 months ago
top

Rising Sea Level Could Put East Coast Nuclear Plants At Risk

catprog Re:Except nobodies doing that (323 comments)

Or a broader option is to charge per CO2 emitted and use that money to reduce other taxes.

about 2 months ago
top

Rising Sea Level Could Put East Coast Nuclear Plants At Risk

catprog Re:Except nobodies doing that (323 comments)

So that needs to be considered in the for column for wind.

about 2 months ago
top

Rising Sea Level Could Put East Coast Nuclear Plants At Risk

catprog Re:Except nobodies doing that (323 comments)

And the benefit of dropping wholesale costs of electricity?

about 2 months ago
top

Rising Sea Level Could Put East Coast Nuclear Plants At Risk

catprog Re:Except nobodies doing that (323 comments)

Cost of nuclear station subsidy £96-£97 per megawatt hour
http://www.independent.co.uk/n...

Cost of wind
£100 per megawatt hour
http://www.telegraph.co.uk/ear...

Cost wise they are about the same.

  Currently in countries such as South Korea and China, typical construction times range from 4 to 6 years
https://www.oecd-nea.org/press...

Construction time is usually very short – a 10 MW wind farm can easily be built in two months. A larger 50 MW wind farm can be built in six months.
http://www.ewea.org/wind-energ...

Add in the time for planing etc and wind is faster.

about 2 months ago

Submissions

catprog hasn't submitted any stories.

Journals

catprog has no journal entries.

Slashdot Account

Need an Account?

Forgot your password?

Don't worry, we never post anything without your permission.

Submission Text Formatting Tips

We support a small subset of HTML, namely these tags:

  • b
  • i
  • p
  • br
  • a
  • ol
  • ul
  • li
  • dl
  • dt
  • dd
  • em
  • strong
  • tt
  • blockquote
  • div
  • quote
  • ecode

"ecode" can be used for code snippets, for example:

<ecode>    while(1) { do_something(); } </ecode>
Create a Slashdot Account

Loading...