Hi Jones: Without going into all the details, your calculations are in line with the language-translated Parkhomov information. At the point of estimating the corrected pressure due to heating, he simply multiplies the 50 bar/atmosphere pressure by 2, to obtain 100 atmospheres. I’m not sure where you obtained the 900 °K value for the temperature, but all current estimates are that the internal temperature for the Parkhomov Cell is no more than about 1000 °C (probably lower than this), based on where his thermocouple was located. His plots approach 1300 °C where he was measuring at...
... Crunching through all the possible numbers, I get a top end of 3425psi using all the “extreme” values. Since the MFMP DogBone has Stainless Steel extension on it, the volume has now increased and I would be making a wild guess at the added volume, but I would say 30% more (perhaps Bob H./MFMP can give us some more accurate estimate)? I believe Parkhomov is assuming [virtual] loss/leaking of H2 when obtaining his factor of 2 pressure increase with temperature (and perhaps it has something to do with the equilibrium conditions that will be obtained when the 2LiH <> 2Li + H2 reversible reaction occurs at the temperatures/pressures involved. But this is all pure speculation on my part, since there are no remarks that I can find. Please note that Parkhomov had no way of knowing the actual pressures, since he did not measure them, as far as I know... ... He does refer to “> 850 °C” for the above reversible reaction, but I believe he obtained this value from the Boiling Point of LiH (850 °C) at Standard Pressure. Actually LiH starts to decompose before it boils (according to some literature), so for anyone to mention the Boiling Point of LiH (as I have just did), is highly questionable. Other sources say that decomposition occurs from 900 – 1000 °C, with no solid reference that I can find to back it up... ... I have about 5 references here concerning all this, and will try to post them when I get more time... - Mark Jurich From: Jones Beene Sent: Saturday, January 03, 2015 9:40 AM To: [email protected] Subject: [Vo]:Right-on AGP Has anyone determined that the high internal pressure claimed by Parkhomov is even possible? Did he claim 500 psi? I cannot find the reference today, but the numbers are probably out there and at first glance – score one for AGP. Btw – in a search of Vortex, it turns out Parkhomov was mention by Rothwell way back in 2012: Author: Y. Bazhutov … A. Parkhomov et al, Year of Conference: 2012 Title: “Investigation of Radiation Effects at Loading Ni, Be and LaNi5 by Hydrogen”. Very appropriate. Just in case no one else has done it– here are back of envelope calcs – rounding off slightly: molar volume of hydrogen gas (assuming ideal gas at 1 atmosphere of pressure) is 24.5 liters (or dm3/mol) at 300 °K, and the weight of a mole is two grams, so this gives 12 cc/mg for H2 at one bar and ambient - or 36 cc/mg at 900 °K elevated temperature. The “fuel” of Parkhomov was said to be 1/10 gram of LiAlH4 which is about 10% by weight hydrogen. This means that the weight of hydrogen, if none escapes is about 10 milligrams at the start. This means that the expanded gas would occupy about ~120 cc at STP, if released from the hydride - correct? OK. The interior volume of the reactor appears to be about 2.4 cc. so cramming 120 cc into 2.4 means that would require about 50-1 ratio... or 50 bar BUT if the reactor and gas is at 900 °K, then 150 bar or 2,175 pounds per square inch is possible. So the bottom line is yes, even with slight diffusion into the alumina and no leaks, 500 psi is not only possible but on the low side. The important detail is what is the pressure at 10,20,30 hours and so on? Apologies if this has been covered, or is not accurate but a lot of folks seem to second-guessing AGP, at least on a few points, and there appears to be no problem on this one. As of now, in terms of “trustworthiness” of reported data, based on past work, openness, and freedom from an agenda which would cause one to fudge data or salt the ash to be tested - I would give AGP a much higher ranking than AR. Let’s hope we get isotope data. This reaction is nearing the level of understanding. Jones
