[Gasification] Fw: Underwater gasification?
GF
gfwhell at aol.com
Thu May 26 18:36:31 CDT 2011
Regarding the efficiency of Humphreys pump, there was considerable debate on this at the Royal institute in 1908.
It would seem that the Rankin and Carnot cycle diagrams were equated with this four stroke engine., in order to establish the efficiency.
However, the "extended power stroke" continued on to a negative pressure before completion, resulting in the temperature of the exhaust gasses being only slightly above the ambient. this had never been observed in an ICE as the exhaust temperature formed a considerable portion of the wasted energy of the fuel being burned.
In other words the force of the fuel exploding was totally used in the Humphrey pump.
GF.
-----Original Message-----
From: Rolf Uhle <energiesnaturals at gmx.de>
To: Discussion of biomass pyrolysis and gasification <gasification at lists.bioenergylists.org>
Sent: Thu, May 26, 2011 12:43 pm
Subject: Re: [Gasification] Fw: Underwater gasification?
But it must have a big volume of pressureproof vessel inside the hull.
nd if I calculate it right, the Humphrey pump delivers some 260
et kW. No idea how high it's efficiency is, shure not 100 %!
either how efficient a jet propulsion like this could be.
But even 260 kW are not much for a big ship with a huge vessel inside.
CE's compress the air much more and have a higher energy density.
ometimes beauty and virtue don't go the same way !
Rolf
Am Donnerstag, 26. Mai 2011 17:13:30 schrieb Henri Naths:
ps
I think the beauty of the a Humphrey-inspired water jet is that it would
have relatively no moving parts so it's weight to power ratio of
> efficiency is better than that of other engines overcoming the friction
losses of a conventional water jet engine (as per water ski) H.
----- Original Message -----
From: Henri Naths
To: Discussion of biomass pyrolysis and gasification
Sent: Thursday, May 26, 2011 8:57 AM
Subject: Re: [Gasification] Underwater gasification?
Hi Daniel,and list
< I don't think it would be an efficient means of low speed marine
propulsion though; it would suffer from low propulsive efficiency because
the jet velocity would be too high.> Have you considered the propulsion
end of a jet ski or a Jet Boat in your analysis . True the efficiency is
slightly lower than a straight prop boat but it is expelling a relatively
small stream of water at a high velocity. I hear what you are saying about
the jet engines but as I previously pointed out in a post , water has 700
times the density than that of air so you have to factor that in the
formula. Thanks
Henri
----- Original Message -----
From: Daniel Chisholm
To: Discussion of biomass pyrolysis and gasification
Sent: Sunday, May 22, 2011 5:51 PM
Subject: Re: [Gasification] Underwater gasification?
A Humphrey-inspired water jet is an interesting idea.
FWIW I don't think it would be an efficient means of low speed marine
propulsion though; it would suffer from low propulsive efficiency because
the jet velocity would be too high. The efficiency of a reaction engine
(which is something that generates thrust by accelerating and expelling
mass - a very broad category that includes not just jet and rocket engines
but also propellers on aircraft and ships) depends on the speed at which
the mass is expelled. Accelerating a small mass to a large speed, is not
as efficient as accelerating a larger mass to a lesser speed. If you look
at aircraft jet engines today (high bypass ratio turbofans) you will
notice that they are much larger in diameter than the jet engines of the
1950s (turbojets) - this is why.
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