[Gasification] most thermally efficient gas driven heat engine ever built

[gfwhell at aol.com]

Bob 

Most of the inefficiency of an I.C. engine is waste heat.  
When the explosion occurs. maximum pressure is applied to the PISTON. which usually has a fixed stroke. The exploding gasses are expanding and the pressure is dropping as the piston moves toward Bottom Dead Center. 
Before the gasses have fully expanded, the piston has reached BDC and these gasses have to be discarded,  released to atmosphere by the exhaust valves. causing two thirds of the available expansive energy to be wasted. This happens more so, on modern "square engines" Where the width of the piston is the same as the stroke.
A long stroke engine is more fuel efficient but  far bulkier. The Humphrey engine is about as bulky as they come,  because the plumbing and water delivery system is included in its design.
The exploding gasses are not discarded when they reach atmospheric pressure. in fact the pressure dips below atmosphere within the ignition area
There for most of the energy released by exploding the fuel is used to propel the water piston. some heat must go into the piston and surrounding chamber,some of this is reclaimed on the compression stroke.
I found all of the information regarding the thermal performance on this pump, extremely interesting, Because the gas was generated on site and stored in a small gas holder, The fuel being anthracite, was carefully weighed before each test. 

How about working out how many miles you can get, out of a freshly slurped barrel of crude oil?

At the turn of the 19th century there were several patents preceding Humphries invention. intended for the propulsion of ships. providing a jet drive which dispenses with propellers and were reversible.

GF






























-----Original Message-----
From: Bob Stuart <bobstuart at sasktel.net>
To: Discussion of biomass pyrolysis and gasification <gasification at listserv.repp.org>
Sent: Sun, 12 Aug 2007 12:32 pm
Subject: Re: [Gasification] most thermally efficient gas driven heat engine ever built





n 11-Aug-07, at 10:47 PM, gfwhell at aol.com wrote:
>
 The engine performed with over 90% efficiency.

 How could this be?

 If you could French kiss the exhaust pipe of an internal combustion  
 engine running at full load without discomfort, you have found one.

 The Exhaust gas temperature was less than 100f

 If you could build a four stroke engine with a stroke long enough  
 to cause a partial vacuum at bottom dead center you might be on to  
 something.
  This is the website of the "preserved" engine in Australia:
 ttp://members.fortunecity.com/freeenergy2000/humphreypump.htmÂ
Perhaps the thing to do is to raise the cubic capacity and  
ompression radically, but close the intake valve very early, to keep  
he combustion charge and temperature the same.  How far down can we  
et exhaust gas temperature just by running on part throttle?
Best,
ob Stuart


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