[Stoves] Suggested New test procedure for stoves (frank)

[Boll, Martin Dr.]

 Frank,

> I was unable to find the info from Chris Adams.
> 

[M:] 
I searched a lot and found it. Possibly you searched for "Adams" but his
name is "Adam". I have seen a graph from this test. It is very clear and
informs better/easier than the description of the test. Chris Adam will send
you certainly a copy of that graph, when you are interested.

Here the copy of Chris Adam's posting:

[Stoves] Proposal for a new Stove-Testing-Concept (BTF)
adam u partner scda1 at t-online.de 
Tue Mar 7 06:41:57 EST 2006 
•	Previous message: [Stoves] Re: Household and Institutional Stove CDM
methdology 
•	Next message: [Stoves] woodcutting: other proposal and some history 
•	Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] 
________________________________________
I want to make a proposal for a new Stove-Testing-Concept.

In a word: You use the size (it gives a number) of surface of the 
temperature curve as an indicator for the quality of the stove!
This number I call " BTF=boiling time factor "
I can draft a curve of the water temperature over time. And i take into 
account the surface of the temperature curve above 80°C. This is 
normally the temperature which is helpful for the cooking process.
The temperature is taken and noted every 5 Minutes. The test goes over 2 
hours. All the fuel is used during the first hour. That means after the 
second hours all the fuel is burned.
No need to search for left-over pieces charcoal.

What's the idea behind this stove testing method?
I worked with fuel saving stoves in 1982 and 1985. I always disliked the 
ARLINGTON STOVE TESTING Procedures from 1982 (Percentage heat utilized) 
because it means-
stopping the fire, weighting the charcoal, restarting the fire 
(continuing) the fire from new.
Especially for larger community stoves with bigger fire- I really found 
this method improper.

* The BTF procedure takes into account if the stove is a low-mass or a 
high mass stove.

* It takes into account if the stove heats up quickly

* It takes into account if the stoves keeps the heat after the fuel is 
burned. (Also the chimney quality/damper effectivity).

This is because no fuel is added after one hour. A quick drop of 
temperature (smaller surface on the monitoring paper, steeper dropping 
angle) indicates a not-so-good stove.

* If the temperature is kept for a while (larger surface and slower 
angle on the monitoring paper) this gives an indication for a good stove.

So once more:
1) The stove testing times goes over 2 phases: One hour of heating, one 
hour when no fuel added.
2) You start to make a quick fire and reach the boiling point quickly. 
Afterwards the fuel is evenly distributed for the remaining hour.
3) The amount of water boiled should always be the same (2 litres for 
regular stoves (or 4 litres for community stoves))
4) The fuel is taken by volume (e.g. an empty can of about 1,5 liter (or 
4 litres for community stoves)) but the weight is exactly noted.
5) The water evaporated is measured in case a "Percentage heat utilized" 
figure wants to be calculated.
However the objective of the BTF is not to evaporate water- but to heat 
up water quickly and to keep it up hot over an extended period in 
relation to little fuel used.
A fixed amount of water and fixed amount of fuel is used for all the 
different test.

Calculations:
There is no need to use integral calculations for finding the "surface 
above 80°C", simple use this formula: add up all "water temperature 
minus-80°C" every 5 minutes.

Sample, water temperature: 05min= 85°C, 10min=93°C, 15min=96°C, 
20min=96°C, 25min=97°C, 35min=97°C, 40min=97°C, 45min=97°C, 50min=97°C, 
55min=97°C, 60min=97°C, // 65min=97°C, 70min=93°C, 75min=90°C, 80min=85, 
85min =81°C,

BTF, Boiling time factor: 5+13+16+17+17+17+17+17+17+17+17+13+10+5+1 = 199

This number can give a universal classification for the quality of a 
stove in relation to other stoves.

(For instance also categories could be made, like we have them shown on 
labels on all new fridges which are sold in Europe. A= for best energy 
efficiency, B= for acceptable energy efficiency, C= for low energy 
efficiency).
regards Chris A.

-- 
- - - - - - - - - - - - - - - - - - - - - -

adam + partner
Appropriate Technologist + Industrial Designer

Bahnhofstr. 13
82467-GARMISCH
G E R M A N Y

Hy:  +49-(0)175-528 96 24
Fax: +49-(0)180-5060 3488 7969