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1. 03:13 AM - Re: Pneumatic fill rates and calcs ()
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| Subject: | Re: Pneumatic fill rates and calcs |
Another variation on this is to look at it in energy transfer terms; where
volume (litres) x pressure (bar) = energy (hJ) [hectoJoules]
So the 2 litre paint bottle has 2 x 310 bar = 620 hJ of energy stored in it.
The 12 litre main tank @ 50 bar needs 12 x 50 = 600 hJ to fill it from
empty.
With 20 bar already in it then the 30 bar top-up energy need becomes 600 -
(12 x 20) = 360 hJ
Which the paint bottle can provide as long as its excess energy, over need,
is above the 50 bar remainder threshold i.e. 2 x 50 bar = 100 hJ
... with 620 - 360 = 260 hJ remaining in the paint bottle, that's greater
than the 100 hJ threshold, so the main tank can be filled to 50 bar (with
manual valve control at 50 bar).
If the same paint bottle was then required to re-fill the CJ main tank
(again from 20 bar) there would be insufficient energy remaining to achieve
50 bar overall ... as 360 hJ needed and only 260 hJ available in the paint
bottle.
So the achievable pressure (with both connected in equilibrium) would then
be 240 hJ main tank + 260 hJ paint bottle = 500 hJ / (12 litres + 2 litres)
= ~ 36 bar
Hope this helps (or maybe just confused everyone further!) ... Rob R
[. this may only go to the Yak-List email digest as my Matronics login is
defunct & I've waited several days for a new one to be approved]
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