When we first started with methane, we put some effort into using liquid
nitrogen to liquefy natural gas from our municipal supply. We found that
natural gas gets tarry as you cool it, and that it's easy to freeze it
unintentionally. When we froze it, we were done for the day.
-R
On Wed, Feb 14, 2018 at 8:53 AM Perry E. Metzger <perry@xxxxxxxxxxxx> wrote:
On Tue, 13 Feb 2018 16:34:14 -0800 "Doug Jones"
<dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "randome" for DMARC)
wrote:
Isothermal LOX and propane tanks allow the propane density to rise
to 728 kg/m3, approaching the density of kerosene with nearly the
Isp of methane. No fuel vapor boiloff makes for reduced fire
hazards, too.
I note that the gap between the boiling point of LOX and the melting
point of propane is quite narrow, less than 5 degrees C. Does this
cause any problems in practice? It certainly would mean you couldn't
use subcooled LOX for increased density.
Perry
--
Perry E. Metzger perry@xxxxxxxxxxxx