Axil, I agree about 5g in proportion, but the K&E report says: "The central container seen in figure 3 has an estimated volume of 50 cm3 and it contains 50 grams of nickel." I also thought about the powder density/porosity and chose a number close to the full density of nickel metal, as i imagined those pores would/could be filled with the hydrogen gas. If I use your suggestion of 3g/cc then the amount of hydrogen at 25atm will be 0.07g and the pressure will increase in a similar way: 25.05 293 20 26.75 313 40 28.46 333 60 30.17 353 80 31.88 373 100 36.16 423 150 40.43 473 200 44.71 523 250 48.98 573 300 57.53 673 400 66.08 773 500 74.62 873 600 83.17 973 700 108.81 1273 1000
On Wed, Apr 20, 2011 at 16:15, Axil Axil <janap...@gmail.com> wrote: > I question the amount of nickel used. The one liter (1000 cc) Cat-E used > 100 grams of catalyst. By proportion, a 50 cc volume should use only 5 grams > of catalyst. The density of the catalyst is too high. It should be about > 3g/cc since it is porous. > > > On Wed, Apr 20, 2011 at 5:33 AM, .:.gotjosh <ene...@begreen.nu> wrote: > >> I would love a copy of that doc... please do send one my way. >> >> i also made a calculation based on that line from the K&E report >> - surprisingly i got zero comments - although i consider it a very relevant >> issue... 25 atm at startup is much more at 500C... i would love it if >> someone could double check these calculations and perhaps include them in >> the details documents. >> >> using the estimate of 0.09 grams of hydrogen pressurized >> into a 50cc chamber with >> 5cc occupied by 50g of nickel (at 8.8g/cc) >> and 45cc unoccupied (for the hydrogen to fill) >> with a starting pressure of ~24atm at 20C >> the pressure will grow to ~64atm at 500C >> >> atm deg K deg C >> 24.22 293 20 >> 25.87 313 40 >> 27.53 333 60 >> 29.18 353 80 >> 30.83 373 100 >> 34.97 423 150 >> 39.10 473 200 >> 43.23 523 250 >> 47.36 573 300 >> 55.63 673 400 >> 63.90 773 500 >> 72.16 873 600 >> 80.43 973 700 >> 105.23 1273 1000 >> >> (are my calculations correct ? - >> >> https://spreadsheets.google.com/pub?hl=en_GB&hl=en_GB&key=0Aj441n89_v_VdHhXMHZ6MmlRWlh0RVJKYVBwd3B4amc&output=html >> ) >> >> >> (note: K&E say 0.11g hydrogen but they are ignoring the space that the >> nickel occupies - and the 50cc is an estimate anyway) >> >> On Wed, Apr 20, 2011 at 00:43, Jed Rothwell <jedrothw...@gmail.com>wrote: >> >>> Alan J Fletcher <a...@well.com> wrote: >>> >>>> >>>> That's from the K&E report : >>>> >>> >>> Thanks. >>> >>> - Jed >>> >>> >> >
