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| Stoves Archive for May 2002 |
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| 102 messages, last added Tue Nov 26 17:31:37 2002 |
[Date Index][Thread Index]
Re: Temperature dilution
>On Thu, 23 May 2002 10:58:12 -0500, "Paul S. Anderson"
><psanders@ilstu.edu> wrote:
>
> >
> >2. If the increase in available energy (because of using HOT air) exceeds
> >the energy requirement to blow the hot air, then the net gain is to be
> desired.
In reply, At 10:30 PM 5/24/02 +0100, AJH wrote:
>Too simplistic, you must build in a factor for the "utility" of the
>energy, a sort of heat opportunity cost. Electric energy for fans has
>a far higher opportunity cost than heat for cooking.
>
>AJH
Paul replies: I think I understand that and agree in the general
case. But the electric energy to operate a very small (perhaps 12 volt DC)
fan is SO SMALL, and in comparison, the heat energy from the burning of the
biomass is SO GREAT.
My original statement or implied question (above) is related to the GREAT
difference between the tiny bit of energy needed to do the blowing and the
(we hope) increase in energy from better burning of the biomass.
An extreme case would be to have a US$ 2 small fan with many months or
years of useful life and a 12-volt battery that is occasionally recharged,
which together make it possible to burn (in a gasifier or in some other
stove) some form of biomass that is otherwise literally waste product to be
thrown away. The heat is from the biomass. We are just trying to make it
possible to burn the biomass by providing a small fan.
Please note that my initial comment (at start of this message) was about
getting HOT air to be available via fans. But now the discussion by Andrew
and by me seems to be more "generic" about fans and their "opportunity
costs." I am interested in BOTH:
1. fans per se, and
2, the value of getting hot air into the combustion chamber.
Did this make more sense? I could easily be missing something.
Paul
Paul S. Anderson, Ph.D., Fulbright Prof. to Mozambique 8/99 - 7/00
Rotary University Teacher Grantee to Mozambique >10 mo of 2001-2003
Dept of Geography - Geology (Box 4400), Illinois State University
Normal, IL 61790-4400 Voice: 309-438-7360; FAX: 309-438-5310
E-mail: psanders@ilstu.edu - Internet items: www.ilstu.edu/~psanders
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