Poul-Henning Kamp

Poul-Henning Kamp

  • Commented on A death in the Firm
    Balloons on Mars are a no-go. While gravity is only one third, atmospheric density is just one sixtieth of Earth's....
  • Commented on A death in the Firm
    "dig up the lawn to a depth of 2 metres" No, optimal depth whatever is "frost-free depth" in your geography. Ground-loop heating is really solar-heating, the geothermal contribution is insignificant (unless you live in Island)....
  • Commented on A death in the Firm
    "Or find a contractor to do it (I'm guessing > $1000)." Get a quote, it's probably not that bad. Last I needed a big hole (~4") I paid ~3€ per cm depth here in DK...
  • Commented on A death in the Firm
    "There's more to it than that though" Storing heat in salt generates a lot of buzz these days, but there are some formidable engineering challenges in scaling the technology up. While the numbers, as such, look good-ish, the relevant usable...
  • Commented on A death in the Firm
    "if the UK government ordered 28 million units" One "feature" of cheap heat-pump-units, is that they are noisy, and in dense built-up areas, that can become a really bad "drone" sound which will be impossible to escape outside or inside...
  • Commented on A death in the Firm
    "I would need to replace the entirety of the plumbing in my house" Yeah, old houses suck (a lot of energy). I was lucky with my previous house: The city council approved extending the district-heating to our road, and that's...
  • Commented on A death in the Firm
    I should add that there is a huge difference in COP depending on your heating surfaces, almost no matter what your heat-source is (except for electrical resistance heating.) In-floor heating is the most economical, being primarily Stefan-Bolzmann radiation heating, their...
  • Commented on A death in the Firm
    "As I understand it, the boiler fan is used primarily for start-up." No, the fan starts about 10 seconds before the burn and continues to run after then burn until the temperature difference in the heat-exchanger has equalized. Efficiency would...
  • Commented on A death in the Firm
    The exhaust is cooled in two or three steps: First and primarily by the functional water, second by the intake air, and possibly third by the intake gas. All the heat exchangers are counter-flow, this means that the fluegas from...
  • Commented on A death in the Firm
    I have heavily instrumented the energy in the entire house. We consistently get COP>4 for heating purposes and COP>3 for hot water....
  • Commented on A death in the Firm
    "Mine has a fan in the boiler, but the flue is just a length of pipe 15-20' long, of which the majority is plastic. The installation instructions even allow it to be installed horizontally, and there is no maximum length...
  • Commented on A death in the Firm
    "Secondly, the quoted efficiencies were all of the order of 125% which" That sounds utterly bogus, you would have to live on permafrost or be *really* bad at both thermo-dynamics and mechanics to get that low efficiency. Here in DK...
  • Commented on A death in the Firm
    "So - what type of urban planning (incl. housing) do you need to have in place in order to be ready for the next pandemic?" The main lesson seems to be that you want really good non-recirculenting ventilation where airborne...
  • Commented on A death in the Firm
    "got a $50,000 clean-up bill" If you forced me to sum up USA in three words, I think "Lack of proportions" is what I would settle for. I once saw the manager of our server-room/integration-facility don his kidney belt and...
  • Commented on A death in the Firm
    "Compare that with Provand's Lordship, about 30 minutes from here and built in 1471." My children are both dual US/DK citizens and baptised in a church where a lot of the stonework is from 1100s. The US side of the...
  • Commented on A death in the Firm
    "In much of the US you'll find 2 kinds of houses that are still standing after being built prior to 1950." Doesnt that vary a lot with geography ? My impression of the northeast was that a lot of buildings...
  • Commented on A death in the Firm
    "I'm sure I'm not the only person who's waiting for your explanation of how these systems break the second law of thermodynamics." They dont. They simply preheat the intake air, and if they are really good at it, the water-vapour...
  • Commented on A death in the Firm
    "I did read it. Multi-stage burners put out water hotter than the flue exit temp." They dont need to be multistage to do that, they just need to be condensing. However, there are significant blind angles in this area. Here...
  • Commented on Official Announcement: April Fools Day is Cancelled
    "You get herd immunity to something like covid when there is immunity in somewhere around 60% of the population." ... or maybe you dont. One very important parallel for Covid19 is the common cold, where at least four of the...
  • Commented on Covid on Mars
    It is painfully obvious that the major indication of not following sensible social distancing protocols is "Being a Real Man™". I think we can safely assume that it is sufficiently programmed into DNA that it will apply also on Mars....
  • Commented on What happens now?
    "For the non-techies, please elaborate, i.e., what does this mean?" It means that all the neonazis pictures, bragging, planning and general "conspiracy", including all the stuff they thought they had deleted, is now out in the open, tied directly to...
  • Commented on What happens now?
    So to return to the question asked, in the "I did not see that comming": Parler got hacked, bulk downloaded, and published right before the shutdown. As if that was enough for news, the entire operation sounds more and more...
  • Commented on What happens now?
    "In Danish the feminine and masculine grammatical gender ended up being merged into a common gender (during the Middle Ages) while the neuter continued." Or as we explain to foreigners: "We dont care what sex you have, we care /if/...
  • Commented on What happens now?
    I'm increasingly leaning on the "I have in my hand the signed and sealed 25th declaration, behave or ELSE!" hypothesis. 45½ Pence doesn't want to send it, because that would be "unchristian", but he finally had enough, and knows better...
  • Commented on What happens now?
    One detail I have not been able to find an answer to: "he way he passed a law giving Russian presidents [...]" Does that law explicitly say it only applies to *russian* presidents ?...
  • Commented on What happens now?
    "I find it incredible that anyone thinks that it could have been even an incompetently planned coup. It had NONE of the characteristics of one," 100% agree. Nobody, least of all Trump, thought that as a coup. Trump is "merely"...
  • Commented on What happens now?
    "He will do more, and worse, on or before Jan 20th." Absolutely, he is going to burn the shop down if he can. His speech to the facists was not because he expected they would improve anything, it was simply...
  • Commented on What happens now?
    "A possible solution would be to copy what Greece did after the collapse of the junta:" Sure, that is the only thing which possibly can work, which all but guarantees that it will not happen in USA. Remember, most of...
  • Commented on What happens now?
    There are a lot of corrupt politicians in USA, who will go very far to not prosecute *very* corrupt politicians, fearing that the line might be drawn with a loose hand, so that is not going to happen. I also...
  • Commented on Submarine coming through!
    "the US first amendment needs very careful re-examination, to say the least." It's more than speech. We need to encode in law, that if you want to retain your own human rights, including the right to speech, privacy and ultimately...
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