On 31/12/2020 17:49, newshound wrote:
On 31/12/2020 17:35, ARW wrote:
On 31/12/2020 17:22, Andy Burns wrote:
Harry Bloomfield wrote:

David wrote:
I can see that you can buy an oxygen concentrator for around
£250-£300.

Just curious - anyone know how those things work? I have seen one
running, they sound rather like a small fridge compressor in
operation, but how do they work?

I didn't but wiki does ...

compressor pumps air through vessel that contains zeolite, which
adsorbs most of the N2, leaving output of mainly O2.* Then it swaps a
set of valves to continue the same process through a second vessel,
while reversing the flow through the first vessel to expel the N2 to
atmosphere, rinse and repeat.

Presumably they need good airflow into the room, and maybe an exhaust
for the N2 rich output?

I think if you look at flow rates and air changes even a well sealed
(ordinary) room would be OK.







(My late FIL was a builder, he had one for
a while for severe emphysema caused by asbestos and other dusts).


Hopefully the next generation of builders will not have to put up with
that if they pay attention now that asbestos awareness courses are
mandatory (and now exist).




During the first lockdown I fitted outside lights around the oxygen
plant at Doncaster Royal Infirmary.

The high usage was causing the pipes to freeze and they needed hot
hosing down every 2 hours.

I wonder if it is the same thing?


Not really. I don't know what sort of evaporators oxygen plant has,
whether it's just air source or whether they have heaters.

You have to supply enough heat to evaporate the amount of gas you are
using. Presumably the "standard" design just wasn't adequate at this
time of very high use.


I would agree, not designed for such very high use.


--
Adam