Jed, I am confused. This guy is not the same as the other group, who got problems with thermocouples, is it?
2016-03-02 19:22 GMT-03:00 Jed Rothwell <[email protected]>: > [image: Boxbe] <https://www.boxbe.com/overview> This message is eligible > for Automatic Cleanup! ([email protected]) Add cleanup rule > <https://www.boxbe.com/popup?url=https%3A%2F%2Fwww.boxbe.com%2Fcleanup%3Ftoken%3DUY2L8vQlv0ND8MWyOfnJErNFUWplcF31WDnoVIoq5J0%252FMIc6%252Fr7%252BXI0gKe%252BdQqjAsMdK613kWWgchQuFmh2kiKpG5BZUrSdRmn8ERDwYpL4uZ4nG3dgXsI253ieaK5sD1McLE%252BvyDQGudEs2awR8Mw%253D%253D%26key%3D76ICtxyvu2T2agAj4GOEsDXMtQmMjmIddo1tXdPNGW4%253D&tc_serial=24582205029&tc_rand=1707815273&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001> > | More info > <http://blog.boxbe.com/general/boxbe-automatic-cleanup?tc_serial=24582205029&tc_rand=1707815273&utm_source=stf&utm_medium=email&utm_campaign=ANNO_CLEANUP_ADD&utm_content=001> > > I wrote: > > >> (6 bar = 0.6 MPa. This table shows hydrogen density at 1 MPa at 25°C is >> 0.8 kg/m^3. This is 0.034 kg, or 0.043 m^3 = 43 L) >> > > Oh wait. It gets a lot hotter than 25°C, doesn't it? Granted, the NIST > table and graph does not show pressure increasing much between 0°C and > 125°C. This graph does not go any higher. > > 1 MPa goes from 0.8085 kg/M^3 at 25°C down to 0.6061 kg/M^3 at 125°C. > > I wonder why the pressure does not increase in the graph from Zhang? Am I > missing something here? > > The pressure drops off starting at 1100, then increases, and drops off > again a couple of times. Someone suggested that is a leak which they are > refilling. This person thought the gas might be igniting, which causes the > excess heat. It would ignite in the vicinity of the outer wall > thermocouple, if it ignited anywhere. > > I thought this pressure fluctuation might be the nickel powder absorbing > and desorbing the gas, but I wouldn't know. The text does not mention > adding in new gas. > > - Jed > > > -- Daniel Rocha - RJ [email protected]
