But if depositing on the walls how would you get the massive surface area required? 4µm powder has about 0.4m²/gram of surface area, and using approximate (Rossi) figures of 100kW/kg then a 10kW unit needs about 100g or 40m² of surface area. It also creates more problems with recycling/replacing the nickel if it is necessary.
I think simple buoyant convection and radiative heat transfer can do the job quite well with cheap and simple nano-powder. Much of the powder preparation work we hear about involves ball-milling oxides and then reducing them using hydrogen and vacuum heating cycles. Maybe refreshing the powder is as simple as oxidising it and then reducing it at elevated temperatures in hydrogen to remove some of the unwanted accumulated impurities and reset the crystalline structure of the Ni. Or maybe it does require the replacement of the powder to eliminate impurities, in which case large nickel plated substrates make the job a lot more expensive. On 25 January 2012 21:53, Chemical Engineer <cheme...@gmail.com> wrote: > Axil, > > I would agree that the best way to transfer heat is to > electroplate/co-deposit the Nickel/catalyst on the walls of the kernal/core. > > Does the Hydrogen need to be purified to monatomic across a membrane? > > From their Spec: > Atomic Hydrogen generation Method : Proprietary, embedded within > reactor’s structure > > Maybe for a regen you need to add fresh Hydrogen and get rid of the stale > stuff and just "dust" off the Nickel... > > > On Wed, Jan 25, 2012 at 2:49 PM, Axil Axil <janap...@gmail.com> wrote: > >> *http://renewable.50webs.com/fusion.html* >> >> *NEWS! * *Defkalion Green >> Technologies*<http://www.defkalion-energy.com/home>has >> *announced >> (1/23/2012)*<http://www.defkalion-energy.com/forum/viewtopic.php?f=4&t=926>that >> they are now welcoming third party testing of their LENR reactors. >> They expect to market nickel-hydrogen* *Low Energy Nuclear Reaction (LENR >> *) *reactors in 2012 after government safety certifications are issued. >> Defkalion claims their reactors produce up to 32 times input power and are >> capable of outputting steam at temperatures up to 414 degrees Celsius. >> Their *Hyperion Modules* can be linked together to produce up to 5 >> megawatts of heat, and larger models may only need nickel powder refueling >> every 34 months. Defkalion claims Hyperions are refueled in place without >> the need to uninstall modules while refueling. Nickel powder fuel is >> renewed in vacuum using Hyperion Recharge Units, a suitcase sized device >> developed by Defkalion. Defkalion says they have received interest in >> license agreements from 850 companies based in 60 different countries >> around the world. >> >> With special attention focused on the following info: >> >> Defkalion claims Hyperions are refueled in place without the need to >> uninstall modules while refueling. Nickel powder fuel is renewed in vacuum >> using Hyperion Recharge Units, a suitcase sized device developed by >> Defkalion. >> >> This tells me that the micro powder cannot be removed from the reaction >> vessel and an alternative rejuvenation method has been discovered to >> reactivate the spent powder to revive reactor performance. >> >> This is another indicator that DGT permanently affixes powder to the >> reactor heat transfer structure. >> >> The take away… >> >> I like this...Reviving the powder is good…DGT >> >> I don't like this...Replacing powder is bad,,,Rossi. >> > >
