[Stoves] Excess air

[rongretlarson at comcast.net]

Crispin and list: See below 

----- Original Message -----
From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com> 
To: "Stoves" <stoves at lists.bioenergylists.org> 
Sent: Wednesday, August 21, 2013 3:38:07 PM 
Subject: Re: [Stoves] Excess air 

Dear Ron 

It is not about scale, it is about wrong answers. I gave real life examples of what happens when conditions are not what a formula-writer expects. 
[RWL: Can you rem ind where th ose "real-life examples" are? 

EA is a calculated value. If the calculation is incorrect then there is a systematic error in the reported value which would mislead the tester. 
[RWL: In my world EA is much more a measured value. Who do you know in the stove world who has any idea what the airflow i s in th eir most detailed measu rements? I didn't see i t at the stove camp - calculated o r measured. I do know measured air flow is part of the few doctoral dissertations I have seen in this area. 

So we should use the correct formula. 
[RWL: I ag ree that one can get more deta iled in presenting measured combust ion eff ic ien cy. Requiring a prior computat i on on the fuel characteristics that go into an EA pred ict ion and then compar ison st ill seems like overkill - partly for scale reasons. But I will re-look at what you wrote if you tell me where to look. But I repeat, if you gave me the most per fect computat ion of an EA for any stove, I don't know how to use that data for improving the stove, except in a very general way. Too many interacti ons of too many parameters. I'm in favor of trusting measured values. ] 
That's all. 

Regards 
Crispin 
>From BB9900 

-----Original Message----- 
From: rongretlarson at comcast.net 
Sender: "Stoves" <stoves-bounces at lists.bioenergylists.org> 
Date: Wed, 21 Aug 2013 21:32:10 
To: Philip Lloyd<plloyd at mweb.co.za> 
Reply-To: Discussion of biomass cooking stoves 
<stoves at lists.bioenergylists.org> 
Cc: Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org> 
Subject: Re: [Stoves] Excess air 

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