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trønderen wrote: you make it sound as if this is something I've got ready to put into production Disappointed if you've not got a prototype running by now...
Bear in mind there's a lot more to boiling a liquid than just raising its temperature to boiling point - look up "latent heat" if not sure. Plus of course the boiling point rises with pressure; (why tea tastes awful up a mountain - the water's not hot enough). So the more pressure you want (to drive your turbine) the more heat you have to supply.
In terms of feed water (or whatever liquid you're returning to the boilers)... you could use a valve arrangement such that each tube in turn has a part at the top of the tube that can be isolated (you'd only need 1% - 2% of the total volume). Open that valve, and the condensate can literally just trickle in under gravity. Close the inlet valve, open the valve to the main boiler, and already the sudden increase in pressure on the newly-admitted liquid will significantly raise its temperature. Of course now instead of one moving part - the turbine fan - you have many. Valves and camshafts and control systems, and apart from anything else, these all introduce losses into the system.
Another feature to consider is super-heat - a technique where you pass the high-pressure steam back through the boiler which further dries it and adds additional energy. Once again, technology from steam railway locomotive design, that can make a huge difference to performance, especially if you have "spare" heat to provide - which you do, since you can add extra tubes at relatively low cost and with free solar energy to power them.
Regarding the turbine - there HAS to be significant pressure drop across it, otherwise you're not taking out any energy. The whole objective, really, is to maximise that pressure drop (and condensing your steam/vapour in the process is the best way to reduce the volume, and thus pressure).
Overall, though, my doubts are around getting a high enough rate of heating + evaporation to do anything more than light a single LED.
That said, your idea (or a version of it) has already been generating hundreds of megawatts out in the Mojave desert, for many years. But the site takes up hundreds of acres, with a vast array of parabolic reflectors concentrating sunlight onto a boiling vessel that generates steam to power a conventional turbine. In fact I answered a question on Quora about this only a couple of days ago: Quora[^]
You could certainly scale it down, but this installation suggests that you will need to collect a lot more sunlight than your lenses could do.
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You might like to research the Gas Powered Refrigerator. Not "gasoline", but many decades ago (5 or 6 or so), domestic refrigerators that ran on town gas (produced from coal) were available; and much to my amazement, at least here in the UK, they are still available for campers and caravanners.
And of course if nothing else, a refrigerator is a heat pump!
So in principle, an air-to-whatever heat pump should be possible. But as ever, the devil will be in the detail, and most likely the killer will be efficiency. Can you get sufficient quality heat from your thermal collectors as the energy source to replace the gas flame? I have no idea, I'm an electrical engineer.
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BarrRobot wrote: but many decades ago (5 or 6 or so)
Not even new then
The History of the Propane Refrigerator[^]
Choosing a Recreational Vehicle is all about deciding whether to power it with electric or propane. Electric means you need to have an external outlet which usually means a campground with a hook up.
Propane can power everything that electric does. Plus provide a hook up for an external propane grill.
I would be surprised however if you can't get both in one vehicle.
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So it seems to be impossible to create an automation task on the iPhone for certain events unless you manually allow the task to run.
I can automatically send a text message to Phil every day at 4am saying "Wake up, you filthy monkey!", but can't automatically turn on airplane mode when I arrive home. The second one asks me whether to run it and there's no option to disable this. Defeats the purpose of having a stupid automation in the first place. (I don't want to do any of these, just examples)
If you look at all the events that don't allow automatic execution, all are something that are a "security risk" in the sense that you can use them to blow things up remotely. Or something similar.
Am I imagining things or is someone at Apple super paranoid?
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Nope, you're not alone. I work with a guy that has a race tracking app on Android and Apple. In Android, he has a timer and every time the timer goes off, Android gets the GPS, does some math and goes back to sleep. This is great for battery life. On Apple, this isn't possible. The OS will trigger a GPS event when the device has moved an undisclosed amount and the app can receive the update. This means that the OS is sampling GPS fairly often to decide when to kick off the event. Its the best that Apple offers...
Hogan
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Indivara wrote: Am I imagining things or is someone at Apple super paranoid?
You'd think it's your phone, you can do whatever you want with it, right?
People complain when Windows doesn't let them do something they want (or does something they don't want it to), as if it's now Microsoft's computer, not theirs.
iPhones were never theirs to begin with.
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#Worldle #634 2/6 (100%)
🟩🟩🟩🟩⬜↖️
🟩🟩🟩🟩🟩🎉
https://worldle.teuteuf.fr
no map needed
"A little time, a little trouble, your better day"
Badfinger
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Had my Covid booster this morning and my immune system is clearly overreacting. Every bone hurts, my sats are in the low 90's, and I'm freezing: my hands are shaking and my teeth are chattering despite it being 21C in here.
I do hope this doesn't last too long ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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I checked last week and they weren't available in this area yet.
After reading your post I'm not sure I want to go with this round.
We and the SO had all our shots, boosters and we still got it.
Hope you get over it quickly.
I don't think before I open my mouth, I like to be as surprised a everyone else.
PartsBin an Electronics Part Organizer - Release Version 1.3.0 JaxCoder.com
Latest Article: SimpleWizardUpdate
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Mike Hankey wrote: We and the SO had all our shots, boosters and we still got it. Never had a booster. Got the rona. It was rough, but since then I've stopped doing everything I used to in regards to masking, washing hands 30 times a day, worrying, etc. Never had a problem since getting it and it's been a year. It's almost like antibodies work.
Jeremy Falcon
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We travel a lot so we protect when out and about but at home we don't.
Oddly we picked up the rona on a trip Québec. Took us a month to get over it.
I don't think before I open my mouth, I like to be as surprised a everyone else.
PartsBin an Electronics Part Organizer - Release Version 1.3.0 JaxCoder.com
Latest Article: SimpleWizardUpdate
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Mike Hankey wrote: Took us a month to get over it. Glad you got through it ok. For me it was a rough two weeks. Either way, antibodies baby!
Jeremy Falcon
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Not as bad as you, but we both had more reaction to Pfizer boosters (#3, 4) than either of the original A-Z shots. Got over it in a day or so. She blamed it on having the fluvax at the same time, but I'm not convinced of that.
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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i had very sore upper arm more than usual though. couldn't sleep. lasted almost a week
"A little time, a little trouble, your better day"
Badfinger
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We are due for our fifth booster shots as well. I hope it deals more kindly with us.
About a month ago, my youngest daughter who lives with us, came down with Covid. She was coughing and wheezing all over the house and I was convinced we will both be infected, but we came through without so much as a sore throat. I am sure it was the vaccination and boosters that protected us! We will not miss these latest boosters.
Ok, I have had my coffee, so you can all come out now!
modified 17-Oct-23 18:54pm.
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Yes, get the boosters.
"A little time, a little trouble, your better day"
Badfinger
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I've got neck and back pain which I've not experienced before and a very sore arm which I have had before
Covid has certainly got it in for you though - hope it doesn't last long.
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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I have decided that at the age of 78 I am just as likely to die of Covid as anything else. I had my last booster back in May, and am declining all future offers.
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$20 says you'll live longer now.
Jeremy Falcon
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Longer than what (or who)?
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Longer than you otherwise would have. People that live the longest are generally happy. Folks that worry about everything tend not to be happy.
Jeremy Falcon
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But there is no "otherwise", we only live as long as we live. We can possibly keep alive into old age by good diet and keeping active, but equally some of the healthiest people can die quite young.
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You're missing the point dude. And there is an "otherwise"... for instance... let's say you thought about jumping off a cliff. And I'm no... don't. It's safe to say you'd live longer than you otherwise would've had you jumped off one.
Not sure why you're going to argue with me being nice. Guess you're bored or something. Might wanna look inward dude.
Jeremy Falcon
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