[Stoves] Energy requirements

[Ronal Larson]

Christa and list

	Something wrong below in last line.   1 kg biomass is approximately 18 MJ, which is exactly 5 kWh, not 1 kWh.  (1.2 kg would give 5.55 kWh.   Many sites on this conversion - such as https://www.convertunits.com/from/MJ/to/kwh <https://www.convertunits.com/from/MJ/to/kwh>.

	20% efficiency coming in somehow?

Ron



> On Oct 18, 2019, at 4:51 AM, Christa Roth (bioenergylist) <stoves at foodandfuel.info> wrote:
> 
> Dear Paul, 
> You have to define typical meals for each location/region, as eating habits are so diverse all over the world. You find the explanation how to arrive at ‚typical meals‘ in the protocols for controlled cooking tests, like the CCT 2.0 document on https://www.cleancookingalliance.org/technology-and-fuels/testing/protocols.html <https://www.cleancookingalliance.org/technology-and-fuels/testing/protocols.html>
>  
> 
> On page 2 of the documents you find: 
> The first step in conducting the CCT is to consult with people in the location where the stove or stoves are going to be introduced in order to choose an appropriate cooking task.
> This should be done well ahead of time, to ensure that sufficient food can be obtained to conduct all of the necessary tests.
> 
> If the stove is designed for home use, then the task should be a typical meal consisting of foods that are regularly eaten in the community. It may include one or more dishes, though foods requiring complicated preparations should be avoided in the interest of time. In addition to the type of food, the testers and community participants must also decide on the precise quantity of food that is best representative of a typical family’s meal. This is critical to ensure that tests are uniform."
> 
> On average across my travels around the world I keep coming across a similar order of magnitude of 1.1-1.3 kg of wood use per person per day, so I round it up to an easy-to-work-with, rule-of-thumb number of 1kWh per person per day for cooking. 
> 
> Hope this helps
> regards
> Christa (currently in Malawi)
> 
> 
> 
> Am 17.10.2019 um 21:22 schrieb Paul Arveson <outlook_32A675455D056F09 at outlook.com <mailto:outlook_32A675455D056F09 at outlook.com>>:
> 
> Dear experts:
> 
> You all know too much.  I am trying to separate the problem into parts.  For this part I don't care about what happens outside the pot.  I am only interested in the energy required to raise the temperature in the pot, and how long it needs to simmer to cook the food.   Crispin, the info about endothermic effects in some foods was relevant; thank you for this. 
>  
> I worked on the ISO standards, but I don't believe we ever defined something like a "standard meal" for the purpose of comparisons.  Any ideas on this?
>  
> Paul Arveson
> 
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