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npts2020

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Everything posted by npts2020

  1. Firstly, without giving away top secret information, I can assure everyone all US nuclear powered carriers are propelled by steam turning a turbine which, through a system of reduction gears, turns the propeller, no electricity required. When cruising at even a fairly slow speed, those props use more steam than the electrical generators and all of the other steam systems aboard combined. Lastly, smart grid technology should help keep major sudden transients within manageable limits for most reactors. (I don't think we should be building more, though)
  2. Where does the power to turn the propeller for full speed ahead come from, then? The point is, the reactor I worked at aboard a carrier never seemed to have much problem with pretty wide power transitions in short periods of time.
  3. How, then, does a nuclear powered aircraft carrier go from all stop to full speed ahead in a short period of time?
  4. A typical method is to heat water in an insulated tank, then circulate the water through spaces where heating is desired. This can even be done with a passive solar system (you would definitely want back-up heating with that, tho)
  5. It sure looks like a keyway to me. The fact that it is a "staple" rather than just a bar could mean that it is held in place from the sides instead of the circumference. Do you know what it is from?
  6. I say language. It is what has facilitated the passing of all other inventions from generation to generation and allowed the communication of abstract ideas.
  7. One of those engineering problems swansont referred to is how much water you can expect to get from a given surface area. (keep in mind, the following is only approximations but will demonstrate the scale we are talking about) A good solar distiller will give you about a gallon per day per square meter of surface area. Compare that to a distilling unit on an aircraft carrier that produces about 100,000 gallons/day using waste steam from the propulsion system in a unit that measures about 3.5 meters square by 5 meters high. The comparable solar unit would have to cover around 10 hectares and 10
  8. I know this is a bit belated but a couple of comments; 1) AFAIK Nevada is the only state in the US to have a "none of these candidates" choice actually on the ballot. 2) There is something like 7 or 8 states that do not allow write-ins of any kind (doing so can invalidate your entire ballot in some places) 3) IMO "Democracy" in an ignorant society is simply mob rule (not going to argue about the efficacy or desirability of mob rule, tho)
  9. Isn't that kind of dependent on what the lattice is being used for? A spherical object loses less heat than any other shape (less surface area) but is difficult to make with a lattice. Seems to me, something in the shape of a buckyball (or if you want to be technical a buckminsterfullerene) would be the best for both strength and retarding heat transfer. https://en.wikipedia.org/wiki/Buckminsterfullerene
  10. If you could scale it up to the size required to propel a ship and if it was smaller/lighter than the current gearing systems onboard them (two giant if's), there is potentially a big market. On a steam powered ship, turbines run efficiently at several thousand rpm while the propellers they power are most efficient at low (typically 100-300) rpm so there is a giant cluster of reduction gears to slow turbine speed down to propeller speed.
  11. Thanks to everyone involved for this discussion. It demonstrates very clearly how even smart people will disagree on what "truth" is, even after facts are presented, in order to maintain a certain narrative. I wish I knew the solution to this but, sadly, do not. So far as finding middle ground with people who see a completely different reality from yourself goes, one may as well ask what is the middle ground between zero and infinity?
  12. I basically agree with this, Ed. One thing about enclosing the roadways is that it might be done with solar panels to power the whole system or homes and businesses.
  13. With today's technology, building rails of any kind will be a boondoggle when the entire transportation system is on the verge of being automated. I can see much of present day roadways being enclosed and restricted to automated vehicles only to enable speeds of 200+ mph (this will also eliminate problems due to weather). It would also be easier to power the transportation system with renewable energy sources, thus converting almost 1/4 of our energy use. How soon this might all happen is anyone's guess, inertia is sometimes difficult to overcome but I hope it is sooner rather than later.
  14. A large plurality of Americans are not represented in the US government. The largest number of voters *by far* are neither Republican nor Democrat. How many elected officials around the country are not Democrats or Republicans?
  15. According to Wikipedia's list of apocalyptic prophecies I have survived the end of the world at least 60 times. A few interesting predictions of the end of the world by (in)famous people; pope Sylvester II-Jan 1, 1000 pope Innocent III-1284 (666 years after the establishment of Islam) painter Sandro Botticelli-1504 Regiomontanus-1588 Martin Luther-1600 Christopher Columbus-1656 or 1658 mathematician John Napier-1688 then 1700 Cotton Mather-1697 then 1716 then again in 1736 mathematician Jacob Bernoulli-Apr 5, 1719 Emanuel Swedenborg-1757 John Wesley-1836 Jeane Dixon-Feb
  16. Four men are in a bar drinking and bragging about their families. As they come to discuss their sons, one has to use the bathroom and leaves the table. The other three continue the discussion, the first puffing his chest out with pride and telling how his son worked at an automaker and how he had gotten a bunch of patents to improve cars. He says, "In fact, he has made so much money off of his inventions that he bought his best friend a top of the line Mercedes for his birthday." The second man says, "Well, my son is also an engineer and works in the aerospace industry. He has made improvement
  17. It might also be mentioned that the less the Great Lakes freeze over, the more lake effect snow you can have. The colder the lake and the more it freezes, the less temperature differential (between water and atmosphere) and open water there will be for lake effect snow events.
  18. At least 15 states have open Presidential primaries and a couple others have semi-open primaries (like Massachusetts where independents can vote for anyone in the primary).
  19. Glad you brought this up. When it comes to nuclear power, you will need an entire salt truck for any cost estimates claimed. Since at least the mid-60's I know of no nuclear power plant built in the US at or under the cost projected when construction began and 2-3 times over budget is typical. The same is true of projected waste disposal costs and accident cleanup estimates are even worse. So far as the lifespan of solar panels, half of the ones Jimmy Carter put on the White House in 1979 (admittedly not PV but still saves on electricity for heating), are still in operation at Unity Colleg
  20. Note that only the VERY pro-nuclear Royal Academy of Engineering lists nuclear power as being competitive with fossil fuels. At present wind and solar about the same or slightly less than coal and natural gas and are continuing to go down in cost. How much are coal and natural gas likely to go down in cost over, say, the next 20 years?
  21. While this is true, it is just as true that the more renewables you have, the less need for coal or other fossil fuels. Again, as mentioned previously in this thread, storage can obviate the need for fossil fuel backup and there are many ways of storing energy besides batteries. Without going into a discussion of the relative merits of nuclear power vs other sources, I can definitively say that attributing higher prices in electricity to abandonment of nuclear power in favor of renewables is not likely to stand up to scrutiny. The price of nuclear power has consistently increased ever since it
  22. How much the consumer pays for electricity is not an indication of how much it costs to generate said electricity. Last year, when German consumers were paying high prices for their power, Germany had one of the lowest production costs in Europe (substantially lower than France with all of its nukes). Here is an article with a good explanation of the reasons for this. http://cleantechnica.com/2014/05/27/german-electricity-prices/ Even more importantly than price, German per capita CO2 emissions have gone down, especially when compared to the 1990's when the push for renewables began in earnes
  23. Teflon may work as suggested by Sensei but it might be impossible to reuse much of the equipment some resins and epoxies are mixed in. The best solution might be to have a disposable tip and design the applicator to mix components at the tip as they are being pumped out, thereby keeping them from hardening in the equipment being used. It will be interesting to see what you finally come up with.
  24. My favorite 70's band nobody ever heard of, Klaatu. The guitar work in this song is pretty amazing.
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