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<DIV><FONT face=Arial>Dear Bryce</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Thanks for the feedback.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>"Condensing" is simple in concept. Simply pass the steam
exhausted from the engine through a "condenser." :-) A "Condenser" is a heat
exchanger that is cooled with air or water, and it creates a vacuum, enabling
the piston to extract more work from the steam.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>For example, if the temperature of the water leaving the
condenser was about 140 F, the vacuum in the condenser would be about -12 psig,
and effectively, 50 psig steam would be as 'powerful" as 62.3 psig steam.
A problem with the Green steam engine could be that when the steam was expanded
enough to get the vacuum, there could be leakage of air in past the
O-rings, and a de-aerator would then be required to remove the air.
Additionally, you also need a boiler water feed pump, operating under vacuum, to
recover the water from vacuum of the condenser, and lift it up to boiler
pressure of 50 psig.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>They say, as you quote below: </FONT></DIV>
<DIV><FONT face=Arial>" <FONT face="Times New Roman">There are numerous
reasons that this design is considerably more efficient than standard historical
steam engines.</FONT>"</FONT></DIV>
<DIV><FONT face=Arial>There are also numerous reasons why condensing systems are
not used on small systems, two reasons of which are cost and
complexity.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Best wishes,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Kevin</FONT></DIV>
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style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=bnordgren@gmail.com href="mailto:bnordgren@gmail.com">Bryce L
Nordgren</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">Discussion of biomass cooking
stoves</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, May 15, 2013 12:48
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Stoves] Green Steam
Engine</DIV>
<DIV><BR></DIV><BR><BR>
<DIV class=gmail_quote>On Wed, May 15, 2013 at 9:25 AM, Kevin <SPAN
dir=ltr><<A href="mailto:kchisholm@ca.inter.net"
target=_blank>kchisholm@ca.inter.net</A>></SPAN> wrote:<BR>
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style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
class=gmail_quote><U></U>
<DIV bgcolor="#ffffff">
<DIV><FONT face=Arial>Dear Bryce</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I couldn't find his claim for 24% efficiency, but it
seems to be very high. I calculate that the useable energy in the
steam is less than 3%. </FONT></DIV></DIV></BLOCKQUOTE>
<DIV><BR>Yeah, for a website with only three pages, it sure needs work. The
claim is on the "Licensing" page. I wasn't trying to review his claims,
because that's a bit out of my niche. I just wanted to see where the provided
numbers took us. <BR><BR>The 24% figure was for recondensing the steam around
the boiler. I can't fathom how that works since the exhaust steam is at 1 atm.
How would the boiler be cold enough to recondense 1 atm steam to liquid if it
has to be hot enough to make steam at 4-9 atm?<BR><BR>Here's the snippet:
<BR><BR>
<P class=MsoNormal> When the steam is simply exhausted to
atmosphere while running a generator, for example, efficiency is relatively
low; in the area of 15%. When the exhaust is condensed and recycled back to
the boiler, the efficiency is around 24% to 30%. When the exhaust is condensed
through a heat exchanger whereby the condensation process is used fully by
heating water, space and distilling water, for example, the efficiency can be
in the 70% range.<BR><SPAN> </SPAN>In addition to the
potential for efficient energy use and production, the designs' simplicity,
economy and weight more than justifies its utilization. It is important to
note that utilizing free or cheap fuel makes efficiency less important. There
are numerous reasons that this design is considerably more efficient than
standard historical steam engines.</P><BR> </DIV></DIV>
<P>
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