[Gasification] Fw: Underwater gasification?

[Henri Naths]

definitely needs work...
H.
----- Original Message ----- 
From: "Rolf Uhle" <energiesnaturals at gmx.de>
To: "Discussion of biomass pyrolysis and gasification" 
<gasification at lists.bioenergylists.org>
Sent: Thursday, May 26, 2011 10:40 AM
Subject: Re: [Gasification] Fw: Underwater gasification?


>
>
> But it must have a big volume of pressureproof vessel inside the hull.
> And if I calculate it right, the Humphrey pump delivers some 260
> net kW. No idea how high it's efficiency is, shure not 100 %!
> Neither 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.
> ICE's compress the air much more and have a higher energy density.
> Sometimes 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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