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Steam related discussions.
Re: Enginion Steam Engine Oil Free Cylinders - 1 year ago
Did I read/misread the piston is exposing superheater tubes on stroking? Just glanced at the data so maybe heavy weight on the mis. Cheers, Keithby kdc2 - SteamStuff
Re: Enginion Steam Engine Oil Free Cylinders - 1 year ago
That diagram shows and denotes 3 stages of reheat. Usually this corresponds with an expansion cycle as that is what is causing the temperature drop. (ie triple expansion)by kdc2 - SteamStuff
Re: Enginion Steam Engine Oil Free Cylinders - 1 year ago
There is a well known term other than dry or wet steam and that is supercritical.by kdc2 - SteamStuff
Re: Doble book by Jim Crank - 3 years ago
Seems I posted on this two weeks ago. it was over 10 years. I miss Jim.by kdc2 - SteamStuff
Re: Jim Crank - 5 years ago
oh gosh, very sad. He lived down the road from the shop. Let me know if anything is needed from a local. Tears...Keithby kdc2 - SteamStuff
Any Ali Sories? - 6 years ago
Kind of choked up following Mohammad Ali's funeral and couldn't help think about Berrien Springs. Many times before an upcoming Berrien Springs meet I would drool over making it out there and would look up the area on maps. Doesn't take long to spot Ali's place. Was wondering if anyone had any stories related to Ali and Berrien Springs? Maybe Tom even got some of Ali's ability to articulate coby kdc2 - Miscellaneous Technical
Re: Ofeldt boiler time - 7 years ago
TIG is good and purging id with same welding gas makes for really good welds, a must with stainless. Inside looks as good as outside.by kdc2 - SteamStuff
Re: to replace a diesel - 7 years ago
Thanks for the follow up Ken. At least it confirms we're on the same page of the same book. I liked your ORC write up in the bulletin too BTW. -Keithby kdc2 - SteamStuff
Re: to replace a diesel - 7 years ago
Thanks For the nice write Ken. Will take a few reads to fully digest. Delta P should be a factor in blowby, compounding allowing for a lower delta plus catching anything blown by. A model I have showing the profile of the single has significant pressure at TDC where it is at a disadvantage to create work. Good dyno runs should yield good figures to apply polytropic variables to build a better mby kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
Why the repetition?by kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
Jeremy, It has been indeed a long time in the works. I just reread one of your replies on Nov. something 2009. At the moment, the system is a receiverless compound, probably very close to what Bill was working on at the time too. Next is to really nail and understand the specifics of various forced polytropic processes and work with them. Really obvious to me how we superheat with isenthaby kdc2 - SteamStuff
Re: to replace a diesel - 7 years ago
frustrated Wrote: ------------------------------------------------------- > Mechanically speaking, > however, compounding by adding piston stages has > some serious liabilities. A couple notes on this, one main upside of compounding is that for the same work/expansion ratio, the piston's supporting components need to handle 3 times the load uncompounded. The counter to this is morby kdc2 - SteamStuff
Re: it is so quiet here... - 7 years ago
I'd sure like to make more noise Reuben. After seeing the path some steam energy company's have traveled, my feet need a thorough warming and am really reviewing my i's n t's. Takes money to build these things and I need more solid numbers to throw more into the build. A dyno'd 30% would liven me up a bit. My numbers show more 17% numbers are more likely. Need to prove that wrong. -Keithby kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
Interesting process. Seems very temperature dependent as volume heads toward infinite/vacuum vs liquid. I'm wondering if we are at 100% vapor, if dropping pressure superheats, at what point does compression condense the fluid vs adding heat to keep it from condensing? Jeremy, superheat can be gained by throttling, isenthalpic expansion. Temperature doesn't go up, just superheat deg. Shoot, I caby kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
Hi Zimirken, What did you base your 4 and 5 iteration pressure and entropy/enthalpy and density/vapor fraction steps on if I could please inquire? Thanks, Keithby kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
Does anyone recognize this format? Has a slight Ken signature to it, but I can't remember where I got it. Still am troubled a bit by thumbnails and such. Think something is broke. -Keithby kdc2 - SteamStuff
Re: Welcome to the new website. - 7 years ago
lohring Wrote: ------------------------------------------------------- > Scott Finegan Wrote: > -------------------------------------------------- > ----- > > Forum thumbnails of uploaded photos not > > displaying. > I have the same problem with the latest version of > Firefox. > > Lohring Miller Fixed Same here. Tried to enable "this site knoby kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
zimirken Wrote: > I suppose the > drop in pressure would cause the steam to > superheat, wouldn't it? That's right where/what I'm working through. It seems that I will be able to drop the pressure enough before exhaust to cause serious condensation. I do believe the exhaust event will tend to superheat. That is the balance to work through to make sure the hardware will support it anby kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
Hi Rolly, Would that be the same as saying the temperature in the vacuum condenser environment was 175°F, or how/where are you applying the 175 de-superheat nomenclature? -Keithby kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
Any ideas on how to treat a uniflow expander exhausting into a condenser? We have to assume a small pressure gradient remains between the cylinder and condenser. Would the basic assumption be to calculate the total volume at the assumed residual pressure and subtract the percentage the cylinder volume represents and use that mass? Zimirken, I did notice your point "D" referencing theby kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
Nice, that is a perfect check verification. Refining the process through saturation/quality conditions. Thanks. Guess back in 2011 I downloaded the us units version of Xsteam. Coming back slowly with better understanding.by kdc2 - SteamStuff
Re: Isentropic formula for expansion/compression - 7 years ago
Thanks zimirken. I've found an example using absolute Rankine, so not forced to SI units. (not a fan here, but can deal if needed) It also seems if using the rankine scale, psia and ft3 are my necessary units. Another question, it seems that the constant R has worked its way out of my target equations, so would my y stay the same? Basic units are Btu/lbm*R. Gosh I wish I had more confidenceby kdc2 - SteamStuff
Re: 20th Annual Cabin Fever Expo 2016 - 7 years ago
There are a lot of nice quality models there Rolly. I got an impression that there is a notch of "keeping up with the Joneses" simply due to the quantity and quality of them all. Maybe a couple exceptions that looked like they needed restoration. Would like to see video. How many of these models were operable or in operation? Thanks for posting, Keith.by kdc2 - SteamStuff
Isentropic formula for expansion/compression - 7 years ago
Hello all, I think this has been covered many times, but can someone help clarify if the following must be in absolute (°K) T2=T1(P1/P2) (1-1/y) y=Cp/Cv I got this from a nasa site and there isn't any reference to units Isentropic Compression. Wiki also doesn't list units on its Isentropic process page. What am I missing? Thank you, Keith Dby kdc2 - SteamStuff
Re: 1866 Dudgeon Steam Wagon - 7 years ago
From Wikipedia: "Roper was observed driving his steam carriage around Boston in 1863.[4]"by kdc2 - SteamStuff
Re: Ready to run steam car chassis - 7 years ago
Ah, could even be true here in California as I have friends with some. It's the darn pebbles I get concerned with, but rain certainly would make for interesting visuals. Wouldn't think open wheels would classify as anything safe however. We don't need no stinking motoryclists, pedestrians or bicyclists anyway (I have well over 300k mc miles (2 sideswipes might have turned out different with open wby kdc2 - SteamStuff
Re: Ready to run steam car chassis - 7 years ago
How the heck do they get away with open fenders for a street legal Kit Car?by kdc2 - SteamStuff
Re: White Paper - 7 years ago
My proto is as Ken describes, and I agree, blowing is much more efficient. There is an old saying that vacuum sucks. -Keithby kdc2 - SteamStuff
Re: Bulletin V29, N2 President Notes - 7 years ago
FWIW, my comment was on an earlier publication than the latest with the Doble Truck. But I'm wondering if I made a typo in N2...I can't find the bulletin to double check. The Doble truck bulletin is N6. -Keith Dby kdc2 - SteamStuff