tag:blogger.com,1999:blog-6156940350159100953.post6293856644647156929..comments2024-01-14T22:07:22.183-08:00Comments on Sustainable Energy - without the hot air: Challenged by CarbonDavid MacKay FRShttp://www.blogger.com/profile/08023079754784119955noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-6156940350159100953.post-64336277634463066402010-04-12T13:05:56.279-07:002010-04-12T13:05:56.279-07:00Mackay mentions the pulverization and dispersal of...Mackay mentions the pulverization and dispersal of alkaline earth orthosilicates -- Mg2SiO4, Ca2SiO4 -- in SEWTHA, section heading, as I recall, "The last thing we should think about", but if we are now talking about <em>compressed</em> carbon dioxide, it seems we aren't thinking about catalysing the stuff's spontaneous condensation at all.<br /><br />The products of the minerals' condensation of CO2 are silica and alkaline earth carbonate, a mixture that could make actual pyramids.<br /><br />(<em><a href="http://www.eagle.ca/~gcowan/" rel="nofollow">How fire can be domesticated</a></em>)GRLCowanhttps://www.blogger.com/profile/03894036301406557803noreply@blogger.comtag:blogger.com,1999:blog-6156940350159100953.post-11664829101637812692010-03-29T00:51:13.885-07:002010-03-29T00:51:13.885-07:00There are carbon thoughts gloomier that have to be...There are carbon thoughts gloomier that have to be thought about.The emissions that are affecting our health every day.<br /><br /><a href="http://www.mikesairconditioning.com/" rel="nofollow">new jersey dryer vent cleaning</a>mikesachttps://www.blogger.com/profile/12382785177136531244noreply@blogger.comtag:blogger.com,1999:blog-6156940350159100953.post-88189372835674350492009-11-16T04:13:36.132-08:002009-11-16T04:13:36.132-08:00My answer to the ‘CCS Con’ charge of Andrew Smith-...My answer to the ‘CCS Con’ charge of Andrew Smith-Gibbs is that we shall need carbon capture and storage from large coal-fired power stations to help us to manage the global transition to a low-carbon economy. The power sector is responsible for about 40% of global emissions and coal represents about 70% of emissions from the power sector. Considerations of price and energy security indicate that this dominance of coal is likely to continue for at least 20 years, even given the rapid progress on nuclear power and solar power urged by you, David.<br /><br />An industry similar in scale to the present-day oil industry could pump underground each day compressed carbon dioxide in volumes comparable to the c.80 million barrels daily production of oil (yes, we old explorers still use quaint measures for oil). That daily production of oil is accompanied by over 200 million barrels of water. Injecting carbon dioxide, in volumes comparable to that total flow of c.300 million barrels a day from present-day fields, could bury some 450 gigatonnes of carbon dioxide by mid-century. Reversal of flow of fossil carbon on that scale is clearly not going to happen in existing oil and gas fields, but those numbers give some indication of the scale of the contribution that could be made by storage in subsurface reservoirs.Bryan Lovellhttps://www.blogger.com/profile/14719773418658900539noreply@blogger.comtag:blogger.com,1999:blog-6156940350159100953.post-46505676721624077212009-11-12T14:04:32.194-08:002009-11-12T14:04:32.194-08:00David,
A nice little article you may like to loo...David, <br /><br />A nice little article you may like to look at some time. It attempts to exposed some of the myths in energy efficient buidlings. <br /><br />http://www.buildingscience.com/documents/insights/bsi-007-prioritizing-green2014it-s-the-energy-stupid<br /><br />I thought it might be useful to you in some way.Brian O' Hanlonhttps://www.blogger.com/profile/09185216066875647495noreply@blogger.comtag:blogger.com,1999:blog-6156940350159100953.post-53551585208058852622009-11-04T15:40:47.349-08:002009-11-04T15:40:47.349-08:00Andrew Kay --- Alas, no. Coal is about 60% carbon...Andrew Kay --- Alas, no. Coal is about 60% carbon but CO2 is only about 27% carbon. Furthermore, above a rather modest amount of CO2 (that amount for which the remaining coal has a sort of chemical affinity), the CO2 would be subject to leakage.David B. Bensonhttps://www.blogger.com/profile/02917182411282836875noreply@blogger.comtag:blogger.com,1999:blog-6156940350159100953.post-45680309534076581592009-11-04T06:01:30.086-08:002009-11-04T06:01:30.086-08:00I'm just curious to know if the compressed CO2...I'm just curious to know if the compressed CO2 from coal power would fit nicely in the coal mines from whence the coal came.Invisibuleshttps://www.blogger.com/profile/12899426647255109012noreply@blogger.comtag:blogger.com,1999:blog-6156940350159100953.post-10423490932243289912009-11-01T03:37:50.309-08:002009-11-01T03:37:50.309-08:00Yes, if CCS coal achieves emissions of 165g per kW...Yes, if CCS coal achieves emissions of 165g per kWh then that's definitely not going to be good enough for the climate targets.David MacKay FRShttps://www.blogger.com/profile/08023079754784119955noreply@blogger.comtag:blogger.com,1999:blog-6156940350159100953.post-67155164103943302812009-10-22T10:36:04.485-07:002009-10-22T10:36:04.485-07:00At net lifetime emissions of about 165g CO2e/kWh, ...At net lifetime emissions of <a href="http://dx.doi.org/10.1016/j.enpol.2007.09.026" rel="nofollow">about 165g CO2e/kWh</a>, I make 33GW of CCS coal equal to about 48MtCO2e per year, which really would get in the way of decarbonising the grid, wouldn't it? That is, if we take the 90% reductions target seriously, we'd have about 20MtCO2e/y left spare to meet the other 70-85% of our energy requirements, plus emissions from cement and agriculture. EPIC FAIL.<br /><br /><br />Not to mention all of the extra oil that would get burnt because the oil industry had persuaded government to use the CO2 for Enhanced Oil Recovery [EOR]. Funny how CCS proponents claim they get the carbon savings, but EOR claim the same carbon savings against their own emissions: but in the end, CCS means more carbon gets emitted into the atmosphere.<br /><br />So does CCS stand for Carbon Con for Suckers?Andrew Smith-Gibbshttps://www.blogger.com/profile/01673760413618810379noreply@blogger.comtag:blogger.com,1999:blog-6156940350159100953.post-12301094699967549052009-10-21T02:48:57.812-07:002009-10-21T02:48:57.812-07:00In your book you have a section on weird measures ...In your book you have a section on weird measures that we Engineers and Scientists hate, such as "households of electricity". Now you introduce Giza Pyramids of compressed carbon dioxide!<br /><br />What's the EU carbon tax in € / Giza Pyramid?Alex Terrellhttps://www.blogger.com/profile/11869459605386847493noreply@blogger.com