So that is the target.
5 or 10 liters is not enough water for a bath, laundry,
kitchen clean up and hot tea for a family. I am thinking a stove that will
heat a 20 liter pot would be more practical. A 40 quart would be even better but
would probably be out of the price range.
And I wonder if a TLUD is the best stove for a water heater.
Aren't they one shot and then you have to reload. How about a stove that will
hold water hot for a long period with the ability to throw in
a few chunks of wood in every hour or so to maintain the
heat.
And dispensing is an issue to consider, probably just dipping
will be most practical.
Lanny
----- Original Message -----
Sent: Saturday, October 05, 2013 12:13
PM
Subject: Re: [Stoves] Water heating with
TLUDs
Dear Paul and All
You are correct re the kitchens.
So with the cat out of the bag, there will be a water heating category
separate from stoves and it is highly suited to TLUD's that require no
attention. I suggest the 5 to 10 litre capacity range - one does not need to
fill it of course.
Because I know it is quite possible to get a very high heat transfer
efficiency with a gas flame from biomass, the target performance will be high
to qualify for a subsidy. It will be subject to the usual system efficiency
calculation so if you want to make char it has to come out of energy
savings.
I view them as fuel, fire and forget systems. No interaction should
be required from the operator after ignition.
To share some ideas, think of it this way: to boil 5 litres of water
takes about 2 MJ of heat. At 50% system efficiency that takes about
250-300 g of fuel so that sets the combustion chamber size. it is going to
have to burn pretty much completely in about 15-20 minutes (rate of 1.2
kg/hr). If it makes a significant amount of char, say 15%, the HTE will have
to be higher and the fuel load larger.
You get the idea. I think if a skirt is used it can serve as a chimney
and it will speed the combustion rate which will improve the heat flux rate
(watts/cm^2) to boil faster.
Please give it some thought - how you would solves0 this design
problem.
Regards
Crispin
Sent from my BlackBerry®
PlayBook™
Nolbert at Awamu and to all Stovers
[And i am sending this to a few others who are not on the Stoves
Listserv. And sending it
to the Biochar List because it shows
a very good way to have a useful task (heating water) while using
TLUD
technology to make biochar.]
You received this whole message
from the Stoves Listserv, but I am emphasizing part of it.
Crispin wrote in reference to Indonesia:
It means about 70 of the whole population is using wood for heating water,
with a smaller fraction using it more and more as income decreases.
Cecil says kitchens are becoming divided into a clean
[ he
probably mistyped this and it meant to say "UNclean or rustic or 'outside'
(that I observed in India) "]
portion with wood and
dirty pots, and a clean side with LPG and clean pots. There is an
opportunity in the market for water-heating-only devices which are highly
suited to TLUD powering because the task is fixed and predictable, plus it
operates at full power all the time. Think of it as a biomass-powered
kettle.
THIS is an extremely important niche for Awamu and
for TLUDs everywhere. Just one highly common, frequent (maybe even
multiple times per day) and useful application (in this case water heating for
bathing or for boiling to drink) to provide sufficient market and demand for
introducing the TLUD technology to households and to schools. TLUD
convenience as pointed out by Crispin and the use of less expensive fuel could
turn the tide of acceptance in some communities.
We need to think of
"kitchens" or separate areas where the pots are black and that does not
matter.
Note that this is not just for boiling water for drinking,
which can be ANOTHER major utility of TLUD stoves.
Doc
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: [email protected]
Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
--------
Original Message --------
Dear Ron
> Anything more on wood prices in town would be helpful. And for anything
in large quantities.
> Any data on the main cooking fuels if not char? Propane, electricity,
etc. Much wood?
The study just finished is being compiled. Early indications are that a
rough split of 40% cooking primarily with wood, 40% cooking primarily with
(subsidised) LPG, 20% with kerosene and electricity.
Of the 40% using LPG, 70% are using wood to heat water.
Of the 40% using wood, over 70% are using LPG to some extent, even in places
quite far from a supply.
It means about 70 of the whole population is using wood for heating water,
with a smaller fraction using it more and more as income decreases.
Cecil says kitchens are becoming divided into a clean portion with wood and
dirty pots, and a clean side with LPG and clean pots. There is an
opportunity in the market for water-heating-only devices which are highly
suited to TLUD powering because the task is fixed and predictable, plus it
operates at full power all the time. Think of it as a biomass-powered
kettle.
Regards
Crispin
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